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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1017 (Instrument Cluster System And Panel Illumination (F250-F550)) >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> 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 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. 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 CIRCUIT 19 (LB/RD) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Audio Unit C290a
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
    • Measure the voltage between the audio unit C290a-3, circuit 19 (LB/RD), harness side and ground.
      • Fig 1: Checking Circuit 19 (LB/RD) For Open
      GF0008149Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  D2.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  2. D2 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Measure the resistance between the audio unit C290a-4, circuit 57 (BK), harness side and ground.
      • Fig 2: Checking Circuit 57 (BK) For Open
      GF0008150Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : REMOVE the audio unit. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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