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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 (BATTERY CHARGE INOPERATIVE)
    1. Start the engine.
    2. Measure:
      Trailer Tow Connector Ground
      G08036720
      G08036859
      Trailer Tow Connector Ground
      Pin Circuit Measurement / Action Pin Circuit
      5 CAT14 (OG)
      G08036860
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 2  .
    • No: VERIFY the BJB fuse 24 (30A) is OK. If OK, GO to  5. If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the cause for the circuit short.
  2. CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR (BATTERY CHARGE ALWAYS ON)
    1. Ignition OFF.
    2. Measure:
      Trailer Tow Connector Ground
      G08036720
      G08036862
      Trailer Tow Connector Ground
      Pin Circuit Measurement / Action Pin Circuit
      5 CAT14 (OG)
      G08036863
      		 - Ground

    Is any voltage present? 

    • Yes: GO to 3  .
    • No: The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
  3. CHECK THE TRAILER TOW BATTERY CHARGE RELAY OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
    1. Disconnect: Trailer Battery Charge Relay. Refer to FUSE AND RELAY INFORMATION .
    2. Measure:
      Trailer Tow Connector Ground
      G08036720
      G08036865
      Trailer Tow Connector Ground
      Pin Circuit Measurement / Action Pin Circuit
      5 CAT14 (OG)
      G08036866
      		 - Ground

    Is any voltage present? 

    • Yes: REPAIR the circuit.
    • No: GO to 4  .
  4. CHECK FOR VOLTAGE TO THE TRAILER BATTERY CHARGE RELAY COIL (ALWAYS ON)
    1. Measure:
      BJB Ground
      G08036867
      G08036868
      Trailer Tow Battery Charge Relay Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 CBB93 (GY/BN)
      G08036869
      		   Ground

    Is any voltage present? 

  5. CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR (BATTERY CHARGE INOPERATIVE)
    1. Ignition OFF.
    2. Disconnect: Trailer Tow Connector.
    3. Start the engine.
    4. Measure:
      Trailer Tow Ground
      G08036870
      G08036871
      C4099 Ground
      Pin Circuit Measurement / Action Pin Circuit
      5 CAT14 (OG)
      G08036872
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: INSTALL a new trailer tow connector. TEST the system for normal operation.
    • No: GO to 6  .
  6. CHECK THE TRAILER TOW BATTERY CHARGE RELAY
    1. Ignition OFF.
    2. Disconnect: Trailer Tow Battery Charge Relay.
    3. Substitute a known good relay.
    4. Start the engine.
    5. Measure:
      Trailer Tow Ground
      G08036873
      G08036874
      C4099 Ground
      Pin Circuit Measurement / Action Pin Circuit
      5 CAT14 (OG)
      G08036875
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: REMOVE the known good relay. INSTALL a new trailer tow battery charge relay.
    • No: REMOVE the known good relay. GO to 7  .
  7. CHECK THE TRAILER TOW BATTERY CHARGE RELAY VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
    1. Ignition OFF.
    2. Measure:
      BJB Ground
      G08036867
      G08036877
      Trailer Tow Battery Charge Relay Ground
      Pin Circuit Measurement / Action Pin Circuit
      3 SBB24 (VT/RD)
      G08036878
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 8  .
    • No: REPAIR the circuit.
  8. CHECK THE TRAILER TOW BATTERY CHARGE RELAY COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
    1. Ignition ON.
    2. Measure:
      BJB Ground
      G08036867
      G08036880
      Trailer Tow Battery Charge Relay Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 CBB93 (GY/BN)
      G08036881
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 9  .
    • No: VERIFY the BJB fuse 93 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the cause for the circuit shortt.
  9. CHECK THE BATTERY CHARGE RELAY COIL GROUND CIRCUIT FOR AN OPEN
    1. Ignition OFF.
    2. Measure:
      BJB BJB
      G08036867
      G08036867
      Trailer Tow Battery Charge Relay Trailer Tow Battery Charge Relay
      Pin Circuit Measurement / Action Pin Circuit
      3 SBB24 (VT/RD)
      G08036884
      		 1 GD120 (BK/GN)

    Is the voltage greater than 11 volts? 

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