Pinpoint Test I: The Video System Is Inoperative

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

I1 CHECK THE VOLTAGE AT THE DIGITAL VERSATILE DISC (DVD) UNIT
- Disconnect: DVD Unit C949.
- Key in ON position.
- Measure the voltage between the DVD unit C949-1, circuit 1001 (WH/YE), harness side and ground.
  
  Fig 1: Checking Voltage At Digital Versatile Disc (DVD) Unit
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes

GO to I2.

No

REPAIR the circuit (s) in question. TEST the system for normal operation.
I2 CHECK THE GROUND CIRCUITS TO THE DVD UNIT
- Key in OFF position.
- Measure the resistance between the DVD unit C949-3, circuit 1205 (BK), harness side and ground; and between the DVD unit C949-16, circuit 1203 (BK/LB), harness side and ground.
  
  Fig 2: Checking Ground Circuits To DVD Unit
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes

GO to I3.

No

REPAIR the circuit (s) in question. TEST the system for normal operation.
I3 CHECK THE WAKE UP SIGNAL TO THE DVD UNIT
- Key in ON position.
- Turn on the audio unit.
- Measure the voltage between the DVD unit C949-20, circuit 1068 (LG/BK), harness side and ground.
  
  Fig 3: Checking Wake Up Signal To DVD Unit
  Courtesy of FORD MOTOR CO.
- Is there voltage present with the audio unit on?
Yes

GO to I4.

No

REPAIR the circuit (s) in question. TEST the system for normal operation.
I4 CHECK THE COMMUNICATION CIRCUITS BETWEEN THE DVD UNIT AND THE AUDIO UNIT
- Key in OFF position.
- Measure the resistance between the DVD unit C949-18, circuit 832 (LB/PK), harness side and audio unit C240a-6 (DM100), or C290b-7 (CD6), circuit 832 (LB/PK), harness side and ground; and between the DVD unit C949-19, circuit 833 (TN), harness side and audio unit C240a-7 (DM100), or C290b-8 (CD6), circuit 833 (TN), harness side and ground.
  
  Fig 4: Checking Communication Circuits Between DVD Unit And Audio Unit
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms between the DVD unit and the audio unit and greater than 10,000 ohms between the audio unit and ground?
Yes

INSTALL a new DVD unit. REFER to DIGITAL VERSATILE DISC (DVD) PLAYER . TEST the system for normal operation.

No

REPAIR the circuit (s) in question. TEST the system for normal operation.