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For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Grand Am 🢒 Body and Accessories 🢒 Doors 🢒 Power Door Locks Inoperative - One Motor

Power Door Locks Inoperative - One Motor LF- Door Lock Inoperative

Step

Action

Value(s)

Yes

No

Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.

1

Was the system check performed?

--

Go to Step 2

Go to Power Door Locks System Check

2

Perform the body control module (BCM) diagnostic system check.

Are any door lock DTCs present?

--

Go to Body Control Module System Check

Go to Step 3

3
  1. Exchange the drivers door unlock relay with a known good relay.
  2. Activate the door lock switch to the unlock position.

Does the LF door lock actuator operate correctly?

--

Go to Step 4

Go to Step 5

4

Replace the drivers door unlock relay.

Is the repair complete?

--

Go to Power Door Locks System Check

--

5
  1. Connect a test lamp.
  2. Backprobe between the left IP junction block connector C3 terminal C2 and ground.
  3. Actuate the door lock switch to the unlock position.

Does the test lamp light?

--

Go to Step 6

Go to Step 12

6
  1. Connect a test lamp.
  2. Backprobe between the left IP junction block connector C3 terminal C2 and ground.
  3. Actuate the door lock switch to the lock position.

Does the test lamp light?

--

Go to Step 7

Go to Step 17

7
  1. Disconnect the LF door lock actuator electrical connector.
  2. Connect a test lamp between connector terminal A and ground.
  3. Actuate the door lock switch to the unlock position.

Does the test lamp light?

--

Go to Step 8

Go to Step 10

8
  1. Connect a test lamp between connector terminal B and ground.
  2. Actuate the door lock switch to the lock position.

Does the test lamp light?

--

Go to Step 9

Go to Step 11

9

Replace the LF door lock actuator.

Is the repair complete?

--

Go to Power Door Locks System Check

--

10

Repair the open in CKT 294.

Is the repair complete?

--

Go to Power Door Locks System Check

--

11

Repair the open in CKT 295 between the LF door lock actuator and the left IP junction block.

Is the repair complete?

--

Go to Power Door Locks System Check

--

12
  1. Connect a test lamp.
  2. Backprobe between the left IP junction block connector C1 terminal C10 and ground.
  3. Actuate the door lock switch to the unlock position.

Does the test lamp light?

--

Go to Step 13

Go to Step 14

13

Replace the left IP junction block.

Is the repair complete?

--

Go to Power Door Locks System Check

--

14
  1. Connect a test lamp.
  2. Backprobe between the BCM connector C3 terminal A2 and ground.
  3. Actuate the door lock switch to the unlock position.

Does the test lamp light?

--

Go to Step 15

Go to Step 16

15

Repair the open in CKT 356 between the BCM and the left IP junction block.

Is the repair complete?

Go to Power Door Locks System Check

--

16

Inspect for a poor connection at the BCM connector C3. If OK, replace the BCM.

Is the repair complete?

Go to Power Door Locks System Check

--

17

Repair the open in CKT 295 between the left IP junction block and the LF door lock actuator.

Is the repair complete?

Go to Power Door Locks System Check

--

Power Door Locks Inoperative - One Motor RF - Door Lock Inoperative

Step

Action

Value(s)

Yes

No

Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.

1

Was the power door locks system check performed?

--

Go to Step 2

Go to Power Door Locks System Check

2

Perform the body control module (BCM) diagnostic system check.

Are any door lock DTCs present?

--

Go to Body Control Module System Check

--

3
  1. Remove the key from the ignition switch.
  2. Disconnect the electrical connector from the door lock actuator that does not operate.
  3. Connect a test lamp between terminal A of the connector and ground.
  4. Actuate either door lock switch to the unlock position.

Does the test lamp light?

--

Go to Step 4

Go to Step 6

4
  1. Connect a test lamp between terminal B of the connector and ground.
  2. Actuate either door lock switch to the lock position.

Does the test lamp light?

--

Go to Step 5

Go to Step 7

5

Replace the door lock actuator.

Is the repair complete?

--

Go to Power Door Locks System Check

--

6

Repair the open in CKT 294 between the non-operating door lock actuator and the left IP junction block.

Is the repair complete?

--

Go to Power Door Locks System Check

--

7

Repair the open in CKT 295 between the non-operating door lock actuator and the left IP junction block.

Is the repair complete?

--

Go to Power Door Locks System Check

--

Power Door Locks Inoperative - One Motor LR or RR Door Lock Inoperative

Step

Action

Value(s)

Yes

No

Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.

1

Was the power door locks system check performed?

--

Go to Step 2

Go to Power Door Locks System Check

2

Perform the body control module (BCM) diagnostic system check.

Are any door lock DTCs present?

--

Go to Body Control Module System Check in Body Control System

Go to Step 3

3
  1. Remove the key from the ignition switch.
  2. Disconnect the electrical connector to the door lock actuator that does not operate.
  3. Connect a test lamp between terminal A of the connector and ground.
  4. Actuate either door lock switch to the UNLOCK position.

Does the test lamp light?

Go to Step 4

Go to Step 6

4
  1. Connect a test lamp between terminal B of the connector and ground.
  2. Actuate either door lock switch to the LOCK position.

Does the test lamp light?

Go to Step 5

Go to Step 7

5

Replace the door lock actuator.

Is the repair complete?

Go to Power Door Locks System Check

--

6

Repair the open in CKT 294 between the non-operating door lock actuator and the left IP junction block.

Is the repair complete?

Go to Power Door Locks System Check

--

7

Repair the open in CKT 295 between the non-operating door lock actuator and the left IP junction block.

Is the repair complete?

Go to Power Door Locks System Check

--