Lexus Troubleshooting Questions? Ask a Lexus Expert
What seems to be wrong with the vehicle? Is this a no start condition that you are experiencing?
Does the security light flash while cranking the engine?
Have you checked to see if there is spark? These have common igniter issues
If the car has spark then the ignition switch is working. I would suspect fuel pump, fuel pump relay or circuit opening relay. I would trying swapping fuel pump relay and circuit open relay around with other relays to verify if they are faulty.
Do you have a voltmeter? To test Pins 1 and 2 on the fuel pump relay socket? should have 12 volts across these when you are cranking.
OK I understand that a lot of parts have been replaced, but a systematic approach to this issue will yield a positive result, we need to verify if this issue is on the fuel pump circuit or on the control side of this relay.
Next step would be to do this same test to the circuit open relay socket.
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