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Diagnostic Test

WARNING: This page is about a different car, the 2012 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Verify the connection of the Rearview Mirror 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.
      • Refer to STANDARD PROCEDURE  and perform the BODY VERIFICATION TEST.
  2. CHECK THE INSIDE REARVIEW MIRROR 
    1. Turn the ignition off.
    2. Disconnect the Inside Rearview Mirror 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 Inside Rearview Mirror in accordance with the Service Information.
      • Refer to STANDARD PROCEDURE  and perform the BODY VERIFICATION TEST.
  3. CHECK THE (X712) MICROPHONE 1 IN (+) CIRCUIT FOR AN OPEN 
    1. Turn the ignition off.
    2. Disconnect the TGW harness connector.
    3. Measure the resistance of the (X712) Microphone 1 IN (+) circuit between the Inside Rearview Mirror and TGW harness connectors.

      Is the resistance below 5 Ohms?

      Yes 

      • Go To  4.

      No 

      • Repair the (X712) Microphone 1 IN (+) circuit for an open.
      • Refer to STANDARD PROCEDURE  and perform the 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 TGW harness connectors.

      Is the resistance below 5 Ohms?

      Yes 

      • Replace the TGW in accordance with the Service Information.
      • Refer to STANDARD PROCEDURE  and perform the BODY VERIFICATION TEST.

      No 

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