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irishtwincam

Ls400 Woes: Alarm And Immobiliser

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91 LS400 4.0L v8 - ex UK car I think (no japanese writing on the stereo)

2nd hand car, private purchase.

Only have the ignition key/door key, no key FOB, no key for trunk.

Either trunk lock busted or need a different key for trunk.

Needs a paint job but with a Toyota 4.0 V8, looks werent a concern :)

Car was bought driving the finest :) needed pads on the front right, easy DIY job.

Locked the doors the first night, came out the following day and the car wouldnt start. Immobilised somehow, alarm wailing. Security light pulsed.

Pulled the Battery and turned on electrics to drain any power. Left for 24hrs.

Replaced Battery turned the ignition key, VROOM!

Great...made a note to never lock the car. EVER!

Car drive fine, security light stayed off.

until last night.

Locked the car by mistake, unlocked the car later and the alarm went off.

Put in the ignition key and the alarm stops, starter motor wont swing the engine over.

Pulled the Battery again, but this time it did not work.

Car wont start, alarm goes off and security light stays on.

Tried it again, alarm is still a nusiance but the security light stays off.

Last attempt was to flatten a good Battery and let the security ecus n stuff die!

All lights went out, even the security one. Jumped the lexus off another car.

NO ALARM sounded, this was good. Car still wouldnt start, IMMOBILISED.

Exited the car. Closed then opened the door, alarm went off.

-I need to know, with a fully charged Battery in place, how do I reset the alarm and the immobiliser?

-Can they be reset seperately?

-Can I run a diagnostic like on the corollas and such and check for ecu errors codes? How do I go about it on the LS400?

Irish Lexus dealers didnt sell the LS400 til 1995 or so I was told by a lexus dealer. So I'm screwed there cos they wont help. Found a 4amp fuse on a wire under the dash a a small switch by the accelerator pedal?? Its dark and Im not going near the car again til the morning.

If I can drive the car (immobiliser fixed) I can disable the alarm horn and get to where Im going. Happens to be a funeral at Christmas :(

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91 LS400 4.0L v8 - ex UK car I think (no japanese writing on the stereo)

2nd hand car, private purchase.

Only have the ignition key/door key, no key FOB, no key for trunk.

Either trunk lock busted or need a different key for trunk.

Needs a paint job but with a Toyota 4.0 V8, looks werent a concern :)

Car was bought driving the finest :) needed pads on the front right, easy DIY job.

Locked the doors the first night, came out the following day and the car wouldnt start. Immobilised somehow, alarm wailing. Security light pulsed.

Pulled the battery and turned on electrics to drain any power. Left for 24hrs.

Replaced battery turned the ignition key, VROOM!

Great...made a note to never lock the car. EVER!

Car drive fine, security light stayed off.

until last night.

Locked the car by mistake, unlocked the car later and the alarm went off.

Put in the ignition key and the alarm stops, starter motor wont swing the engine over.

Pulled the battery again, but this time it did not work.

Car wont start, alarm goes off and security light stays on.

Tried it again, alarm is still a nusiance but the security light stays off.

Last attempt was to flatten a good battery and let the security ecus n stuff die!

All lights went out, even the security one. Jumped the lexus off another car.

NO ALARM sounded, this was good. Car still wouldnt start, IMMOBILISED.

Exited the car. Closed then opened the door, alarm went off.

-I need to know, with a fully charged battery in place, how do I reset the alarm and the immobiliser?

-Can they be reset seperately?

-Can I run a diagnostic like on the corollas and such and check for ecu errors codes? How do I go about it on the LS400?

Irish Lexus dealers didnt sell the LS400 til 1995 or so I was told by a lexus dealer. So I'm screwed there cos they wont help. Found a 4amp fuse on a wire under the dash a a small switch by the accelerator pedal?? Its dark and Im not going near the car again til the morning.

If I can drive the car (immobiliser fixed) I can disable the alarm horn and get to where Im going. Happens to be a funeral at Christmas :(

If ser 3 same....there are two different types of key. one operates everything. The other is just a 'Valet parking' key (for USA where you get your car parked for you!). The Valet key won't open the boot or glove box. Yes you should be able to turn the noise off, as there's a little round/circular-in- cross section key you insert into the alarm box under the bomnnet, which allows you to silence the noise. (but doesn't stop the immobilisation, or what would be the point?)

As to immobilsation....there may be threads on this site that deal with this. Or others, more knowledgable than I, will chip in.

Good luck

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I'm sorry to hear of your woes: hope you get them sorted and can enjoy the car properly.

However, I have some sort of flu bug and feel really rough, but your tale made me larf out loud and now I feel a bit better.

Happy New Year!

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Dude, this worked with my GS300. Might help you.

Leave the key in 2nd position, in the steering column for at least 6 minutes. Then remove key. Re-insert key and maybe it will start with no alarm going off.

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I had odd alarm problems when I first got my LS.

It all went away when I fitted a new Battery.

Think poor Battery condition.......make sure yours is fully charged [and good, no duff cells ] :unsure:

As above for key/alarm not silenced problem.

If no joy try the USA LOC, they've got more LS than us! :yawn:

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6minute thing didnt work.

Ive tried most of the alarm immobiliser reset procedures Ive read about.

None work.

Found the diagnostic port so Ill give that a shot to see if something is shot.

Anyone here specifically with a 91 LS400 UK car?

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look on www.clublexus.com - US site that will definitely have the answer.

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Try unlocking all doors manually, not remote......

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91 LS400 4.0L v8 - ex UK car I think (no japanese writing on the stereo)

2nd hand car, private purchase.

Only have the ignition key/door key, no key FOB, no key for trunk.

Either trunk lock busted or need a different key for trunk.

Needs a paint job but with a Toyota 4.0 V8, looks werent a concern

No remote/fob or anything like that.

Just have one key.

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91 LS400 4.0L v8 - ex UK car I think (no japanese writing on the stereo)

2nd hand car, private purchase.

Only have the ignition key/door key, no key FOB, no key for trunk.

Either trunk lock busted or need a different key for trunk.

Needs a paint job but with a Toyota 4.0 V8, looks werent a concern

No remote/fob or anything like that.

Just have one key.

No button on key? Might be worth buying a key off Fleabay, just to have a transponder. I'm sure I've read about ways of programming new keys without having to have the master. A search of this forum (or the Toyota Owners Club forum for that matter - may have similar methods) may turn up the goods. Good luck!

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Simultaneous door lock/unlock didnt work.

Was suggested by Lexus sales person.

Ok,

Can anyone give me an idea where in the engine bay I can tap into the starter +12v wire?

Removing the intake manifold and all that to access the starter is NOT an option.

Im gonna manually switch the starter to get the car started.

Anyone?

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Simultaneous door lock/unlock didnt work.

Was suggested by Lexus sales person.

Ok,

Can anyone give me an idea where in the engine bay I can tap into the starter +12v wire?

Removing the intake manifold and all that to access the starter is NOT an option.

Im gonna manually switch the starter to get the car started.

Anyone?

I doubt that'll do anything, you'll probably find the engine will turn over but not start as the ECU won't want to play ball.

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As exobex suggests I think you are wasting your time. The immobiliser will prevent the car firing even if you manage to turn it, prove this with a push start :(

Think you will need to take it to Lexus and pay their fees.

Also bear in mind nobody on here knows you so people, even if able, will be reluctant to reveal security information.

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...or go here.

As you may now know, if you lose all the keys to a Toyota or Lexus vehicle that has a transponder system it can be very costly because the engine control module unit has to be replaced. We can save you literally hundreds on this.

Call us now on 07836 222213

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