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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2122 (Exterior Lighting System) >> Diagnostic Tests >> Trailer Lamps >> Pinpoint Tests >> Pinpoint Test Y: The Individual Trailer Lamp Is Inoperative - Trailer Stop/Turn Lamp >> Pinpoint Test Y: The Individual Trailer Lamp Is Inoperative - Trailer Stop/Turn Lamp

Pinpoint Test Y: The Individual Trailer Lamp Is Inoperative - Trailer Stop/Turn Lamp

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The battery ground cable must be disconnected for accurate test results when checking ground circuits for continuity to ground.
  1. Y1 CHECK CIRCUIT CAT06 (YE) OR CIRCUIT CAT09 (GN) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Trailer Tow C439
    • For the LH trailer stop/turn lamp, while applying the brake pedal, measure the voltage between the trailer tow C439-2, circuit CAT06 (YE), harness side and ground.
      • Fig 1: Measuring Voltage Between Trailer Tow C439-2, Circuit CAT06 (YE), Harness Side & Ground
      GF0032303Courtesy of FORD MOTOR CO.
    • For the RH trailer stop/turn lamp, while applying the brake pedal, measure the voltage between the trailer tow C439-1, circuit CAT09 (GN), harness side and ground.
      • Fig 2: Measuring Voltage Between Trailer Tow C439-1, Circuit CAT09 (GN), Harness Side & Ground
      GF0032304Courtesy of FORD MOTOR CO.
    • 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 STOP/TURN RELAY 
    • Disconnect: Suspect Trailer Tow Stop/Turn Relay
    • Carry out the trailer tow stop/turn relay component test. Refer to appropriate COMPONENT TESTING article.
    • Is the trailer tow stop/turn relay OK? 
    1. YES  : Go to  Y3.
    2. NO  : INSTALL a new trailer tow stop/turn relay. TEST the system for normal operation.
  3. Y3 CHECK CIRCUIT CLS18 (GY/BN) OR CIRCUIT CLS19 (VT/OG) FOR AN OPEN 
    • While applying the brake pedal, measure the voltage between the trailer tow LH stop/turn relay pin 2, circuit CLS18 (GY/BN), harness side and ground; or between the trailer tow RH stop/turn relay pin 2, circuit CLS19 (VT/OG), harness side and ground.
      • Fig 3: Measuring Voltage
      GF0042713Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  Y4.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  4. Y4 CHECK CIRCUIT SBB14 (BN/RD) FOR AN OPEN 
    • Measure the voltage between the trailer tow LH stop/turn relay pin 3, circuit SBB14 (BN/RD), harness side and ground; or between the trailer tow RH stop/turn relay pin 3, circuit SBB14 (BN/RD), harness side and ground.
      • Fig 4: Measuring Voltage
      GF0042714Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  Y5.
    2. NO  : VERIFY the BJB fuse 14 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  5. Y5 CHECK CIRCUIT GD120 (BK/GN) FOR AN OPEN 
    • Measure the resistance between the trailer tow LH turn relay pin 1, circuit GD120 (BK/GN), harness side and ground; or between the trailer tow RH turn relay pin 1, circuit GD120 (BK/GN), harness side and ground.
      • Fig 5: Measuring Resistance
      GF0042715Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit CAT06 (YE) (LH trailer stop/turn) or circuit CAT09 (GN) (RH trailer stop/turn) for an open. TEST the system for normal operation.
    2. NO  : REPAIR circuit GD120 (BK/GN) for an open. TEST the system for normal operation.
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