For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Component Connector End Views DEFINITION: The status of the security indicator never changes and the security indicator never illuminates.
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Turn OFF the ignition.
2. Disconnect the intelligent switching unit (ISU) PE3 connector.
3. Connect a 3-A fused jumper wire between the security indicator control circuit and ground.
4. Turn ON the ignition, with the engine OFF.

Is the security indicator ON?

Go to Step 5

Go to Step 3

3 | Test the security indicator control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 7 | Go to Step 4
4 | Replace the security indicator. Refer to LED Indicator Replacement - Vehicle Security System . Did you complete the replacement? | Go to Step 7 | --
5 | Test for a poor connection at the ISU. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 7 | Go to Step 6
6 | Important: Perform the program procedure for the ISU. Replace the ISU. Did you complete the replacement? | Go to Step 7 | --
7 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2