B143D-12

B143D-12-MICROPHONE 2 - CIRCUIT SHORT TO BATTERY

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





Theory of Operation

The Radio controls and monitors both the microphone 2 input circuit (+) and the microphone 2 input circuit (-) for a concern. The Radio communicates over the CAN-Interior Bus. The microphone is located in the rearview mirror.

- When Monitored:
With the ignition on.

- Set Condition:
The Radio detects a short to battery voltage on either the Microphone 2 IN (+) circuit or microphone 2 IN (-) circuit for greater than 10 seconds.





Diagnostic Test

1. CHECK FOR AN ACTIVE DTC

NOTE: Verify the connection of the inside rearview mirror harness connector.

1. Ignition on, engine not running.
2. With the scan tool, read the DTCs.

Does the scan tool display: B143D-12-MICROPHONE 2 - CIRCUIT SHORT TO BATTERY 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. Ignition on, engine not running.
4. Wait 10 seconds.
5. With the scan tool, read the active DTCs.

Does the scan tool display: B143D-12-MICROPHONE 2 - CIRCUIT SHORT TO BATTERY as active?

Yes

- Go To 3

No

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

3. CHECK THE (X722) MICROPHONE 2 IN (+) CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Radio harness connector.
3. Ignition on, engine not running.
4. Measure the voltage between the (X722) Microphone 2 In (+) circuit and ground.

Is there any voltage present?

Yes

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

No

- Go To 4

4. CHECK THE (X723) MICROPHONE 2 IN (+) CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Radio harness connector.
3. Ignition on, engine not running.
4. Measure the voltage between the (X723) Microphone 2 IN (-) circuit and ground.

Is there any voltage present?

Yes

- Repair the short to voltage in the (X723) Microphone 2 IN (-) circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

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