Question about 1991 Lexus LS 400

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I recently had to have the alternator fixed on my 1991 Lexus, and now the car is up and running great. However, now my power locks, radio, heat/air, trunk, mirrors, and steering wheel won't work. My windows, and lights do, but nothing else. I checked some of the fuses, but nothing started working.

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Have you checked both fuse boxes, there is one inside the car and one in the engine between your battery and overflow tank, I had some light problems and found that one of the bigger fuses in the engine compartment was melted so make sure you check both spots

Posted on Apr 01, 2011

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Hatterasnc,

You're alternator has gone bad and the vehicle was running on battery power. The "clicking" sound is your now dead battery that does not have enough power to turn over the starter. You might also want to check your power steering pump for leak. This is a know problem with early LS400s and will most likey be the cause of the alternator failure. I just dropped $1050.00 to fix the very same promblems you have.

Jul 21, 2008 | 1990 Lexus LS 400

1 Answer

My 1991 lexus ls400


The most likely problem is your alternator, the alternator charges your battery while the engine is running, if the alternator is bad you have a dead battery, but you can check with a volt meter to ensure that is your problem. Start your car (use a battery charger or jump to start it if you need to) and put your meter on the battery post's. If your reading 13volts or so your alternator is working and maintaing voltage, however if your reading starts dropping to 10 or less(may take a few moments to drop) then it's probably your alternator. You can also check your battery's voltage before starting your vechile, if the voltage increases after you start the vechile then it seem to be charging. Alternators can be repalced somewhat easily, it's only two boltsm however you do have to remove the fan belt, and re-route after installing the new alternator. If you have some expirence working on cars you can do this yourself in your driveway.
Good luck

Here's a start for you, hope this helps

Jul 18, 2008 | 1991 Lexus LS 400

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