Archive for February 2015

Forward Collision Alert Operation and Timing Settings

Forward Collision Alert

Fig 1


The Forward Collision Alert (FCA) system (RPO UEU) available on the 2013-2015 Equinox and Terrain is designed to help drivers avoid or reduce the harm caused by front-end crashes. When approaching a vehicle ahead too quickly, the FCA system provides a red flashing alert and rapidly beeps. (Fig. 2)


TIP: The FCA system is a warning system only and does not apply the brakes.


2015 GMC Terrain Denali

Fig 2


System Operation


The FCA system uses the following components:


• The Frontview Camera Module, mounted in front of the rearview mirror at the top of the windshield (Fig. 3), looks toward the roadway ahead to detect vehicles. It communicates with the instrument cluster to illuminate the indicators on the Vehicle Direction Display, the Driver Information Center (DIC) to display messages, and the infotainment system for audible alerts.


• The FCA switch on the steering wheel provides an input to the Frontview Camera Module to select between the four alert timing settings.


• The Vehicle Direction Display contains the alert indicators. The indicators are controlled by the instrument cluster via serial data messages from the Frontview Camera Module.


• The infotainment system controls the audible alert for the FCA system.


If there is an FCA system malfunction, DTC B1011 (System Disabled Information Stored Malfunction) may be set. Check the Frontview Camera Module disable history for more information about what affected the operation of the system.


F03 frontview camera module

Fig 3


Object Detection


The FCA system detects vehicles within a distance of approximately 197 feet (60 meters) and operates at speeds above 25 mph (40 km/h). The system provides the following warnings:


Vehicle Ahead – When a vehicle is detected by the Frontview Camera Module, the vehicle-ahead indicator (Fig. 4) will illuminate in green on the Vehicle Direction Display, which is located on top of the instrument panel. Some vehicles may not be detected on curves or hills, or if there are poor visibility conditions. The FCA system also will not detect another vehicle ahead until it is completely in the driving lane.


F04 FCA indicator R

Fig 4


Tailgating Alert – When following a detected vehicle ahead much too closely, the red collision alert indicator (Fig. 5) will stay illuminated continuously on the Vehicle Direction Display until the following distance is increased. Once the distance is increased, the green vehicle ahead indicator will illuminate again.


Collision Alert – When the vehicle approaches another detected vehicle too rapidly, the red collision alert indicator will flash on the vehicle direction display and sound several high-pitched beeps. When the collision alert indicator flashes, the hydraulic brake assist function may prepare for driver braking to occur more rapidly, which can cause a brief, mild deceleration of the vehicle. The driver should continue to apply the brake pedal as needed.


The hydraulic brake assist function is designed to support the driver in emergency braking situations. The Electronic Brake Control Module (EBCM) receives inputs from the brake pressure sensor. When the EBCM senses an emergency braking situation, it will actively increase the hydraulic brake pressure to a specific maximum by turning the pump motor on.


F05 FCA collision alert indicator

Fig 5


Conditions Affecting Operation


The FCA system may not detect a vehicle ahead if the Frontview Camera Module is blocked by dirt, snow, or ice, or if the windshield is damaged. In these cases, the vehicle ahead indicator will not be illuminated.


It may also not detect a vehicle on winding or hilly roads, or in driving conditions that can limit visibility, such as fog, rain, or snow.


Keep the windshield, headlamps, and FCA sensors clean and in good condition to help ensure proper operation.


TIP: The FCA system may provide unnecessary alerts for turning vehicles, vehicles in other lanes, objects that are not vehicles, or shadows. These alerts are normal operation and the vehicle does not need service.


Setting the Alert Timing


The alert timing of the FCA system can be changed or disabled using the FCA switch on the left side of the steering wheel. (Fig. 6)


Continuously press the Collision Alert button to set the FCA timing to Far, Medium, Near, or Off. The setting is displayed in the DIC on the instrument cluster.


The timing of the alert will vary based on vehicle speed. The faster the vehicle speed, the farther away the alert will occur.

