How to Disable Electrical System

2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION How to Disable Electrical System


- Immobilize Vehicle
Chock wheels and set the parking brake.
Move the shift lever to the P (Park) position.

- Disable Vehicle
Performing either of the following two procedures will shut the vehicle off and disable the HV battery pack, SRS, and gasoline fuel pump.

Procedure #1
Turn the ignition key off.
1. Remove the key and place on dash.
2. If the key cannot be removed, disconnect the 12-Volt auxiliary battery in the engine compartment.

Procedure #2 (Alternate if ignition key is inaccessible).
1. Disconnect the 12-Volt auxiliary battery in the engine compartment.
2. Remove engine compartment covers.
3. Remove the fuse box cover.
4. Remove the IGCT No. 4 fuse (10A Red colored) in the engine compartment junction block. When in doubt, pull all four fuses in the fuse block.

WARNING: High voltage electricity can cause death or serious injury from severe burns or electric shock. To avoid death or serious injury wait 5 minutes after disabling the vehicle to discharge high voltage electricity, and do not touch, cut, or open any orange high voltage power cable or high voltage component.

The SRS airbags can cause death or serious injury by sudden deployment. To avoid death or serious injury wait 90 seconds after disabling the vehicle to allow the SRS backup power to discharge.

If neither of the disabling procedures can be performed, proceed with caution as there is no assurance that the high voltage electrical system, SRS, or fuel pump are disabled.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.