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1990LS400

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Everything posted by 1990LS400

  1. The most common cause of this problem is failure of the stop light switch on the brake pedal arm. Are your brake lights lighting up when you press the brake pedal? OEM brake light switches sell for gen 1 LS400 sell for around $75 but I see aftermarket ones online for far less. Autozone has several brands of them for as little as $27.
  2. I'm also seeing the left and right turn signal wires only at the driver side junction block and combination meter in your electrical diagram - surprising. I see the right sign turn signal wire color (G-Y) referenced at the bottom of the diagram for the passenger side junction block but not on the diagram itself which is confusing. Looking at electrical diagrams on a small laptop PC screen is NOT my favorite activity! It's possible that the LS430 is different than other recent vehicles from Toyota in this respect. Or maybe only the UK/European version of the wiring diagram shows the tur
  3. There are likely turn signal wires on connectors to the junction blocks near the kick panels in both the driver and passenger sides as there have been on most vehicles made by Toyota in the past few decades. When I added mirror covers with turn signals to our 2012 Prius v, I used an inexpensive unpowered 12V test light to locate the turn signal wires in its similar junction block connectors near the driver and passenger side kick panels. But if you want to use the power source you already found, you should be able to run a wire above the lower trim panel on the driver side, behind the au
  4. There are a LOT of reviews for the gen 4 RX Curt and Draw-Tite hitches on the etrailer website. People seem pleased with them. I see that the installation difficulty rating for both is "3 out of 10" which is about the easiest rating that etrailer gives for installing receiver hitches. I've bought a lot of stuff from etrailer including the receiver hitches on our current vehicles, wiring harnesses, bike racks, etc. The appearance of the Curt hitches I've bought has held up a little better than the only Draw-Tite hitch I've bought but that may have been a coincidence. There are a lo
  5. The battery in one or more of your TPMS sensors may have failed. An internet search indicates that the batteries last between 5 and 10 years. My understanding is that the batteries cannot be replaced and that it is necessary to purchase new sensors and reprogram the vehicle ECU with the ID codes.
  6. I've used a mechanics stethoscope several times to track down interior noises. They are fairly cheap ... I see one online for about $12. Sometimes I've had someone else drive while I probed around the interior with my stethoscope. The sources of the noises have usually been something rattling around in the center console, glove compartment or door pocket. The source of a particularly nasty buzz turned out to be a loose setting in a ring on my right hand which was pretty funny - the buzz occurred only when my right hand was on the steering wheel. Another common source of buzzes
  7. The hydraulic hood support struts are worn out. A sign of wear is when they keep the hood up in warm weather but not in colder weather. Here are the OEM part numbers from https://www.toyodiy.com/ SUPPORT ASSY, HOOD, RH - 53440-0E020 SUPPORT ASSY, HOOD, LH - 53450-0E010 Googling the part numbers should find both OEM and aftermarket replacements. They are fairly easy to replace. I've replaced several sets
  8. It has been 17 years since I sold my 1990 LS400 so my memory could be hazy. Can you essentially deactivate the tilt/telescope by moving the steering wheel to your preferred driving position and then setting the Auto button on the left side of the steering column to its "off" position? The "off" position for this button is when it is extended. The 1990 LS400 owners manual shows fuse #27 as being for the steering wheel and seat belt anchor but pulling it will also deactivate the power windows and sunroof. I don't know if the tilt/telescope can be deactivate through the diagnostic port.
  9. It is usually necessary to pull audio system head units to access their antenna connections. If you are going to the trouble of pulling the head unit, consider installing a device that allows you to stream audio from your phone through an aux-in cord or wirelessly through Bluetooth which should provide far better sound quality than an FM modulator. VAIS Tech has been selling these interfaces probably longer than anyone else. Stores like Best Buy might have them too or just do an internet search. I see some on Amazon. Here is a link to the VAIS website: https://www.vaistech.com/ Here
  10. Summarizing the three methods for carrying bikes that have been mentioned in this thread: 1. Use a general purpose bike rack that attaches to the trunk/hatch door with straps. 2. Buy the UX cross bars and attachments for carrying bikes on the roof. 3. Have a custom receiver hitch fabricated and use a hitch mount bike rack. I can think of a forth option but it would likely be the most expensive one. Buy the European market hitch for the UX and the European market bike rack that can be mounted on it. I bought European market parts from a Lexus dealer in London in the earl
  11. A suggestion is to read the previous posts in this thread and take action based on what others have found.
  12. YO! I found them in the roof panel / back glass diagram! They aren't shown as a separate replaceable part which probably means that they are welded in place. You must really hate those suckers to want to remove them. There aren't many SC430's left on the road. I doubt if I see one a year and it's probably the same one I sometimes see at the Costco gas pump. Edit: OK, I found a photo showing the roll bars inside the head rest covers.
