GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2

Does the Content Theft Deterrent alarm mode system operate normally?

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

Go to Step 3

3

Check for body control module (BCM) diagnostic trouble codes (DTCs). Refer to Diagnostic Trouble Code (DTC) Displaying in Body Control System.

Is DTC 25/35 displayed?

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Go to Step 4

Go to Step 5

4

Important: Perform the set up procedure for the body control module.

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

Did you complete the replacement?

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Go to Step 8

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5

Test for and repair a poor connection at the BCM connector C3 terminal C16. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

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Go to Step 7

Go to Step 6

6

Test for and repair a poor connection at the security LED. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

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Go to Step 7

Go to SECURITY Indicator Inoperative

7

  1. Disconnect the battery.
  2. Re connect the battery.

Did you complete the repair?

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Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3