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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Audio (Radio) - Electrical Diagnostics >> DTC Troubleshooting >> B143A- Microphone 1 Circuit Performance >> Diagnostic Test

Diagnostic Test

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

      Does the scan tool display B143A- MICROPHONE 1 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. Refer to 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 B143A- MICROPHONE 1 CIRCUIT PERFORMANCE 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 .
  3. CHECK THE (X712) MICROPHONE 1 IN (+) AND (X792) MICROPHONE IN (-) CIRCUITS FOR A SHORT TO GROUND 
    Fig 1: Checking Microphone 1 In (+) And Microphone In (-) Circuits For A Short To Ground
    GC0139330Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Radio C1 harness connector.
    3. Measure the resistance between ground and the (X712) Microphone 1 IN (+) circuit.
    4. Measure the resistance between ground and the (X792) Microphone IN (-) circuit.

      Is the resistance below 10K Ohms?

      Yes 

      • Repair the (X712) Microphone 1 IN circuit or the (X792) Microphone IN (-) circuit for short to ground.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  4
  4. CHECK THE (X712) MICROPHONE 1 IN (+) AND THE (X792) MICROPHONE IN (-) CIRCUITS FOR A SHORT TO VOLTAGE 
    Fig 2: Checking Microphone 1 In (+) And The Microphone In (-) Circuits For A Short To Voltage
    GC0139331Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition on.
    2. Measure the voltage between ground and the (X712) Microphone 1 IN (+) circuit.
    3. Measure the voltage between ground and the (X792) Microphone 1 IN (-) circuit.

      Is the voltage above 1.0 volt?

      Yes 

      • Repair the (X712) Microphone 1 IN (+) circuit or the (X792) Microphone 1 IN (-) circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  5
  5. CHECK THE (X712) MICROPHONE 1 IN (+) CIRCUIT FOR AN OPEN 
    Fig 3: Checking Microphone 1 In (+) Circuit For An Open
    GC0139332Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Measure the resistance of the (X712) Microphone 1 IN (+) circuit.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (X712) Microphone 1 IN (+) or the (X792) Microphone IN (-) circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  6. CHECK THE (X792) MICROPHONE 1 IN (-) CIRCUIT FOR AN OPEN 
    Fig 4: Checking Microphone 1 In (-) Circuit For An Open
    GC0139333Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (X792) Microphone IN (-) circuit.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Replace the Radio in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Repair the (X792) Microphone IN (-) circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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