Pinpoint Test H: The STOPLAMPS Are 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.

H1 CHECK THE VOLTAGE TO THE BRAKE PEDAL POSITION (BPP) SWITCH
- Disconnect: BPP Switch C278.
- Measure the voltage between BPP switch C278-5, circuit 10 (LG/RD), harness side and ground.
  
  Fig 1: Checking Voltage To Brake Pedal Position (BPP) Switch
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to H2.
- No : REPAIR the circuit. TEST the system for normal operation.
H2 CHECK THE BPP SWITCH
- Connect a fused jumper wire (20A) between BPP C278-5, circuit 10 (LG/RD), harness side and BPP C278-4, circuit 511 (LG), harness side.
  
  Fig 2: Checking BPP Switch
  Courtesy of FORD MOTOR CO.
- Do the stoplamps operate?
- Yes : INSTALL a new BPP switch. REFER to LAMP SWITCH - BRAKE PEDAL POSITION (BPP) .
- No : REPAIR circuit 511 (LG). TEST the system for normal operation.