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?

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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

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