Question about 2007 Chevrolet Impala LS Sedan New Cars

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Removed battery cables to clean them, car won't start. dash says service anti theft system. what can i do?

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Ignition keys relearn takes about 30 min to do. 30-Minute Learn Procedure 1. Turn ON the ignition, with the engine OFF. 2. Attempt to start the engine, then release the key to ON; the vehicle will not start. 3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF. 4. Turn OFF the ignition switch, and wait 5 seconds. 5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK Important: Turn the Ignition Switch OFF. The vehicle learns the Passlock Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle. 6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password. 7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles. Without a scan tool you may have momentary starter interruptions while history clears itself.

Posted on Nov 16, 2009

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1 Answer

How to disconnect anti theft


It is hard to give a definite answer because I don't know which and how many wires were damaged...Anti theft can be a real HEADACHE.....You can begin by disconnecting battery cables..Use your VIN number for parts,Get new ignition with a programmed factory key from dealer only.....They probably blew certain fuses and or relays when this happened...Or maybe not..Install new ignition connect battery cables..,turn switch on just to check for bad fuses and relays...Disconnect battery again...replace any fuses blown...Connect battery again...( Each time you disconnect battery it resets the computer system and should clear anti theft codes..)..make sure all doors are unlocked by using door remote key fob....Now see if vehicle will crank..If all is done correctly it should start...However I don't know how much damage was done.....It may possibly be too much work to totally disengage anti theft....You could start with removing all fuses and relays related to anti theft but disconnect battery before...I DO NOT RECOMMEND trying to disable the theft system.....You may create more headaches that you want.......Begin by trying what I described just to be safe...!!....

Jan 27, 2015 | 2001 Ford Windstar

2 Answers

Anti theft wont let me start car


The problem may not be with anti-theft but with a bad fuel pump,cam/crank sensor etc. Also, you may try unlocking the drivers door with the key. On most cars that is the standard method for disabling the security system.

Mar 06, 2014 | Isuzu Cars & Trucks

1 Answer

Anti theft won't reset. Battery won't charge. Tries to start on it's own.


The system may be activating because there is not enough power in the battery?
Check the batter connections and power cables.
Are the posts clean and tight.
Are the cables going to the battery, alternator and starter in good condition. Check to see if the insulation on the cables have not worn away some ware along the cables and shorting out.

Feb 23, 2014 | 1997 Ford Expedition

1 Answer

Truck just won't start. Light and everything else has power. Won't crank at all. Anti Theft system was not set and hasn't been used in almost a year. Had this problem a year ago but it


What year?? What I have run into is the Anti Theft cable shorts out causing the intermittent starting issue. I would try removing the cable

Oct 01, 2012 | Cars & Trucks

1 Answer

2004 mustang won't start because of anti theft system


Did you check the battery of the car (maybe loose cable)? but if it just happen suddenly, it might be your altenator that wasn't charging your battery. I think once there's enough power gone through the car then your anti-theft system should work as normal again.

Sep 28, 2012 | 2004 Ford Mustang V6

1 Answer

My battery cable came undone and now my car wont start i know it has something to do with my anti theft system how do i reset it or whatever i just need to get my car started.


Hello Jaclyn...Look under the dash area for a button or, a toggle (valet)
switch. When you locate it, turn on the ignition key, press and hold in the button (little spring loaded micro button, red or black possibly)
until the alarm chirps 1 time. This should over ride the system, and only the keyless entry part, if installed, would still be operating....The LED light in the dash should also go on solid....At this point. the alarm would have reset.
If this had a starter kill relay installed it would now be opened, and the engine would turn over when tried.

You would repeat these steps to go back to user mode to see if this was corrected...i hope this information is helpful...Happy Holidays.

11_24_2011_4_25_27_am.jpg

Nov 24, 2011 | 1998 Toyota Camry

1 Answer

Rx8 2008-My battery was dead after being stored for 5 months. I did not not disconnect the battery (I know I should have). I had my battery jumped with my husband's car. As soon as I connected the cables...


You should have disconnected the battery and fully charged it before starting the car.
The low voltage may have damaged some of the electronic components in the alarm system.
Charge the battery fully, then reconnect it and see if that helps.

Apr 16, 2011 | 2006 Mazda RX-8

1 Answer

No power to anything - how do I reset anti-theft system? Checked battery at Wal-mart - print out says okay low on charge. Charged battery for several hours on slow charge and then fast charge. Battery...


no... no power to anything means like the headlights are inop and such

in that case its a battery or battery cable issue

assuming you have headlights and power to accessories and the vehicle still will not start AND the theft light is flashing then YES your anti-theft system is trying to keep the car from what it thinks is a theft issue

simply pressing the unlock button on your remotes will resolve this

assuming you do not have the remotes then you will need the anti-theft computers reprogrammed at a dealer or good garage

keep us posted

Apr 21, 2010 | 2000 Lincoln Town Car

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