For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Theft Deterrent System Schematics
1 | Did you perform the Theft Deterrent Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Theft Deterrent
2 |

1. Install the scan tool.
2. Select BODY CONTROL MODULE.
3. Select MISCELLANEOUS TEST from the Output Control menu.
4. Select SECURITY TELLTALE.
5. Press the ON button then press the OFF button and monitor the SECURITY indicator lamp.

Did the SECURITY indicator lamp light?

--

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).
3. Turn ON the ignition, with the engine OFF.
4. Measure the voltage from the control circuit of the BCM module harness connector to a good ground. Refer to Circuit Testing in Wiring Systems.

Does the voltage measure near the specified value?

B+

Go to Step 4

Go to Step 5

4 | Inspect for poor connections at the harness connector of the BCM module. 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 10 | Go to Step 6
5 | Test the control circuit of the BCM module for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 7
6 | Replace the BCM module. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 10 | --
7 | Inspect for poor connections at the harness connector of the IPC. 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 10 | Go to Step 8
8 | Replace the Security indicator bulb. Refer to Instrument Cluster Indicator Lamp Replacement in Instrument Panel, Gages, and Console. Did the replacement bulb correct the condition? | -- | Go to Step 10 | Go to Step 9
9 | Replace the IPC. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | -- | Go to Step 10 | --
10 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2