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Pinpoint Test H: Loud Popping Sound When Cycling The Ignition Switch - Tremor

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK CIRCUIT 829 (WH/VT) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Audio Unit Amplifier C3154a.
    • Measure the voltage between the amplifier C3154a pin 9, circuit 829 (WH/VT), harness side and ground.
      Fig 1: Checking Circuit 829 (WH/VT) For Voltage
      G03277148Courtesy of FORD MOTOR CO.
    • Is there voltage present? 
    1. Yes  : GO to I2.
    2. No  : INSTALL a new audio unit amplifier. REFER to AUDIO UNIT .
  2. H2 CHECK CIRCUIT 829 (WH/VT) FOR A SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: Audio Unit C290b.
    • Measure the voltage between the amplifier C3154a pin 9, circuit 829 (WH/VT), harness side and ground.
      Fig 2: Checking Circuit 829 (WH/VT) For A Short To Power
      G03277149Courtesy of FORD MOTOR CO.
    • Is there voltage present? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.
    2. No  : REMOVE the audio unit and SEND it to an authorized repair facility. TEST the system for normal operation.
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