Standard Procedure - Wireless Control Module (WCM) Verification: SKREEM
NOTE:
If the PCM and the WCM are replaced at the same time, program the PCM VIN into the PCM first.
NOTE:
The PCM stores the secret key information. If the WCM ever needs to be replaced, the secret key information can be retrieved from the PCM and then transferred to the WCM for security use.
During PCM/ECM replacement, use the following steps to ensure transfer of the secret key information from the WCM to the new PCM:
- First replace the PCM/ECM with the original WCM still connected to the vehicle.
- Using the appropriate Service Information program the new PCM/ECM. (This will ensure the Secret Key Transfer from the original WCM into the new PCM/ECM).
- Now replace and program the WCM (if necessary). This will retain the Secret Key from the PCM/ECM back into the new WCM.NOTE:
If this vehicle is equipped with a Steering Column Lock Module, it must be replaced along with the WCM.
- With the scan tool, select Miscellaneous Functions, WCM/Wireless Control Module. Then select the desired procedure and follow the display on the scan tool.
- If the vehicle is equipped with Tire Pressure Monitoring System program the Placard Pressure Values into the WCM.
- Ensure all the customer's keys have been programmed into the new module if necessary.
- With the scan tool, erase all DTCs. Perform 5 ignition key cycles, leaving the key on for at least 90 seconds per cycle.
- With the scan tool, read WCM DTCs.