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Pinpoint Test E: The Subwoofer Is Inoperative (Cd6 Only)

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. E1 CARRY OUT THE SPEAKER WALK-AROUND TEST - CHECK THE SUBWOOFER OPERATION 
    • Key in ON position.
    • Turn on the audio unit.
    • Carry out the speaker walk-around test by pressing preset buttons 3 and 6 simultaneously.
    • Does the subwoofer sound operate correctly? 
    • Yes  : The system is operating OK.
    • No  : GO to E2.
  2. E2 CHECK CIRCUIT 168 (RD/BK) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Subwoofer Amplifier C466.
    • Key in ON position.
    • Turn on the audio unit.
    • Measure the voltage between the subwoofer amplifier C466-1, circuit 168 (RD/BK), harness side and ground.
      Fig 1: Measuring Voltage Between Subwoofer Amplifier C466-1, Circuit 168 (RD/BK), Harness Side And Ground.
      G03902774Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 4.1 volts? 
    • Yes  : GO to E3.
    • No  : GO to  E7.
  3. E3 CHECK CIRCUIT 37 (YE) FOR VOLTAGE 
    • Key in OFF position.
    • Measure the voltage between the subwoofer amplifier C466-6, circuit 37 (YE), harness side and ground.
      Fig 2: Measuring Voltage Between Subwoofer Amplifier C466-6 And Ground
      G03916242Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to E4.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. E4 CHECK CIRCUIT 1204 (BK/OG) FOR AN OPEN 
    • Measure the resistance between the subwoofer amplifier C466-2, circuit 1204 (BK/OG), harness side and ground.
      Fig 3: Measuring Resistance Between Subwoofer Amplifier C466-2 And Ground
      G03902776Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to E5.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. E5 CHECK CIRCUIT 172 (LB/RD) FOR AN OPEN AND A SHORT TO GROUND 
    • Disconnect: Audio Unit C290c.
    • Measure the resistance between the subwoofer amplifier C466-8, circuit 172 (LB/RD), harness side and the audio unit C290c-2, circuit 172 (LB/RD), harness side; and between the subwoofer amplifier C466-8, circuit 172 (LB/RD), harness side and ground.
      Fig 4: Checking Circuit 172 (LB/RD) For An Open And A Short To Ground
      G03930893Courtesy 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? 
    • Yes  : GO to E6.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. E6 CHECK CIRCUIT 167 (BN/OG) FOR AN OPEN AND A SHORT TO GROUND 
    • Measure the resistance between the subwoofer amplifier C466-7, circuit 167 (BN/OG), harness side and the audio unit C290c-1, circuit 167 (BN/OG), harness side; and between the subwoofer amplifier C466-7, circuit 167 (BN/OG), harness side and ground.
      Fig 5: Measuring Resistance Between Subwoofer Amplifier C466-7 And Audio Unit C290c-1
      G03945561Courtesy 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? 
    • Yes  : REMOVE the subwoofer amplifier. REFER to AUDIO UNIT . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  7. E7 CHECK CIRCUIT 168 (RD/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Audio Unit C290c.
    • Measure the resistance between the subwoofer amplifier C466-1, circuit 168 (RD/BK), harness side and the audio unit C290c-4, circuit 168 (RD/BK), harness side.
      Fig 6: Checking Circuit 168 (RD/BK) For An Open
      G03930895Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair.
    • No  : REPAIR the circuit. TEST the system for normal operation.
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