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Pinpoint Test

NOTE: Before beginning diagnostics, visually inspect the trailer tow connector for signs of corrosion or damage. Repair or install a new trailer tow connector as required.
  1. CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR
    1. Ignition OFF.
    2. Place the headlamp switch in the parking lamps on position.
    3. For the 4-pin connector, measure:
      Trailer Tow Ground
      G08036792
      G08036793
      C439 Ground
      Pin Circuit Measurement / Action Pin Circuit
      3 CAT17 (BN)
      G08036794
      		 - Ground
    4. For the 7-pin connector, measure:
      Trailer Tow Connector Ground
      G08036720
      G08036796
      Trailer Tow Connector Ground
      Pin Circuit Measurement / Action Pin Circuit
      6 CAT17 (BN)
      G08036797
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
    • No: For the 4-pin connector, GO to  3.

      For the 7-pin connector, GO to 2  .

  2. CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (7-PIN)
    1. Disconnect: Trailer Tow Connector.
    2. Measure:
      Trailer Tow Ground
      G08036798
      G08036799
      C4099 Ground
      Pin Circuit Measurement / Action Pin Circuit
      6 CAT17 (BN)
      G08036800
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: INSTALL a new trailer tow connector. TEST the system for normal operation.
    • No: GO to 3  .
  3. CHECK THE TRAILER TOW PARKING LAMP RELAY
    1. Place the headlamp switch in the off position.
    2. Disconnect: Trailer Tow Parking Lamp Relay.
    3. Substitute a known good relay.
    4. Place the headlamp switch in the parking lamps on position.
    5. For the 4-pin connector, measure:
      Trailer Tow Ground
      G08036802
      G08036801
      C439 Ground
      Pin Circuit Measurement / Action Pin Circuit
      3 CAT17 (BN)
      G08036803
      		 - Ground
    6. For the 7-pin connector, measure:
      Trailer Tow Ground
      G08036804
      G08036805
      C4099 Ground
      Pin Circuit Measurement / Action Pin Circuit
      6 CAT17 (BN)
      G08036806
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: REMOVE the known good relay. INSTALL a new trailer tow parking lamp relay.
    • No: REMOVE the known good relay. GO to 4  .
  4. CHECK THE TRAILER TOW PARKING LAMP RELAY COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
    1. Measure:
      BJB Ground
      G08036714
      G08036808
      Trailer Tow Parking Lamp Relay Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 circuit CBP40 (YE/GN)
      G08036809
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 5  .
    • No: REPAIR the circuit.
  5. CHECK THE TRAILER TOW PARKING LAMP RELAY BJB VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
    1. Place the headlamp switch in the off position.
    2. Measure:
      BJB Ground
      G08036714
      G08036811
      Trailer Tow Parking Lamp Relay Ground
      Pin Circuit Measurement / Action Pin Circuit
      3 SBB84 (GN/RD)
      G08036812
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 6  .
    • No: VERIFY the BJB fuse 84 (20A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the cause for the circuit short.
  6. CHECK THE TRAILER TOW PARKING LAMP RELAY GROUND CIRCUIT FOR AN OPEN
    1. Measure:
      BJB BJB
      G08036714
      G08036714
      Trailer Tow Parking Lamp Relay Trailer Tow Parking Lamp Relay
      Pin Circuit Measurement / Action Pin Circuit
      3 SBB84 (GN/RD)
      G08036815
      		 1 GD120 (BK/GN)

    Is the voltage greater than 11 volts? 

    • Yes: REPAIR the trailer tow parking lamp relay output circuit to the trailer tow connector for an open.
    • No: REPAIR the trailer tow parking lamp relay ground circuit for an open.
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