B143D

B143D-MICROPHONE 2 CIRCUIT PERFORMANCE





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

- When Monitored:
With the ignition on.

- Set Condition:
The Radio detects a fault in any of the microphone 2 circuits.





1. CHECK FOR ACTIVE DTCs
1. Turn the ignition on.
2. With the scan tool, read the active DTCs.

Does the scan tool display B143D- MICROPHONE 2 CIRCUIT PERFORMANCE as active?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE INSIDE REARVIEW MIRROR




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

Does the scan tool display B143D- MICROPHONE 2 CIRCUIT PERFORMANCE as active?

Yes

- Go To 3

No

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

3. CHECK THE (X722) MICROPHONE 2 IN (+) CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the Radio C1 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

- Go To 4

4. CHECK THE (X722) MICROPHONE CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage of the (X722) Microphone circuit.

Is there any voltage present?

Yes

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

No

- Go To 5

5. CHECK THE (X722) MICROPHONE 2 IN (+) FOR AN OPEN CIRCUIT




1. Turn the ignition off.
2. Measure the resistance of the (X722) Microphone 2 IN (+) circuit.

Is the resistance below 5.0 Ohms?

Yes

- Replace the Radio. Radio - Removal.
- 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.