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Pinpoint Test N: The Trailer Lamps Are Inoperative

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. N1 DETERMINE IF ALL TRAILER LAMPS ARE INOPERATIVE 
    • Key in OFF position.
    • Place the headlamp switch to the parking lamps ON position.
    • While observing the trailer lamps, apply the brake pedal.
    • Are all the trailer lamps inoperative? 
    • Yes  : TURN the headlamp switch off. GO to  N9.

      No  : If an individual trailer reversing or parking lamp is inoperative, SEND the trailer to an authorized camper/trailer repair center.

      If a trailer stoplamp is inoperative, TURN the headlamp switch off. GO to  N4.

      If the trailer parking lamps are inoperative, LEAVE the parking lamps on. GO to  N9.

      If the trailer reversing lamps are inoperative, TURN the headlamp switch Off. GO to  N14.

    • N2 CHECK CIRCUIT 206 (WH) FOR AN OPEN 
      • Disconnect: Trailer Tow C4098 (4-pin).
      • Disconnect: Trailer Tow C4099 (7-pin).
      • Measure the resistance between the trailer tow C4098 pin 1, circuit 206 (WH) (4-pin connector), harness side and ground; or between the trailer tow C4099 pin 5, circuit 206 (WH) (7-pin connector), harness side and ground.
        Fig 1: Measuring Resistance Between Trailer Tow Pin 1 And Ground
        G03890477Courtesy of FORD MOTOR CO.
      • Is the resistance less than 5 ohms? 
      • Yes  : GO to N3.
      • No  : REPAIR the circuit. TEST the system for normal operation.
    • N3 CHECK CIRCUIT 57 (BK) FOR AN OPEN (ALL LAMPS INOPERATIVE) 
      • Disconnect: Trailer Tow Parking Lamp Relay C1199.
      • Measure the resistance between the trailer tow parking lamp relay C1199 pin 2, circuit 57 (BK), harness side and ground.
        Fig 2: Measuring Resistance Between Relay Connector And Ground
        G03890478Courtesy of FORD MOTOR CO.
      • Is the resistance less than 5 ohms? 
      • Yes  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center.
      • No  : REPAIR the circuit. TEST the system for normal operation.
    • N4 CHECK FOR VOLTAGE TO THE TRAILER (STOPLAMPS INOPERATIVE) 
      • Disconnect: Trailer Tow C4098 (4-pin).
      • Disconnect: Trailer Tow C4099 (7-pin).
      • While applying the brake pedal, measure the voltage between the trailer tow connector and ground as follows:
        PIN SPECIFICATION

