GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic should only be used if the door locks are operational but do not lock after the last door is closed.

1

Has the Power Door Locks System Check been performed?

--

Go to Step 2

Go to Power Door Locks System Check

2

  1. Connect a test lamp between the door lock control module connector cavity C an ground.
  2. Press any door lock switch to the LOCK position.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair open in CKT 195 (LT BLU) between door lock control module and S431. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Power Door Locks System Check

--

4

  1. Close all vehicle doors.
  2. Connect a test lamp between door lock control module connector cavity B and B+.

Does test lamp light?

--

Go to Step 5

Go to Step 6

5

Repair short to ground in CKT 328 (PPL) between door lock control module and door jamb switches.module and S431. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Power Door Locks System Check

--

6

Connect a test lamp between door lock control module connector cavity F and B+.

Does test lamp light?

--

Go to Step 7

Go to Step 8

7

Repair short to ground in CKT 1897 (ORN/BLK) between door lock control module and rear door jamb switch.module and S431. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Power Door Locks System Check

--

8

  1. Open the rear cargo doors.
  2. With the test lamp still connected at cavity F and B+, observe the lamp.

Does the test lamp light?

--

Go to Step 9

Go to Step 10

9

Replace the door lock control module.

Is the repair complete?

--

Go to Power Door Locks System Check

--

10

Repair the open in CKT 1897 (ORN/BLK) between door lock control module and rear door jamb switch.module and S431. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Power Door Locks System Check

--