 2013 GMC Terrain Denali Interior

Fig 6


– Thanks to Doug Daugherty and Michele Metz-Tippy

Fuel Gauge Does Not Read Full

The fuel gauge may not read full, instead only reading 7/8 full (Fig. 7), after filling the fuel tank on some 2013-2015 LaCrosse, Regal, XTS, and Malibu models. This condition may be caused by build variation of the fuel level sensor sending the incorrect fuel level value to the ECM. Depending on the model, a new fuel fill shutoff valve and/or fuel level sensor has been released to address the condition.


F07 IMAG0089

Fig 7


New Fuel Fill Shutoff Valve and Fuel Level Sensor


TIP: This repair is only for the following models that have a 15.8-gallon (60 L) fuel tank capacity. Refer to #PI1161A for more information.


On 2013 LaCrosse, Regal, and Malibu LT or LTZ eAssist models equipped with the 2.4L L4 engine (RPO LUK) and 2013 Malibu LS models equipped with the 2.5L L4 engine (RPO LCV), the fuel level sensor and shutoff valve should be replaced if the fuel gauge does not read full after filling the fuel tank.


The fuel level sensor kit is PN 13594132. The fuel sender shutoff valve is PN 23465079.


To unsnap the original shutoff valve, use a plastic trim stick to pry the tabs out. When replacing the shutoff valve, make sure the windows on the valve point outward. (Fig. 8) Do not lubricate the O-ring on the new shutoff valve.


F08 shutoff valve

Fig 8


New Fuel Level Sensor Only


TIP: This repair is only for the following models that have an 18.5-gallon (70 L) or 18.6-gallon (70.4 L) fuel tank capacity. Refer to #PI1401 for more information.


On the following front-wheel drive models: 2013-2015 LaCrosse and XTS models equipped with the 3.6L V6 engine (RPO LFX), Regal models equipped with the 2.0L L4 engine (RPO LHU, LTG) or 2.4L L4 engine (RPO LEA), and Malibu LT or LTZ models equipped with the 2.0L L4 engine (RPO LTG) or 2.5L L4 engine (RPO LKW), the fuel level sensor only should be replaced if the fuel gauge does not read full after filling the fuel tank.


The fuel level sensor kit is PN 13594132.


– Thanks to Dallas Walton and Christopher Crumb

Maximizing Heating Performance

In extremely cold ambient temperatures, the small displacement energy efficient engines — the 1.2L L4 engine (RPO LL0), 1.4L L4 engine (RPO LUJ, LUV) and 1.8L L4 engine (RPO 2H0, LUW, LWE) — available in the 2011-2015 Cruze, 2012-2015 Sonic, 2013-2015 Encore, Spark and Trax may not generate the amount of heat needed to warm the cabin as quickly as expected.


When compared to older, less efficient engines, these energy efficient engines may not generate the same amount of heat at idle or when driven a short distance under light engine load to reach normal engine coolant operating temperatures as indicated by the engine coolant temperature gauge, resulting in less heat from the heater outlet ducts early in a drive cycle.


For vehicles with manual heater controls or an automatic climate control system in manual mode, instruct owners, during extremely cold ambient temperatures, to set the fan speed on a medium setting instead of a high setting when the vehicle is warming up or during a remote start. (Fig. 9) This will result in warmer outlet temperatures sooner. When the blower is operated on a high speed with extremely low ambient temperatures, the heater core will pull more heat out of the coolant than the engine can produce at idle or low speed, which causes the engine and outlet temperature to be slower to warm up.


Automatic climate control is optimized for these settings only if the system is operated in Auto mode.


F09 climate controls 2

Fig 9


TIP: Owners should not set the manual climate control fan speed to a high setting before a remote start. This will extend the time needed to warm the cabin during a remote start.


Thermostat Check


If there is a concern regarding heater performance, check for any DTCs and follow the appropriate Service Information. If no DTCs are set, verify that the engine coolant in the radiator surge tank is at the correct level.


Do not replace the engine coolant thermostat unless a DTC is set that is related to the thermostat. The ECM monitors the thermostat each key cycle to ensure that it is operating within design parameters.


If there are no DTCs, the engine coolant level is correct and the thermostat is diagnosed as operating correctly, then a concern that the engine is slow to reach normal coolant operating temperatures should be considered as a normal operating condition.


