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 | 1 | 1 | B3794 08
Cruise Control Switch Signal | 1 | B3794 08 | 1 | B3794 08 | B3794 08
Ground | -- | 1 | 1 | -- | --
1. Cruise Control Malfunction

### Circuit/System Description

The cruise control switch contains an LED that illuminates to indicate the cruise control system has been switched ON. Voltage is applied through the ON/OFF switch to the LED when the switch is pressed. Pressing the switch again opens the switch and the lamp turns OFF. The body control module (BCM) monitors the cruise control indicator 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

Ignition ON, observe the cruise control indicator while applying the cruise ON/OFF switch. The indicator should turn ON and OFF accordingly with the applied switch.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal 7 and ground.

⇒ | If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, test for B+ between the B+ circuit terminal 4 and ground.

⇒ | If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Test for B+ between the B+ circuit terminal 4 and the signal circuit terminal 5.

⇒ | If less than the specified value, test the circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

5. Ignition OFF, disconnect the X2 harness connector at the BCM.
6. Test for infinite resistance between the signal circuit terminal 5 and ground.

⇒ | If less than the specified value, test the signal circuit for a short to ground.

7. If all circuits test normal, test or replace the steering wheel control 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