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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1088 (Exterior Lighting System) >> Diagnostic Tests >> Stoplamps >> Pinpoint Tests >> Pinpoint Test J: The Stoplamps Are Inoperative >> Pinpoint Test J: The STOPLAMPS Are Inoperative

Pinpoint Test J: The STOPLAMPS Are Inoperative

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. J1 CHECK CIRCUIT 10 (LG/RD) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Stoplamp Switch C278
      • Fig 1: Checking Circuit For Voltage
      GF0025969Courtesy of FORD MOTOR CO.
    • Measure the voltage between the stoplamp switch C278-2, circuit 10 (LG/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J2.
    2. NO  : VERIFY the SJB fuse 6 (15A) is OK. If OK, go to  J3 .
  2. J2 CHECK THE STOPLAMP SWITCH 
      Fig 2: Connecting Fused Jumper Wire
      GF0025970Courtesy of FORD MOTOR CO.
    • Connect a fused (15A) jumper wire between the stoplamp switch C278-2, circuit 10 (LG/RD), harness side and the stoplamp switch C278-1, circuit 511 (LG), harness side.
    • Are the stoplamps illuminated? 
    1. YES  : INSTALL a new stoplamp switch. REFER to Stoplamp Switch . TEST the system for normal operation.
    2. NO  : REPAIR circuit 511 (LG). CLEAR the DTCs. REPEAT the self-test.
  3. J3 CHECK CIRCUIT 10 (LG/RD) FOR AN OPEN 
    • Disconnect: SJB C2280c
      • Fig 3: Checking Circuit For Open
      GF0025971Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280c-17, circuit 10 (LG/RD), harness side and the stoplamp switch C278-2, circuit 10 (LG/RD), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  J4.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. J4 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? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. 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.
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