– Thanks to Steve Bruder

UPDATE: New Door Latch Design

The door latch on the 2015 Colorado and Canyon features a new design that operates differently from the previous common GM design. This new latch design also is used on 2014 Silverado 1500 and Sierra 1500; 2015 Silverado and Sierra; 2014-2015 Impala and CTS Sedan; and 2013-2015 XTS and ATS.


On the previous generation door latch, a closed fork bolt would open when the outside door handle lever was pulled.


On the new generation door latch (Fig. 10), the closed fork bolt does not open freely when the outside door handle lever is pulled. Force must be applied to release the bolt. This new design provides enhanced sound quality when opening and closing.


F10 door latch

Fig 10


Technicians that close the latch when working on a vehicle to stop the door chime from sounding will need to open the latch manually before closing the door. Do not replace a door latch because the bolt does not spring open.


– Thanks to Scott Sorbie

Inoperative Rear Camera or Radio

On some 2014-2015 SRX models, the rear camera or radio may be inoperative. DTC B127B sym2B (Rearview Camera Input Signal Circuit Missing Reference) may be set in the Human Machine Interface (HMI) control module.


If this condition is present, disconnect the HMI X1 connector and then turn on the ignition. Verify that 12 volts is present at the HMI X1 connector, terminal 5, circuit 5986 (High Speed Wake-up). If voltage is present, continue with the appropriate Service Information diagnostics. If no voltage is present, inspect connector X205 (the instrument panel harness to the body harness, located in the passenger compartment under the carpet under the passenger seat) (Fig. 11) for possible terminal damage on circuit 5986 (terminal 19 of X205). (Fig. 12)


F11 X205

Fig 11


F12 PIN 19

Fig 12


– Thanks to Hassan Abdallah

Aftermarket Equipment Connected to Multi-Media/Auxiliary Ports during Diagnosis

When diagnosing any infotainment system conditions, including blank displays, flashing displays, error or update failed messages, the navigation map not loading, Bluetooth concerns or USB concerns, on some 2013-2015 ATS, CTS, SRX, and XTS models equipped with CUE infotainment systems; 2014-2015 Regal, LaCrosse, Canyon, Sierra, and Yukon models equipped with IntelliLink infotainment systems; and 2014-2015 Colorado, Corvette, Impala, Silverado, Suburban, and Tahoe models equipped with MyLink infotainment systems, check and remove any devices plugged into the USB ports, SD card slots, or 12-volt accessory ports. (Fig. 13)


F13 usb port

Fig 13


Any aftermarket equipment should be unplugged prior to diagnosing any infotainment conditions. SD cards that mount almost flush to the slot may be difficult to see.


Many vehicles also have a USB port that can only be accessed by raising or lowering the radio display/control assembly. (Fig. 14) Verify that there are no devices in the storage bins behind the display/control assemblies, if applicable.


F14 usb port behind screen

Fig 14


– Thanks to Hassan Abdallah

Interior Rattle Sound when Idling in Reverse or Drive

A rattle or buzz sound may be heard inside the passenger compartment while the vehicle is idling with the automatic transmission in Reverse or Drive on some 2012-2014 Camaros equipped with the 3.6L V6 engine (RPO LFX). This sound is more prevalent with the transmission in Reverse. When the transmission is shifted into Park or Neutral, the sound may no longer be heard.


Typically, the rattle or buzz sound can be heard more easily in the passenger compartment than outside the vehicle. The sound may seem to be coming from the steering column or the instrument panel cluster area.


If a rattle or buzz sound can be heard in the vehicle interior, inspect the LH engine mount. (Fig. 15)


F15 4052276

Fig 15


This mount is located below the driver-side exhaust (Fig. 16, #1) and the steering linkage (Fig. 16, #2) in the photo.


Although this condition is found more commonly in the LH mount, it is also possible to have this sound coming from the RH engine mount as well. Both engine mounts in the vehicle use the same part number.


F16 4052275

Fig 16


The sound is louder when the transmission is in Reverse due to the increased engine torque that is being transmitted through the mount. Depending on the severity of the condition, the sound may be reduced or eliminated entirely when the transmission is shifted into Drive.


