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Theft System Light on 2004 Chevy Classic
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aglantz
Novice
Oct 13, 2012, 4:50 PM
Post #1 of 10
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Theft System Light on 2004 Chevy Classic
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I have a 2004 Chevy Classic with a 2.2L 4 cyl. My theft system light has been on for a few days but the vehicle still starts. I have had to do the relearn procedure in the past but not lately. I purchased and replaced the lock cylinder that has the passlock sensor on it and the light is still on. While I had the dash still apart I decided to try to start it with the passlock sensor unplugged and it miraculously still started and stayed running. I am lost and looking for more ideas as to what to check next.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 13, 2012, 4:52 PM
Post #2 of 10
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Re: Theft System Light on 2004 Chevy Classic
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I don't see how that is possible if the system hasn't been modified in some way.
How many wires were in that plug and what color wires?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Oct 13, 2012, 4:55 PM)
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aglantz
Novice
Oct 13, 2012, 4:56 PM
Post #3 of 10
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Re: Theft System Light on 2004 Chevy Classic
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I have not modified the system myself, but did notice a bad hack job under the dash (not impressed). The passlock sensor wires had some visible splices but no resistors or anything in them. I cut out the hacks on those 3 and resoldered them. The main yellow ignition wire also had a wierd splice in it which I removed and resoldered back together as well. My neighbor has a scan tool and there is no body codes in the system either.
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Hammer Time
Ultimate Carjunky
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Oct 13, 2012, 4:59 PM
Post #4 of 10
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Re: Theft System Light on 2004 Chevy Classic
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The PCM won't supply injector pulse unless it receives the correct password from the BCM so something is definitely wrong with this scenario.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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aglantz
Novice
Oct 13, 2012, 5:01 PM
Post #5 of 10
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Re: Theft System Light on 2004 Chevy Classic
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The 3 wires were yellow, black, and white. Like I said I am baffled as is the neighbor who is a mechanic as well. I just wish I could get the light to go out as I am tired of looking at it.
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Hammer Time
Ultimate Carjunky
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Oct 13, 2012, 5:05 PM
Post #6 of 10
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Re: Theft System Light on 2004 Chevy Classic
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The system can't operate without the Passlock sensor so something has been messed with there. They make a bypass kit that is used for remote starts and someone may have installed one on there.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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aglantz
Novice
Oct 13, 2012, 5:09 PM
Post #7 of 10
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Re: Theft System Light on 2004 Chevy Classic
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I know the vehicle was at a rental car outlet before i purchased it. I did not get any key fobs or remotes with it. I thought it did not look right with all the splicing under the dash. I have not seen any boxes or anything else that does not look like it belongs.
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Hammer Time
Ultimate Carjunky
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Oct 13, 2012, 5:12 PM
Post #8 of 10
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Re: Theft System Light on 2004 Chevy Classic
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Something is supplying the password to the PCM or it wouldn't run and if it's not the ignition switch, something else is.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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aglantz
Novice
Oct 13, 2012, 5:13 PM
Post #9 of 10
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Re: Theft System Light on 2004 Chevy Classic
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Any ideas what I should look for or do I just let it be?
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Hammer Time
Ultimate Carjunky
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Oct 13, 2012, 6:35 PM
Post #10 of 10
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Re: Theft System Light on 2004 Chevy Classic
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You're going to need a professional scan tool to look at the BCM and the Passlock data and status.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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