GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect Fuse 32 in the fuse block.

Is Fuse 32 open?

--

Go to Step 2

Go to Step 3

2

  1. Replace Fuse 32.
  2. Inspect Fuse 32 again.

Is Fuse 32 open?

--

Go to Step 12

Go to Step 23

3

Use a test light in order to backprobe between the door lock relay connector terminal C and the ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 13

4

Use a test light in order to backprobe between the door lock relay connector terminal C and terminal D.

Does the test light illuminate?

--

Go to Step 5

Go to Step 14

5

Use a test light in order to backprobe between the left or the right door lock switch terminal B and the ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 15

6

  1. Disconnect the door lock relay.
  2. Use a test light in order to probe the door lock relay connector terminal B and the ground.

Does the test light illuminate?

--

Go to Step 16

Go to Step 7

7

Use a test light in order to probe between B+ and the door lock relay connector terminal B.

Does the test light illuminate?

--

Go to Step 17

Go to Step 8

8

Use a test light in order to backprobe between B+ and the door lock relay connector terminal E.

Does the test light illuminate?

--

Go to Step 18

Go to Step 9

9

Use a test light in order to backprobe between the door lock relay connector terminal E and the ground.

Does the test illuminate light?

--

Go to Step 19

Go to Step 10

10

  1. Reconnect the door lock relay.
  2. Use a test light in order to backprobe between the door lock relay connector terminal B and terminal E.
  3. While observing the test light, press either door lock switch to the LOCK position, and then the UNLOCK position.

Does the test light light when pressing the door lock switch to the LOCK position, and then the UNLOCK position?

--

Go to Step 11

Go to Step 20

11

  1. Use a test light in order to backprobe between any door lock actuator connector terminal A and the ground.
  2. While observing the test light, press either door lock switch to the UNLOCK position.

Does the test light illuminate?

--

Go to Step 21

Go to Step 22

12

Repair the short to ground in circuit 1540.

Is the repair complete?

--

Go to Step 23

--

13

Repair the poor connection or an open in CKT 1540 between the door lock relay connector and the fuse block.

Is the repair complete?

--

Go to Step 23

--

14

Repair the poor connection or an open in CKT 750 between the door lock relay connector and G302.

Is the repair complete?

--

Go to Step 23

--

15

Repair the poor connection or an open in CKT 1140 between the fuse block and S306.

Is the repair complete?

--

Go to Step 23

--

16

Repair a short to B+ in CKT 295.

Is the repair complete?

--

Go to Step 23

--

17

Repair a short to ground in CKT 295.

Is the repair complete?

--

Go to Step 23

--

18

Repair a short to ground in CKT 294.

Is the repair complete?

--

Go to Step 23

--

19

Repair a short to B+ in CKT 294.

Is the repair complete?

--

Go to Step 23

--

20

  1. Inspect for a poor connection at the door lock relay.
  2. If the connection is OK at the door lock relay, replace the door lock relay.

Is the repair complete?

--

Go to Step 23

--

21

Repair the poor connection or an open in CKT 295 between the door lock relay connector and S315.

Is the repair complete?

--

Go to Step 23

--

22

Repair the poor connection or an open in CKT 294 between the door lock relay connector and S314.

Is the repair complete?

--

Go to Step 23

--

23

  1. Ensure that the ignition switch is in the LOCK position.
  2. Reconnect any connectors or any components that you removed.

Have all repairs been made?

--

Go to Power Door Locks System Check

--