Archive for July 2017

Driver Assistance Systems Gain Popularity on GM Models

Many new GM models have a number of driver assistance systems that work together to help avoid collisions or reduce vehicle damage. These systems do not replace the need for driver attention, but can assist in certain situations by braking the vehicle, maintain lane position, and warning of nearby vehicles, obstacles or pedestrians.


Here’s an overview of the some of the more common driver assistance systems available on new GM models. Refer to the appropriate Service Information for diagnostic and repair instructions.


Collision/Detection System Settings


Many of the driver assistance systems can be turned on/off or their operation can be customized through the Settings menus on the infotainment system. Available Settings menus are dependent on vehicle equipment. To view the settings on most vehicles, go to Settings > Vehicle > Collision/Detection Systems. (Fig. 1)


Fig. 1


Safety Alert Seat


The Safety Alert Seat provides a vibration in the driver’s seat cushion to alert the driver of potential hazards, based on the serial data messages received from the control modules of other driver assistance systems. Safety Alert Seat components include the seat memory control module and left and right haptic seat motors. The two motors are located on the left and right side of the seat cushion. Depending on the alert, either the left, right, or both motors will activate.


Safety Alert Seat vibrations or audible beeps may be selected instead in the Settings menu on the infotainment system.


Lane Change Alert with Side Blind Zone Alert


The Lane Change Alert/Side Blind Zone Alert system is designed to detect other vehicles in the side blind zone of a vehicle or rapidly approaching that area to provide a warning to the driver before making a lane change. An amber warning symbol is displayed on the left or right side mirror (Fig. 2) when a vehicle is detected and the symbol flashes if a turn signal is activated on the same side as the detected vehicle.


Fig. 2


The side object sensor modules, which are also used by the Rear Cross Traffic Alert system, are located on each side of the vehicle behind the rear fascia and are not directly visible from outside the vehicle. The sensors use radar to determine the presence of objects nearby.


Lane Keep Assist with Lane Departure Warning


There are two stages of warning/intervention for the driver to help avoid collisions due to unintentional lane departures. The first stage is the steering input provided by the Lane Keep Assist system if the vehicle approaches a detected lane marking without using a turn signal in that direction. It does not continuously steer the vehicle. The system uses a camera to detect lane markings between 37 mph (60 km/h) and 112 mph (180 km/h). When the system is available to assist, the Lane Keep Assist indicator on the instrument cluster is green and when the system is providing assist, the indicator is amber.


The second stage is a warning chime or haptic seat vibration (if equipped with a Safety Alert Seat) if the system detects that the vehicle will cross the lane marking despite the steering input. If a haptic seat vibration occurs, it is on the same side of the seat as the lane departure direction. The system will not assist or provide an alert if it detects that the driver is actively steering.


The Lane Departure Warning system, on vehicles not equipped with Lane Keep Assist, also may help avoid collisions due to unintentional lane departures, but it does not provide steering input. The system provides a warning if the vehicle is crossing a detected lane marking without using a turn signal in the lane departure direction.


The front view camera module detects lane markings. The electric power steering uses a torque sensor to detect driver inputs and relays that information to the front view camera module. The electric power steering is used to provide steering input based on the forward looking sensor outputs, such as lateral offset of the vehicle, relative yaw angle and time to line crossing. The system can be turned on or off by pressing the Lane Keep Assist button, usually located on the steering wheel (Fig. 3) or center of the instrument panel.


Fig. 3


Rear Cross Traffic Alert


To help enhance driver visibility when the vehicle is in Reverse, the Rear Cross Traffic Alert will warn of traffic approaching from either direction by displaying a red alert on either side of display screen of the Rear Vision Camera. There will also be an audible warning or seat vibration warning.


The side object sensor modules send out a serial data message to activate the warnings when an object is detected in the rear cross traffic zone. The system operates when vehicle speed is 6 mph (10 kph) or less and is designed to detect objects moving at speeds up to 22 mph (36 kph).


The system will only alert on objects of interest that pose a potential collision with the vehicle. It will not alert to stationary objects, such as signs or parked cars.


On many vehicles, the Rear Cross Traffic Alert system can be turned off with the Parking Assist button. If equipped, turning off Parking Assist and Rear Cross Traffic Alert will also turn off the Rear Automatic Braking system.


