Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Verify the connection of the Rearview Mirror harness connector.
1. Turn the ignition on.
2. With the scan tool, read the active DTCs.
  Does the scan tool display B143B-MICROPHONE 1 CIRCUIT LOW 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. Refer to STANDARD PROCEDURE .
CHECK THE HANDS FREE MICROPHONE

Fig 1: Measuring Voltage Of The Hands Free Microphone
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Hands Free Microphone harness connector.
3. Connect a jumper wire between the (X793) Microphone Feed and the (X712) Microphone 1 IN (+) circuits.
4. Turn the ignition on.
5. With the scan tool, read the DTCs.
  NOTE:
  DTC B143C-MICROPHONE 1 CIRCUIT HIGH should display as active as a result of this test.
  
  Does the scan tool display B143B-MICROPHONE 1 CIRCUIT LOW as active?
  
  Yes
  - Go To 3
  No
  - Replace the Hands Free Microphone in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR THE (X712) MICROPHONE 1 IN (+) CIRCUIT OPEN

Fig 2: Checking Microphone 1 IN (+) Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Hands Free Module C1 harness connector.
3. Measure the resistance of the (X712) Microphone 1 IN (+) circuit between the Hands Free Microphone and Hands Free Module harness connectors.
  Is the resistance above 10K Ohms?
  
  Yes
  - Repair the (X712) Microphone 1 IN (+) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK FOR THE (X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND

Fig 3: Checking Microphone 1 IN (+) Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (X712) Microphone 1 IN (+) circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (X712) Microphone 1 IN (+) circuit for short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Hands Free Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .