Could be the neutral safety switch. Pull out the start relay and interrogate the relay socket with a volt/ohmmeter. One terminal should always show zero ohms to ground. One terminal should show 12vdc when the key is turned to start. One terminal should show a few ohms to ground (this terminal goes to the starter solenoid). The last terminal should show 12vdc from the pcm when the transmission is in park or neutral. This is the signal I suspect you will not get. If I am right, remove the neutral asfety switch and test it with an ohnmeter. Your diagram is at the link below.
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=108661
SOURCE: all dash warning lights came
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.
SOURCE: 95 Lexus ES 300 check engine light is on and the overdrive off light is flashing
chances are you don't have to replace the computer. the reason i tell you this is because you did not mention that the car is running lousy. no complaints of rough idle or missfire or hard starting. chances are that your engine speed sensor which sends the signal to the computer which then controls the transmission is most likely the culprit.. and it could just bhe that there is a loose connection between the two. if that is ok then your transmission control module is faulty. this is not the main computer, but the gobetween the trans and the ecm.. hope this helps please rate this...thanks(btw....the knock sensors control timing not the trans mission)
SOURCE: Ignition won;t start. The key insert is loose and turns but won't start
the ignition switch may need to be replaced. im not sure if a lock smith can replace the ignition switch, call around to see if they can.
SOURCE: Will Not start even if you jump it nothing.
it is absolutely the starter solenoid im not sure if you can replace just the solenoid but you definitely need a new starter / solenoid.
SOURCE: A few days ago my car wouldn't start and just made
While your car is running, measure the voltage at your battery terminals. If the alternator is wotking, it should measure over 13 volts, since the battery is really low. On a healthy battey the voltage is around 14.5 volts when the engine is running. If the car is running and you measured 12.6 volts or less, change the alternator. I have actually worked on a lexus ls400 with exact same problem. I had rebuilt the alternator myself to save the customer on parts. Because altenator is not cheap on lexus. There is an ace hardware by my shop where they carried some carbon brush, all you got to do is file it down to fit, and solder them. Of course you have to open the alternator to do that. The brushes cost about a few bucks. You can buy these at auto parts too but not for that particular alternator. Auto parts like to make money and would rather sell you the whole thing. LOL
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