Forward Collision Alert


The Forward Collision Alert system may help to avoid or reduce the harm caused by a front-end collision. Forward Collision Alert is a warning system and does not apply the brakes.


The system uses the front view camera module to issues a warning to the driver when a potential collision risk exists. When the system detects a vehicle in the path ahead, the green Vehicle Ahead indicator is illuminated on the instrument cluster. When approaching a vehicle ahead too quickly, the system provides a red flashing alert on the windshield and rapidly beeps or provides a haptic warning (if equipped with the Safety Alert Seat). It also has a tailgating feature that illuminates the Vehicle Ahead indicator in amber if following another vehicle much too closely.


In addition, a page on the Driver Information Center Info menu on some vehicles shows the Following Distance, indicated in seconds, to the vehicle ahead. If no vehicle is detected, dashes are displayed. (Fig. 4)


Fig. 4


The front view camera module is located behind the windshield, looking out at the road ahead to detect vehicles directly ahead. The system detects vehicles within a distance of approximately 197 ft. (60 m) and operates at speeds above 5 mph (8 km/h). If the vehicle has Adaptive Cruise Control (ACC), it can detect vehicles to distances of approximately 360 ft. (110 m) and operates at all speeds.


The driver can select the warning gap time (the time between the vehicle and a detected vehicle), also called the alert sensitivity, used by the system by pressing the Following Gap/Forward Collision Alert button on the steering wheel. The timing can be set to Far, Medium, or Near.


The driver can select between audible or haptic alerts in the vehicle personalization menus. The Forward Collision Alert system can also be turned on or off through the vehicle personalization menus. Go to Settings > Vehicle > Collision/Detection Systems.


Forward/Reverse Automatic Braking


Forward Automatic Braking, which includes Intelligent Brake Assist, will detect a vehicle ahead that is traveling in the same direction that the vehicle may be about to crash into. It can provide a boost to braking or automatically brake the vehicle to help avoid or lessen the severity of a collision when driving in a forward gear. Depending on the situation, the vehicle may automatically brake moderately or hard. Forward Automatic Braking can only occur if a vehicle is detected, as shown by the Vehicle Ahead indicator being illuminated. The system works when driving in a forward gear between 5 mph (8 km/h) and 50 mph (80 km/h), or on vehicles with Adaptive Cruise Control, above 2 mph (4 km/h). It can detect vehicles up to approximately 197 ft. (60 m).


The system uses the active safety control module, vehicle direction camera, radar sensor module – long range, radar sensor module – short range left front, and radar sensor module – short range right front, to determine if an imminent collision risk exists.


The Reverse Automatic Braking system detects if the vehicle is backing too fast to avoid a collision and may automatically brake hard to a stop. In conjunction with the backing warning system, if the driver does not respond to the audible or haptic alerts while driving in Reverse, the system will automatically brake the vehicle to a stop.


Pressing the brake pedal after the vehicle comes to a stop will release Reverse Automatic Braking. It may be necessary to release the electronic parking brake. When it is safe to do so, pressing the accelerator pedal firmly at any time will override Reverse Automatic Braking.


Front Pedestrian Braking


The Front Pedestrian Braking system is designed to help avoid or reduce the harm caused by front-end crashes with nearby pedestrians when driving in a forward gear. It’s a feature subset of Forward Automatic Braking. No added components are required. The system displays an amber indicator when a nearby pedestrian is detected directly ahead. (Fig. 5) When approaching a detected pedestrian too quickly, it provides a red flashing alert on the windshield and rapidly beeps and provides a boost to braking or automatically brakes the vehicle.


Fig. 5


Front Pedestrian Braking can detect and alert to pedestrians in a forward gear at speeds between 5 mph (8 km/h) and 50 mph (80 km/h). During daytime driving, the system detects pedestrians up to a distance of approximately 40 m (131 ft.). Pedestrians must be at least 31.5 inches (80 cm) tall to be detected. During nighttime driving, system performance is very limited.


The Front Pedestrian Braking system can be set to Alert and Brake, Alert, or Off using the vehicle personalization menus. Go to Settings > Vehicle > Collision/Detection Systems.


For additional information, check out the latest Emerging Issues seminar. It includes a new series on Active Safety Systems.


