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Home >> Fiat >> 2015 >> 500L Pop, Standard Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> (Audio (Radio) - Electrical Diagnostics - 500L) >> DTC Troubleshooting >> B143A-11-Microphone 1 - Circuit Short To Ground >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Verify the connection of the Microphone harness connector.

    1. Ignition on, engine not running.
    2. With the scan tool, read the DTCs.

      Does the scan tool display: B143A-11-MICROPHONE 1 - CIRCUIT SHORT TO GROUND 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 BODY VERIFICATION TEST .
  2. CHECK THE MICROPHONE 
    1. Turn the ignition off.
    2. Disconnect the Microphone harness connector.
    3. Ignition on, engine not running.
    4. Wait 10 seconds.
    5. With the scan tool, read the active DTCs.

      Does the scan tool display: B143A-11-MICROPHONE 1 - CIRCUIT SHORT TO GROUND as active?

      Yes 

      • Go To  3

      No 

      • Replace the Microphone in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  3. CHECK THE (X712) MICROPHONE 1 IN (+) CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the Radio harness connector.
    3. Ignition on, engine not running.
    4. Measure the resistance between ground and the (X712) Microphone 1 IN (+) circuit.

      Is the resistance below 5 Ohms?

      Yes 

      • Repair the short to ground in the (X712) Microphone 1 IN (+) circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (X792) MICROPHONE 1 IN (-) CIRCUIT FOR A SHORT TO GROUND 
    1. Measure the resistance between ground and the (X792) Microphone 1 IN (-) circuit.

      Is the resistance below 5 Ohms?

      Yes 

      • Repair the short to ground in the (X792) Microphone 1 IN (-) circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

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