GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Door Lock System Check?

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Go to Step 2

Go to Power Door Locks System Check

2

  1. Connect a Scan Tool to the Data Link Connector (DLC).
  2. Select the Body Control Module (PZM) on the scan tool.
  3. Operate the inoperative door lock cylinder switch.

Does the PZM receive the door lock cylinder input?

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Go to Step 3

Go to Step 4

3

Replace the PZM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the repair?

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Go to Power Door Locks System Check

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4

Test the door lock cylinder switch.

Did you find a condition?

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Go to Step 5

Go to Step 6

5

Replace the door lock cylinder switch. Refer to Door Lock Cylinder Replacement .

Did you complete the repair?

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Go to Power Door Locks System Check

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6

Test one of the following circuits for an open or short to ground:

    • CKT 262 (LT GRN) for the LH front door lock cylinder switch
    • CKT 265 (LT GRN) for the RH front door lock cylinder switch

Is the circuit OK?

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Go to Step 8

Go to Step 7

7

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

    • CKT 262 (LT GRN) for the LH front door lock cylinder switch
    • CKT 265 (LT GRN) for the RH front door lock cylinder switch

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Power Door Locks System Check

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8

Repair the open in one of the following circuits:

    • CKT 51 (BLK/WHT) for the LH front door lock cylinder switch
    • CKT 151 (BLK/WHT) for the RH front door lock cylinder switch

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Power Door Locks System Check

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