Pinpoint Test W: The Individual Reversing Lamp Is Inoperative

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

W1 CHECK THE VOLTAGE TO THE INOPERATIVE REVERSING LAMP
- Key in OFF position.
- Apply the parking brake.
- Disconnect: Inoperative Reversing Lamp.
- Key in ON position.
- Select REVERSE.
- Measure the voltage between inoperative reversing lamp C461-3, circuit 140 (BK/PK), harness side and ground.
  
  Fig 1: Checking Voltage To Inoperative Reversing Lamp
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : REPAIR circuit 57 (BK). TEST the system for normal operation.
- No : REPAIR circuit 140 (BK/PK). TEST the system for normal operation.