GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the BCM diagnostic system check performed?

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Go to Step 2

Go to Diagnostic System Check - Body Control System

2

Set the last door closed locking control to mode 2. Refer to Power Door Locks Circuit Description

Is the locking mode set to mode 2?

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Go to Step 3

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3

  1. Close all the vehicle doors.
  2. Ensure the IP dimmer switch is in the OFF position.
  3. Turn the ignition switch to the RUN position.
  4. Open and then close all the vehicle doors. Perform this step one door at a time.

Did the courtesy lamps turn ON with the door open and then OFF with all the doors closed?

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Go to Step 4

Go to Step 6

4

  1. Ensure the IP dimmer switch is in the OFF position.
  2. Ensure all the doors are closed.
  3. Turn the ignition switch from the RUN position to the LOCK position.
  4. Remove the key from the ignition key cylinder while observing the courtesy lamps.

Do the courtesy lamps turn ON?

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Go to Step 5

Go to Step 7

5

  1. Turn the ignition switch to the RUN position.
  2. Lower all the vehicle windows.
  3. Turn the ignition switch to the OFF position.
  4. Remove the key from the ignition key lock cylinder.
  5. Step out of the vehicle.
  6. Ensure all the passenger doors are closed except the drivers door.
  7. Press the lock on the drivers door lock switch. Listen for 3 chimes.
  8. Close the drivers door.
  9. Within 5 seconds, open the left rear door. Listen for 3 chimes.
  10. Close the left rear door.
  11. Wait for 5 seconds while observing the door locks.
  12. Unlock and open the right front door.
  13. Press the lock on the door lock switch. Listen for 3 chimes.
  14. Close the right front door.
  15. Wait 5 seconds, open the right rear door. Listen for 3 chimes.
  16. Close the right rear door.
  17. Wait 5 seconds while observing the door locks.
  18. Ensure there is no key in the ignition key lock cylinder.
  19. Press the lock on either door lock switch in order to ensure all the doors lock 5 seconds after the last door is closed.

Do the door locks operate as described above?

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Go to Step 8

Go to Step 9

6

Inspect the last door lock feature for a problem due to a malfunction between the BCM and the door lock ajar switches. Refer to Interior Lamps System Check

Is the action complete?

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Go to Step 10

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7

Inspect the last door lock feature for a problem due to a malfunction between the BCM and the ignition key alarm switch. Refer to Audible Warnings System Check

Is the action complete?

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Go to Step 10

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8

  1. Inspect the lockout prevention feature.
  2. Ensure the lockout prevention feature is operating correctly. Refer to Power Door Locks Circuit Description

Is the action complete?

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Go to Step 10

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9

  1. Inspect the BCM connectors for poor terminal contact.
  2. If the connectors are good, replace the BCM. Refer to Body Control Module Replacement in Body Control System.
  3. After BCM replacement, perform the Setup New BCM Procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Is the action complete?

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Go to Step 10

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10

  1. Turn the ignition switch to the LOCK position.
  2. Reinstall the connectors.
  3. Reinstall the components.

Have all the repairs been made?

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Go to Power Door Locks System Check

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