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Home >> Lincoln >> 2010 >> MKZ FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 415 (Instrument Cluster System And Panel Illumination) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Test D: The Audio System Illumination Is Inoperative >> Pinpoint Test D: The Audio System Illumination Is Inoperative

Pinpoint Test D: The Audio System Illumination Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. D1 CHECK FOR VOLTAGE ON CIRCUIT 19 (LB/RD) 
    • Key in OFF position.
    • Disconnect: Audio Unit C290a (M100CD, CDX6), C240a (MACH 300) or C229a (Navigation).
    • Place the headlamp switch in the PARK position.
    • Move the instrument panel dimmer switch to the full illumination position.
    • If equipped with M100CD or CDX6, measure the voltage between the audio unit C290-1, circuit 19 (LB/RD), harness side and ground.
      Fig 1: Checking For Voltage On Circuit 19 (LB/RD) (1 Of 3)
      G04621698Courtesy of FORD MOTOR CO.
    • If equipped with MACH 300, measure the voltage between the audio unit C240a-3, circuit 19 (LB/RD), harness side and ground.
      Fig 2: Checking For Voltage On Circuit 19 (LB/RD) (2 Of 3)
      G04621699Courtesy of FORD MOTOR CO.
    • If equipped with Navigation, measure the voltage between the audio unit C229a-4, circuit 19 (LB/RD), harness side and ground.
      Fig 3: Checking For Voltage On Circuit 19 (LB/RD) (3 Of 3)
      G04621700Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to D2.

    No  : REPAIR the circuit. TEST the system for normal operation.

  2. D2 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • If equipped with M100CD or CDX6, measure the resistance between the audio unit C290-2, circuit 57 (BK), harness side and ground.
      Fig 4: Checking Circuit 57 (BK) For Open (1 Of 3)
      G04621701Courtesy of FORD MOTOR CO.
    • If equipped with MACH 300, measure the resistance between the audio unit C240a-4, circuit 57 (BK), harness side and ground.
      Fig 5: Checking Circuit 57 (BK) For Open (2 Of 3)
      G04621702Courtesy of FORD MOTOR CO.
    • If equipped with Navigation, measure the resistance between the audio unit C229a-2, circuit 57 (BK), harness side and ground.
      Fig 6: Checking Circuit 57 (BK) For Open (3 Of 3)
      G04621703Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : INSTALL a new audio unit. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.

    No  : REPAIR the circuit. TEST the system for normal operation.

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