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Pinpoint Test D: The Audio System Illumination Is Inoperative

  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: Measuring Voltage Between Audio Unit C290-1, Circuit 19 Harness Side And Ground
      G03902534Courtesy 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: Measuring Voltage Between Audio Unit C240A-3, Circuit 19 Harness Side And Ground
      G03902535Courtesy 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: Measuring Voltage Between Audio Unit C229A-4, Circuit 19 Harness Side And Ground
      G03902536Courtesy 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: Measuring Resistance Between Audio Unit C290-2, Circuit 57 Harness Side And Ground
      G03902537Courtesy 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: Measuring Resistance Between Audio Unit C240A-4, Circuit 57 Harness Side And Ground
      G03902538Courtesy 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: Measuring Resistance Between Audio Unit C229A-2, Circuit 57 Harness Side And Ground
      G03902539Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new audio unit. REFER to AUDIO UNIT . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
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