GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Theft Deterrent Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2

With a scan tool, command the security indicator LED ON.

Does the security indicator LED illuminate?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the body control module (BCM) connector containing the security indicator LED circuit.
  3. Connect a 3 amp fused jumper wire between the security indicator LED supply voltage circuit and a good ground.

Does the SECURITY indicator LED illuminate?

Go to Step 6

Go to Step 4

4

  1. Disconnect the security indicator LED.
  2. Connect a test lamp between the security indicator LED supply voltage circuit and a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 8

5

Test the security indicator LED control circuit for an open or short to battery. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 9

7

Inspect for poor connections at the harness connector of the security indicator LED. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

8

Repair the open or short to ground in the security indicator LED supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

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9

Important: When replacing the BCM, perform the setup procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 11

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10

Replace the security indicator LED. Refer to LED Indicator Replacement - Vehicle Security System .

Did you complete the replacement?

Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3