*NO RESPONSE FROM HFM (HANDS FREE MODULE)

For a complete wiring diagram Refer to Section 8W.

Possible Causes

(Z530) GROUND CIRCUIT OPEN

(A908) FUSED B(+) CIRCUIT OPEN

(D25) PCI BUS CIRCUIT OPEN

RADIO

HANDS FREE MODULE (HFM)

Diagnostic Test

1.ESTABLISH COMMUNICATION WITH RADIO ON PCI BUS

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

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

Perform the appropriate no response test. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)

2.(Z530) GROUND CIRCUIT OPEN

Does the test light illuminate brightly?

Yes

Go To 3

Repair the (Z530) Ground circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

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

Does the test light illuminate brightly?

Yes

Go To 4

Repair the (A908) Fused B(+) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

4.(D25) PCI BUS CIRCUIT OPEN

Is the resistance below 5.0 ohms?

Yes

Replace the Hands Free Module in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Repair the (D25) PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).