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Home >> Jeep >> 2016 >> Compass Sport SE, 2.0L Eng VIN A >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> (Hands Free Module (HFM) - Electrical Diagnostics) >> DTC Troubleshooting >> DTC B143B: -Microphone 1 Circuit Low >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR ACTIVE DTC 
    1. With the scan tool, read the active DTCs.
    2. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
    3. Attempt to make a phone call with the system.
    4. With the scan tool, read the active DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  2

      No 

      • If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  2. INSIDE REARVIEW MIRROR 
    Fig 1: Inside Rearview Mirror Connector
    GC0099688Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Inside Rearview Mirror C2 harness connector.
    3. Turn the ignition on.
    4. With the scan tool, read the DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  3

      No 

  3. (X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking Microphone 1 In (+) Circuit For Short To Ground
    GC0099689Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Hands Free Module harness connector.
    3. Measure the resistance between ground and the (X712) Microphone 1 IN (+) circuit.

      Is the resistance below 10K ohms?

      Yes 

      No