Tesla Model S Owners & Service Manuals

Tesla Model S: Forward Junction Box - 2nd Generation - 20 Amp Fuse (RWD) (Remove and Replace)

Tesla Model S (2012-2024) Service Manual / High Voltage System / Forward Junction Box - 2nd Generation - 20 Amp Fuse (RWD) (Remove and Replace)

Warning: Only technicians who have been trained in High Voltage Awareness are permitted to perform this procedure. Proper personal protective equipment (PPE) and insulating HV gloves with a minimum rating of class 00 (500V) must be worn any time a high voltage cable is handled. Refer to Tech Note TN-15-92-003, "High Voltage Awareness Care Points" for additional safety information.

Note: This procedure only applies to RWD vehicles with the 2nd generation High Voltage configuration. The Forward Junction Box (FJB) is part of the DCDC converter for vehicles with the 1st generation High Voltage Configuration.

Special tools required for this procedure:

Supplier Part Number Description
Tesla 1058194-00-A Fuse Puller, small (red)
Tesla 1051659-00-A Access Service Tool, Frunk
Removal
  1. Perform the vehicle electrical isolation procedure (refer to procedure).
  2. Remove the underhood storage extension unit (refer to procedure).
  3. Position the frunk access service tool.
  4. Disconnect the clips (x4) that secure the coolant hose to the crossbar.

    Forward Junction Box - 2nd Generation - 20 Amp Fuse (RWD) (Remove and Replace)

  5. Remove the crossbar from the vehicle.
  6. Release the bolts (x6) that secure the forward junction box cover (torque 6.5 Nm). Remove the cover.

    Forward Junction Box - 2nd Generation - 20 Amp Fuse (RWD) (Remove and Replace)

Warning: Before continuing, put on high voltage gloves.
  1. Use a small, insulated screwdriver or similar tool to pry open the cover on the RH side of the FJB.

    Warning: Do not use a metallic tool to open the cover.

    Forward Junction Box - 2nd Generation - 20 Amp Fuse (RWD) (Remove and Replace)

  2. Use a multimeter to check voltages between:
    • B+ to ground
    • B- to ground
    • B+ and B-
    Warning: If any voltage reading is more than 10V, the contactors are not fully opened. Discontinue this procedure immediately. Contact a Field Service Engineer before performing any further work.
  3. Remove the screws (x3) that secure the plastic cover (torque 3 Nm).

    Forward Junction Box - 2nd Generation - 20 Amp Fuse (RWD) (Remove and Replace)

  4. Use the fuse puller to remove the fuse.

    Forward Junction Box - 2nd Generation - 20 Amp Fuse (RWD) (Remove and Replace) Forward Junction Box - 2nd Generation - 20 Amp Fuse (RWD) (Remove and Replace)

Installation

Installation procedure is the reverse of removal.

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