B143C-MICROPHONE 1 CIRCUIT HIGH

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

When Monitored:
With the ignition on.
Set Condition:
The Radio detects a short to voltage on the (X712) Microphone 1 IN (+) circuit.

Possible Causes
(X712) MICROPHONE 1 IN (+) CIRCUITS SHORTED TO VOLTAGE
HANDS FREE MICROPHONE
RADIO

1. CHECK FOR ACTIVE DTC

NOTE: Verify the connection of the Hands Free Microphone harness connector.

1.	Turn the ignition on.

2.	With the scan tool, read the active DTCs.

Does the scan tool display B143C-MICROPHONE 1 CIRCUIT HIGH as active?

Yes

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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

2. CHECK THE HANDS FREE MICROPHONE

1.	Turn the ignition off.

2.	Disconnect the Hands Free Microphone 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

Replace the Hands Free Microphone in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

3. CHECK THE (X712) MICROPHONE 1 IN (+) CIRCUIT FOR A SHORT TO VOLTAGE

1.	Turn the ignition off.

2.	Disconnect the Radio C1 harness connector.

3.	Turn the ignition on.

4.	Measure the voltage between ground and the (X712) Microphone 1 IN (+) circuit.

Is the voltage above 1.0 volt?

Yes

Repair the (X712) Microphone 1 IN (+) circuit for a short to voltage.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

Replace the Radio in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).