GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Actuate the door lock switch to both the lock and unlock positions.

Did both the doors lock and unlock from the switch?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Did the door lock switch lock and unlock the driver door?

Go to Step 4

Go to Power Door Locks Inoperative

4

  1. Disconnect the passenger door lock actuator.
  2. Connect a test lamp between the door lock actuator lock circuit at the door lock actuator harness connector and a good ground.
  3. Actuate a door lock switch to the lock position.

Did the test lamp illuminate?

Go to Step 5

Go to Step 6

5

  1. Connect a test lamp between the door lock actuator unlock circuit at the door lock actuator harness connector and a good ground.
  2. Actuate a door lock switch to the unlock position.

Did the test lamp illuminate?

Go to Step 8

Go to Step 7

6

Repair the open in the door lock motor lock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

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7

Repair the open in the door lock motor unlock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

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8

Inspect for poor connections at the door lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

9

Replace the door lock actuator. Refer to Door Latch Replacement .

Did you complete the repair?

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