GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Door Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

Check for proper operation of the power door locks.

Does the power door lock system operate from the door lock switches?

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Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

  1. Install the scan tool.
  2. Monitor the door lock and unlock relay data for the driver's and passenger doors.
  3. Press the door lock switch to the lock and unlock positions while monitoring the data.

Does the scan tool display ON?

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Go to Step 4

Go to Step 8

4

Using a test lamp, test for voltage at the door lock relay from the door lock fuse.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 5

5

Test for a short to ground in the driver's door lock circuit.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 9

6

  1. Using a fused jumper wire, jump access the door lock relay.
  2. Press the door lock switch to the lock position.

Do the doors lock?

--

Go to Step 10

Go to Step 7

7

Repair the open in the door lock relay output circuit.

Did you find and correct the condition?

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Go to Step 11

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8

Repair the short to ground or open in the battery positive voltage circuit between the fuse block and the door lock switches.

Did you find and correct the condition?

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Go to Step 11

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9

Replace the driver's door lock actuator.

Did you complete the replacement?

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Go to Step 11

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10

Replace the door lock relay.

Did you complete the replacement?

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Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3