Pinpoint Test I: The STOPLAMPS Are Inoperative

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

I1 CHECK CIRCUIT SBP04 (GN/RD) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Stoplamp Switch C278.
- Measure the voltage between the stoplamp switch C278-1, circuit SBP04 (GN/RD), harness side and ground.
  
  Fig 1: Checking Circuit SBP04 (GN/RD) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to I3.

No : VERIFY the SJB fuse 21 (7.5A) is OK. If OK, GO to I2.
I2 CHECK CIRCUIT SBP04 (GN/RD) FOR AN OPEN
- Disconnect: SJB C2280a.
- Measure the resistance between the stoplamp switch C278-1, circuit SBP04 (GN/RD), harness side and the SJB C2280a-8, circuit SBP04 (GN/RD), harness side.
  
  Fig 2: Checking Circuit SBP04 (GN/RD) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to I6.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
I3 CHECK THE STOPLAMP SWITCH
- Connect a fused (5A) jumper wire between the stoplamp switch C278-1, circuit SBP04 (GN/RD), harness side and the stoplamp switch C278-4, circuit CCB08 (VT/WH), harness side.
  
  Fig 3: Checking Stoplamp Switch
  Courtesy of FORD MOTOR CO.
- Are the stoplamps illuminated?
Yes : INSTALL a new stoplamp switch. REFER to STOPLAMP SWITCH . CLEAR the DTCs. REPEAT the self-test.

No : REMOVE the jumper wire. GO to I4.
I4 CHECK CIRCUIT CCB08 (VT/WH) FOR AN OPEN
- Disconnect: SJB C2280a.
- Measure the resistance between the stoplamp switch C278-4, circuit CCB08 (VT/WH), harness side and the SJB C2280a-19, circuit CCB08 (VT/WH), harness side.
  
  Fig 4: Checking Circuit CCB08 (VT/WH) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : For Fusion, GO to I6.

For Milan or Zephyr, GO to I5.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
I5 CHECK CIRCUIT CLS17 (YE/GY) FOR AN OPEN
- Disconnect: SJB C2280e.
- Disconnect: High Mounted Stoplamp C475.
- Measure the resistance between the high mounted stoplamp C475-1, circuit CLS17 (YE/GY), harness side and the SJB C2280e-26, circuit CLS17 (YE/GY), harness side.
  
  Fig 5: Checking Circuit CLS17 (YE/GY) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to I6.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
I6 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - Corrosion
  - Pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.