Question about 2003 Chevrolet Impala

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Security system light goes on, fue blows for power door, trunk

I can drive my 2002 Impala sometimes for days, sometimes for a few minutes and the security light comes on. When I shut the car off, it seems to reset and it may come back on. code reader showed short in driver door power lock. replaced this. check engine light then displayed and replaced the trunk lock. Lately car was started, lost my PRND321 display, error display then showed security, check engine. I shut car off, it didn't restart. could not open or close windows. towed to garage. they opened and closed the connection (next to fan belt unit) and the car restarted. They are puzzeled, and I am getting tired paying to have it "fixed" only to keep blowing fuses (same one) and having an unreliable car.

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Have the system check by a locksmith

Posted on Jul 29, 2009


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1 Answer

How to reset security system

have key in hand. Lock door from outside vehicle and attempt to open with key again. May have bad lock assy. Otherwise try disconnection of the battery. Let sit for 10 minutes. Reconnect battery to reset computer and attempt to unlock vehicle and start vehicle. May have to be reset with some typer of diagnostic scanner.

Jan 19, 2013 | 2002 Chevrolet Impala

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2001 chevy impala security light, turn signals, power locks

I suggest that you go to the dealer for help, because they will know if the problem has occurred before, and how to fix it.

Nov 15, 2011 | 2001 Chevrolet Impala

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2002 impala, no crank

what makes you think someone tried to steal it? the security light issue is a very common problem with GM cars equipped with the Passlock II anti-theft system. just a few days ago my 2003 impala did the same thing in front of a 7-11. took me about 10-15 minuts to get it started. i just kept turning the key on, tried to crank it, and turned the key off numerous times. i had a 1999 malibu that did the same thing and i replaced the ignition cylinder and keys. that cost me about $160 but it solved the problem. changing it out is fairly simple. if thats the route you have to/ need to go i can walk you through it. unfortunately however, GM, although this is a very common occurance, will not issue a recall to fix the problem.

Nov 09, 2011 | 2002 Chevrolet Impala

1 Answer

Security light flashes car wont start

It's could be your PassLock security system that is failing. It started happening earlier this year on my 2002 Impala. If you wait about 20 minutes, it's starts right up after it resets. It started to happen every couple weeks and then every couple days, after a few months. I ended up bypassing the security by soldering in some resistors.

See the pictures at:
It took me about two hours to take apart the dash and carefuly double check everything I did, and take pictures. If I did it again... maybe 45-60 minutes (plus getting resistors).
I was lucky to have some resistors close to what I needed, so it cost me nothing but some time.

My ignition resistance checked at 1250 ohms. I used three resistors totaling about 1400 ohms. (At least according to my $10 meter).
Seems to work, even after I disconnected & reconnected the battery.

Sep 08, 2011 | 2005 Chevrolet Impala

1 Answer

My 2002 Impala is having electrical problems. The cruise control stopped working, the power locks makes clicking noises and sometimes will not work and the trunk opened on its own. What is wrong?

Could be a shorted out or damaged power door lock module. I had a 1990 Oldsmobile Cutlass Calais that had corrosion on the contacts of the module that when cleaned worked fine. Before that, the power door locks would lock the doors inexplicably.

For the cruise, I would check the fuse first.

Also, parts are probably still available for your car since it was made 8 years ago, which falls under the 10 year limit.

Jul 06, 2010 | 2002 Chevrolet Impala

2 Answers

2001 chevy impala security light keeps coming on

This is a problem with chevy vehicles that have the system theft light. after a couple of years of using the key, the lock tumblers inside the ignition switch tend to wear out and so causing the system to think it's being stolen. Now you have to put the key in and turn the ignition to the on position, without cranking the car and leave it for 10 minutes until the theft light goes out. Very annoying especially if you're in a hurry. The dealer cost to repair the ignition switch goes for about $600-$800. that includes re-teaching the key.

Feb 11, 2010 | 2001 Chevrolet Impala

2 Answers

My 2002 Grand am is have a passlock problem. The

I discovered the hard way- ($85.00 later) Step 1: turn key to "on" position. step 2: open driver door. (security light should be flashing on and off) step 3: wait ten minutes with key in "on position and driver door open. step 4: when 10 minutes is up-(youll know-because security light will have stoped flashing after 10 minutes) close driver door ,turn key to "off" position, then turn key "on" to start. drives me crazy!! I have to do it to mine sometimes 2-5 times a day! GM doesnt have a fuel reset button etc. like fords do.

Jul 17, 2009 | 2002 Pontiac Grand Am

1 Answer

No security system beep when vehicle is locked

check to see if your "interior cabin lights" fuse isnt blown it is a 15amp fuse one of the top two rows in your fuse box. i have a 2002 A4 avant and when that fuse blows my security beep doesnt make any sound but the doors lock.

Dec 02, 2008 | 2002 Audi A4

1 Answer

Security Light always on, door lock fuse keeps blowing

This is most likely a problem with your Passlock anti-theft system which is known issue with these cars. Passlock is a "passive" anti-theft system, which means that it will disable your ability to start the car if it thinks there is a problem. The three components that can cause this are: 1) Ignition Switch, 2) Ignition Cylinder, 3) Body Control Module (computer). The dealer is the only one who can solve this problem (unless you can bypass it, but it is not that easy). Estimated repair from most dealers is $800 and up.

Nov 19, 2008 | 2002 Chevrolet Impala

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