Pinpoint Test F: One Or More STOPLAMPS Are Inoperative

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

F1 DETERMINE THE INOPERATIVE STOPLAMP(S)
- Observe the stoplamps while applying the brake pedal.
- Are all the stoplamps inoperative?
- Yes : GO to PINPOINT TEST E .
- No : If the high mounted stoplamp is inoperative, GO to F2.
If both rear lamps are inoperative, GO to F3.

If one rear lamp is inoperative, GO to F4.
F2 CHECK THE HIGH MOUNTED STOPLAMP GROUND CIRCUIT FOR AN OPEN
- Key in OFF position.
- Disconnect: High Mounted Stoplamp C475.
- Measure the resistance between the high mounted stoplamp C475 pin 2, circuit 57 (BK), harness side and ground.
  
  Fig 1: Measuring Resistance Between High Mounted Stoplamp Pin 2 And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REPAIR circuit 511 (LG). TEST the system for normal operation.
- No : REPAIR circuit 57 (BK). TEST the system for normal operation.
F3 CHECK THE MULTIFUNCTION SWITCH (BOTH REAR LAMPS INOPERATIVE)
- Key in OFF position.
- Disconnect: Multifunction Switch C202b.
- Carry out the multifunction switch component test. Refer to COMPONENT TESTING for component testing.
- Is the multifunction switch OK?
- Yes : REPAIR circuit 511 (LG). TEST the system for normal operation.
- No : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
F4 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Key in OFF position.
- Disconnect: Inoperative Rear Lamp.
- Measure the resistance between the inoperative rear lamp connector pin 1, circuit 57 (BK), harness side and ground.
  
  Fig 2: Measuring Resistance Between Inoperative Rear Lamp Connector Pin 1 And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to F5.
- No : REPAIR the circuit. TEST the system for normal operation.
F5 CHECK THE MULTIFUNCTION SWITCH (ONE REAR LAMP INOPERATIVE)
- Disconnect: Multifunction Switch C202b.
- Carry out the multifunction switch component test. Refer to COMPONENT TESTING for component testing.
- Is the multifunction switch OK?
- Yes : If the LH rear lamp is inoperative, REPAIR circuit 9 (LG/OG). TEST the system for normal operation. If the RH rear lamp is inoperative, REPAIR circuit 5 (OG/LB). TEST the system for normal operation.
- No : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.