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.

### Diagnostic Fault Information

Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance
--- | --- | --- | --- | --- | ---
B+ | 1 | B3794 08, B3794 6 | 1 | 1 | B3794 08, B3794 61
Cruise Control Switch Signal | 1 | B3794 08, B3794 6 | 1 | B3794 08 | B3794 08, B3794 61
Cruise Control Indicator Low Reference | -- | 2 | 2 | 2 | --
1. Cruise Control Malfunction 2. Cruise Control Indicator Disabled

### 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. When the cruise on/off switch is pressed OFF, the cruise control switch is open and the signal circuit is high.

### 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 Testing

Important: Refer to DTC B3794 before performing this diagnostic, if this code is set as current or history.

1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch-left.
2. Ignition ON, verify that a test lamp illuminates between the low reference circuit terminal 9 and B+.

⇒ | If the test lamp does not illuminate, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

3. If all circuits test normal, test or replace the steering wheel controls switch-left.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Steering Wheel Control Switch Assembly Replacement

• | Control Module References for BCM replacement, setup, and programming