For 1990-2009 cars

### 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 provides an overview of each diagnostic category.

### DTC Descriptor

DTC B0983 00: Security System Indicator 2 Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Security Indicator Control | B0983 | B0983 | B0983 | --

### Circuit/System Description

The security indicator is controlled by the body control module (BCM) based on commands from the immobilizer system or the content theft deterrent (CTD) system. With the ignition OFF, the security indicator is commanded by the CTD system. With the ignition ON, the security indicator is commanded by the immobilizer system.

The security indicator is located in the instrument panel cluster (IPC) and is supplied B+ at all times. When the immobilizer or CTD system requests the indicator be commanded ON, the BCM grounds the security indicator control circuit, illuminating the indicator.

### Conditions for Running the DTC

The security indicator is commanded ON.

### Conditions for Setting the DTC

The BCM detects a short to voltage, short to ground, or an open/high resistance on the security indicator control circuit.

### Action Taken When the DTC Sets

The security indicator is disabled.

### Conditions for Clearing the DTC

• | A current DTC will clear when the condition for setting the DTC is no longer present.

• | A history DTC will be cleared after 100 malfunction-free ignition cycles.

### Reference Information

#### Schematic Reference

Theft Deterrent System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Content Theft Deterrent (CTD) Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Arm the CTD system. The security indicator should illuminate and/or flash during the arming sequence.

### Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the BCM.
2. Ignition ON, verify the security indicator is not illuminated.

⇒ | If the security indicator is illuminated, test the control circuit terminal 7 for a short to ground. If the circuit tests normal, replace the IPC.

3. Install a 10A fused jumper wire between the control circuit terminal 7 and ground. Verify the security indicator is illuminated.

⇒ | If the security indicator is not illuminated, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.

4. If all circuits test normal, replace the BCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM or IPC replacement, setup, and programming