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 Descriptors

DTC B0685 02: Security System Indicator Circuit Short to Ground

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Security Indicator Control | B0685 02 | 1 | 1 | --
1. Security Indicator Malfunction

### Circuit/System Description

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

The security indicator is located in the instrument panel cluster and is supplied B+ at all times. When the immobilizer or content theft deterrent system requests the indicator be commanded ON, the body control module grounds the security indicator control circuit, illuminating the indicator.

### Conditions for Running the DTC

The system voltage is at least 9 V and no more than 16 V.

### Conditions for Setting the DTC

• | The body control module detects a short to ground on the security indicator control circuit.

• | The above condition exist for 1 second.

### Action Taken When the DTC Sets

Security indicator output is disabled

### Conditions for Clearing the DTC

• | A current DTC is cleared when the conditions for setting the DTC are no longer present.

• | A history DTC will clear after 40 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

Ignition ON, command the Security Indicator ON and OFF with a scan tool. The security indicator should turn ON and OFF when changing between the commanded states.

⇒ | If the security indicator does not illuminate, replace the P16 instrument panel cluster.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for body control module or instrument panel cluster replacement, setup, and programming