Question about 1990 Ford F150

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Ihave a theft system problem


When the theft light is not flashing the truck will not start.with key off dach lights stay on.If i unhook the battery it will start again will not do all the time

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  • bigdh63 Oct 02, 2009

    thanks for the info

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WHAT YEAR ALSO GEM MOD. ON TOP OF FUSE BOX IF WINDSHEILD LEAKS IT GET WET NO START LIGHTS STAY ON NEVER THE SAME THING

Posted on Sep 28, 2009

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1 Answer

Cranks, but why doesn't it start?


Sounds like your anti theft system is acting up. Try unhooking the battery for 10 min. and hook back up.

Mar 15, 2016 | Cars & Trucks

1 Answer

Vehicle will not start! Replaced the battery but it will still not turn over. Oil light, battery and engine light come on when initially trying to start.


Is the security light on or flashing when trying to start the vehicle .
Anti-Theft The passive anti-theft system (PATS) consists of the following components:
  • Anti-theft indicator
  • Encoded ignition key(s) (the key contains a transponder)
  • PATS transceiver
  • Powertrain control module (PCM)
PATS will disable the vehicle from starting if there is:
  • a damaged PATS key.
  • an unprogrammed PATS key.
  • a non-encoded key (a conventional key or one that does not have any electronics).
  • damaged wiring.
  • a damaged transceiver.
  • a damaged PCM.
If it is a anti-theft system you will have to take it to the dealer .This system will keep the starter from spinning the engine .

Oct 30, 2015 | 2007 Ford Freestyle

1 Answer

2005 for freestyle 4/4 6 cyl wont start battery good theft system light on how do i get it started


you can try unhooking the battery or you may need to go get a new key made from the dealer that has the proper arms of resistance in the key if you can find somebody who knows how to bypass the anti test you can take it to them they can bypass it and you can use any key made for that car off your original key

Oct 07, 2014 | 2005 Ford Freestyle

1 Answer

I have a 2003 chevy malibu that won;t start. When you turn the key to on the Theft System light comes on steady ( no flashing). I t used o go into this mode periodically where the Theft System light...


I have had the same problem. This has happened to me three times in the past nine months or so. Per the owner's manual, you turn the key to the on position and wait about ten minutes. This resets the system and when the "Theft System" light goes out, it starts right up. I did this each time and it started right up.

Jan 02, 2013 | 2003 Chevrolet Malibu

1 Answer

I have a 2003 Isuzu Axiom and I was in a car accident where the doors on drivers side were hit!! The dome lights stayed on then the battery died we unhooked all the inside lights and gave the battery a...


Start at basics, do not assume that this or that is good, verify with a scanner and/or multi-meter if possible.verify that when attempting to start that anti-theft didn't enable. usually icon of key with lock illuminated or theft light flashing, check and see if headlights dim(amperage draw or load) while attempting to start. this will ensure your problem is not anti-theft. if you have access to an obdII scan tool try and pull diagnostic code(s) if present . Question, how long has it been sitting? does your Transponder have a good battery in it? Try closing all doors and with transponder lock and unlock with transponder. some times replacement of battery with doors open will accidentally enable try to reset security feature.. sounds like this is going to be your problem area

Nov 22, 2017 | 2003 Isuzu Axiom

2 Answers

Hi I own A 98 Chevy Malibu, my ignition locked n i had to put a new ignition switch in, well now my cars tellin me Something Theft Service. Im wonder what I need to do? Iv unhooked battery for hours ect...


You need to reset the theft system. To do this, try to start it. It should start and die. Then after it dies and the theft light is flashing, leave the key on for 10 minutes. After 10 min, the theft light should go out. After the theft light goes out, turn off the key. Count to 5, then restart it. Then it should work.

Nov 07, 2010 | 1998 Chevrolet Malibu

1 Answer

1999 Mercury Cougar, Anti-theft light is flashing, car will not turn over, after I try to start it the anti-theft light stays on until I pull the key then it starts flashing. I've looked online for a new...


put key in trun to on do not start or try to start just trun on. wait 10 to 20 min.s with key on this should reset the theft system.after you wait turn key off then try to start.

Aug 26, 2010 | 1999 Mercury Cougar

1 Answer

Car wont start, changed ecm, plugs, started but died, what should i do


After you put in the ecu, do the crank relearn, and you're good to go.
Ensure that your battery is fully charged before attempting the relearn procedure. Do not leave any battery charger or jumper cables attached to the battery. Close the hood completely. Some applications require that the doors remain closed during the procedure.
96-99 GM
1. Rotate the key to the start position to attempt to start the vehicle (the vehicle will not start).
Allow the key to return to the all position (same as if the vehicle would have started). The theft system light will flash (or stay lit) on the dash for approximately 10 minutes.
2. When the theft system telltale stops flashing (or turns oft) turn the key to the off position for 5 seconds and then attempt tostart the vehicle. The vehicle should start on this cycle.
3. Once the vehicle is running, the password relearn is complete.

00 + GM
1. Rotate the key to the start position to attempt to start the vehicle (the vehicle will not start). Allow the key to return to the on position. (same as if the vehicle would have started)
2. The theft system light will flash (or stay lit) on the dash for approximately 10 minutes.
3. When the theft system telltale stops flashing (or turns off) turn the key to the off position for 5 seconds and then attempt to start the vehicle.
4. Repeat steps 1 through 3 two more times for a total of 3 cycles/30 minutes.
5. On the next cycle of turning the ignition key from off to crank the vehicle should start
6. Once the vehicle is running, the password is learned and this completes the cycle.
7. Clear any DTC's with a scan tool if necessary. DTC history will be cleared after 100 ignition cycles.

Thank you for using fixya and keep us posted


Jun 12, 2010 | 1999 Chevrolet Tahoe

2 Answers

99 chevy cavalier theft system light on steady, car wont crank.


My 2000 cavalier has done this for 6 months. You take your key out then open your door, wait ten minutes and the system resets itself and the car will start-annoying you bet!!!

Jul 20, 2009 | Chevrolet Monte Carlo Cars & Trucks

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