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 BCM, special functions, door lock test.
  3. Command the driver's door unlock, unlock all door, door lock from ON to OFF.

Does the commanded state match the output?

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Go to Step 4

Go to Step 3

3

Replace the body control module (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

  1. Disconnect the power door lock relay.
  2. Connect a J 39200 digital multimeter (DMM) between relay terminal D and ground.

Is the voltage within the specified range?

10-15 V

Go to Step 6

Go to Step 5

5

Repair the open or the short to ground in CKT 2040 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Power Door Locks System Check

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6

Connect a J 39200 digital multimeter (DMM) between the power door lock relay terminals D and C.

Is the voltage within the specified range?

10-15 V

Go to Step 8

Go to Step 7

7

Repair the open in CKT 1250 (BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Power Door Locks System Check

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8

  1. Connect a 3-amp fused jumper between the power door lock relay terminal D and terminal B.
  2. Momentarily connect a 3-amp fused jumper between the power door lock relay terminal C and terminal E.

Does the power door locks lock?

--

Go to Step 12

Go to Step 9

9

Test for an open or a short to ground in CKT 294 (TAN) between the power door lock relay and S325.

Is the circuit OK?

--

Go to Step 11

Go to Step 10

10

Repair the open or the short to ground in CKT 294. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Power Door Locks System Check

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11

Repair the open or the short to ground in CKT 295 (GRY). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Power Door Locks System Check

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12

  1. Inspect the power door lock relay for poor terminal contact.
  2. If OK, replace the power door lock relay.

Is the repair complete?

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Go to Power Door Locks System Check

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