|Subject:||18047 — Rear Turn Signals Illuminate When Brakes Are Applied|
|Models:||2018 Chevrolet Express Cutaway Van|
|2018 GMC Savana Cutaway Van|
|Reference Number:||N182148420||Release Date:||February 2018|
|Attention:||This service update includes vehicles in dealer inventory and customer vehicles that return to the dealership for any reason. This bulletin will expire at the end of the involved vehicle’s New Vehicle Limited Warranty period.|
|Chevrolet||Express Cutaway Van||2018||2018||V4D||Separate Stop and Turn Signal Lamps|
|GMC||Savana Cutaway Van||2018||2018||V4D||Separate Stop and Turn Signal Lamps|
This service update should be performed on vehicles in dealer inventory only. Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections and/or repairs.
|Condition||Vehicles were built with a Body Control Module (BCM) calibration file intended for separate stop and turn signal lamps (RPO V4D) and trailering capability (RPO UY7) instead of the intended calibration for separate stop and turn signal lamps but without trailering capability. The rear turn signals may illuminate solid when brakes are applied if the up-fitter installs separate stop and turn signal lamps.|
|Correction||Reprogram the BCM for separate stop and turn signal lamps but without trailering capability.|
No parts are required for this repair.
|Labor Operation||Description||Labor Time||Trans. Type||Net Item|
|9102948*||Body Control Module Reprogramming with SPS||0.5||ZFAT||N/A|
|9103649**||Module Programming Not Required||0.2||ZFAT||N/A|
* To avoid warranty transaction rejections, the SPS Warranty Claim Code(s) must be entered when submitting this transaction.
** SPS Warranty Claim Code is NOT required when submitting this transaction.
Note: Carefully read and follow the instructions below.
- Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector. If there is an interruption during programming, programming failure or control module damage may occur.
- Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. When required install the EL-49642 SPS Programming Support Tool to maintain system voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger.
- Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights (including daytime running lights), HVAC, radio, etc.
- Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M) system status indicators to NO.
- If the Same Calibration/Software Warning is noted on the SPS Controller screen, do NOT attempt to program the module. No further action is required. Refer to the Warranty section of the bulletin and use labor operation code 9103649, Module Programming Not Required.
- Reprogram the BCM. Refer to K9 Body Control Module: Programming and Setup in SI.
- Record SPS Warranty Claim Code on job card for warranty transaction submission.
Whenever a vehicle subject to this service update enters your vehicle inventory, or is in your facility for service in the future, and the vehicle is still covered under the New Vehicle Limited Warranty, you must take the steps necessary to be sure the service update correction has been made before selling or releasing the vehicle.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers’ possession and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded, released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System (CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified for sale within the CPOIS system, or once again be used in the CTP program.
To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle’s 17 character Vehicle Identification Number (VIN) and select ‘Get CAL ID’.
You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.
The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.
The following are the supported interface tools:
|OEM GM Tech 2 Dealer Package|
|Bosch GM MDI 2 (2nd Gen) MDI2 interface|
The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.
The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles. The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.