TIP: For more information about GM Active Safety Systems, log in to GM GlobalConnect and, in a new tab, go to On the left side of the screen, select the Active Safety link.


– Thanks to Katul Patel


MDI Manager and Data Bus Diagnostic Tool Software Updates

New diagnostic software updates are now available or being rolled out to GM dealerships across the country.


MDI Manager


The new MDI Manager software includes updates for the future CAN FD protocol that is necessary for the next generation of GM vehicle architecture.


CAN FD (CAN with Flexible Data-Rate) is an extension to the original CAN bus protocol. It’s designed to make the Controller Area Network (CAN) faster, extending the useful data length from eight to 64 bytes for significantly higher data transmission rates.


The new software is being released through a staggered rollout to GM dealerships. The initial rollout included all GM dealerships in Michigan and Ohio. Additional dealers will be added every Monday, with completion of the rollout in October.


A user will be prompted to install the MDI/MDI 2 Manager software when clicking the SPS or GDS2 icon in TIS2Web. (Fig. 6) It is recommended to update all MDIs and Service computers at the same time to avoid incompatibility issues.


Fig. 6


Data Bus Diagnostic Tool


GM Customer Care & Aftersales also recently began distributing Data Bus Diagnostic Tool software update version 1.30.923 through TIS2Web. The update allows the tool to simultaneously monitor up to three dual-wire CAN busses as well as corrects some Device IDs. To download the software, click the GDS 2 icon on the TIS2Web home page.


Any questions about the software updates should be directed to the Techline Customer Support Center (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French).


– Thanks to Chris Henley

XT5 and Acadia Electrical Harness Conditions

Some 2017 XT5 and Acadia models may have several intermittent electrical conditions, including inoperative power door locks, inoperative power windows using the driver’s door controls, Retained Accessory Power (RAP) will not turn off the radio when the driver’s door is opened, or the engine will not turn off. There may be several DTCs set.


If these conditions are found, check the following areas on the driver’s side of the vehicle:

  • Missing lower A-pillar body-side plugs. There should be two body plugs, about 1-inch (2.54 cm) in diameter, in the door opening on the body side. Replace any body plugs that are missing.
  • Check that connector X500 of the driver’s door-to-body harness is fully seated on the inside of the lower A-pillar. (Fig. 7) If the connector is not seated properly, check for signs of corrosion. Water may collect in the bottom section of the connector if not fully seated.
  • Remove the interior kick panel on the driver’s side to check connector X200 on the inside of the lower A-pillar for any water intrusion. (Fig. 8)


Fig. 7


Fig. 8


There also may be a water concern with the HVAC drain hose, resulting in wet carpet on the passenger’s side floor. If the drain hose is plugged, water could spill over the splash shield and drip onto the Body Control Module (BCM), which can affect the operation of several electrical components and lead to a number of electrical conditions, such as improperly operating turn signals, flashing hazard lights, and Driver Information Center messages.


Several DTCs also may set if the instrument panel body harness is rubbing on the left side of the steering column at the intermediate shaft connection, damaging the harness. (Fig. 9) Repair the harness as necessary. Move and secure the harness away from the intermediate shaft.


Fig. 9


– Thanks to Tom Burlingame

GR8 Battery Tester/Charger Software Update

The latest software update (EL-50313-40) for the EL-50313 Midtronics GR8 Battery Tester/Charger is now available for download. The software should be accessed through GM GlobalConnect from the Service Workbench selection of “Special Tools & Software Updates.”


The EL-50313 Battery Tester/Charger (Fig. 10) must be used in diagnosing battery replacements and maintaining batteries on new vehicles in dealership inventory. The tool generates a warranty code on a printed slip that captures critical information about the battery’s condition.


Fig. 10


The software release is free for GM dealerships and provides the following updates for the GR8 Battery Tester/Charger:

  • Allow for entry of Isuzu VIN format for medium-duty trucks.
  • Enable 8-digit entry for repair orders.
  • Reduces the maximum battery charge time to 90 minutes. The display on the GR8 will still show an estimated time of up to 3 hours and should be ignored. The tool will print out a short ticket with a maximum estimated time. The results ticket printed out will show the actual test/charge time on the Charge Time line.
  • Previous CCA entry is automatically cleared from memory to prevent an invalid test.
  • The font used for warranty code printouts makes it easier to distinguish between U and V, which has caused some confusion in the past.
  • Some menus have been shortened by removing unused selections.


