at first your car is getting older and older however the electronic system is also,the electric system box have to be cleaned by an expert or the fuses have to be renew,it would have some powder or dust in it .it would have prevented flowing the electric to cables.. by the way the oxidation on the connectios also come out this kind of problem..

i have been replaced ago,i think it cheap on : http://www.spobd2.com/search/ , you can reference.

Hello
Connect a scan tool to see if mph is registering in data.if it is not registering on scan tool it is likely an issue at trans speed sensor or wiring to PCM. If you do see MPH data on scan tool it is likely a speedometer head issue or wiring issue between PCM and speedometer head. hope this helps.
Joe Boulay
Automotive Technician & Author
joe@joeboulay.com
www.joeboulay.com

Had you tried lens cleaner polish

Your cabin air filter should be behind the glove box. There is a phillips head screw on the lower right hand corner of the box (when open) that should be removed. Then remove the inside knurled knobs at the left and right hand upper corner of the box. You should be able to access the paper filter holder for one of the filters. I think the 2nd filter may be an air filter for your engine compartment.

Several possibilities; incorrect coolant mixture (not at 50/50 anti-freeze and water mixture), faulty heater control valve, faulty / clogged heater core, faulty / clogged heater hoses, faulty heater blower motor, faulty blower relay or fuse.

Check the sensor. I believe its near the gas tank behind the seat

JR, I have had various, similar kinds of trouble with the instrument panel in my 1993 LS400 over the years (I still have it and love it). First, DO NOT take this problem to any dealer or another garage, even a Lexus specialty garage. Enormous waste of $$$. Around the country there are lots of businesses that specialize in repairing instrument panels and some of them actually know their stuff.
Other people may have their favorites, but the series of problems I experienced over the years allowed me to weed out some of the bad "instrument panel" repair shops and find a reliable one. By far, the best, cheapest and most reliable outfit is BBA Remanufacturing Inc., 300 Miles Standish Blvd., Taunton, MA, Ph: 1-866-573-2740. You can pull out the instrument panel yourself with remarkably ease (granted, doing it five times increased my skill.) BBA will send, maybe email, you instructions if you need them. Basically, you will remove a couple of small paned sections, starting with the one around your car key insert, then unscrew 3 Phillips head screws you can feel (but not see) along the top of the panel itself, then unplug a couple of small connectors from the plastic front - these are fussy but each has a place where a small tool will release the locking clip and then you can gently slide them apart with your fingers or wiggle something between them to pry them apart and then slide out the front part and put it aside (in a protective box or something). Next you will probably have to start sliding the instrument panel itself out and wiggle your hand behind it to unplug three larger connector sections from the rear of the panel itself - this will be challenging but if you can commandeer a small child to reach behind and aid him or her by unlocling the clip, usually in the centerof the connector, with a small pry tool, they will eventuall come free and then the panel can be wiggled out - it helps to have set your steering column to its lowest point - I started out removing the cover to the steering column then later discovered it wasn't necessary. Once the panel is in your lap, BBA will send you a UPS address label for you to paste on a box in which you have carefully, with lots of cushioning, packed the panel. UPS will pick up the next day and in about 10 days or 2 weeks, your panel will be returned to you for re-installation in roughly the reverse order of actions described above. They will charge between $200 and $300 depending on how many problems you have to fix. Shipping costs - both ways - may total $50, probably less. And they give you a guarantee!!! A real one! Mine had more problems about a year after the first fix (by BBA, I don't want to think about the three earlier (one of them 10 times more expensive), stupid, wasted efforts), so I called them and they sent me a shipping label, I sent it to them and it was returned completely fixed in ten days WITHOUT ANY cost to me - not even for shipping! Please let me know if this works for you. David