  13. Here is a link to a old thread on the Club Lexus forum about it: https://www.clublexus.com/forums/sc430-2nd-gen-2001-2010/133149-roll-over-protection.html There seems to be a dispute in the thread about whether or not these things are roll bars. One person said that Lexus corporate said they weren't and another quoted a brochure that says they are. Roll bars are not shown in the parts diagram for the 2002 SC430 - at least in the rear seat diagram. Were they available in a later model year? If so, could a prior owner have adapted them from a newer model? Could your roll bars be a
  14. The SC430 does not have roll bars. The covers behind the rear headrests are only that - cosmetic covers. Looking at the parts diagrams, it appears that the covers behind the headrests are held in place by screws or bolts.
  15. You could probably have a receiver hitch fabricated without going to Arizona to have it done. Some full service trailer supply companies fabricate receiver hitches. There's one near me here in the Kansas City area and you might find one or more where you live if you check around.
  16. A number of component problems can cause limp mode. The only time it happened on my similar 2000 LS400 was when either the pedal position sensor (PPS) or throttle position sensor (TPS) started to fail. There are instructions in the repair manuals on how to test these sensors. The sensors are rather expensive so you don't want to replace them blindly without confirming that they are defective. It my case, one of the sensors was intermittently failing (I forgot which sensor) and the other shown signs of weakness when tested. I went ahead and had both sensors replaced by an independent repai
  17. Your mechanic "guessed"? Maybe you need a technician with diagnostic skills ... perhaps a Lexus dealership.
  18. Having owned a similar 1990 LS400 from new until 2003, I would suspect that your performance issue is in the induction system and most likely in the throttle body. The throttle body is easily damaged. This is something best left to a professional technician. Your speedometer problem is is most likely in the speedometer itself. it is extremely common for the needle to stick, occasionally operate and be inaccurate. These guys should be able to help you: https://www.taninautoelectronix.com/
  19. Are the bulbs in good condition? Bulbs can deteriorate over time with the glass globes becoming brownish and inhibiting light. You could add one or more additional backup light units - perhaps attached to the bumper cover. Google "backup lights" and you should find aftermarket units. The attached photo shows rear fog lights that I installed on two vehicles. The same seller on eBay Germany has backup lights that look identical. I had to fabricate "L" brackets to install them. You would have to tap into the backup light circuit on your RX.
  20. I drove LS sedans for 24 straight years - a 1990 purchased new and an off lease 2000 that I bought at 38,000 miles in 2003. I owned the 1990 until a few months after I bought the 2000 LS which I drove until 2014. I spent at least $1,000/year on maintenance and repairs on each vehicle during the final several years I owned them. Lexus LS are wonderful vehicles but they are expensive to maintain if you keep everything working properly. I probably "over maintained" these cars. Synthetic oil and filter changes every 5,000 miles and transmission and differential fluid changes every 30,000
  21. I can't tell you where the problem is but only that the ABS system has been one of the causes mentioned n past threads on the Club Lexus forum. Maybe a Lexus dealership tech can diagnose the problem - it's beyond my skills.
  22. Well ... it can take a lot of cash to keep these cars going as they age. I spent around $1,000 per year on repairs and maintenance in the last several years I owned the 1990 LS400 that I bought new and sold in 2003. Maybe advertise it on Craigslist. There are people out there who value these cars.
  23. The LS430 used a somewhat crude method that senses tire rotation using the four ABS sensors and compares the rotation rates to determine if one is different from the others. If all the tires match and have similar wear, then the problem could be in the ABS system. Yours is a fairly common problem.
  24. It's the originator of this thread that needed the information - not me. I use the same resources but through the Johnson County Kansas public library. I don't recommend these resources to people on forums since many people don't have library cards, some libraries don't allow online access and many libraries don't subscribe to these resources. We are fortunate that our libraries in Kansas for our libraries to do.
  25. https://www.taninautoelectronix.com/product/1990-2000-lexus-ls400-instrument-cluster-repair/
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