Envoy 2WD V6-4.3L VIN W (1998)
Vehicle Control Module: Service and Repair
Password Learn Procedure
Using A T50/T60/T20+
IMPORTANT: Refer to DTC P1631 Theft Deterrent Password Incorrect if the Passlock Learn Procedure cannot be completed successfully.
PROCEDURE
1. Using the T50/T60/T20+, enter the Service Programming System (SPS).
2. Select Terminal to Vehicle Programming.
3. Select Done and follow the instructions on the Vehicle Set-up screen
4. Select Vehicle Theft Re-learn.
5. Follow the instructions on the remaining screens.
^
The VCM and the Passlock control module will prepare for a re-learn.
^
A security timer will be ON for approximately 10 minutes.
^
When the VCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.
Using A Tech 2 Scan Tool
IMPORTANT: Refer to DTC P1631 Theft Deterrent Password Incorrect if the Passlock Learn Procedure cannot be completed successfully.
PROCEDURE
1. Using a Tech 2 enter the Service Programming System (SPS).
2. After entering the vehicle information, choose the Request Info soft key on the Tech 2.
3. Select Done and follow the instructions on the Vehicle Set-up screen
4. Disconnect the Tech 2 from the vehicle and connect the Tech 2 to a Techline terminal.
5. At the Techline terminal, select Service Programming System (SPS), select the Terminal to Scan Tool Programming method and then select Done.
6. Follow the instructions on the remaining screens.
7. Select Vehicle Theft Re-learn.
8. Select Program at the summary screen. The terminal will download the information to the Tech 2.
9. Return the Tech 2 to the vehicle and connect the Tech 2 to the Diagnostic Link Connector (DLC).
10. Select Service Programming from the Tech 2 main menu. Answer the prompts regarding the model year and vehicle type. Press the Theft Re-learn
soft key on the Tech 2.
11. Follow the instructions on the remaining screens.
^
The VCM and the Passlock control module will prepare for re-learn.
^
A security timer will be on for approximately 10 minutes.
^
When the VCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.
Without Tech 2 Scan Tool or Techline Terminal
IMPORTANT: While the VCM is in the Auto Learn Procedure, maintain the battery voltage at all times. Follow the procedure exactly as indicated or
the procedure will have to be repeated from the beginning.
PROCEDURE
1. Attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light
will remain ON for 10 minutes and then go OFF).
2. After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
3. Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security
light will remain ON for 10 minutes and then go OFF).
4. After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
5. Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security
light will remain ON for 10 minutes and then go OFF).
6. Turn the ignition OFF for 30 seconds.
7. Turn the ignition ON and wait 30 seconds.
8. Attempt to start the engine.
