GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Caprice WM 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 Bluetooth Malfunction

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 provide an overview of each diagnostic category.

Circuit/System Description

The Bluetooth Module is a cellular device that is powered by a fused, battery positive, voltage circuit and allows a cordless link between a cellular phone and the Bluetooth car kit. The Bluetooth Module is not connected to serial data. It communicates with the cellular telephone via low-power radio waves. Due to the low power of the signal, approximately 1 milliwatt, a cellular telephone must be within 10 meters (32 feet) of the vehicle's Bluetooth Module to identify it and so that pairing between the cellular telephone and the Bluetooth car kit can take place.

In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the Bluetooth ® functionality of their phone.

Diagnostic Aids
    • The purpose of this diagnostic is to verify the ability of the Bluetooth module to pair and connect to a Bluetooth ® device.
    • The Bluetooth system cannot be diagnosed using Tech 2, however it is possible to carry out a self-test on the system. To carry out the test press the Phone button on the steering wheel remote control 4 times consecutively with the ignition on. If the Blue tooth module is functioning correctly a series of notes will be played through the audio system. This tests that the Blue Tooth module is present and functioning and tests the output of the Blue Tooth module through the audio system. This test cannot be performed while a Blue Tooth phone is paired with the vehicle

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. Turn OFF bluetooth on all of the cell phones that are paired with the vehicle.
  2. Ignition ON, press the bluetooth button 4 times consecutively. Verify that a series of chimes are heard clearly through the radio.
    3. ⇒If there was no audible tone heard, refer to Circuit/System Testing - Button Malfunction
    ⇒If the audio was distorted, refer to Circuit/System Testing - Audio Distortion
  3. Turn ON the bluetooth function for the cell phone that will be paired with the vehicle.
  4. Follow the instructions provided in the Vehicle Owners Manual and cell phones manual for pairing. Verify successful pairing with the cell phone.
    5. ⇒If pairing is not successful, repeat the pairing process. If pairing is still not successful, replace the Bluetooth module.
  5. Refer to Diagnostic Aids.

Circuit/System Testing

Button Malfunction

  1. Ignition ON, while depressing the Bluetooth button on the steering wheel control switches, observe the Instrument Panel Cluster (IPC) and verify the illumination of the phone symbol.
    2. ⇒If the symbol does not illuminate, refer to Steering Wheel Controls Malfunction
  2. Ignition OFF, disconnect the harness connector at the Bluetooth module.
  3. Test for less than 10 Ω between the ground circuit terminal 15 and ground.
    4. ⇒If greater than specified range, test the circuit for an open/high resistance.
  4. Test for B+ between the B+ circuit terminal 16 and ground.
    5. ⇒If less than specified range, test the circuit for a short to ground or an open/high resistance.
  5. Ignition ON, test for less than 1V between the bluetooth signal circuit terminal 6 and ground.
    6. ⇒If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the IPC.
  6. Ignition ON, test for infinite resistance between the bluetooth signal circuit terminal 6 and ground.
    7. ⇒If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the IPC.
  7. Ignition ON, while pressing the bluetooth button on the steering wheel, test for less than 10 Ω between the bluetooth signal circuit terminal 6 and ground.
    8. ⇒If greater than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the IPC.
  8. If all circuits test normal, replace the Bluetooth module.

Audio Distortion

  1. Ignition OFF, disconnect the X4 harness connector at the radio.
  2. Ignition ON, press the bluetooth button 4 times consecutively and test for a varying mV A/C voltage between the following signal circuit terminals listed below and ground.
    3. • telephone audio signal (+) circuit terminal 9
    • telephone audio signal (-) circuit terminal 1
    ⇒If the varying mV A/C voltage is not present, test the circuit for a short to voltage, short to ground, or for an open/high resistance. If the circuits test normal, replace the bluetooth module.
  3. Ignition ON, press the bluetooth button 4 times consecutively and test for less than 10 Ω between the mute signal circuit terminal 10 and ground.
    4. ⇒If greater then specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the bluetooth module.
  4. If all circuits test normal, replace the radio.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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