For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Theft Deterrent System Connector End Views DEFINITION: The status of the security indicator never changes and the security indicator 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 | Replace the theft deterrent control module. Refer to Theft Deterrent Module Replacement . Did you complete the replacement? | Go to Step 4 | --
3 | Important: Perform the program procedure for the intelligent switching unit (ISU). Replace the ISU. Did you complete the replacement? | Go to Step 4 | --
4 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3