When starting the car, place the key in ignition and all of the electrical components will come on including steering wheel moving into driving position.Sometimes the car will start normal and then other times it will not start at all.If you turn the switch and start the process over when it fails it may fire up right away or it may not.Help.
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Best guess is the Solinoid (on top of the Starter) is the cause.
There will be a Main cable from the battery bolted onto the Solinoid. Near this (a separate terminal) will be a much thinner wire. This supplies the current from the ign. Sw. to the Solinoid.
Disconnect it. Re-Connect the battery.
If this doesn't fix the problem, Repair the Starter Motor.
If this fixes the problem, turn the Ign. Sw. on and touch the wire back to the terminal.
If the problem is back, the problem is the Ign. Sw.
Well, first, the battery is not dead. You could have a poor electrical connection somewhere between the battery, starter, ignition switch, or another component of your start circuit, or possibly a failing starter solenoid, or ignition switch. Some electrical testing will be necessary to find the problem. A quick check the next time it won't crank over, is to pull the starter solenoid wire off and check for power on the wire when key is held in crank position. If power then, probably a failing starter solenoid. If no power there, then you have to diagnose the start circuit back through the ignition switch to the battery. Are all your battery and ground connections clean and tight? Starter connections? Use process of elimination, use care, and you'll find the problem.
Do you have the Owner's Manual? If so, look in it for the way to deactivate the Alarm when the battery has been disconnected. This is only for the FACTORY Lexus alarm. If yours is non-factory you'll need to 'google' the alarm brand and 'how to turn off'.