Tesla Model S: HV Junction Box - Cover - 1st Generation (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.

Removal

1. Disconnect 12V and HV power:
   • Rear wheel drive (RWD): Refer to procedure.
   • Dual Motor: Refer to procedure.
2. Remove the 2nd row cushion frame (refer to procedure).

Warning: Ensure that the multimeter and leads are capable of handling at least 500V.

3. Remove the bolts (x6) that secure the HV junction box cover (torque 5 Nm). Remove the cover.

   

4. Use a multimeter to check voltages across the HV cables and to ground:
   • B+ to ground
   • B- to ground
   • B+ to B- Warning: If any voltage reading is more than 10V, the high voltage contactors are not fully opened. Due to the risk of electrocution, contact Service Engineering before performing any further work.

     

     1	B+
     2	Ground
     3	B-

Installation procedure is the reverse of removal.

READ NEXT: