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 3. Refer to Power Door Locks Circuit Description

Is the locking mode set to mode 3?

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Go to Step 3

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3

Check for Powertrain control module (PCM) DTCs. Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls.

Is the action complete?

Go to Step 4

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4

  1. Open the windows.
  2. Close all the vehicle doors.
  3. Ensure the IP dimmer switch is in the OFF position.
  4. Turn the ignition switch to the RUN position.
  5. 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 5

Go to Step 6

5

  1. Close all the vehicle doors.
  2. Ensure all the doors are locked.
  3. Start the engine.
  4. Press the brake pedal firmly and hold down.
  5. Shift the transaxle into DRIVE while observing the door locks.
  6. Shift the transaxle into PARK while observing the door locks.
  7. Stop the engine.
  8. Observe the door locks lock when shifting the transaxle out of PARK and the door locks unlock when shifting the transaxle into PARK.

Do the door locks operate as described above?

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Go to Step 7

Go to Step 8

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

Has the repair been made?

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Go to Step 9

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7

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

Has the repair been made?

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Go to Step 9

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8

  1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
  2. After BCM replacement, perform the Setup New BCM Procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Has the repair been made?

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Go to Step 9

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9

  1. Turn the ignition switch to the LOCK position.
  2. Reconnect 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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