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Home >> Tesla >> 2021 >> Model X Performance >> Repair and Diagnosis >> Electrical >> Charging Systems >> Electrical System (1 Of 3) -- Model X >> LV Battery And Fuses >> Vehicle Electrical Isolation Procedure >> Isolate
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Vehicle Electrical Isolation Procedure: Isolate

  1. Move the vehicle to a 2 post lift.
  2. Disconnect LV power. See LV POWER (DISCONNECT AND CONNECT) .
  3. Set the high voltage multimeter to DC voltage, lightly touch the probes to the auxiliary battery connector contacts, and verify that the multimeter displays a voltage.
    NOTE: Battery voltage is typically 14.5 to 15.5 volts. If the battery voltage is 0 volts, the battery may have switched off internally. Use a 12V lead acid battery for testing. Lead acid battery voltage is typically 10 to 14 volts.
    G15431883Courtesy of TESLA, INC.
    G15431884Courtesy of TESLA, INC.
  4. Raise the vehicle. See Raise Vehicle - 2 Post Lift .
  5. Remove the mid aero shield panel. See Panel - Aero Shield - Mid (Remove and Replace) .
  6. Install the current clamp meter on the LH rear drive unit HV harness.
    NOTE: Install the meter on one cable.
    NOTE: Make sure the meter is facing the correct direction.
    NOTE: Long Range
    G15431885Courtesy of TESLA, INC.
    NOTE: Plaid
    G15431886Courtesy of TESLA, INC.
  7. Make sure the meter is zeroed out, and then take a measurement.
    • If the measurement is less than 0.5 A, continue to the next step.
    • If the measurement is greater than 0.5 A, re-perform the LV power disconnect, step  6, and step  7. If the measurement is still greater than 0.5 A, escalate for assistance.
  8. Remove all items from pockets and make sure not to wear any metal items.
  9. Inspect the HV insulating gloves.
    NOTE: Refer to service document TN-15-92-003, for information on inspecting HV gloves.
  10. Put on the HV insulating gloves and then leather over gloves.
    G15431887Courtesy of TESLA, INC.
  11. Slide the red connector locking tab, open the black release lever, and then disconnect the rear drive unit HV harness from the HV battery LH HV header.
    G15431888Courtesy of TESLA, INC.
  12. Use the high voltage multimeter to verify that no high voltage is present at the HV battery rear drive unit header.
    NOTE: Measure B+ to B-, B+ to Ground, and B- to Ground. If any voltage is greater than 10V, the contactors are closed or welded. Escalate to Service Engineering.
    G15431889Courtesy of TESLA, INC.
    G15431890Courtesy of TESLA, INC.
    G15431891Courtesy of TESLA, INC.
  13. Return to the procedure that required vehicle electrical isolation.
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