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. Remove the left front door unlock relay from the rear compartment relay center 3.
  2. Connect a 3-amp fused jumper between the left front door unlock relay terminal A4 and terminal B5.
  3. Move the power door switch to LOCK.

Did the left front door lock?

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Go to Step 3

Go to Step 4

3

  1. Inspect the left front door unlock relay for poor terminal contact.
  2. If the terminal contact is OK, replace the left front door unlock relay.

Is the repair complete?

--

Go to Power Door Locks System Check

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4

  1. Connect a 3-amp fused jumper between the left front door unlock relay terminals A4 and ground.
  2. Move the power door switch to LOCK.

Did the left front door lock?

--

Go to Step 5

Go to Step 6

5

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

Is the repair complete?

--

Go to Power Door Locks System Check

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6

  1. Install the left front door unlock relay into the rear compartment relay center 3.
  2. Disconnect the left front door lock actuator connector.
  3. Connect a J 39200 digital multimeter (DMM) between the actuator connector terminal A and terminal B.
  4. Move the door lock switch to UNLOCK.

Is the voltage within the specified range?

10-15 V

Go to Step 7

Go to Step 8

7

  1. Inspect the left front door lock actuator connector for cleanliness and tightness.
  2. If the connector is OK, replace the left front door lock actuator. Refer to Door Lock Actuator Replacement .

Is the repair complete?

--

Go to Power Door Locks System Check

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8

  1. Connect a J 39200 digital multimeter (DMM) between the left front door actuator terminal B and ground.
  2. Move the power door lock switch to LOCK.

Is the voltage within the specified range?

10-15 V

Go to Step 9

Go to Step 10

9

Repair the open in CKT 694 (TAN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Power Door Locks System Check

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10

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

Is the repair complete?

--

Go to Power Door Locks System Check

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