For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Is the security indicator ON at all times? | Go to Step 3 | Go to Step 4
3 | Disconnect the body control module (BCM) connector containing the security indicator control circuit. Does the security indicator remain illuminated? | Go to Step 5 | Go to Step 7
4 |

1. Turn OFF the ignition.
2. Disconnect the BCM connector containing the security indicator control circuit.
3. Ground the security indicator control circuit with a fused jumper wire and appropriate terminal adapter.

Does the security indicator illuminate?

Go to Step 7

Go to Step 6

5 | Test the security indicator control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 8
6 | Test the security indicator control circuit for an open or short to battery. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 8
7 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 9
8 | Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 10
9 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 11 | --
10 | Replace the IPC. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 11 | --
11 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2