Rx300 Keys

[BluAquarius]

I purchased a used RX300 key recently with "programming instructions." The instructions are either incomplete or inaccurate... they only work partially, which isn't much help. Does anyone know where -other than a dealer- I can go to find instructions on reprogramming this key? Online instructions have been difficult to locate. Peace.

[bradsteimel]

Program it to do what? Why not just take it to a dealer?

[mikey00]

You must have one of the original registered master keys to use this procedure:

simultaneously depress and release brake and accelerator pedal 1 time

insert existing master key into ignition

within 15 seconds depress and release accelerator pedal 5 times

within 20 seconds depress and release the brake pedal 6 times and remove key

within 10 seconds insert new key into ignition

within 10 seconds depress and release the accelerator pedal 1 time

after 80 seconds new key is registered and security light goes off

remove new key and depress and release brake pedal 1 time

If you do not have an original registered master key, the ECM (Engine Control Module) must be replaced or flashed to add additional keys.

[pushatam]

The programming procedure for the Transponder Chip for years 98-01 are as follows:

Add Duplicate Key: On-Board Program E (1998+ Toyota, Lexus)

(IGNITION)

1. Simultaneously depress and release brake and accelerator pedals 1 time.

2. Insert existing master key into ignition.

3. Within 15 seconds depress and release accelerator pedal 5 times.

4. Within 20 seconds depress and release the brake pedal 6 times and remove key.

5. Within 10 seconds insert new key into ignition.

6. Within 10 seconds depress and release the accelerator pedal 1 time.

7. After 80 seconds new key is registered and security light goes off.

8. Remove new key and depress and release brake pedal 1 time.

These are the programming procedures for Lexus RX300 (DOORS)

A. 1. Open drivers door

2. Insert your key in the ignition, then remove it.

3. Using the inside power lock button, cycle the locks locked/unlocked 5 times,

leaving them in the unlocked position.

4. Close and open the driver's door.

5. Again, cycle the locks locked/unlocked 5 times, leaving them in the unlocked position.

6. Insert the key in the ignition and turn it one time to ON position, then OFF.

7. Remove the key from the ignition.

8. The power locks should cycle once to indicate you are in the program mode.

9. Press the lock and unlock buttons together. Then, press any keyremote transmitter button for a minimum of 1 second.

The locks should cycle only once. If they cycle twice, you are still in program mode,

Close and open the door. you need to try and press the button again.

I have discovered all problems are associated with how long you hold both buttons down initially,

and how quickly you press either the lock or unlock button. Experiment with slightly

different amounts of time...

[SKperformance]

I thought before you begin for the wireless lock/unlock program for the key,you have to have the

doors closed except drivers

all doors locked except the drivers

[pushatam]

umm, not sure about what you said SKperformance, you could be right. but the instructions worked good for me. i got it from this guy on ebay from i purchased the key from.

[sirsatman]

umm, not sure about what you said SKperformance, you could be right. but the instructions worked good for me. i got it from this guy on ebay from i purchased the key from.

Thanks pushatam... the instructions I got with the keys I purchased online left out step (1) of the transponder programming.. wasn't working too good till I found your post... Thanks!!