B143B-MICROPHONE 1 CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible Causes

(X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND

INSIDE REARVIEW MIRROR

HANDS FREE MODULE

1.CHECK FOR ACTIVE DTC

Does the scan tool display this DTC as active?

Yes

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

Does the scan tool display this DTC as active?

Yes

Replace the Inside Rearview Mirror in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)

3.(X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND

Is the resistance below 10K ohms?

Yes

Repair the (X712) Microphone 1 circuit for short to ground.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)

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