Question about 1998 Lexus LS 400

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I blew some fuses in my 1998 Lexus ls 400, I replaced most of them but my accelerator won't work, is there another fuse or relay for that?

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  • michelle1122 Jun 22, 2009

    Here is what happened. I forgot to close the driver's door tightly enough last night. This morning, I was trying to jump start from
    another car but unfortunately I got the positive and negative wrong on my Lexus. It burned down the 120A fuse. I replaced it and did the jump again. Now, the accelerator doesn't work, and transmission is
    not good either.
    Please advise. Thanks

  • michelle1122 Jun 22, 2009


    Did you mean the box right next to the battery?
    I did check that one.

  • AnubisLXXV May 11, 2010

    The Lexus has a lot of electronics on board, so not all the fuses are in one place. If you're lucky enough to have the owner's manual, it should direct you to the satellite fuse boxes (as they call them in the industry, basically they're just hidden in odd places) Most likely you'll find one under one of the front seats, and there could also be one in the trunk... if you've already checked those, I wish you the best of luck, as it gets more time consuming to find the solution after that. If the transmission is acting up also, you may have a problem with the ECU, or Engine Control Unit. These aren't very patient with jumpstarts in most cars, as it is, but with reverse voltage, things can get tedious very fast. I hope the issue with your car is only a fuse, but if the the fuses all check out, it may be a dealer trip for you. On older cars, you could just go to the junkyard and pick up a used ECU, unplug a massive plug from the old one, plug the massive plug into the new one, starp it all down, and be back on the road. With the Lexus and it's security system, however, the keys need to be coded to the new unit, so that the car doesn't think it's being stolen. On the other hand, the antitheft system could be what's causing the trouble you have now, but I doubt it. The system on the LS400 is designed to shut you out completely, meaning the engine wouldn't even start. The ECU in the Lexus is smart enough to be annoying, in that if it's getting a bad reading from something, or THINKS it's getting a bad reading from say, a transmission pressure sensor, or an oil pressure sensor, that'll throw it out of whack. All the same, the power of coincidence is strong. Pop the hood, and follow the air intake up to the throttle body, which should be an aluminum bit with a few plugs and a thin rubber vacuum line on it... This is where the Throttle Position Sensor is. These are a known weak point on Toyotas. They're better than they were, but make sure those plugs on the throttle body are clean inside, and that the wires aren't burnt or suspisious looking. also make sure the vacuum line isn't loose or cracked. Do you have a Check Engine light on? I hope you don't get stranded with this problem, the LS is a nice way to get around.

  • AnubisLXXV May 11, 2010

    To better solve this problem, it's important to know how the fuses got blown... was the car flooded? accident? stereo install? something else?



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Check under the hood for more fuses.

Posted on Jun 22, 2009

  • chrisbock Jun 23, 2009

    it sounds like you may have fried some components on the cars computer unfortunatly the fuse is only good to save your wireing not your computer. you will need to take it to the dealer. this problem is going to vex them too. and get your check book out. if you fried the computer i would look real hard at replacing the car in the near future. reverse polarity of that magnatude can cause damage to components that dont show up for some time it will stress them thay may be fine now but give them a few months and you may regret not upgrading. Sorry



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SOURCE: I blew some fuses in

check under ur hood there is a relay box for that

Posted on Nov 27, 2008

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