Tesla Model 3 Owners & Service Manuals

Tesla Model 3: Shunt - HV Battery (Remove and Replace)

Tesla Model 3 2017-2025 Service Manual / Battery System / HV Battery Electrical Components / Shunt - HV Battery (Remove and Replace)

Shunt - HV Battery (Remove and Replace)

SPECIAL TOOLS

Ratchet, 1/4" Sq Dr, HV Insulated (1057602-00-A)

Ext Bar, Wobble, 1/4" Dr, HV Insulated (1057603-00-A)

Skt, 1/4" Sq Dr, 13mm, HV Insulated (1057606-00-A)

Resistance meter, microohm, Hioki RM 3548 (1076927-00-A)

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 0 (1000V) must be worn at all times a high voltage cable, busbar, or fitting is handled. Refer to Tech Note TN-15-92-003, "High Voltage Awareness Care Points" for additional safety information.

Remove

  1. Remove the pyrotechnic battery disconnect. See Pyrotechnic Battery Disconnect (Remove and Replace).
  2. Disconnect the electrical harness from the shunt connector

Shunt - HV Battery (Remove and Replace)

  1. Remove and discard the bolt that attaches the shunt to the busbar.
  2. Remove the shunt from the vehicle.

Install

  1. Use an IPA wipe to clean the HV mating surfaces of the shunt, busbar, and the pryotechnic battery disconnect.

Shunt - HV Battery (Remove and Replace)

  1. Install the shunt to the busbar, install a new bolt to attach the shunt to the busbar, and then mark the bolt with a paint pen after it is torqued. Torque 9 Nm

Generic Measurement - Actual busbars and fasteners might appear different Generic Measurement - Actual busbars and fasteners might appear different

  1. Use the Hioki resistance meter to measure the resistance between the shunt and the adjacent busbar.

Note: The maximum acceptable resistance is 0.045 mΩ (45 μΩ). If the resistance is above this value, escalate a Toolbox session, as appropriate.

  1. Connect the electrical harness to the shunt connector
  2. Install the pyrotechnic battery disconnect. See Pyrotechnic Battery Disconnect (Remove and Replace).

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