GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the power door locks system check?

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Go to Step 2

Go to Power Door Locks System Check

2

  1. Connect a scan tool.
  2. Read the body control module (BCM) current diagnostic trouble codes (DTCs).

Are there any current DTCs?

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Go to Body Control Module (BCM) Diagnostic System Code

Go to Step 3

3

  1. Remove the right door lock and window switch.
  2. Connect a test lamp between CKT 840 terminal D and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

4

Repair an open in CKT 840.

Is the repair complete?

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Go to Power Door Locks System Check

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5

Connect a fused jumper between CKT 840 terminal D and then back and forth between CKT 194 (WHT) terminal E and CKT (LT BLU) terminal C at the right door lock and side window switch connector.

Do the doors lock and unlock?

--

Go to Step 6

Go to Step 5

6

Replace the right door lock and side window switch.

Is the repair complete?

--

Go to Power Door Locks System Check

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7

  1. Reinstall the right door lock and side window switch.
  2. Connect a scan tool.
  3. Move the UNLOCK switch while monitoring the input from the right door lock and side window switch.

Does the scan tool display UNLOCK?

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Go to Step 8

Go to Step 9

8

  1. Remove the door unlock relay.
  2. Connect a fused jumper between cavity 5 and cavity 3 of the body relay block.

Does the passenger door unlock?

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Go to Power Door Locks System Check

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9

Repair the open in CKT 194 (WHT).

Is the repair complete?

--

Go to Step 6

Go to Step 10

10

Replace the door unlock relay?

Is the repair complete?

--

Go to Power Door Locks System Check

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11

  1. Connect a test lamp from CKT 294 (TAN) terminal A at the right door lock actuator to ground.
  2. Press the right door lock switch to the UNLOCK position.

Does the test lamp light?

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Go to Step 12

Go to Step 13

12

  1. Disconnect the left door lock actuator.
  2. Connect a test lamp from CKT 294 terminal A to CKT 295 terminal B.
  3. Press the left door lock switch to the LOCK and UNLOCK positions.

Does the test lamp light?

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Go to Step 14

Go to Step 15

13

Repair the open in CKT 294 to CKT 294 (TAN) terminal B.

Is the repair complete?

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Go to Power Door Locks System Check

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14

Replace the right door lock actuator.

Is the repair complete?

--

Go to Power Door Locks System Check

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15

Repair the open in CKT 295 (GRY).

Is the repair complete?

--

Go to Power Door Locks System Check

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