Radio

B143F-MICROPHONE 2 CIRCUIT HIGH







- 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 Rearview Mirror harness connector.
3. Turn the ignition on.
4. With the scan tool, read the active DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 3

No

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

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




1. Turn the ignition off.
2. Disconnect the Radio C2 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (X722) Microphone 2 IN (+) circuit.

Is the voltage above 1.0 volt?

Yes

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

No

- Go To 4

4. (X722) MICROPHONE 2 IN (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Measure the resistance of the (X722) Microphone 2 IN (+) circuit between the Radio C2 connector and the inside rearview mirror connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the Radio.
- Perform the BODY VERIFICATION TEST. Body Verification Test

No

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