        Trailer Tow Connector Pin Circuit
        C4098 (4-pin) 3 (LH stoplamp) 52 (YE)
        C4098 (4-pin) 4 (RH stoplamp) 64 (DG)
        C4099 (7-pin) 6 (LH stoplamp) 52 (YE)
        C4099 (7-pin) 3 (RH stoplamp) 64 (DG)
        Fig 3: Measuring Voltage Between Trailer Tow Connector And Ground
        G03890479Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center.
      • No  : GO to N5.
    • N5 CHECK THE TRAILER TOW TURN RELAY 
      • Disconnect: Suspect Trailer Tow Relay.
      • Carry out the trailer tow relay component test. Refer to COMPONENT TESTING for component testing.
      • Is the trailer tow relay OK? 
      • Yes  : GO to N6.
      • No  : INSTALL a new trailer tow relay. TEST the system for normal operation.
    • N6 CHECK CIRCUIT 212 (DB) FOR AN OPEN 
      • If early production, measure the voltage between the trailer tow LH turn relay C120 pin 3, circuit 212 (DB), harness side and ground; or between trailer tow RH turn relay C119 pin 3, circuit 212 (DB), harness side and ground.
        Fig 4: Checking Relay Power Supply
        G03890480Courtesy of FORD MOTOR CO.
      • If late production, measure the voltage between the trailer tow LH turn relay C119 pin 30, circuit 212 (DB), harness side and ground; or between trailer tow RH turn relay C120 pin 30, circuit 212 (DB), harness side and ground.
        Fig 5: Measuring Voltage Between Relay Socket And Ground
        G03878355Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : GO to N7.
      • No  : REPAIR the circuit. TEST the system for normal operation.
    • N7 CHECK CIRCUIT 57 (BK) FOR AN OPEN (TRAILER STOPLAMPS INOPERATIVE) 
      • If early production, measure the resistance between the trailer tow LH turn relay C120 pin 2, circuit 57 (BK), harness side and ground; or between trailer tow RH turn relay C119 pin 2, circuit 57 (BK), harness side and ground.
        Fig 6: Measuring Resistance Between Trailer Tow LH Turn Relay Pin 2 And Ground
        G03890482Courtesy of FORD MOTOR CO.
      • If late production, measure the resistance between the trailer tow LH turn relay C119 pin 86, circuit 57 (BK), harness side and ground; or between trailer tow RH turn relay C120 pin 86, circuit 57 (BK), harness side and ground.
        Fig 7: Measuring Resistance Between Relay Connector And Ground
        G03910971Courtesy of FORD MOTOR CO.
      • Is the resistance less than 5 ohms? 
      • Yes  : GO to N8.
      • No  : REPAIR the circuit. TEST the system for normal operation.
    • N8 CHECK CIRCUIT 5 (OG/LB) (RH) OR CIRCUIT 9 (LG/OG) (LH) FOR AN OPEN 
      • If early production, while applying the brake pedal, measure the voltage between the trailer tow LH turn relay C120 pin 1, circuit 9 (LG/OG), harness side and ground; or between trailer tow RH turn relay C119 pin 1, circuit 5 (OG/LB), harness side and ground
        Fig 8: Measuring Voltage Between Trailer Tow LH Turn Relay Pin 1 And Ground
        G03890484Courtesy of FORD MOTOR CO.
      • If late production, while applying the brake pedal, measure the voltage between the trailer tow LH turn relay C119 pin 85, circuit 9 (LG/OG), harness side and ground; or between trailer tow RH turn relay C120 pin 85, circuit 5 (OG/LB), harness side and ground
        Fig 9: Measuring Voltage Between Relay And Ground
        G03890485Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : REPAIR circuit 64 (DG) (RH) or circuit 52 (YE) (LH). TEST the system for normal operation.
      • No  : REPAIR circuit 5 (OG/LB) (RH) or circuit 9 (LG/OG) (LH). TEST the system for normal operation.
    • N9 CHECK FOR VOLTAGE TO THE TRAILER (PARKING LAMPS INOPERATIVE) 
      • Disconnect: Trailer Tow C4098 (4-pin).
      • Disconnect: Trailer Tow C4099 (7-pin).
      • Measure the voltage between the trailer tow C4098 pin 2, circuit 962 (BN/WH) (4-pin connector), harness side connector and ground; or between the trailer tow C4099 pin 7, circuit 962 (BN/WH) (7-pin connector), harness side connector and ground.
        Fig 10: Measuring Voltage Between Trailer Tow Pin 2 And Ground
        G03890486Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center.
      • No  : TURN the headlamp switch off. GO to N10.
    • N10 CHECK THE TRAILER TOW PARKING LAMP RELAY 
