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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1928 (Exterior Lighting System (F250-F550)) >> Diagnostic Tests >> Trailer Lamps >> Pinpoint Tests >> Pinpoint Test Y: The Individual Trailer Lamp Is Inoperative - LH Trailer Turn Signal/Stoplamp/Hazard Lamp >> Pinpoint Test Y: The Individual Trailer Lamp Is Inoperative - LH Trailer Turn Signal/STOPLAMP/Hazard Lamp

Pinpoint Test Y: The Individual Trailer Lamp Is Inoperative - LH Trailer Turn Signal/STOPLAMP/Hazard Lamp

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. Y1 CHECK CIRCUIT 52 (YE) FOR VOLTAGE 
    • Disconnect: Trailer Tow C4098 (4-Pin)
    • Disconnect: Trailer Tow C4099 (7-Pin)
    • Key in OFF position.
      • Fig 1: Checking Circuit For Voltage
      GF0008338Courtesy of FORD MOTOR CO.
    • While applying the brake pedal, measure the voltage between the trailer tow C4098-2, circuit 52 (YE) (4-pin connector), harness side and ground; or between the trailer tow C4099-1, circuit 52 (YE) (7-pin connector), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
    2. NO  : Go to  Y2.
  2. Y2 CHECK THE TRAILER TOW LH TURN RELAY 
    • Disconnect: Trailer Tow LH Turn Relay C1188
    • Carry out the trailer tow LH turn relay component test. Refer to COMPONENT TESTING article.
    • Is the trailer tow LH turn relay OK? 
    1. YES  : Go to  Y3.
    2. NO  : INSTALL a new trailer tow LH turn relay. TEST the system for normal operation.
  3. Y3 CHECK CIRCUIT 9 (LG/OG) FOR AN OPEN 
      Fig 2: Checking Circuit For Open
      GF0008335Courtesy of FORD MOTOR CO.
    • While applying the brake pedal, measure the voltage between the trailer tow LH turn relay C1188-2, circuit 9 (LG/OG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  Y4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. Y4 CHECK CIRCUIT 1362 (DG/OG) FOR AN OPEN 
      Fig 3: Checking Circuit For Open
      GF0008336Courtesy of FORD MOTOR CO.
    • Measure the voltage between the trailer tow LH turn relay C1188-3, circuit 1362 (DG/OG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  Y5.
    2. NO  : VERIFY the BJB fuse 9 (20A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  5. Y5 CHECK THE TRAILER LH TURN RELAY GROUND 
      Fig 4: Checking Circuit For Ground
      GF0008337Courtesy of FORD MOTOR CO.
    • Measure the resistance between the trailer tow LH turn relay C1188-1, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit 52 (YE). TEST the system for normal operation.
    2. NO  : REPAIR circuit 57 (BK). TEST the system for normal operation.
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