No Response From HFM (Hands Free Module)

*NO RESPONSE FROM HFM (HANDS FREE MODULE)





For a complete wiring diagram refer to Diagrams/Electrical.





Diagnostic Test

1. ESTABLISH COMMUNICATION WITH RADIO ON PCI BUS

Turn the ignition on.

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

With the scan tool, select ECU view.

NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

Does the scan tool communicate with the radio?

Yes

- Go To 2

No

- Perform the appropriate no response test.

2. (Z530) GROUND CIRCUIT OPEN





Turn the ignition off.

Disconnect the Hands Free Module C1 harness connector.

Using a 12-volt test light connected to 12-volts, probe the (Z530) ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the (Z530) Ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. (A908) FUSED B(+) CIRCUIT OPEN





Using a 12-volt test light connected to ground, probe the (A908) Fused B(+) circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (A908) Fused B(+) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. (D25) PCI BUS CIRCUIT OPEN





Turn the ignition off.

Disconnect the Hands Free Module C3 harness connector.

Disconnect the Radio C2 harness connector.

Measure the resistance of the (D25) PCI Bus circuit between the Radio C2 harness connector and the Hands Free Module connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the Hands Free Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Repair the (D25) PCI Bus circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test