GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics and Instrument Cluster Schematics

Connector End View Reference: Vehicle Access Component Views and Displays and Gages Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Verify that the door lock indicator is malfunctioning.

Does the door lock indicator operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Open the appropriate door.
  4. With a scan tool, observe the lock switch indicator command parameter in the appropriate door control module data list.

Does the scan tool cycle between Active/Inactive?

Go to Step 4

Go to Step 6

4

Test the appropriate door lock indicator voltage circuit for an open, short to ground, or short to battery voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 5

5

Test the appropriate door lock indicator ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 7

6

Inspect for poor connections at the harness connector of the appropriate door control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the appropriate door lock indicator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the appropriate door control module. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 10

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9

Replace the appropriate door lock indicator. Refer to Door Lock Status Indicator Replacement .

Did you complete the replacement?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2