Pinpoint Test P: One Or More Parking, Rear Or License 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.

P1 VERIFY THE INOPERATIVE LAMP(S)
- Key in OFF position.
- Place the headlamp switch in the ON position.
- Verify the inoperative lamp(s).
- Are only all rear lamps or only all front lamps inoperative?
- Yes : If all rear lamps are inoperative, GO to P3.
  If all front lamps are inoperative, GO to P4.
- No : If the signal mirror marker lamp is inoperative, GO to P5.
  All others, GO to P2.
P2 CHECK THE VOLTAGE TO THE INOPERATIVE LAMP(S)
- Disconnect: Inoperative Lamp.
- Measure the voltage between inoperative lamp connector circuit 14 (BN), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes : REPAIR circuit 57 (BK). TEST the system for normal operation.
- No : REPAIR circuit 14 (BN). TEST the system for normal operation.
P3 CHECK CIRCUIT 14 (BN) FOR AN OPEN (REAR LAMPS)
- Place the headlamp switch in the OFF position.
- Disconnect: Central Junction Box (CJB) C270j.
- Place the headlamp switch in the ON position.
- Measure the voltage between central junction box CJB C270j-12, circuit 14 (BN), component side and ground.
  
  Fig 1: Checking Circuit 14 (BN) For Open (Rear Lamps)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : REPAIR circuit 14 (BN). TEST the system for normal operation.
- No : INSTALL a new CJB. TEST the system for normal operation.
P4 CHECK CIRCUIT 14 (BN) FOR AN OPEN (FRONT LAMPS)
- Place the headlamp switch in the OFF position.
- Disconnect: Central Junction Box (CJB) C270h.
- Place the headlamp switch in the ON position.
- Measure the voltage between CJB C270h-3, circuit 14 (BN), component side and ground.
  
  Fig 2: Checking Circuit 14 (BN) For Open (Front Lamps)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : REPAIR circuit 14 (BN). TEST the system for normal operation.
- No : INSTALL a new CJB. TEST the system for normal operation.
P5 CHECK THE SIGNAL MIRROR FOR CORRECT OPERATION
- Key in ON position.
- Place the multifunction switch in the LH and then RH turn positions.
- Do the signal mirrors operate correctly?
- Yes : GO to P6.
- No : REFER to TURN SIGNAL AND HAZARD LAMPS to continue diagnostics for the signal mirror.
P6 CHECK CIRCUIT 14 (BN) FOR AN OPEN (SIGNAL MIRROR MARKER)
- Key in OFF position.
- Place the headlamp switch in the OFF position.
- Disconnect: Inoperative Mirror.
- Place the headlamp switch in the parking lamps ON position.
- Measure the voltage between LH outside rear view mirror C521-7, circuit 14 (BN), harness side and ground; or between RH outside rear view mirror C601-7, circuit 14 (BN), harness side and ground.
  
  Fig 3: Checking Circuit 14 (BN) For Open (Signal Mirror Marker)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : TURN the headlamp switch OFF. GO to P7.
- No : REPAIR the circuit. TEST the system for normal operation.
P7 CHECK THE MIRROR ASSEMBLY
- Connect: Inoperative Mirror.
- Remove the mirror case front.
- Place the headlamp switch in the parking lamps ON position.
- Measure the voltage between mirror lamp module connector pin 1, harness side and ground.
  
  Fig 4: Checking Mirror Assembly
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : INSTALL a new mirror case front. REFER to REAR VIEW MIRRORS . TEST the system for normal operation.
- No : INSTALL a new outside rear view mirror. REFER to REAR VIEW MIRRORS . TEST the system for normal operation.