Hands Free Module

B143E-MICROPHONE 2 CIRCUIT LOW





For a complete wiring diagram consult Diagrams/Electrical.


- When Monitored:
With the ignition on.

- Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.








Diagnostic Test


1. CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's.
Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 30 seconds per cycle.
Attempt to make a phone call with the system.
With the scan tool, read the active DTC's.
Does the scan tool display this DTC as active?

Yes


- Go To 2


No


- If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.




2. INSIDE REARVIEW MIRROR
Turn the ignition off.
Disconnect the Inside Rearview Mirror harness connector.
Turn the ignition on.
With the scan tool, read the DTC's.
Does the scan tool display this DTC as active?

Yes


- Go To 3


No


- Replace the Inside Rearview Mirror.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




3. (X722) MICROPHONE 2 IN (+) CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Hands Free Module C1 harness connector.
Measure the resistance between ground and the (X722) Microphone 2 circuit.
Is the resistance below 10K ohms?

Yes


- Repair the (X722) Microphone 2 circuit for short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test


No


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