Software Download


To download the software update from the GM Special Tools website:

  • Go to the Software Downloads menu on the home page
  • Select GR8 Battery Tester Software Update V4.9.5. (Fig. 11)


Fig. 11


The new version of software can be identified on the bottom of the printout slip with the last letter being P. The previous version ended in O.


Example of new printout:

Version: 192-675P


Example of previous printout:

Version: 192-675O


– Thanks to Chuck Berecz and Gary McCraw

Vibrations or Beeps? — Active Safety Seat Operation

The Active Safety Seat available on many 2013-2018 GM models provides a vibration, or haptic warning, in the driver’s seat cushion to alert the driver of the direction of potential hazards. It’s part of a growing collection of safety systems included on new GM models and works in conjunction with features such as Forward Collision Alert, Lane Departure Warning, Front Pedestrian Braking, Parking Assist, Rear Cross Traffic Alert and others.


The Active Safety Seat uses two haptic signal motors in the left and right side of the driver’s seat cushion to provide the vibration warning. Depending on the alert, either the left, right, or both motors will activate. (Fig. 12)


Fig. 12


The K40D Seat Memory Control Module (MSM) receives serial data messages from other modules and provides a voltage output to turn on the haptic signal motors. The Seat Memory Control Module will pulse the left, right, or both motors the number of pulses requested over serial data. The module monitors the circuits for open, short to ground, and short to voltage conditions and will set DTCs if a problem is detected.


Haptic Warnings


Depending on how a vehicle is equipped, it may have a number of active safety systems. Here’s the typical operation of the Active Safety Seat with some of the most popular safety systems:


  • Front and Rear Parking Assist – When an object is first detected, both motors will pulse twice. If a potential collision is detected, both motors will pulse five times.
  • Lane Departure Warning – When the vehicle crosses a lane marking, either the left or right motor will pulse three times, depending on the departure direction. The Lane Keep Assist feature, which provides steering input, does not activate the Active Safety Seat.
  • Forward Collision Alert – Both motors will pulse five times.
  • Rear Cross Traffic Alert – When backing up, if rear cross traffic is detected, either the left or right motor will pulse three times, depending on which side the traffic is detected.


Alert Type Setting


If there is a concern about the operation of the Active Safety Seat in various driving situations, the Alert Type setting should be checked in the vehicle personalization menu to ensure the seat haptic warning is turned on.


The driver can select to receive the Active Safety Seat haptic warning or audible alerts (beeps). The setting to turn the Active Safety Seat on/off can be found in the vehicle personalization menus using the infotainment controls. Go to Settings > Vehicle > Collision/Detection Systems > Alert Type. (Fig. 13)


Fig. 13


TIP: Check the Alert Type setting in the service lane with the customer before the vehicle is left with the service department.


System Diagnosis


Always check for any set DTCs (B172E – Driver Seat Cushion Left Rear Haptic Alert Motor Control Circuit;  B172F – Driver Seat Cushion Right Rear Haptic Alert Motor Control Circuit) when diagnosing the Active Safety Seat. Do not replace the haptic signal motors (Fig. 14) unless diagnosis clearly points toward the motors as the cause of the condition. If there aren’t any DTCs set, first check the Alert Type setting in the vehicle personalization menus.


Fig. 14


If the haptic signal motors are to be replaced, remove the driver’s seat cushion cover and pad to access the motors and electrical connectors.


Once the haptic signal motors are replaced, the Memory Seat Control Module should be cleared of any DTCs. It is not required to reflash or set up the module.


– Thanks to Daryl Funds



Volt and ELR with No Charge Condition Due to Loss of High Voltage Isolation

2011-2014 Chevrolet Volt and 2014 Cadillac ELR models may not charge and have DTC P0AA6 (Hybrid/EV Battery Voltage System Isolation Lost) set in the Hybrid/EV Powertrain Control Module 2 (HPCM2). These conditions may be caused by a loss of Hybrid/EV Battery Pack coolant or a loss of high voltage isolation within the battery. This is one of the most common issues seen on the first generation Voltec system.


