Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

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 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 FOR VOLTAGE AT THE HANDS FREE MICROPHONE

Fig 1: Measuring Voltage Between Microphone Feed Circuit & Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Hands Free Microphone harness connector.
3. Turn the ignition on.
4. Measure the voltage between the (X793) Microphone Feed circuit and ground.
  Is the voltage above 10.0 volts?
  
  Yes
  - Go To 5
  No
  - Go To 3
CHECK FOR VOLTAGE AT THE RADIO

Fig 2: Checking For Voltage At The Radio
Courtesy of CHRYSLER GROUP, LLC
1. While back probing, measure the voltage between the (X793) Microphone Feed circuit and ground at the Radio C1 harness connector.
  NOTE:
  The graphic shows the connector for reference only. Back probe the harness connector.
  
  Is the voltage above 10.0 volts?
  
  Yes
  - Repair the (X793) Microphone Feed circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
RESTORE THE VEHICLE CONFIGURATION
1. With the scan tool, restore the vehicle configuration.
2. Turn the ignition off, then back on.
3. With the scan tool, read the active DTCs.
  Does the scan tool display B143B-MICROPHONE 1 CIRCUIT LOW as active?
  
  Yes
  - Replace the Radio in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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 3: Hands Free Microphone Harness Connector End View
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 6
  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 4: Measuring Resistance Of Microphone 1 IN (+) Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Radio C1 harness connector.
3. Measure the resistance of the (X712) Microphone 1 IN (+) circuit between the Hands Free Microphone and Radio C1 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 7
CHECK FOR THE (X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND

Fig 5: Measuring Resistance Between Ground & Microphone 1 IN (+) Circuit
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 Radio in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .