1990 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Remote Keyless Entry: Operation

The operational range of the RKE transmitter is about 3 feet from the outside handle of the driver's door. To use the RKE system, push the main switch on the instrument panel to the ON position. The remote control switch built into the master key can be pushed to lock or release all doors from outside the vehicle.

The operator has 30 seconds to open a door after using the remote unlock feature. If a door is not opened by then, all doors will automatically lock.

When any door is released, pushing the remote control switch locks all the doors. To release them, push the switch again.

Continued pushing of the remote control switch will not cause repeated locking and unlocking of the doors. To reverse the operation performed by the remote control switch, the switch must first be released, then pressed again.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.