The Volt and ELR have a high voltage isolation monitor feature where the Battery Energy Control Module (BECM) high voltage isolation monitor circuit tests the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The HPCM2 requests the BECM to perform the test.


If these conditions are present, the “Service Hybrid Battery Charging System” message may be displayed on the Driver Information Center, the charge status indicator on top of the instrument panel may be amber, and the Check Engine lamp may be illuminated.


In addition to DTC P0AA6, the following DTCs may be set:

  • DTC P1FFF (System Isolation / Coolant Level Sensor Fault – Hybrid/EV Battery Charging System Disabled) may be set in the HPCM2
  • DTC P1E00 (Hybrid/EV Powertrain Control Module 2 Requested MIL Illumination) may be set in the ECM.


DTC P0AA6 signals a loss of isolation detected within the battery pack itself. This is fundamentally different from the P1AF0, P1AF2, or P1E22 loss of isolation DTCs for the larger high voltage system.


DTC P1FFF is an umbrella code that prevents charging for many reasons, but it will always set with another DTC when codes are first read on a vehicle. DTC P1FFF by itself does not point to the issue that needs to be addressed.


DTC P1E00 is the HPCM2 request to the ECM to illuminate the Check Engine lamp.


Check the Coolant Level


Check for any loss of coolant by inspecting the coolant level in the underhood high voltage battery coolant reservoir. The coolant level should be between the top of the label (Fig. 15, #1) and the bottom of the low fill line (Fig. 15, #2).


Fig. 15


Also remove the drain plug for the battery pack (Fig. 16, #1) to see if any water/coolant drains out, indicating a coolant leak in the battery pack. Refer to PIC5920G for more information.


Fig. 16


TIP: If coolant is found inside the high voltage battery pack, the entire pack will need to be replaced. This is a very rare condition. Contact the GM Technical Assistance Center if any moisture is found during the drain plug inspection. The battery pack is currently on restriction.


Latest Calibrations


If a coolant leak is not observed, update the HPCM2 and BECM with the latest calibrations in TIS2Web. The revised calibrations are designed to improve the measurement accuracy of the internal loss of isolation DTC P0AA6. This is the more common repair for this DTC. The HPCM2 and the BECM work in conjunction to monitor and control the battery pack.


The BECM programming procedure is unique. It’s important to wait for service programming to fully complete with the checkered flag, as each of the four Battery Interface Control Modules (BICMs) are subsequently flashed once the status bar reaches 100%. Remain patient as this programming could take an additional ten minutes.


If DTC P1FFF does not clear after programming, attempt a secured high voltage code clear, as a function of the HPCM2.


The special labor operation listed in PIC5920G as well as normal programming updates for the HPCM2 and BECM are covered under the Voltec warranty period (8 years/100,000 miles, U.S., or 160,000 kilometers, Canada).


– Thanks to Lane Rezek



Service Know-How

10217.09V – Emerging Issues

September 14, 2017


The latest service topics from Brand Quality and Engineering are reviewed, including the first segment of a new series on Active Safety Systems (Fig. 17) and a look at Diesel Particulate Filter regeneration on new diesel engines.


Fig. 17


To view Emerging Issues seminars:

  • Log into
  • Enter Emerging Issues in the Search box.
  • Select the desired Emerging Issues seminar course title.
  • Click the Launch button.

2018 Camaro ZL1 1LE Performs on the Track

The new 2018 Camaro ZL1 1LE is the ultimate Camaro model for a day at a closed-course track event. (Fig. 1) The ZL1 1LE Extreme Track Performance Package features a racing-based suspension and aero technologies that make the most of the supercharged 6.2L V8 engine.


Fig. 1




The supercharged 6.2L V8 engine (RPO LT4) produces 650 horsepower and 650 lb.-ft. of torque. (Fig. 2) Power is boosted by the Eaton supercharger intercooler bricks sitting higher in the supercharger housing, improving efficiency, and the unique Tri-Y design of the exhaust manifolds, which improve torque production.


