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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-13-Microphone 1 - Circuit Open >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Verify the connection of the Microphone harness connector.

    1. Turn the ignition on.
    2. With the scan tool, read the active DTCs.

      Does the scan tool display: B143A-13-MICROPHONE 1 - CIRCUIT OPEN 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. Connect a jumper wire between the (X792) Microphone 1 IN (-) and the (X712) Microphone 1 IN (+) circuits.
    4. Turn the ignition on.
    5. With the scan tool, read the DTCs.
      NOTE:

      B143A-2B-MICROPHONE 1 - WIRES SHORTED TOGETHER should display as active as a result of this test.

      Does the scan tool display: B143A-13-MICROPHONE 1 - CIRCUIT OPEN 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 AN OPEN 
    1. Turn the ignition off.
    2. Disconnect the RADIO harness connector.
    3. Measure the resistance of the (X712) Microphone 1 IN (+) circuit between the Inside Rearview Mirror and RADIO harness connectors.

      Is the resistance below 5 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (X712) Microphone 1 IN (+) circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  4. CHECK THE (X792) MICROPHONE 1 IN (-) CIRCUIT FOR AN OPEN 
    1. Measure the resistance of the (X792) Microphone 1 IN (-) circuit between the Inside Rearview Mirror and RADIO harness connectors.

      Is the resistance below 5 Ohms?

      Yes 

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

      No 

      • Repair the (X792) Microphone 1 IN (-) circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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