1998 lx470 Cannot add master key

[bobNoobie]

Hi i am trying to add a master key to my 1998 lx
.

I am having trouble. I think At step 13.
At step 13 When i put new key. The lock symbol near the cd player is off instead of blinking. Then continue to step 17.. car will not start.

Now i am thinking maybe I need to delete keys.
But on delete process. I cant get step 8 &9 correct .. because the security light never blink during this process.only on step 10 ( of the delete process) the security light will blink. I don't think i successfully delete all keys except master.

The only think i manage to do is to program the fob to lock and unlock the car.. any ideas?? Thx




B - add an additional MASTER key to the car’s computer

1. Make sure all windows are rolled up and all doors are shut.
2. From outside the car LOCK the car door with the key.
3. From outside the car UNLOCK the car door with the key.
4. Enter vehicle and close the door.
5. Start the car’s engine.
6. Turn engine off and remove key.
7. Place master key in the ignition lock. (DO NOT TURN ON.)
8. Press and release the gas pedal 5 times.
9. Forcefully press and release the brake pedal 6 times.
10. Remove key
11. Place new key in the ignition lock. (DO NOT TURN ON.)
12. Press and release the gas pedal 1 time.
13. Wait (about 1 minute) for security light to stop blinking.
14. Remove new key from the ignition lock.
15. Press brake pedal 1 time to close programming cycle.
16. Wait 15 seconds for programming cycle to end
17. Insert new key into ignition lock and start the vehicle.



A - Delete all keys other than present master key

1. Make sure all windows are rolled up and all doors are shut.
2. From outside the car LOCK the car door with the key.
3. From outside the car UNLOCK the car door with the key.
4. Enter vehicle and close the door.
5. Start the car’s engine.
6. Turn engine off and remove key.
7. Place master key in the ignition lock. (DO NOT TURN ON.)
8. Within 15 seconds press and release the gas pedal 6 times.
9. Within 20 seconds, forcefully press and release the brake pedal 7 times. The Security light will blink.
10. Within 10 seconds, remove the master key. All other keys should be deleted from the car’s computer.

 

[flintknapper]

You can skip steps 2 & 3 if you like. I have found it makes no difference.

Depending upon where you got your 3 button transponder key (4C) it might take several tries. Some of the cheaper ones will NEVER program.

It IS possible that the ECU already has a full compliment of keys programmed to it. IF so...it will not accept another Master until you delete the others. The Delete feature deletes ALL previous keys except the one being used at the time of that procedure.

If you have no blinking light at step #13 then the system has aborted the process. Make sure all of your doors are fully shut and the windows up. When pressing the gas and brake pedals (especially the brake pedal) do so forcefully so that you are certain they are being fully depressed. Also, try doing so a little faster or slower but at a 'cadence' (evenly timed). If after step 12 you do not have a blinking light, then something has gone wrong and you might as well start over.

It is NOT unusual for folks to get 'bad' transponders or the have the WRONG transponder in their key. If either of those things are your issue, you can do the Key Dance until you are blue in the face and it will NEVER program.

 

[camino70]

I didn't have luck with the key dance either. I recommend getting techstream out finding someone local with it to update the keys.
Where are you?

 

[bobNoobie]

Any good source for the transponder only?
My new key works if my oem key right next to the receiver.
And my fob work to unlock and lock.

I just cannot get the security light to accept new key chip.
I use one of the 4c chip that looks like this.

Or do i need transponder chip coil ? Like this? By texas instruments

Factory Anti-Theft Transponder Bypass and Databus Reference Guide

 

[bobNoobie]

I decided to try again with a regular key no fob

Ebay seller guarantee it will work
So i can hope to get a refund if it doesn't work.

I am in Vancouver canada, next if still no luck. I'll ask local forum for some techstream help

Thx u

 

[skhochay]

I have to find my instructions , I did 10 years ago for my LC 2001 I think they are the same , will post by the end of the day

 

[LBridges]

Just to cover some basics...sorry if you had all this down before.

You must have and use a master for the directions to work, and I'm not certain but I think the system will only program up to 5 keys, and hence why there is a delete procedure. There are two possibilities regarding the key you are using as a master (at least for my 2000 model).

a. Security light goes off IMMEDIATELY = MASTER key

b. Security light remains illuminated for 1-3 seconds before going out = VALET key

Well, maybe 3 possibilities - the light never stops blinking - which means it is not programmed for the vehicle.

 

[bobNoobie]

Success. I bought from an ebay seller that guarantee their key will work
.

Did the dance and key worked
Ebay seller is bbblocks
The key i bought that worked is the regular type with no remote. Just straight key and black plastic .no buttons

The dance is just as follows

Add Duplicate Key
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.



Good luck all

 

[Qtonic]

Add Duplicate Key
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.

This worked for my 98 LX470 with eBay remote key for the immobilizer.

This post by @Das Shtig (and the youtuber of course) worked for the remote programming: LX470 2001 - Remote Programing

Key link: For Keyless Entry Remote Car Key Fob Control Replacement Long HYQ1512V - 4C Chip 806315249055 | eBay

Edit: The transponder fits OEM keys and seems like a good way to get a replacement even if you don't need the blank.

Thanks Mud!

 

[Das Shtig]

This worked for my 98 LX470 with eBay remote key for the immobilizer.

This post by @Das Shtig (and the youtuber of course) worked for the remote programming: LX470 2001 - Remote Programing

Key link: For Keyless Entry Remote Car Key Fob Control Replacement Long HYQ1512V - 4C Chip 806315249055 | eBay

Edit: The transponder fits OEM keys and seems like a good way to get a replacement even if you don't need the blank.

Thanks Mud!

Glad that was helpful. Also, I used these keys that come pre-cut. (BLADE-CUT INC) DIY REMOTE ENTRY FOB KEY w/4C CHIP EASY PROGRAM KEYS for LEXUS | eBay
Worked beautifully and didn’t have to go somewhere else to cut it. And then I got a YotaMD titanium reinforced shell from @suprarx7nut

 

[Boethius]

Here's a dumb question. . . .I have a working key and fob but the plastic case that houses the fob is broken. I tried ordering a new one off ebay and it looks to be the correct size and shape but the key itself is blank. Anyone know how I can get the key cut? I called the local toyota dealer and they said they must come pre-cut from the factory. . . doesn't sound right to me. My next step was to try and call a lexus dealer. Any insight is appreciated! Thanks!

 

[Qtonic]

Some locksmiths do it. There is even a place on Amazon selling the keys precut by providing a picture of your old key or an identifying number that the dealer should be able to lookup.

 

[Dg7leon27]

Thanks guys. This thread helped me out a lot. I recently broke my oem key fob and don’t have any spare keys. Got a set from eBay and now I have 3 keys total. I was able to add the 2 eBay keys. Just gotta do the key fob now.

 

[BnvS]

I didn't have luck with the key dance either. I recommend getting techstream out finding someone local with it to update the keys.
Where are you?

@camino70 Do you have techstream? if not I have it and we can try adding the key. I am in Alpharetta. Thx.