Fig. 2


The V8 engine is paired with the TREMEC 6060 6-speed manual transmission (RPO MH3), which is equipped with Active Rev Match (ARM). Active Rev Match aids in smoother shifting by matching engine speed to the next selected gear. The system is activated or deactivated by pressing either of the paddles marked REV MATCH on the steering wheel. (Fig. 3)


Fig. 3


To keep the demands of the track in check, the cooling system includes a high-performance radiator with dual auxiliary outboard radiators and standard engine oil, transmission and rear differential coolers. (Fig. 4)


Fig. 4




The ZL1 1LE was engineered for the track and has a curb weight that is 60 lbs. (27 kg) lighter than a standard ZL1 coupe, thanks to features such as lighter wheels and dampers, thinner glass in the rear window, and a fixed-back rear seat. Compared to the ZL1, approximately 60–70% of the chassis of the ZL1 1LE is different.


The Brembo® 6-piston fixed cast aluminum front calipers (Fig. 5) and 4-piston fixed cast aluminum rear calipers provide precise braking control while resisting fade. The two-piece front rotors cannot be refinished.


Fig. 5


The Electronic Limited-Slip Differential (eLSD) and the Performance Traction Management system help improve “turn in” response and corner exit speeds while the solid-mounted front and rear cradle mounts provide a faster response from the chassis to the driver, enhancing driver reaction to the road.


The front aero package and rear wing of the ZL1 1LE produces additional downforce for better traction. The front aero package includes a splitter, air deflectors and dive planes on the front fascia. While at the rear is a high-mounted carbon fiber double-sickle wing that produces 300 lbs. (136 kg) of downforce at 150 mph (241 km/h). (Fig. 6)


Fig. 6


Controlling all of that grip are the front and rear Multimatic DSSV® (Dynamic Suspension Spool Valve) dampers. (Fig. 7) The dampers have been calibrated for the car’s weight and tires. They are 23 lbs. (10.5 kg) lighter than the Magnetic Ride Control system on the ZL1.


Fig. 7


The ZL1 1LE features lightweight forged aluminum wheels fitted with Goodyear Eagle F1 Supercar 3R tires — 305/30ZR19 front and 325/30ZR19 rear — that deliver a maximum lateral grip of 1.10g. (Fig. 8) The wider wheels provide an overall footprint that is approximately 10 percent larger than the ZL1, but the wheel and tire package weighs about 3.3 lbs. (1.5 kg) less per corner.


Fig. 8


TIP: High performance summer tires have rubber compounds that lose flexibility and may develop surface cracks in the tread area at temperatures below 20°F (−7°C). Always store high performance summer tires indoors and at temperatures above 20°F (−7°C) when not in use.


Fixed-Back Rear Seat


The rear seat on the ZL1 1LE is a fixed seat in order to reduce weight. The seatback does not fold. If it’s necessary to remove the seatback, use a plastic trim tool between the seatback cushion and the rear window trim panel to release the latch from the seat frame. (Fig. 9)


Fig. 9


Optimizing Performance


The ZL1 1LE features several performance modes, set by the driver, that are designed to allow increased performance in a closed course track environment. Competitive Driving Mode, Performance Traction Management, and Launch Control can be accessed by pressing the Traction Control button twice quickly while in Sport or Track mode. Each mode regulates and optimizes the engine, brakes, and suspension performance while limiting the amount of electronic stability control intervention.


The Chevrolet Performance Data Recorder is available to record video, audio and real-time performance data of a driving session. The data is recorded onto an SD memory card. The SD card reader is below the instrument panel to the left of the steering wheel, just above the hood release lever.


Pre-Delivery Inspection


Some loose-shipped parts of the ZL1 1LE are to be installed by the customer. The following parts are to be installed during the Pre-Delivery Inspection (PDI) process:

  • Front air dam/deflector
  • Rear suspension control arm attachment kit
  • Front tire front air deflector kit (strake)
  • Front tire front air deflector kit (tire strips)


Refer to Bulletin #16-NA-369 for more information.


Hand Washing Only


The ZL1 1LE is not compatible with automatic car washes. It must be hand washed. Do not use any detergent, soap, or cleaners on the matte finish vinyl hood wrap.


For more information on the 2018 Camaro ZL1 1LE, refer to Bulletin #17-NA-251.


