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Pinpoint Test

NOTE: Before beginning diagnostics, visually inspect the trailer tow connector mounted on the bumper 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. Apply the parking brake.
    2. Ignition ON.
    3. Select REVERSE.
    4. Measure:
      Trailer Tow Connector Ground
      G08036720
      G08036817
      Trailer Tow Connector Ground
      Pin Circuit Measurement / Action Pin Circuit
      7 CAT16 (GY/BN)
      G08036818
      		 - 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: VERIFY the BJB fuse 60 (10A) is OK. If OK, GO to 2  . If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the cause for the circuit short.
  2. CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (VEHICLE HARNESS)
    1. Ignition OFF.
    2. Disconnect: Trailer Tow Connector.
    3. Ignition ON.
    4. Select REVERSE.
    5. Measure:
      Trailer Tow Ground
      G08036819
      G08036820
      C4099 Ground
      Pin Circuit Measurement / Action Pin Circuit
      7 CAT16 (GY/BN)
      G08036821
      		 - 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 REVERSING LAMP RELAY
    1. Ignition OFF.
    2. Disconnect: Trailer Tow Parking Lamp Relay.
    3. Substitute a known good relay.
    4. Ignition ON.
    5. Select REVERSE.
    6. Measure:
      Trailer Tow Ground
      G08036822
      G08036823
      C4099 Ground
      Pin Circuit Measurement / Action Pin Circuit
      7 CAT16 (GY/BN)
      G08036824
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: REMOVE the known good relay. INSTALL a new trailer tow reversing lamp relay.
    • No: REMOVE the known good relay. GO to 4  .
  4. CHECK THE TRAILER TOW REVERSING LAMP RELAY COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
    1. Select REVERSE.
    2. Measure:
      BJB Ground
      G08036825
      G08036826
      Trailer Tow Reversing Lamp Relay Ground
      Pin Circuit Measurement / Action Pin Circuit
      1 CLS28 (BU/WH)
      G08036827
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 5  .
    • No: REPAIR the circuit.
  5. CHECK THE TRAILER TOW REVERSING LAMP RELAY BJB VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
    1. Select PARK.
    2. Ignition OFF.
    3. Measure:
      BJB Ground
      G08036825
      G08036829
      Trailer Tow Reversing Lamp Relay Ground
      Pin Circuit Measurement / Action Pin Circuit
      3 SBB60 (GN/RD)
      G08036830
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 6  .
    • No: REPAIR the circuit.
  6. CHECK THE TRAILER TOW REVERSING LAMP RELAY GROUND CIRCUIT FOR AN OPEN
    1. Measure:
      BJB BJB
      G08036825
      G08036825
      Trailer Tow Reversing Lamp Relay Trailer Tow Reversing Lamp Relay
      Pin Circuit Measurement / Action Pin Circuit
      3 SBB60 (GN/RD)
      G08036833
      		 2 GD120 (BK/GN)

    Is the voltage greater than 11 volts? 

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