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S-10 & Blazer 1982-2005
The S-10 and Blazer was arguably the most versatile and accessorizable mid-size truck and SUV on the market.
Platform: S/T-series & GMT 330

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  #1  
Old 09-02-2007, 08:43 PM
 
Join Date: Sep 2007
Posts: 3
Default security system malfunctioning

i have a 2002 s 10 4x4, 4.3 ltr. ...i just purchased this 2 weeks ago...the security system is malfunctioning. (truck wont start) this has happened 2 times now.it spent a day at the dealership and mechanic cold not find problem. it didnt through any codes so he could diagnose it. does anyone have any suggestions or know what may be wrong?? HELP!!
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  #2  
Old 09-04-2007, 08:15 AM
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Join Date: Oct 2006
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Posts: 611
Default RE: security system malfunctioning

That vehicle will have the Passlock II anti-theft system which disables the fuel pump and prevents the vehicle from running therefore preventing a thief to drive it away. It's doing it's job unfortunately at the wrong time. If the security light is on when this happens to you then likely it's malfunctioning.

Basically ... the ignition switch has a unique resistance value specific to that vehicle the BCM reads and is programmed to. If someone tried to start the vehicle without the key the BCM will not see that signal from the switch and shut down the fuel pump.

You likely have two options :

1 - replace the ignition switch ... this will require reprogramming the new switch with BCM which is a dealer fix.

2 - bypass the security function from the switch by inserting the same resistance value ( within 1% ) but this defeats the intended purpose of the anti-theft
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  #3  
Old 09-04-2007, 11:17 AM
 
Join Date: Sep 2007
Posts: 3
Default RE: security system malfunctioning

thanks golfer!! do you or anyone else know about replacing the ignition, cost & time involved. i know you said it would be a dealer repair. i was just trying to get an idea of the details. also, more info on the by-pass thing. thanks so much!!
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  #4  
Old 09-04-2007, 05:25 PM
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Default RE: security system malfunctioning

I'll send some info. via PM.
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  #5  
Old 08-16-2010, 11:22 AM
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Join Date: Aug 2010
Posts: 1
Default

hi, i am having a similar problem with my 99 chevy s10 blazer..... im extremely frustrated with it... i hav tried several different things 2 fix mine and hav gotten no where with tha damn thing.... about 2 wks ago i went 2 several different places and it was runnin fine until i came 2 my last stop 4 tha day and i cut it off , it sat 4 bout an hour , i went 2 start it 2 leave and it would crank but wouldn't start . i thought it was tha fuel pump but i hav ran a hot wire 2 tha fuel pump and it squirts gas everywhere. i hav checked all tha fuses and relays their all good , i hav changed the ignition switch module, the oil pressure switch so on and so on. my problem is no power getting 2 my fuel pump. the gas gauge isn't even reading. a friend of mine tugged on the grey wire running to/from the fuel pump and it started and ran great til we got 2 the store and it was shut off. it did the same thing again so he pulled on that wire again, but nothing . i had a key made @ walmart and i used it 2 drive home 2 wks b4 all this happened and it was doing fine with it , i have called the dealership 2 ask them bout my problem and questioned whether the key that i had made @ walmart would have caused the security system 2 shut the fuel pump down cause of the key being different, they said that it would hav shut everything down the day that i 1st tried the new key. i am @ witts end with this.... i'm thinking that it might be a short in the main power source to the fuel pump..... please help b4 i blow the thing up .... if you or any1 else has a solution or a fix 4 my problem please please let me know.... here is my direct e-mail please reply 2 it.... luckibear3@yahoo.com
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  #6  
Old 02-14-2011, 12:16 PM
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Join Date: Feb 2011
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I have the same problem with my 98 Chevy Lumina. Unfortunately, I have to pay to fix on a car that is nearing its end of life. I understand this kind of technology on a sports car a high end vehicle, but it is frustrating because it is going to cost almost $600 to replace the ignition switch and I am told the Dealer is the only one who can do this repair. It would be nice if you could get one out of a junkyard, but then who would install it?
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Old 02-14-2011, 12:16 PM
 
 
 
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02, 2000, 2002, carlo, chevrolet, chevy, codes, functions, gm, monte, override, passlock, problem, reprogram, s10, security, system


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