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Home >> Tesla >> 2021 >> Model S Long Range Plus >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (Rear Drive Unit -- Model S) >> Rear Inverter >> Large Drive Unit Inverter Isolation Check >> Procedure
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Large Drive Unit Inverter Isolation Check: Procedure

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2020 Tesla Model S, 2019 Tesla Model S, 2018 Tesla Model S, 2017 Tesla Model S, and 2016 Tesla Model S. However, it is still accessible from the selected car via links, so may be relevant.
  1. Move the vehicle to a two-post lift. See Raise Vehicle - 2 Post Lift .
  2. Remove the rear underhood apron. See Underhood Apron - Rear (Remove and Replace) .
  3. Remove the RH underhood apron. See Underhood Apron - LH (Remove and Replace) .
  4. Disconnect 12V power. See Disconnect 12V Power .
  5. Remove the mid aero shield panel. See Panel - Aero Shield - Mid (Remove And Replace) .
  6. Disconnect the electrical harness from the rear drive unit inverter low voltage connector.
    G00656974Courtesy of TESLA, INC.
  7. Completely loosen the bolt, and then remove the rear drive unit inverter HV cover from the rear drive unit inverter.
    G00656975Courtesy of TESLA, INC.
  8. Remove and discard the O-rings (x2) from the rear drive unit inverter HV cover.
    G00656976Courtesy of TESLA, INC.
  9. Perform an isolation/insulation test of the rear drive unit inverter HV terminals. See Isolation/Insulation Test.
    CAUTION: For this test:
    • Set the test voltage to 500V
    • Measure resistance at the B+ and B- terminals of the rear drive unit inverter and record value
    • Measure voltage at the B+ and ground, B- and ground, and B+ and B-
    • Do not remove the probes from the terminals until the voltage has dropped to 10V or less.
    G00656977Courtesy of TESLA, INC.
    G00656978Courtesy of TESLA, INC.
    G00656979Courtesy of TESLA, INC.
  10. Lubricate the new rear drive unit inverter HV cover O-rings with silicone lubricant, and then install the O-rings onto the rear drive unit inverter HV cover.
    G00656976Courtesy of TESLA, INC.
  11. Postion the rear drive unit inverter HV cover over the rear drive unit inverter low voltage connector, press the cover in, and then tighten the bolt that attaches the cover to the rear drive unit inverter.

    3 Nm (2.2 lbs-ft) 

    G00656975Courtesy of TESLA, INC.
  12. Connect the electrical harness to the rear drive unit inverter low voltage connector.
    G00656974Courtesy of TESLA, INC.
  13. Install the mid aero shield panel. See Panel - Aero Shield - Mid (Remove And Replace) .
  14. Connect 12V power. See Disconnect 12V Power .
  15. Install the RH underhood apron. See Underhood Apron - LH (Remove and Replace) .
  16. Install the rear underhood apron. See Underhood Apron - Rear (Remove and Replace) .
  17. Remove the vehicle from the two-post lift. See Raise Vehicle - 2 Post Lift .
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