GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

Connector End View Reference: Component 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 all door locks and switches are inoperative.

Do the power door locks operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Is the DR/LOCK fuse open?

Go to Step 6

Go to Step 4

4

Test the battery positive voltage circuit of the lock switches for an open or high resistance.

Did you find and correct the condition?

Go to Step 8

Go to Step 5

5

Inspect for poor connections at the Door Lock Relay.

Did you find and correct the condition?

Go to Step 8

Go to Step 7

6

Repair the short to ground in one of the following circuits:

    • Driver door lock actuator unlock control
    • Door lock actuator lock control
    • Door lock actuator unlock control

Did you complete the repair?

Go to Step 8

--

7

Replace the Door Lock Relay.

Did you complete the replacement?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2