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

Bluetooth ® wireless technology is a short-range communications technology intended to replace the cables connecting portable and/or fixed devices while maintaining high levels of security. Only vehicles with steering wheel controls will have Bluetooth ® functionality. In order to utilize the vehicle’s Bluetooth ® system, a Bluetooth ® equipped cellular phone is required. The bluetooth module is not connected to serial data and will not set DTCs. When a Bluetooth button keypress is made, the bluetooth module pulls the celular telephone signal to ground to mute all radio functions and transmit cellular telephone originated audio. After the audio system is muted, the cellular telephone signals are transmitted to the audio system on the cellular telephone voice signal circuit, and returned to the module on the cellular telephone voice low reference circuit.

### Reference Information

#### Schematic Reference

Cellular Telephone Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Cellular Telephone 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, press Bluetooth button and make a phone call. Verify that your voice cannot be heard clearly by the person called.

⇒ | If your voice can not be heard clearly, refer to Microphone Inoperative - Caller Cannot Be Heard

2. Make sure the background noise is minimal. Press the Bluetooth button. Attempt to operate the bluetooth system using multiple different voice commands. Verify the system responds appropriately to all voice commands.

⇒ | If the Bluetooth system does not respond to any voice commands, replace the Bluetooth module.

3. Record voice commands via the Bluetooth car kit. Refer the cellular telephone's owner handbook.

⇒ | If voice commands cannot be recorded via the Bluetooth car kit, the cellular telephone may not be fully compatible with the Bluetooth car kit.

### Repair Instructions

Perform the Diagnostic Repair Verification.

Control Module References for Bluetooth module replacement, setup, and programming.