– Thanks to Sherman Dixon and Ann Briedis



Preparing a Camaro ZL1 1LE for a Track Event

The 2018 Camaro ZL1 1LE is designed for closed-course track events. (Fig. 10) But before hitting the race course, several preparations should be made in order to get the ZL1 1LE ready to perform in a competitive driving environment. Owners should be aware that these specifications are for the track only and should not be used during normal, everyday driving.


Fig. 10


TIP: High-performance features are intended for use only on closed tracks by experienced and qualified drivers and should not be used on public roads. High-speed driving, aggressive cornering, hard braking, and other high-performance driving actions can be dangerous.


Engine Oil


For track events and competitive driving, change the engine oil to MOBIL 1 15W-50. Do not use 0W-40 engine oil or another viscosity. After four hours of accumulative track use, change the engine oil. After a track event, change the oil back to the engine oil listed in the Owner’s Manual.


When checking the engine oil level, 30 minutes of run time is considered warm to make sure all oil drains back into the pan in order to get an accurate reading.


Brake Fluid


Brake fluid should be changed to DOT 4 fluid for a track event.


Rear Axle Fluid


The rear axle fluid must have accumulated 1,500 miles (2,414 km) of break-in before being used in track driving.


Front Struts


The front struts can be adjusted for track events. The original position is the street position. The front strut top mount can be turned 180 degrees for the track position, which provides additional negative camber.


In the track position, the TRACK CAMBER text will be visible and a second set of top mount holes will align with the strut tower holes. (Fig. 11) Verify and adjust the vehicle alignment per track alignment specifications to optimize vehicle performance for the track event.


Fig. 11


The front struts also have a threaded spring seat that allows adjustment of the preload on the front springs. The vehicle corner weights and front trim heights can be adjusted. The spring seat can be adjusted approximately 0.4 inch (10 mm) up or down from the nominal position. Each complete turn of the spring perch will change the vehicle height approximately 0.06 inch (1.4 mm).


Wheel Alignment


Track wheel alignment specifications are for a vehicle at curb weight conditions, meaning a full tank of fuel and zero ballast. Racing and competitive driving wheel alignment settings may cause excessive tire wear.


Verify and re-adjust the vehicle alignment as needed following the track event.


Rear Stabilizer Bar


The rear stabilizer bar ends have three attachment positions that allow the rear roll stiffness of the vehicle to be adjusted. (Fig. 12) The stabilizer bar stiffness increases approximately 15% using the rearward holes or decreases approximately 10% using the forward holes.


Fig. 12


Tire Pressure


Tire pressure specifications will vary based on driving style, track, temperature, and weather conditions. Limit the vehicle weight to a maximum of the driver and one passenger, with no additional cargo. The Driver Information Center on the instrument cluster can be used to show the current tire temperature status and tire pressures.


Before leaving the track event, reset tire pressures to the recommended inflation pressures on the Tire and Loading Information Label.


Underbody Air Deflector


The underbody air deflector tire dam kit (Fig. 13) provided with the ZL1 1LE reduces the amount of aerodynamic lift on the front axle for better handling on a closed course. The original tire dams must be reinstalled after a track event.


Fig. 13


Water Deflector


When operating the ZL1 1LE on a closed course in hot temperatures, remove the underhood water deflector to increase airflow and improve cooling. The deflector is secured by three bolts. Replace the water deflector immediately after track use to protect the engine compartment from water intrusion.


Safety Belt


The lap shoulder belt has an Automatic Locking Retractor feature, which is useful in performance driving when the driver wants to be held in the seat more tightly to take advantage of the aggressive bolstering of the seat. When the retractor lock is set, the belt can be tightened but not pulled out of the retractor. After locking the belt, adjusting the position of the seat allows for the safety belt to be tighter across the driver’s body.


For more information on the 2018 Camaro ZL1 1LE, refer to Bulletin #17-NA-251.


– Thanks to Sherman Dixon and Ann Briedis


PC Analyzer Tool Easily Checks Techline PC Specs

The GM Dealership Infrastructure Guidelines (DIG) and Dealership Security Guidelines (DSG) were recently updated with additional information to help dealerships in maintaining their overall IT infrastructure. The guidelines published provide a detailed specification of Good (minimum), Better (PCs purchased in the last year or two) and Best (refer to when purchasing new) for personal computers (PC) used in dealership service departments.