Use the Chassis Ears tool or a piece of bulk spool heater hose to confirm the noise is coming from the LH engine mount. If a piece of hose is used, place one end of the hose on the engine mount. (Fig. 17) Listen through the end of the hose to confirm that the noise is coming from the engine mount.


F17 4052277

Fig 17


If the noise is not coming from the engine mount, continue with the appropriate Service Information diagnostics. If the noise is coming from the engine mount, the mount should be replaced with PN 92249010.


TIP: The new engine mount will not be a different or superseded part number, but it will be an improved design to eliminate the potential for this condition to occur.


– Thanks to Matt Bierlein

High-Pitched Sound in Auto 4WD

A high-pitched whine sound may be noticed when driving some 2014-2015 Silverado, Sierra; 2015 Suburban, Tahoe, Yukon models and Escalade models in Auto 4WD (RPO NQH or NP0). The sound is intermittent with no noticeable pattern.


The Transfer Case Control Module (TCCM) on these vehicles is located next to the accelerator pedal and is not covered by any close-out or hush panels. (Fig. 18) When the TCCM has to move the transfer case actuator motor, the higher current passing through the module causes an electronic buzz or whine within some of the capacitors in the module. Typically, this sound can be heard only with all accessories and the climate controls off and only when actuator movement is required.


The high-pitched whine sound does not indicate a concern with the module and should not be replaced to address this condition.


F18 tccm

Fig 18


– Thanks to Steve Schipansky

New Trax Added to Chevrolet’s 2015 U.S. Lineup

2015 Chevrolet Trax LTZ

Fig 1


The all-new 2015 Trax, now Chevrolet’s smallest SUV, offers the agility of a compact car with a 100.6-inch wheelbase, but with up to 48.4 cubic feet of cargo space in three trim levels: LS, LT and LTZ.


Here are some of the features of the newest 2015 Chevrolet.


1.4L 4-Cylinder Turbo


The only available engine is a turbocharged 1.4L 4-cylinder engine (RPO LUV) that features a cast iron block and an aluminum cylinder head. It has double overhead cams, variable valve timing and four valves per cylinder. (Fig. 2)


With a compression ratio of 9.5:1, the engine provides 138 hp at 4900 rpm and 148 lb-ft of torque between 1,850 and 4,900 rpm. The EPA-estimated fuel economy is 26 mpg city, 34 mpg highway (FWD) or 24 mpg city, 31 mpg highway (AWD). Regular unleaded fuel is recommended.


2012 Ecotec 1.4L I-4 VVT Turbo (LUV) for Chevrolet Sonic

Fig 2


All Trax models use an electronically-controlled, automatic overdrive 6-speed 6T40 transaxle with an electronically-controlled torque converter clutch.


RPO MH8 is used on the front-wheel drive (FWD) model and RPO MHB is used on the all-wheel drive (AWD) model. DEXRON®-VI automatic transmission fluid should be used in both transmissions.


The AWD system, available on all trim levels, provides extra traction and maneuverability. The automatically engaging system seamlessly splits torque between the front and rear wheels when required, for better traction and handling. When it isn’t needed, the AWD system automatically shifts into FWD to maximize efficiency.


Steering and Suspension


A MacPherson strut front suspension is used with coil-over springs, a direct-acting large stabilizer bar, and side-load-compensated front strut modules with a steel 6-point rigid attachment front cross member.


The rear suspension features a compound crank (torsion beam) design, with a double-wall, tubular V-shape beam profile and gas-charged twin-tube shocks that combines all the advantages of a conventional torsion beam axle, including minimal space requirements, with low weight and consistent camber control. Noise-damping urethane spring isolators dampen noise.


FWD and AWD models feature a rack-and-pinion gear (straight ratio) with a direct-acting, column-mounted electric power steering system that helps save fuel by drawing energy only when the steering wheel is turned.


The FWD Trax has antilock brakes (ABS) with front disc brakes with ventilated rotors and rear drum brakes. The AWD Trax has ABS with four-wheel disc brakes with ventilated front rotors and solid rear rotors.


