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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2439 (Exterior Lighting System) >> Diagnosis And Testing >> Stoplamps >> Pinpoint Tests >> Pinpoint Test I: All The Stoplamps Are Inoperative >> Pinpoint Test I: All The STOPLAMPS Are Inoperative

Pinpoint Test I: All The STOPLAMPS Are Inoperative

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. I1 CHECK FOR VOLTAGE TO THE STOPLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Stoplamp Switch C278.
    • Measure the voltage between the stoplamp switch C278-1, circuit SBP02 (YE/RD), harness side and ground.
      Fig 1: Measuring Voltage Between Stoplamp Switch C278-1, Circuit SBP02 (YE/RD), Harness Side And Ground
      G06099159Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to I2  .
    • No:  VERIFY the SJB  fuse 2 (15A) is OK. If OK, GO to  I3. If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short.
  2. I2 BYPASS THE STOPLAMP SWITCH 
    • Connect a fused jumper wire between the stoplamp switch C278-1, circuit SBP02 (YE/RD), harness side and the stoplamp switch C278-4, circuit CCB08 (VT/WH), harness side.
      Fig 2: Connecting Fused Jumper Wire Between Stoplamp Switch C278-1, Circuit SBP02 (YE/RD) And C278-4, Circuit CCB08 (VT/WH)
      G06099160Courtesy of FORD MOTOR CO.
    • Are the stoplamps illuminated? 
    • Yes:  REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to STOPLAMP SWITCH . TEST the system for normal operation.
    • No:  REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.
  3. I3 CHECK THE STOPLAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Disconnect: SJB  C2280d.
    • Measure the resistance between the stoplamp switch C278-1, circuit SBP02 (YE/RD), harness side and the SJB  C2280d-13, circuit SBP02 (YE/RD), harness side.
      Fig 3: Checking Stoplamp Voltage Supply Circuit For An Open
      G06099161Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to I4  .
    • No:  REPAIR SBP02 (YE/RD) for an open. TEST the system for normal operation.
  4. I4 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • 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 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.
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