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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 (2474 views)
Theft System Light on 2004 Chevy Classic Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 13, 2012, 4:52 PM

Post #2 of 10 (2471 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

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)


aglantz
Novice

Oct 13, 2012, 4:56 PM

Post #3 of 10 (2455 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 13, 2012, 4:59 PM

Post #4 of 10 (2449 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

The PCM won't supply injector pulse unless it receives the correct password from the BCM so something is definitely wrong with this scenario.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



aglantz
Novice

Oct 13, 2012, 5:01 PM

Post #5 of 10 (2442 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 13, 2012, 5:05 PM

Post #6 of 10 (2436 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



aglantz
Novice

Oct 13, 2012, 5:09 PM

Post #7 of 10 (2426 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 13, 2012, 5:12 PM

Post #8 of 10 (2422 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

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.



aglantz
Novice

Oct 13, 2012, 5:13 PM

Post #9 of 10 (2418 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

Any ideas what I should look for or do I just let it be?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 13, 2012, 6:35 PM

Post #10 of 10 (2397 views)
Re: Theft System Light on 2004 Chevy Classic Sign In

You're going to need a professional scan tool to look at the BCM and the Passlock data and status.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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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