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1990LS400 last won the day on April 24

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  1. You may have the dreaded disease known as TPS - Tight Pants Syndrome. Something in your pants pocket may have pushed against the unlock button to cause the windows to roll down and then against the lock button to lock the doors. I've occasionally had this problem although I've become careful to remove keys and fobs from my pocket when I'm home. You're fortunate that it happened in your garage. It's happened to some when their vehicles were parked outside in the rain. At some point, Lexus vehicles began to come from the factory with this feature set to OFF by default - maybe due to the prevalence of TPS. Unfortunately, only a Lexus dealer can change the setting on the ES350 of generation you have. This and other customizable settings are documented in the Customization section of your owners manual.
  2. If the adaptive distance sensing feature of your cruise control no longer works, the dealer must have deactivated it with Techstream or via an in-dash setting that you can control yourself. Laser based adaptive cruise control was available in all years of the LS430 in the Custom Luxury and Ultra Luxury packages.? Its laser sensor was in the lower grill on the passenger side. The LS430 got radar based adaptive cruise control and automatic emergency braking for the 2004 model year as an option on top of the Custom Luxury and Ultra Luxury packages. It's radar sensor was behind the "L" emblem in the front grill like it is on your LS500. Radar based adaptive cruise control is one of my favorite features. All our current vehicles have it. I won't even rent a vehicle without it. Even a fully autonomous driving vehicle requires oversight from the driver. One can't just "zone out" while the vehicle is driving itself. Some who have done that have made the news by crashing. I'm rather looking forward to full self driving vehicles. A 700 mile medical related trip last week sure would have been less tiring with that. I would have bought a Tesla with the full autonomous driving option by now if there were enough convenient charging opportunities where we drive or if they had substantially longer range on a charge..
  3. I would expect the actual speed to be slightly less than the speed shown on the speedometer. The difference is usually between one and three mph. After setting the cruise control speed you can adjust the cruise control speed with the steering wheel controls to get it to exactly where you want it. Do you not like the Dynamic Radar Cruise Control? All vehicles manufactured by Toyota since around 2018 have it. It takes some getting used to and even some skill to use efficiently. I've often driven 200 miles or more while using radar cruise control without ever touching the gas or brake pedals.
  4. Sat nav was an extra cost option on the RX300 and RX400h in the U.S. market. Some people bought it. Other people didn't.
  5. Sorry, I didn't understand exactly what you wanted. It is common for forum software to be configured to turn on "follow" by default whenever you post. If you don't want to follow a thread after you post, then immediately turn off following after posting. I assume that this is a forum software configuration setting that could be changed by a forum administrator but many people prefer to automatically follow a thread after posting.
  6. Click on "Follow" in the upper right corner of the window and then click on "Unfollow".
  7. Well I guess you're going to be buying older vehicles for as long as those are available. In the three years since I wrote that, these features have become standard equipment on vehicles made by Toyota including their Lexus vehicles. Other car makers have gone in the same direction and have or are implementing these features and much more.
  8. The warranty on the 2018 ES300h hybrid system is 96 months (8 years) or 100,000 miles - whichever comes first. You can view the warranty information at Toyota hybrid batteries typically last far longer than the warranty period. If they ever do fail, refurbished hybrid batteries are available on the aftermarket. Buy the version you like most. The regular V6 will probably feel faster but the hybrid is no slouch. My view is that the main difference in the way these two versions "feel" is related to the V6 version having a traditional 8-speed transmission and the hybrid version having a CVT - continuously variable transmission. The difference is especially noticeable at highway speeds on steep hills.
  9. Not possible. There are aftermarket products that can run Apple CarPlay and Android Auto that supposedly can be installed in your car. You can see some available products by plugging in your vehicle information at
  10. I suspect that the reason that the reason that Bluetooth phone systems standard in newer vehicles do not turn down HVAC fan speeds is that noise cancelling microphone technology makes it unnecessary. Automatic radio volume increase based on road noise has been around a long time. The volume of radios available in the 1957 Ford Thunderbird increased with speed and the radios also a search feature that would find the next available radio station on the dial. The 1956 Mercedes 190SL 2-seat convertible I drove as a kid even had a turn signal like lever on the steering column that would cause its Becker Mexico radio to find the next station. Mercedes sedans of that era and into the 1960's had optional foot operated switches that would cause the radio to search for the next radio station - pretty sure I have one of those foot operated controls in a box in my garage. These crude radio remote controls could even be attached in series so that each passenger had their own.
  11. The Lexus brand cell phone that was a dealer installed option lowered the HVAC fan speed and muted the audio system while a call was in progress. I even connected an aftermarket Nokia CARK-91 phone system I installed in my second (2000) LS400 to mute the audio system but I didn't bother to connect it to lower the HVAC fan speed. Even when a Lexus phone system was never installed, corrosion of the factory installed cell phone harness in the trunk can cause HVAC and audio system issues.
  12. It sounds like the only keys you have are valet keys. You need a master key to open the trunk with a key. I think you can get a master key if you have a valet key although it might be a little pricey. IIRC, the two LS400's I bought each came with two master keys, one valet key and one wallet key. I'd be hard pressed to find instructions or an old forum thread that tells how to jump the circuit to open the trunk but I think it involves bridging two wires behind the dash mounted trunk switch. A locksmith might even know how to do it. I don't think a physical cable runs from the dash mounted trunk switch back to the trunk lock. I think it is all electric. My memory is fading about it since I sold my last LS400 seven years ago. The keys and fuses are described in your owners manual. If you don't have one or want to view it online I can be viewed without registering at
  13. A fairly common cause of the problems described in this thread is a starter drawing excess amps. Have your starter checked for current draw. The starter in the 2000 LS400 I drove for 11 years developed this problem at something like 150,000 miles. It was a lot of years ago but I seem to remember that having it replaced cost around $800 at an indie repair shop specializing in Lexus.
  14. What kind of paint job are you looking for? Something basic to make your car look a little better or an OEM quality paint job? Prices can range dramatically from a few hundred dollars to many thousands of dollars. Preparation is everything. I've largely stripped cars before I had their bodies painted removing all pieces that weren't going to receive paint, e.g. badges, moldings, headlights, taillights, fog lights, grills. I even removed the windshield on one convertible. Since you're in California, here is a link to an LA Times article about having an entire car painted:
  15. You can check for a filter but don't be surprised if you don't find one. The 1990 LS400 I drove from new to 14 years didn't have one. The first model year that a filter is shown in the parts list is 1992 but I thought that 1993 was the first model year that the North American market gone one. The Lexus organization made quite a big deal when the HEPA filtration system became standard on the LS400 in the North American market. It was an expensive option on the Japanese market Celsior (LS400) in the early years. Ducts in the HVAC system could be clogged with who-knows-what or electric servo motors that open and close flaps in ducts might have failed or the flaps could be stuck. It sounds like the HVAC system is in sad shape if a previous owner capped the heater core and the fan is stuck on high. Debugging the fan speed is further complicated by it being also controlled by the phone system. Even if no phone was installed, corrosion of the factory phone system prewiring can cause all sorts of weird problems including putting the audio system in permanent mute.
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