1997 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Additional Sub Key Programming

NOTE: This is done for an additional sub 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 4 times, ending with ignition ON.
  2. Perform this step within 20 seconds of completing last step. Open and close driver's door 5 times. Remove master key from ignition.
  3. Perform this step within 10 seconds of completing last step. Insert sub 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 sub key, remove registered sub key and insert new sub 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

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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.

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