Gmach

I ordered a replacement door lock module on ebay...pretty cheap. I'll let you know if makes any difference. Unfortunately ebay is a crap shot at the best of times.

19 hours ago, Exhaustgases said:

I think what the security module does is OPEN the starter solenoid circuit. No reason to have to short one side, but could.

The key deal. Only a lock smith or dealer can do what it required to set it. And the reason why is the information to do any of the security related stuff like that and the radio is only allowed to dealers and qualified lock smiths. That is posted on the Technical information site at Toyota. We all can pay for access to all the other information, just not the security related stuff. So either you need a person that knows how to deal with it or do the above.

Thanks Bob...but tell me, if we buy a key from Lexus (which we did for $400+ dollars) and get the new key with ROM for the door opening receiver module, isn't that all that's required? Putting the ROM in the module and the new key with the new ROM correctly installed in the module (89741-5005) should activate the door locks...correct? No further trips or ransom money paid to Lexus to get the remote door function on the key to work. I ask because the remote still doesn't unlock the doors after the new ROM installed. Tested the key transmit on FM 94.9hz...it works! Locked the doors from the interior then put the key in the ignition / removed it then cycled the master lock control on drivers door x10...locks cycled once, automatically, so it's in diagnostic mode. Pressed remote button on key..NOTHING! Stuck the metal part of the key in the module antenna port and pressed remote button on key..NOTHING. So, it looks like the remote transmit function on the key is working...problem isn't the antenna. All that is left is the module itself ...which is a strange coincidence 'cause it worked just fine before we had the local AAA guy break into the car when the key broke and stopped working.....but maybe...maybe that's why we couldn't open the door in the first place...the module stopped (89741-50050) stopped working !!! Hmmmmm. It could be that unless we still need to make a trip to Lexus after getting the new key and ROM installed....do we?

So, even thought this is a '90 / '91 LS400 with stone age technology it still needs to go to the dealer even though we got a new key and ROM from them..for some outrageous amount of money...we need to pay more for them to do what... ?

....I'm wondering if that's how the security module works. It creates a dead short at / to the starter relay so the car won't start and that is what the scan saw.

Thanks for the reply. I had the car towed home. The battery was dead so I put it on the charger. Tried to start the car this AM and it started. Now, since I had to purchase a new key from Lexus, it came with a new chip for the remote receiver in the trunk. Installed the chip and tested the door locks with the remote key..... but nothing! The doors will not lock with the new key. Is there something else that needs to be programmed to the new chip? The locks all work normally when using the manual switches in the car. Could this failure of the new remote key to work also be related to a bad security module...or could the receiver ECU in the trunk be bad? The Lexus dealer did say their scan should that the security module 89730-50011 had a dead short for the starter relay when the car wouldn't start, just clicked....yet the car does start now. But we now seem to have a parasitic drain on the battery. Any ideas what we need to get the remote (NEW) to waork?

We tried to open the car with the key fob that broke in my hand and stopped working. The key tumblers on both doors are jammed so couldn't use the metal key. Called for a towing service who used a wire to unlock the door from inside..pulled the pin up. Then, when I tried to start the car it just went "click / click" and nothing. Had it towed to a Lexus dealer who said, after testing,  that module is "fried". Obviously we needed a new key so had to order one. The dealer is 100 miles from home so I asked them to try the car with the new key they said it won't start without that module being replaced and re coded....so I'm confused! Any ideas? It seems odd that module suddenly broke simply because we jimmied the door. Is it fair to assume the car has gone into some sorta security setting because of the way be opened it? Shouldn't the replacement key re-set the security system?

This is for a 1991 LS400. Has anybody replaced one of these yet?

If so, can you tell me if it needs to be programmed by Lexus before it will work in the car.

They are no longer available from Lexus so I would have to buy one on line, used.

Also, where is it located and is it hard to remove / replace.?

Thanks

Part Number 89661-50341

This ECU is from a 1997 LS400/5A.
All 6 capacitors have been replaced. These are the reason why these units fail and the car starts acting weird with flashing dash lights or poor shifts among others.
I replaced the capacitors with the correct low ESR quality capacitors.
The unit has been tested and is in like new condition.
$190...email if interested: gmach500@gmail.com

Ok..weird scenario. Driving at 130KPH (Canada) when I went to pass a slower car. I just applied a little accelerator pedal and notice there was nothing there. Didn't change gears, just a slight push on the gas pedal. Form there the car just coasted to the side of the road. Towed the car home. In the morning I started it to see if it would move off the street AND everything was back to normal. Reverse and forward gears OK. Decided to take it to the local store but as the engine temp came up to normal ( mid gauge) once again the transmission stopped responding..just like on the highway. Let it cool down to were the temp gauge was at 1/4..started it and the transmission was normal again...until the engine temp. gets up to normal then the transmission stops working until it (engine) has time to cool off.

I can't image what is going on. Could this be a bad servo do that? I do have a code 63 which is the #2 servo..but could that be the only cause? I didn't think that would completely disable the transmission, just some shifts.

Obviously the heat (engine temp) has something to do with it, but what and how.

I have notice a very slight whining from the transmission with the car in park as I increase the RPM.

Appreciate any input.

Car has been well maintained since new and has 500000 kilometers on it.

I need a pin out / wiring diagram for the instrument cluster in a 1991 LS400.

I need to power it up on the bench so I can see the lights.

Does anyone know the correct wires to connect to power and ground, on the bench? Thanks

OK...worked like a charm. Removed the plastic gear and manually screwed down the steering wheel.

Yeah...it came to me in a dream last night...at least it seemed like a dream althought this car is a nightmare!

Thanks for the link. I think that'll work. I'll update later.

I have a 1990 LS400 that I need to get the instrument cluster out of but we have no key for it so the steering wheel will not move. Anyway to manually lower thye steering wheel?