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

Verify that the unlock function is inoperative but the lock function operates normally.

Do the power door locks operate normally?

--

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

Go to Step 3

3

Is the unlock function inoperative from both door lock switches.

--

Go to Step 7

Go to Step 4

4

Test for an open in CKT 194 (WHT). Refer to Circuit Testing in wiring systems.

Is an open present?

--

Go to Step 5

Go to Step 6

5

Repair an open in CKT 194 (WHT).

Is the repair complete?

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Go to Step 8

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6

Replace the defective door lock and side window switch. Refer to Front Side Door Window Switch Replacement .

Is the repair complete?

--

Go to Step 8

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7

Replace the door unlock relay.

Is the repair complete?

--

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3