Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
Circuit/System Description
The security indicator acts as a status indicator for the content theft deterrent (CTD) system when the ignition if OFF and a fault indicator for the immobilizer system with the ignition ON. When either the body control module (BCM) or theft deterrent module (TDM) requires the security indicator to be illuminated, a serial data message is sent to the instrument panel cluster (IPC), which will illuminate the indicator.
Reference Information
Schematic Reference
Theft Deterrent System Schematics
Connector End View Reference
Description and Operation
Content Theft Deterrent (CTD) Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, perform the scan tool IPC display test. The security indicator illuminate when IPC display is commanded ON.
Circuit/System Testing
- Ignition OFF, disconnect the C3 harness connector at the BCM.
- Ignition ON, verify the security indicator is not illuminated.
- Ignition OFF, install a 3 amp fused jumper wire between the control circuit terminal 7 and ground.
- Ignition ON, verify the security indicator is illuminated.
- If all circuits test normal, replace the BCM
| ⇒ | If indicator is illuminated, test the circuit for a short to ground. If circuit tests normal, relpace the IPC. |
| ⇒ | If indicator does not illuminate, test the circuit for an open/high resistance. If circuit tests normal, replace the IPC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for IPC and BCM replacement, setup and programming.
