B143E

B143E-MICROPHONE 2 CIRCUIT LOW





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the ignition on.

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





1. CHECK FOR ACTIVE DTC
1. With the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
3. Attempt to make a phone call with the system.
4. With the scan tool, read the active DTCs.

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.
- Perform the BODY VERIFICATION TEST. Body Verification Test

2. INSIDE REARVIEW MIRROR




1. Turn the ignition off.
2. Disconnect the Inside Rearview Mirror C2 harness connector.
3. Turn the ignition on.
4. With the scan tool, read the DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 3

No

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

3. (X722) MICROPHONE 2 IN (+) CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the Hands Free Module harness connector.
3. Measure the resistance between ground and the (X722) Microphone 2 IN (+) circuit.

Is the resistance below 10K ohms?

Yes

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

No

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