Judy, I have had exactly this kind of trouble with the instrument panel in my 1993 LS400 (I still have it and love it). First DO NOT take this problem to any dealer or other garage, even a Lexus specialty garage. Enormous waste of huge amount of $$$. You would be shocked by what the dealer will do to you.
Now, other people may have their favorites, but the series of problems I experienced over the years allowed me to weed out some of the bad "instrument panel" repair shops around the country, not to mention ruling out the dealer. By far, the best, cheapest and most reliable outfit is BBA Remanufacturing Inc., 300 Miles Standish Blvd., Taunton, MA, Ph: 1-866-573-2740. You can pull out the instrument panel yourself with remarkably ease (granted, doing it five times increased my skill.) BBA will send, maybe email, you instructions if you need them. Basically, you will remove a couple of small panel sections, starting with the one around your car key insert, then unscrew 3 screws on the TOP of the panel itself, You can't see these except with a mirror but your fingers will find then easily. Use a Phillips head, short screwdriver. The one in the trunk repair kit, left side, will probably work. When these are out, slide out the plastic front, disconnect it from a couple of connectors and put it aside (in a protective box or something) - the connectors are fussy but each has a place where a small tool will release a locking clip and then you can gently slide them apart with your fingers or wiggle something between them to pry them apart. Next start sliding the panel out and wiggle your hand behind it to unplug three, much longer connector sectiions from rear of the panel itself - this will be challenging but if you can commandeer a small child to reach behind and aid him or her by unlocking the clip, usually in the center of the connector, with a small pry tool, all three will eventually come free and then the panel can be wiggled out - it helps to have set your steering column to its lowest point - I started out removing the cover on the steering column & later discovered it wasn't necessary. Once the panel is in your lap, BBA will send you a UPS address label for you to paste on a box in which you have carefully, with lots of cushioning, packed the panel. UPS will pick it up the next day and in about 10 days or 2 weeks, your panel will be returned to you for re-installation in roughly the reverse order of actions described above. They will charge between $200 and $300 depending on how many problems you have to fix. Shipping costs - both ways - may total $50, probably less. And they give you a guarantee!!! A Real One! Mine had more problems about a year after their first fix (by BBA, I don't want to think about the three earlier (one of them10 times more expensive), stupid, wasted efforts), so I called them. They sent me a free shipping label, I shipped it to them and it was returned completely fixed in ten days WITHOUT ANY charges to me - not even for shipping. Please let me know if this works for you. David

Dan, my name is David W Rynders and I have had various kinds of trouble with the instrument panel in my 1993 LS400 over the years (I still have it and love it). First DO NOT take this problem to any dealer or other garage, even a Lexus specialty garage. Enormous waste of $$$.
Other people may have their favorites, but the series of problems I experienced did allow me to weed out some of the bad "instrument panel" repair shops around the country. My experience: By far, the best, cheapest and most reliable outfit is BBA Remanufacturing Inc., 300 Miles Standish Blvd., Taunton, MA, Ph: 1-866-573-2740. You can pull out the instrument panel yourself with remarkably ease (granted, doing it five times increased my skill.) BBA will send, maybe email, you instructions if you need them. Basicall, you will remove a couple of small paned sections, unscrew 3 or 4 screws along the top of the panel itself, slide out the front and put it aside (in a protective box or something), then unplug a couple of small connectors - these are fussy but each has a place where a small tool will release the locking clip and then you can gently slide them apart with your fingers or wiggle something between them to pry them apart. Next you will probably have to start sliding the panel out and wiggle your hand behind it to unplug several larger connector sectiions from rear of the panel itself - this will be challenging but if you can commandeer a small child to reach behind and aid him or her by unlocling the clip, usually in the centerof the connector, with a small pry tool, they will eventuall come free and then the panel can be wiggled out - it helps to have set your steering column to its lowest point - I started out removing the cover to the steering panel then discovered it wasn't necessary. Once the panel is in your lap, BBA will send you a UPS address label for you to paste on a box in which you have carefully, with lots of cushioning, packed the panel. UPS will pick up the next day and in about 10 days or 2 weeks, your panel will be returned to you for re-installation in roughly the reverse order of actions described above. They will charge between $200 and $300 depending on how many problems you have to fix. Shipping costs - both ways - may total $50, probably less. And they give you a guarantee!!! A real one! Mine had more problems about a year after the first fix (by BBA, I don't want to think about the three earlier, stupid, wasted efforts), & I called them and they sent me a shipping label, I shipped it to them and it was returned completely fixed in ten days WITHOUT ANY cost to me - not even for shipping. Please let me know if this works for you. David