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

### Circuit/System Description

The body control module (BCM) monitors the cruise control indicator switch. When the cruise on/off switch is pressed ON, the cruise control switch is closed and the signal circuit is low. The BCM sends a serial data message to the instrument panel cluster (IPC) indicating the status of the cruise control switch.

### Reference Information

#### Schematic Reference

Cruise Control Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Cruise Control 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

1. Ignition ON, perform the Display Test. Verify the cruise control indicator illuminated.

⇒ | If the indicator does not illuminate, replace the IPC.

2. Replace the BCM.

### Repair Instructions

Perform the Diagnostic Repair Verification.

• | Instrument Cluster Replacement.

• | Control Module References for ECM or IPC replacement, setup, and programming.