Brake features include electronic brake force distribution as well as cornering brake control and brake assist. Electronic brake force distribution optimizes the distribution of force to each of the four wheels during braking while driving through turns, depending on the radius of the turn.


The StabiliTrak® electronic stability control system incorporates traction control and rollover mitigation features.


The body structure of the Trax forms a protective cage around the passenger compartment, with 66 percent of it composed of high-strength steels, including ultra-high-strength steel in strategic areas It also features a class-best 10 standard air bags. (Fig. 3)


2015 Chevrolet Trax Safety features

Fig 3


Wheel Options


The LS FWD model uses 16 x 6.5-inch steel wheels with wheel covers.


The LS AWD model and LT model use 16 x 6.5-inch aluminum wheels.


The LTZ model uses 18 x 7-inch aluminum wheels.


P205/70R16 ALS and P215/55R18 AL3 tires are used, depending on wheel size. (Fig. 4)


2015 Chevrolet Trax LTZ

Fig 4


The tire pressure monitor system (TPMS) uses radio and sensor technology to check tire pressure levels. The TPMS sensors monitor the air pressure in the tires and transmit tire pressure readings to a receiver located in the vehicle.


Infotainment Technology


Standard technology includes the Chevrolet MyLink™ infotainment system with a 7-inch (178 mm) diagonal color touch screen (Fig. 5), with a Rear Vision Camera (RVC) and 4G LTE with built-in Wi-Fi hotspot. 4G LTE with the built-in Wi-Fi hotspot enables the connection of up to seven multiple personal devices such as smartphones, laptops and tablets to high-speed wireless Internet. The hotspot is on whenever the vehicle is on and comes with a three-month/three gigabyte data trial (whichever comes first). The system includes Bluetooth streaming audio for music and select phone, as well as Pandora, TuneIn radio and Stitcher.


2015 Chevrolet Trax

Fig 5


Other infotainment features Siri® Eyes Free for iPhone® iOS 6, iOS 7 and iOS 8 users, which enables voice-controlled connectivity so customers can keep phones stored and their hands on the wheel.


The available BringGo app brings smartphone-enabled navigation that can be displayed on the large MyLink screen, and allows using the touch screen to control the navigation. (Fig. 6)

 F06 Trax Smartphone Link

Fig 6


Electrical Power Management


The vehicle has electrical power management that estimates the battery’s temperature and state-of-charge. Electrical power management adjusts the voltage for best performance and extended life of the battery. When the battery’s state-of-charge is low, the voltage is raised slightly to quickly bring the state-of-charge back up. When the state-of-charge is high, the voltage is lowered slightly to prevent overcharging. If the vehicle has a voltmeter gauge or a voltage display on the Driver Information Center (DIC), the driver may see the voltage move up or down. This is normal.


Electrical power management works to prevent excessive discharge of the battery. It does this by balancing the generator’s output and the vehicle’s electrical needs. It can increase engine idle speed to generate more power, whenever needed.


It can temporarily reduce the power demands of some accessories. Normally, these actions occur in steps or levels, without being noticeable. At the highest levels of corrective action, this action may be noticeable to the driver.


Special Tools


The following tools were released for the 2015 Trax:


• DT-50839 Transmission Adapter Plate Bushing Replacer

• DT-50840 Input Shaft Seal Installer

• DT-50937 Spline Protector-IDS Shaft Seal at Right Ext Housing

• DT-50985 IDS Excluder Seal Installation – into IDS Flange



– Thanks to Ange Girolamo

Identifying Aftermarket Calibrations before Warranty Repairs

When alterations to GM engine or transmission control module calibrations are made by owners, it may subject powertrain and driveline components (the engine, transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by GM. These unknown stresses have the potential to alter reliability, durability and emissions performance. GM is identifying an increasing number of engine, transmission and catalytic converter part failures due to non-GM aftermarket calibrations.


As a result, GM has adopted a policy that prevents any unauthorized warranty transaction submissions to any remaining warranty coverage to the powertrain and driveline components whenever the presence of a non-GM calibration is confirmed, even if the non-GM control module calibration is subsequently removed.


