I would check the circuits at the key switch first. The anti-theft should only affect the starter and engine, not things like power windows.
SOURCE: Car won't start - anti-theft light flashing
it sounds like the immobilizer is faulty. this will shut off the electrical feed to the starter motor. you will need to take it to a garage to get this fixed.
hope this helps.
SOURCE: 1997 ES 300 How to reset anti-theft system when car won't start
With the doors shut, insert the key into the drivers door lock. Lock and unlock the door 5 times. This should reset the system. If that doesn't work you should contact a qualified repair shop.
SOURCE: Anti-theft has engaged
sounds like the transmitter in the key head is defective or it lost programming, try these programing steps, if that doesn't do it u need another key made.
Turn ignition from OFF to RUN 8 times within 10 seconds, with the 8th time ending in RUN. Door
locks will cycle to confirm programming mode.
2. Within 20 seconds press any button on first keyless remote. Door locks will cycle to confirm
programming.
3. Within 20 seconds, press any button on second keyless remote. Door locks will cycle again to
confirm programming.
4. Turn ignition to OFF. Locks will again cycle to indicate end of programming mode.
SOURCE: 2001 Explorer; anti theft light steady; no power to car
take the positive side of the battery off for about 3 seconds and then put it back on to see if this will reset the security code
SOURCE: '97 Cadllac Deville Concours reading "Anti Theft System Problem"
I had the same problem. trying to save money i took it to several auto places who thought they could fix it..... after a lot of money and my 800.00 after market alarm was taken off i had it took to the dealer . They fix it in two hours they put in new switch and key haven't had any problems sence.
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