On September 1, the Techline Customer Support Center (TCSC) will enforce the standard practice that to receive support for the Techline applications (TIS2Web, GDS2, MDI/MDI 2, SI, etc.), the PC must meet or exceed the minimum required specifications.


The DIG document (U.S.) is available on the GM Dealer Services website.

In Canada, The DIG document is available in GM GlobalConnect under SUPPORT.


PC Analyzer Tool


To easily compare the specifications of PCs currently in use in the service department to the updated requirements, use the Techline PC Analyzer tool that is available from the Utility Tab in TIS2Web. This tool gathers all relevant specifications from the PC and presents them in a concise summary.


Once the PC Analyzer is installed on the PC, click the Techline System Analyzer icon on the desktop to run the application. It will provide a summary of the PC specs, including the Pass/Fail status of the PC system, hardware requirements, anti-virus software and other data. (Fig. 14)


Fig. 14


TCSC can assist with interpreting the results of the PCs in your dealership and what is needed to meet current requirements.


TIP: TCSC will support a technician owned computer if it meets the minimum specification or higher.


If you have any questions related to Dealership Infrastructure Guidelines, contact TCSC at 1-800-828-6860 (English) or 1-800-503-3222 (French).


– Thanks to Lisa Scott

New Special Tools Software Update Download Process

Some GM special service tools, such as the Active Fuel Injector Tester (AFIT) and Pico Scope NVH Tool, require occasional software updates in order to ensure the tool functions properly, offers the latest features, and is applicable to new GM models and systems.


The latest software updates for special service tools are available on the Home page of the special service tools website,


There are different download procedures for GM dealerships and aftermarket users.


Software Download


The software should be accessed through GM GlobalConnect from the Service Workbench selection of “Special Tools & Software Updates.” Accessing the software download through the link on GM GlobalConnect enables dealerships to acquire the download at no-charge since payment will be made through essential tools/parts account billing; if applicable.


Go directly to the Software Downloads page on the special service tools website. (Fig. 15) Search for the parent tool number for the hardware, not the software update number. For example, EL-50334-100A (Multimedia Interface Tester hardware), not the software item number, such as EL-50334-SW2. The software item number will not be found via keyword search.


Fig. 15


To download the update, click the software link listed for the hardware and follow the instructions.


Always refer to the Update Instructions found under the list of Support Documents for more information, if available. (Fig. 16) The Update Instructions cover the steps that should be taken before as well as during the update process to avoid any errors and properly update the tool.


Links to the user guides for the tools also are provided.


Fig. 16


– Thanks to Chuck Berecz

Viewing Emerging Issues Seminars on the new Center of Learning

The new GM Center of Learning (U.S.) — — offers users a number of ways to find and view training opportunities, including the familiar Emerging Issues seminars that are available online each month.


On the Home page, the new Center of Learning shows helpful information on your learning path, current classes and resources as well as the full online catalog and an easy to use search function.


Service technical users also are provided with more detailed information about their learning paths and progress.


Search and Browse


Search for courses by name, course number or keyword using the Search box. Use the filters on the left to narrow your search results. (Fig. 18) Click the tabs above the search results to view related learning paths and resource support materials.


Fig. 18


Select the Browse Catalog tab to browse the courses in the catalog. Click a category to view a list of courses related to that topic.


View Emerging Issues Seminars


After logging into the Center of Learning:

  • Enter “Emerging Issues” in the search box
  • Select the desired Emerging Issues seminar course title. The courses are listed alphabetically.
  • Click the Launch button


TechTube Videos


To view one of the informative TechTube videos, select the GM TechTube link at the bottom of the Home page. The short videos, which run about 10 minutes or less, offer quick and concise reviews of specific repair procedures.


– Thanks to Mike Sculthorpe

Service Know-How

10217.08V – Emerging Issues

August 10, 2017


The latest service topics from Brand Quality and Engineering are reviewed, including a review of proper lift and hoist maintenance (Fig. 19) and some tips on using the Data Bus Diagnostic Tool.


Fig. 19


To view Emerging Issues seminars:

  • Log in to
  • Select Resources > Video on Demand > GM STC > Search Videos; or
  • Select Catalog to search for the course number, and then select View > Take or Continue Course
  • [+]2017
  • [+]2016
  • [+]2015
  • [+]2014