TIP: GM requires retrieving the calibration information and performing the calibration verification procedure whenever a hard part failure may have occurred on internal engine components before disassembly, repair or replacement of an engine assembly under warranty. It is also strongly recommended that the calibration verification procedure be performed whenever diagnostics indicate that transmission, transfer case, rear axle or catalytic converter replacement is needed.


If a non-GM calibration is found and verification has taken place through GM, the remaining powertrain and driveline warranty may be blocked and notated in Global Warranty Management (GWM) and the dealership will be notified. This block prevents any unauthorized warranty claim submission.


Verification Procedures


Refer to the following GM Bulletins for the procedures to identify the presence of non-GM/aftermarket calibrations.

Screen Shot 2015-02-05 at 3.53.41 PM

Screen Shots


Correct GM calibrations must be confirmed with a picture or screen shot of the proper calibration verification screen. The shots are required in order to process an engine/transmission/drivetrain hard part warranty transaction.


In a GDS 2 Calibration History Events Screen, up to 10 Calibration History Events can be displayed. (Fig. 7)


Refer to the applicable service bulletin for the specific vehicle being repaired for information on how to retrieve and save the required Tech 2 or GDS 2 screen shots before disassembly or removal of engine/transmission/drivetrain components from the vehicle.


F07 cal history

Fig 7


– Thanks to Tracy Lucas. Ron Caponey and Larry Yaw

Infotainment Display Screen Conditions

On some 2015 LaCrosse, Regal, ATS, CTS Sedan (VIN A), Escalade models (with RPO AVF), SRX, XTS, Colorado, Corvette, Impala (VIN 1), Silverado, Suburban (with RPO AVF), Tahoe (with RPO AVF), Canyon, Sierra, and Yukon models (with RPO AVF) equipped with RPOs RAO (SRX Only), RAO + UA3/UY4, IO4, IO5, or IO6, there may be multiple infotainment display screen conditions. (Fig. 8) These conditions may include a blank display, the display screen stuck in incoming call view after a phone call, and a blank Rear View Camera display. In addition, other possible conditions include unavailable navigation screen audio content, USB issues, inoperative speech recognition, traffic messages and clock display issues.


For a complete list of possible conditions on specific infotainment systems, refer to #PI1375A.

 F08 cue radio

Fig 8


An updated software calibration has been released to address these conditions. Update the Human Machine Interface (HMI) Module using a USB flash drive and the Service Programming System (SPS) with the files available on TIS2Web.


The USB flash drive programming event is not a standard TIS2Web programming event. Use TIS2Web to download the updated version of the software for the vehicle that is being programmed to minimize the chance of flashing the wrong software into the HMI module.


After USB programming has been completed, reprogram the HMI module using SPS with the latest calibrations available on TIS2Web.


The vehicle modules must go to sleep for five minutes after programming the HMI module. If not, the vehicle may have a blank screen, no audio, no touch response, or the wrong splash screen may appear on the screen. If this happens, turn off the vehicle and wait the required five minutes before starting vehicle again.


– Thanks to Hassan Abdallah

XM Audio, Radio Lock-Up and other Audio Conditions

There may be several radio conditions present on some 2015 LaCrosse, Regal, ATS, CTS sedan (VIN A), ELR, Escalade models, SRX, XTS, Corvette, Impala (VIN 1), Silverado, Suburban, Tahoe, Sierra, and Yukon models equipped with infotainment system RPOs IO3, IO4, IO5, or IO6.


These audio conditions may include:

• Slow response tuning to XM stations

• Poor radio reception

• Time shift rewind/pause button highlighted but does not function

• Radio lock-up when the clock screen mode is activated

• If the audio source is changed right before turning off the ignition, the next ignition cycle may not have any audio

• Removal of vertical line between clock and temperature

• No XM audio, returns on next ignition cycle


An updated software calibration has been released to address these conditions. Reprogram the radio using the Service Programming System (SPS) with the latest calibrations available on TIS2Web.


TIP: The IO3 infotainment system may take 2-plus hours to complete programming. Due to the length in programming, a wired internet connection is preferred. When programming the IO3 infotainment system, do not let the TIS2Web computer go to sleep during the programming event.


