1997 Lexus ES 300FACTORY OEM SERVICE PROCEDURE

Vehicle Access Code Programming

There are 4 modes of vehicle access code programming.

  • Add Mode - Add a transmitter without erasing existing code. ECU has a capacity of 4 transmitter codes.
  • Rewrite Mode - Erases all previous transmitter codes and reprograms new transmitters or ECU.
  • Confirmation Mode - Informs user of number of existing codes in ECU.
  • Erase Mode - Erases all existing codes and cancels operation. Use if transmitter is stolen.
  1. To begin reprogramming, ensure key is not inserted in ignition switch. Ensure driver's door is open and unlocked, and all other doors are closed. Insert key in ignition switch, then remove it.
  2. Press door lock switch to LOCK, then within one second, press door lock switch to UNLOCK position. Repeat procedure continuously until door locks have been locked and unlocked 5 times. This procedure must be carried out within 40 seconds.
  3. Close driver's door. Repeat procedure in step 2). Insert key in ignition switch. To enter desired mode, turn ignition switch to ON position and back to LOCK (one cycle), within one second, the specified number of times. See MODE SELECTIONΒ  table. Remove key from ignition switch.
    MODE SELECTION

    Mode No. Of Ignition Switch Cycles
    Add Mode 1
    Rewrite Mode 2
    Confirmation Mode 3
    Erase Mode 5
  4. If any mode other than confirmation mode is selected, go to next step. If confirmation mode was selected, door locks will cycle to lock position 0-4 times depending on how many transmitter codes are stored in ECU. (e.g., 2 stored codes = 2 door lock cycles).
  5. If add mode, rewrite mode or erase mode is selected, to confirm proper initiation, door locks will automatically cycle one time for add mode, 2 times for rewrite mode and 5 times for erase mode.
  6. Press new transmitter button for at least one second. Door locks should cycle once to confirm transmitter signal was received by ECU. Perform next step within 20 seconds.
  7. Close driver's door, then open it. Press transmitter button again for at least one second. If door locks cycle once, new transmitter code has been successfully accepted. If door locks cycle 2 times, new transmitter code was not successfully accepted.
  8. To program another transmitter or make a second attempt at programming in a transmitter code, repeat steps 6) and 7).
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:

  • 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.

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