      • Disconnect: Trailer Tow Parking Lamp Relay C1199.
      • Carry out the trailer tow parking lamp relay component test. Refer to COMPONENT TESTING for component testing.
      • Is the trailer tow parking lamp relay OK? 
      • Yes  : GO to N11.
      • No  : INSTALL a new trailer tow parking lamp relay. TEST the system for normal operation.
    • N11 CHECK CIRCUIT 1043 (DG/YE) FOR AN OPEN 
      • Measure the voltage between the trailer tow parking lamp relay C1199 pin 3, circuit 1043 (DG/YE), harness side and ground.
        Fig 11: Checking Relay Power Supply
        G03890480Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : GO to N12.
      • No  : REPAIR the circuit. TEST the system for normal operation.
    • N12 CHECK CIRCUIT 57 (BK) FOR AN OPEN (TRAILER PARKING LAMPS INOPERATIVE) 
      • Measure the resistance between the trailer tow parking lamp relay C1199 pin 2, circuit 57 (BK), harness side and ground.
        Fig 12: Measuring Resistance Between Relay Connector And Ground
        G03890478Courtesy of FORD MOTOR CO.
      • Is the resistance less than 5 ohms? 
      • Yes  : GO to N13.
      • No  : REPAIR the circuit. TEST the system for normal operation.
    • N13 CHECK CIRCUIT 14 (BN) FOR AN OPEN 
      • Place the headlamp switch to the parking lamps ON position.
      • Measure the voltage between the trailer tow parking lamp relay C1199 pin 1, circuit 14 (BN), harness side and ground.
        Fig 13: Measuring Voltage Between Relay Connector And Ground
        G03890493Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : REPAIR circuit 962 (BN/WH). TEST the system for normal operation.
      • No  : REPAIR circuit 14 (BN). TEST the system for normal operation.
    • N14 CHECK FOR VOLTAGE TO THE TRAILER (REVERSING LAMPS INOPERATIVE) 
      • Disconnect: Trailer Tow C4099 (7-pin).
      • Apply the parking brake.
      • Key in ON position.
      • Place the transmission in REVERSE.
      • Measure the voltage between the trailer tow C4098 pin 1, circuit 963 (BK/LG) (7-pin connector), harness side connector and ground.
        Fig 14: Measuring Voltage Between Trailer Tow Pin 1 And Ground
        G03890490Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center.
      • No  : GO to N15.
    • N15 CHECK THE TRAILER TOW REVERSING LAMP RELAY 
      • Place the transmission in PARK.
      • Key in OFF position.
      • Disconnect: Trailer Tow Reversing Lamp Relay C1178.
      • Carry out the trailer tow reversing lamp relay component test. Refer to COMPONENT TESTING for component testing.
      • Is the trailer tow reversing lamp relay OK? 
      • Yes  : GO to N16.
      • No  : INSTALL a new trailer tow reversing lamp relay. TEST the system for normal operation.
    • N16 CHECK CIRCUIT 1043 (DG/YE) FOR AN OPEN 
      • Measure the voltage between the trailer tow reversing lamp relay C1178 pin 3, circuit 1043 (DG/YE), harness side and ground.
        Fig 15: Checking Relay Power Supply
        G03890480Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : GO to N17.
      • No  : REPAIR the circuit. TEST the system for normal operation.
    • N17 CHECK CIRCUIT 57 (BK) FOR AN OPEN (TRAILER REVERSING LAMPS INOPERATIVE) 
      • Measure the resistance between the trailer tow reversing lamp relay C1178 pin 2, circuit 57 (BK), harness side and ground.
        Fig 16: Measuring Resistance Between Relay Connector And Ground
        G03890478Courtesy of FORD MOTOR CO.
      • Is the resistance less than 5 ohms? 
      • Yes  : GO to N18.
      • No  : REPAIR the circuit. TEST the system for normal operation.
    • N18 CHECK CIRCUIT 140 (BK/PK) FOR AN OPEN 
      • Key in ON position.
      • Place the transmission in REVERSE.
      • Measure the voltage between the trailer tow reversing lamp relay C1178 pin 1, circuit 140 (BK/PK), harness side and ground.
        Fig 17: Measuring Voltage Between Relay Connector And Ground
        G03890493Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 10 volts? 
      • Yes  : REPAIR circuit 963 (BK/LG). TEST the system for normal operation.
      • No  : REPAIR circuit 140 (BK/PK). TEST the system for normal operation.
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