The vehicle modules must go to sleep for five minutes after programming the Human Machine Interface (HMI) module. If not, the vehicle may have a blank screen, no audio, no touch response, or the wrong splash screen may appear on the screen. If this happens, turn off the vehicle and wait the required five minutes before starting vehicle again.


– Thanks to Hassan Abdallah


Techline Infotainment DVD Software Update

There may be several infotainment system conditions, such as a blank screen after startup, inoperable touch screen, and Bluetooth and navigation issues, on some 2013 ATS, SRX, XTS; 2014 LaCrosse, Regal, CTS sedan, ELR, Corvette, Impala, Silverado 1500, Sierra 1500; 2015 Escalade models, Silverado 2500/3500 (without RPO AVF), Suburban, Tahoe, Sierra 2500/3500 (without RPO AVF) and Yukon models equipped with infotainment system RPOs RAO (SRX only), RAO + UA3/UY4, IO4, IO5 or IO6.


TIP: On 2013 ATS, SRX and XTS models equipped with a navigation system, ensure that the USB update from the most current version of #PI1062 has been installed with the provided USB flash drive.


A number of infotainment system operating conditions are addressed with Techline Infotainment DVD software release V-IN2014-14-15 DVD. Refer to #PI1126 for a complete list of possible infotainment system conditions.


Check HMI Build Version


Before updating the infotainment system software, check the Human Machine Interface (HMI) build version. The HMI build version label should be GMG2.12.6N146.4 or lower. (Fig. 9)


If the software version is higher than GMG2.12.6N146.4, damage to the HMI module may occur. Do not update the infotainment system software if the software version is higher than GMG2.12.6N146.4.


F09 HMI number

Fig 9


To verify the HMI build version on Buick, Chevrolet and GMC models, press the Power, Menu and Home buttons at the same time on the infotainment system, and then select HMI from the onboard development screen. (Fig. 10)


F10 Chevy buttons

Fig 10


For Cadillac models, press the Home and Volume Down buttons at the same time, and then select HMI from the onboard development screen. (Fig. 11)


F11 Cadillac buttons

Fig 11


Update the HMI Module using a USB flash drive and the Service Programming System (SPS) with the files available on TIS2Web. Use TIS2Web to download the correct version of the software for the vehicle that is being programmed.


After USB programming has been completed, reprogram the HMI module using SPS with the latest calibrations available on TIS2Web.


The vehicle modules must go to sleep for five minutes after programming the HMI module.


TIP: For infotainment system RPO IO5, a production change in the software changes the Navigation icon (NAV) display to the NAV OnStar icon display.


– Thanks to Hassan Abdallah

Incorrect Door Latch Rod

After unlocking some 2012-2015 LaCrosse models, equipped with the Passive Entry Passive Start (PEPS) Keyless Start system (RPO ATH), using the Unlock button on the key fob, the vehicle may not respond when pressing the Engine Start button.


The vehicle will not crank and a “! Remote Learn Pending Please Wait” or “Ready For Fob Three” message may display on the Driver Information Center (DIC). There will not be any other response from the vehicle.


DTCs B3125 sym02 (Driver Door Only Unlock Circuit), B3130 sym02 (All Doors Unlock Circuit) and/or B3135 sym02 (All Doors Lock Circuit) may be set.


If this condition is exhibited, exit and lock the vehicle. Wait five minutes, depress the Unlock button on either key fob 3–5 times within 10 seconds, and then enter the vehicle. If either message is displayed on the DIC or there is a similar condition, use the key to check the rotation of the driver’s door lock cylinder.


Door Lock Cylinder-To-Latch Rod


If the key rotates further than the normal 90 degrees when unlocking the driver’s door, the vehicle may have been assembled with the incorrect door lock cylinder-to-latch rod.


Remove the door latch assembly. Check the rod to determine if the correct linkage configuration is installed. In the following illustration, the correct linkages for the LaCrosse are in purple (1). The incorrect linkages are in yellow (2). (Fig. 12)


Replace the door lock cylinder-to-latch rod as required. Reference the Electronic Parts Catalog (EPC) to determine the correct rod to order and install.


