1997 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Additional Master Key Programming

NOTE: This is done for an additional master key.
  1. Perform this step within 15 seconds. Ensure all doors are closed and key is not in ignition. Insert master key in ignition, then turn ignition from LOCK to ON 5 times, ending with ignition ON.
  2. Perform this step within 20 seconds of completing last step. Open and close driver's door 6 times. Remove master key from ignition.
  3. Perform this step within 10 seconds of completing last step. Insert new master key in ignition.
  4. Perform this step within 10 seconds of completing last step. Turn ignition on for 60 seconds or more. Remove key from ignition.
  5. If registering another master key, remove registered master key and insert new master key within 10 seconds. Turn ignition on for 60 seconds or more. Remove key from ignition.
  6. To end programming, open and close driver's door.
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.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

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

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • 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.