GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Audible Warnings System Check?

--

Go to Step 2

Go to Audible Warnings System Check

2

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the body control module (MALL) connector C1.
  3. Measure the voltage from connector C1 terminal G (harness side) to ground.

Does the measured voltage match the specified value?

12 V

Go to Step 4

Go to Step 3

3

Inspect CKT 640 (ORN) for an open.

Is the wiring OK?

--

Go to Audible Warnings System Check

Go to Step 10

4

  1. Turn the ignition switch to the OFF position.
  2. Measure the voltage from connector C1 terminal H (harness side) to ground.

Does the measured voltage match the specified value?

12 V

Go to Step 6

Go to Step 5

5

Inspect CKT 540 (ORN/BLK) for an open or a short to ground.

Is the wiring OK?

--

Go to Audible Warnings System Check

Go to Step 15

6

  1. Turn the ignition switch to the OFF position.
  2. Measure the voltage from connector C1 terminal H (harness side) to terminal D (harness side) .

Does the measured voltage match the specified value?

12 V

Go to Step 8

Go to Step 7

7

Inspect CKT 1450 (BLK) for an open.

Is the circuit OK?

--

Go to Audible Warnings System Check

Go to Step 18

8

  1. Disconnect the MALL module connector C2.
  2. Turn the ignition switch to the RUN position.
  3. Measure the voltage from connector C2 terminal C13 (harness side) to ground.

Does the measured voltage match the specified value?

12 V

Go to Step 11

Go to Step 9

9

Inspect CKT 39 (PNK) for an open or a short to ground.

Is the wiring OK?

--

Go to Step 20

Go to Step 19

10

Repair the open in CKT 640 (ORN).

Is the repair complete?

--

Go to Audible Warnings System Check

Go to Step 13

11

Inspect the MALL module connectors for proper terminal contact.

Is the contact OK?

--

Go to Step 12

--

12

Replace the MALL module. Refer to Multifunction Alarm Module Replacement.

Is the replacement complete?

--

Go to Audible Warnings System Check

--

13

Inspect fuse 6A in the IP fuse block for an open.

Is the fuse OK?

--

Go to Audible Warnings System Check

Go to Step 14

14

Replace open fuse 6A in the IP fuse block.

Is the replacement complete?

--

Go to Audible Warnings System Check

--

15

Repair the open or short to ground in CKT 540 (ORN/BLK). Refer to Repairing Damaged Wire Insulation in Wiring Systems.

Is the repair complete?

--

Go to Audible Warnings System Check

Go to Step 16

16

Inspect fuse 1 in the right fuse block for an open.

Is the fuse open?

--

Go to Step 17

Go to Audible Warnings System Check

17

Replace fuse 1 in the right fuse block.

Is the replacement complete?

--

Go to Audible Warnings System Check

--

18

Repair the open in CKT 1450 (BLK). Refer to Repairing Damaged Wire Insulation in Wiring Systems.

Is the repair complete?

--

Go to Audible Warnings System Check

--

19

Repair the open or the short to ground in CKT 39 (PNK). Refer to Repairing Damaged Wire Insulation in Wiring Systems.

Is the repair complete?

--

Go to Audible Warnings System Check

--

20

Inspect fuse 1D in the IP fuse block.

Is the fuse OK?

--

Go to Audible Warnings System Check

Go to Step 21

21

Replace fuse 1D in the IP fuse block.

Is the replacement complete?

--

Go to Audible Warnings System Check

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