GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Audible Warnings System Check?

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Go to Step 2

Go to Diagnostic System Check - Audible Warnings

2

  1. Disconnect the multi-function alarm module connector.
  2. Place the key in the ignition cylinder.
  3. Connect a test lamp between connector C2 terminal D and connector C1 terminal E.

Did the test light illuminate?

--

Go to Step 3

Go to Step 10

3

  1. Connect a test lamp between connector C2 terminal D and connector C1 terminal E.
  2. Remove the key from the ignition cylinder.

Did the test light illuminate?

--

Go to Step 11

Go to Step 4

4

  1. Connect a test lamp between connector C2 terminal D and connector C1 terminal E.
  2. Open the left hand front door.

Did the test light illuminate?

--

Go to Step 5

Go to Step 12

5

  1. Connect a test lamp between connector C2 terminal D and connector C1 terminal H.
  2. Close the left hand front door.

Did the test light illuminate?

--

Go to Step 6

Go to Step 13

6

  1. Connect a test lamp between connector C2 terminal D and connector C1 terminal G.
  2. Open the right hand front door.

Did the test lamp illuminate?

--

Go to Step 7

Go to Step 14

7

  1. Connect a test lamp between connector C2 terminal D and connector C1 terminal G.
  2. Close the right hand front door.

Did the test light illuminate?

--

Go to Step 8

Go to Step 15

8

  1. Turn the ignition switch to RUN.
  2. Connect a test lamp between connector C1 terminal M and ground.

Did the test light illuminate?

--

Go to Step 9

Go to Step 16

9

Replace the multi-function alarm module. Refer to Multifunction Alarm Module Replacement.

Did you complete the repair?

--

System OK

--

10

Inspect for an open in CKT 80 and CKT 150 at the ignition switch.

Did you find and repair a condition?

--

System OK

Go to Step 17

11

Inpect CKT 80 for a short to ground.

Did you find and correct a condition?

--

System OK

Go to Step 17

12

Inspect CKT 394 and CKT 150 for an open.

Did you find and repair a condition?

--

System OK

Go to Step 18

13

Inspect CKT 394 for a short to ground.

Did you find and repair a condition?

--

System OK

Go to Step 18

14

Inspect CKT 395 and CKT 250 for an open.

Did you find and repair a condition?

--

System OK

Go to Step 19

15

Inspect CKT 395 for a short to ground.

Did you find and repair a condition?

--

System OK

Go to Step 19

16

Repair an open in CKT 39.

Did you find and repair a condition?

--

System OK

--

17

Replace the ignition switch. Refer to Ignition Switch Replacement.

Did you complete the repair?

--

System OK

--

18

Replace the left hand front door handle. Refer to Outside Handle and Lock Cylinder Replacement or Door Inside Handle Replacement in Doors.

Did you complete the repair?

--

System OK

--

19

Replace the right hand front door handle. Refer to Outside Handle and Lock Cylinder Replacement or Door Inside Handle Replacement in Doors.

Did you complete the repair?

--

System OK

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