For 1990-2009 cars

Important: The following steps must be completed before using the symptom table.

Important: The Bluetooth Module is not connected to the GMLAN system.

1. Perform the Diagnostic System Check - Vehicle , before using the Symptom Tables in order to verify that all of the following are true:

• | There are no DTCs set.

• | The control modules can communicate via the serial data link.

2. Review the system operation in order to familiarise yourself with the system functions. Refer to Cellular Telephone Description and Operation in Cellular Communication.

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. Refer to Checking Aftermarket Accessories .

• | Inspect for easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

### Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

### Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• | Microphone Inoperative - Caller Cannot Be Heard

• | Cellular Telephone Will Not Pair Up With Bluetooth Car Kit

• | Cellular Telephone Will Not Connect To Bluetooth Car Kit

• | Voice Recognition Inoperative