Question about 2004 Chevrolet TrailBlazer

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Sometimes when I try and start my 2004 Chevy Trailblazer, it doesn't turn over because of the security light blinking. We have to put key in accessory mode for 10 mins., until light quits blinking. This has to be done 3 times.

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  • Chevrolet Master
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This just happened to me last month. I got alot of info off this site. http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Apr 09, 2011

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Posted on Jan 02, 2017

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I can't start my 2002 chevy trailblazer after battery change. my keyless entry is damage and i fear it is the anti theft security system not allowing it to kick over, any suggestion to start?


Is the security light flashing? If it is, put the key in and turn all the way but don't start. Leave on for 10 min. Or until the security light stops flashing. Turn off and then try to start.

Apr 10, 2016 | 2002 Chevrolet TrailBlazer

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How do you unlock the security system on a 2004 grand am?


Put the key ignition to the ON switch for 15 minutes, when the light start blinking (or a beep sound goes on), turn the key to OFF, remove the key (you have to remove it) then start the car again. If it doesn't work, do the whole process for 30 minutes wait instead of 15 minutes. Good luck, there are video also for bypassing the passlock security in youtube.

Mar 16, 2015 | 2004 Pontiac Grand Am

1 Answer

There's no power to my 2004 Chevy trailblazer keys won't come out the ignition how can I start the ignition?


You have to have power to remove the key. There is a cable to the shifter that is hold the key from turning completely off. Put some pwoer to it and it will release.

Aug 09, 2014 | 2004 Chevrolet TrailBlazer

1 Answer

2004 trailblazer problems


Check for OBD2 codes, primarily a code indicating PCM memory is corrupt. My Trailblazer at times wouldn't turn over and start. Nothing at the key. When you attempt to start the vehicle and you turn the key to the start position, the PCM sends a signal to the starter relay to start the engine. Youtube video showed a mechanic warming the PCM with a hair dryer, and it would start. Tried it on mine and it started fine. If it is the PCM, the remedy is PCM replacement. Got mine from pcmforless.com about $100.00. They had to program the new PCM with the vehicle vin number. Once installed no more problems.

Apr 04, 2014 | 2004 Chevrolet TrailBlazer

1 Answer

My 2004 mountaineer does not do anything when you try to start the car, lights and radio work. security light blinks rapidly when i try to start, but car does not even try to turn over, any suggestions


Security is set. Lock the car up. open it with the key and turn it on. this usually resets the security. If it doesn't use the key fob while its still on and unlock it.

Aug 14, 2011 | 2004 Mercury Mountaineer

1 Answer

I bought a Chevy Trailblazer, used, had keyless remote access Viper Alarm after manufacturer. Had trouble with transmission and alarm....took to Chevy dealer they replaced transmission. Now the remote...


You need to find the black push button called the valet button. That is the overide. Get in the car turn the key to IGN as the alarm is going off and then you have either 5 or 10 seconds to push that button once and then 2-5 seconds later the alarm is shut off. To put the car into valet mode which means no alarm at all you put the key to IGN push that button once then pull key out at which point the blue light should turn solid blue.

Or option two is you open a door and hit the lock, then unlock, then lock button again on the remote and the blue led will be solid which means no crazy alarm.

Mar 08, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

How do i reset the security system on my 2003 chevy impala


Are you reffering to the alarm or the pass lock system that put the theft light on.....If its the alarm the put the key in the door and unlock it. If its the pass lock system put the key in the ignition and turn it on and try to start the vehicle. After it shuts itself off leave the key on for ten min until the theft light stops flashing the turn key off and try to start it again. This may take a few times....

Jul 24, 2009 | 2003 Chevrolet Impala

1 Answer

I have a 2004 chevy trailblazer and i think the anti-theft system turned on and it won't let me start my car but everything else goes on. This happend to me before and i had no car for a week and someone...


put key in ignition turn to the on position for ten minutes. dont touch it watch the security light on dash . after 10 minutes it should be off. if it is off turn ignition switch off for 5 secs. then proceed in cranking it. if security light dont turn off. you have bcm problems. it have to be towed in.

Apr 07, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

Why is security light blinking on a chevrolet trailblazer and will not crank? we put a new motor in truck and now the security light is blinking and will not crank


That means there is a problem with the VATS System. This sometimes happens when the battery is disconnected for an extended period. You might need to do a relearn for the keys. You can get it done with the right scanner in 5 minutes, but there is a way to do it without one.

Turn the key to the start position, release it to the on position, then leave it on for 11 minutes, then turn it off. Repeat this sequence three times, and on the fourth try it should start if that was the problem.

Mar 30, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Electical problems


Disconnect your battery for 10 min and reconnect try that

Mar 15, 2009 | 2004 Chevrolet TrailBlazer

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