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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 432 (Entertainment System) >> Diagnosis And Testing >> Entertainment System >> Symptom Chart >> PINPOINT TEST I: Loud Popping Sound When Cycling The Ignition-CDX6 And Navigation Audio Unit Only >> Pinpoint Test I: Loud Popping Sound When Cycling The Ignition

Pinpoint Test I: Loud Popping Sound When Cycling The Ignition

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. I1 CHECK CIRCUIT 7-MD19 (YE/RD) FOR POWER 
    • Key in OFF position.
    • Disconnect: Subwoofer Amplifier C466a.
    • Key in ON position.
      • NOTE: There should be voltage present when the ignition is in the ACC and ON positions, but not when the ignition is in the OFF position.
    • Measure the voltage between the subwoofer amplifier C466a-1, circuit 7-MD19 (YE/RD), harness side and ground, while cycling the ignition from OFF to ACC to ON to ACC to OFF. Pause in the ACC and ON positions to allow for the audio unit to power up and initialize.
      Fig 1: Checking Circuit 7-MD19 (YE/RD) For Power
      G03202666Courtesy of FORD MOTOR CO.
    • Is the voltage present as expected? 
    1. Yes  : GO to I2.
    2. No  : GO to  I3.
  2. I2 SUBSTITUTE A SUBWOOFER AMPLIFIER 
    • Key in OFF position.
    • Substitute a known good subwoofer amplifier.
    • Cycle the ignition from OFF to ACC to ON to ACC to OFF.
    • Is the popping eliminated? 
    1. Yes  : REMOVE the subwoofer amplifier and SEND it to an authorized audio system repair facility. REFER to SUBWOOFER AMPLIFIER . TEST the system for normal operation.
    2. No  : GO to I3.
  3. I3 CHECK CIRCUIT 7-MD19 (YE-RD) FOR POWER WITHOUT AUDIO UNIT ON AND IGNITION OFF 
    • Key in OFF position.
    • Disconnect: Audio Unit C290a (CDX6).
    • Disconnect: Audio Unit C2253d (navigation audio unit).
    • Measure the voltage between the subwoofer amplifier C466a-1, circuit 7-MD19 (YE/RD), harness side and ground.
      Fig 2: Measuring Voltage Between Subwoofer Amplifier C466A-1, Circuit 7-MD19 (YE/RD), Harness Side And Ground
      G03202667Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.
    2. No  : GO to I4.
  4. I4 CHECK THE ENABLE CIRCUIT TO THE SUBWOOFER AMPLIFIER 
    • For CDX6, Measure the resistance between the subwoofer amplifier C466-1, circuit 7-MD19 (YE/RD), harness side and the audio unit C290a-4, circuit 7-MD19 (YE/RD), harness side: and between the subwoofer amplifier C466-1, circuit 7-MD19 (YE/RD), harness side and ground.
      Fig 3: Measuring Resistance Between C466-1, Circuit 7-MD19 (YE/RD), Harness Side And C290A-4
      G03202668Courtesy of FORD MOTOR CO.
    • For navigation audio unit, measure the resistance between the subwoofer amplifier C466a-1, circuit 7-MD27 (YE/RD), harness side and the audio unit C2253d-9, circuit 10-MD27 (GY/WH), harness side: and between the subwoofer amplifier C466a-1, circuit 7-MD19 (YE/RD) harness side and ground.
      Fig 4: Measuring Resistance Between C466A-1, Circuit 7-MD27 (YE/RD), Harness Side And C2253D-9
      G03202669Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the subwoofer amplifier and the audio unit, and greater than 10,000 ohms between the subwoofer amplifier and ground? 
    1. Yes  : GO to I5.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  5. I5 CHECK VOLTAGE ON ENABLE CIRCUIT WITH IGNITION ON 
    • Key in ON position.
    • Measure the voltage between the subwoofer amplifier C466a-1, circuit 7-MD19 (YE/RD), harness side and ground.
      Fig 5: Checking Voltage On Enable Circuit With Ignition On
      G03202670Courtesy of FORD MOTOR CO.
    • Is any 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 audio system repair facility. REFER to AUDIO UNIT . TEST the system for normal operation.
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