F12 linkages

Fig 12


– Thanks to Christopher Crumb

GDS 2 Enhances Vehicle Selection Functionality

The Global Diagnostic System (GDS) 2 recently received several enhancements with the latest core application update. The new functions make it easier for technicians to select and build a vehicle in GDS 2.


Look for these new functions in the recent February 9, 2015 software update release. Launch GDS 2 from the TIS2Web home page to get the update.


TIP: It is important to always update the GDS 2 scan tool when new versions are released. Notification of diagnostic package updates will appear on the Home page of GDS 2. Click the Update button to download. Updates to the core application are available by launching GDS 2 from TIS2Web.


Red X Button


The red X button at the top right of the screen and dialogue boxes is now functional throughout GDS 2.


If the red X is not able to close the current screen, a dialogue box will appear stating that the screen cannot be closed and the Back button should be used to try exiting again. (Fig. 13)


F13 gds2 red x

Fig 13


RPO Codes


When vehicle RPO codes are available, GDS 2 can now recommend the RPO codes to select based on the vehicle configuration information.


To activate the Auto RPO function:

1. Click the Preferences link on the GDS 2 home page.

2. Under the General tab, select Basics.

3. Click the box for Automatically Answer RPO Questions. (Fig. 14)


When checking the Selected by Default selection, RPO questions will be automatically answered with the recommended RPOs. If not selected, the recommended RPOs will be highlighted for the user to select.


F14 gds2 rpo pref

Fig 14


If it’s desired to not have the Auto RPO function active for the current session, click the Session Manager shortcut button (gear icon) that has been added in the Selected Vehicle Configuration field. It will open the Session Manager screen, where the Auto RPO functionality for the current session can be disabled by deselecting the checkbox for Automatically Answer RPO Questions. (Fig. 15) The Auto RPO feature will be disabled for the current session only.


F15 gds2 rpo box

Fig 15


Message Bar


A color-coded message bar has been implemented in GDS 2 to provide additional information for the user.


A red message bar indicates the tool is waiting for a user action, such as selecting a device or entering a VIN. (Fig. 16) The Enter button will be disabled until all necessary information is entered correctly and the proper selections are made.


F16 gds2 red message

Fig 16


Once GDS 2 is processing a task, the message bar will be yellow and display the current activity.


Once the green message bar appears, indicating vehicle data has been loaded, the Enter button will be enabled. (Fig. 17) The VIN entry is optional. If a VIN is not entered a session name will be created using the following format: NO VIN YY MM DD HH MM SS.


F17 gds2 green message

Fig 17


Session File Error


Sessions can become corrupt through normal usage when portions of a file fail to save properly, similar to any Windows application files.


In the Vehicle Selection area, if there is one or more corrupted session files detected when GDS 2 is attempting to load a vehicle, a message will be displayed stating the invalid session has been detected and either the most recent valid session will be loaded or that GDS 2 is unable to load the session.


Corrupted sessions will be marked with an exclamation point in the stored sessions file. The exclamation point column appears only when a corrupted session is detected by GDS 2. If an invalid session is detected during import, the session will be removed and will not appear in the stored sessions file.


Value Source


The Value Source column provides the user with information about how the data was obtained based on the source. (Fig. 18) For example, In the Selected Vehicle area or the Stored Data Review, the source may be the VIN. Or in the Selected Vehicle Configuration, the source may be the RPO.


F18 gds2 value source

Fig 18


Always update the GDS 2 scan tool diagnostic package to the latest version available and any time a communication condition is encountered, verify the latest update is being used.


– Thanks to Chris Henley

Techlink Engine Oil Capacities

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Click to download

Service Know-How

10215.02D – Emerging Issues

February 12, 2014


To view Emerging Issues seminars:

• Log in to

–   Select Resources > Service Know-How/TECHAssist > Emerging Issues > Searchable Streaming Video; or

–   Select Catalog to search for the course number, and then select View > Take or Continue Course

Service Technical College – New Training Courses

Following are the latest service technical courses available to technicians through the GM Service Technical College.


For more information about available service training courses, log in to the GM Center of Learning at and click the Catalog link. Use the drop-down menus to search for courses by delivery type, audience, and category.


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Bulletin Review – January 2015

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