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GM Passlock2 ignition bypass

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=53080
Printed Date: July 13, 2025 at 5:15 AM


Topic: GM Passlock2 ignition bypass

Posted By: Verto
Subject: GM Passlock2 ignition bypass
Date Posted: April 02, 2005 at 6:11 PM

ok... heres the scoop on my load of poop :D

i got a Code-Alarm system for my truck, im in the process of installing but having problems with remote start and passlock2 bypass... the truck is a 2000 chevy s-10 blazer and im using a Code-Alarm CSI 400 unit...

i bought a universal passlock bypass unit today for it hooked up but problems persist... it starts with the key like it should, but when i go to remote start it starts then dies cus the passlock isnt being bypassed or something... then when i go to start with the key again it does the same :(

so i unplug the main ignition harness and wiggle the wires and stuff to check connections (seems to be the brown keycheck wires is always loose) then hook it back up then it works...

i repeat the process of trying to remote start but it stuff gets messed up posted_image sooo i need some suggestions...

plz help me all u genius people :D thanks



Replies:

Posted By: mo12v
Date Posted: April 02, 2005 at 6:39 PM

https://www.wiringinstructions.com/238.htm

<< (seems to be the brown keycheck wires is always loose)  >>?????

Not sure what wire you are talking about

PASS 2 Units can be Hard wired or DATABus Units...........
Which do you have??  Have U checked to see if your PASS 2 Unit is wired correctly?



-------------
MO

Don't Learn from Others Mistakes
You Might Be the One That Knows.




Posted By: Verto
Date Posted: April 02, 2005 at 6:58 PM
my unit is hard wired cus it was all i could find... the pass2 unit itself should be fine cus i havent messed with it any just splicing in stuff

my wiring looks kinda like that diagram cept im not usin the relays cus i got 1 seperate units and all...

1 more question tho... the 1amp diode on that diagram... do i need that? or wuts does it do? ect...

thanks for ur help too posted_image




Posted By: Verto
Date Posted: April 02, 2005 at 7:02 PM
oh ya 1 more thing... my bypass module is made by designtech their site




Posted By: Verto
Date Posted: April 02, 2005 at 7:17 PM
my bypass unit


the exact link... not that its much help posted_image





Posted By: Satkunas
Date Posted: April 04, 2005 at 2:13 PM
What happens when you start the vehicle with the key, and then do a takeover with the remote starter? Does the vehicle die right away, or does it continue to run and does the security light illuminates on the cluster?




Posted By: Verto
Date Posted: April 04, 2005 at 5:40 PM
if i try to start with the key it starts then the BCM kills it... then i try to start with the key and it wont start... then pull the fuse for the BCM try to start with key then replace fuse and it works with key... think my bypass unit isnt set rite or something... i just ordered the autosensing Bulldog Security unit... hopefully i can get it to work :)




Posted By: tcr03
Date Posted: April 04, 2005 at 5:54 PM
stop buying junk. just get the dei 555L




Posted By: Satkunas
Date Posted: April 04, 2005 at 6:09 PM
Let the vehicle sit for 15 minutes. Then start it with the key. Once it's running then do a take over with the remote starter and remove the key. Does the security light come on?

Verto] wrote:

t starts with the key like it should

Verto] wrote:

if i try to start with the key it starts then the BCM kills it

Verto] wrote:

hen i try to start with the key and it wont start


Which is it?




Posted By: Verto
Date Posted: April 04, 2005 at 7:37 PM
all of them posted_image

when i start with remote start it starts then dies cus of the anti-theft system

then i start with key and it dies cus the anti-theft system is still not reset

then i reset it and i can start with the key again

but if i remote start itll get screwed again




Posted By: Satkunas
Date Posted: April 04, 2005 at 7:57 PM
Hence why I asked you to let the vehicle sit for 15 minutes. I assumed from your first post that you were trying to start the vehicle with the key too soon after the vehicle refused to start with the remote starter.

This is why I asked you to do a take over with the remote starter after you started it with the key. If the security light comes on but the vehicle continues to run then I can assure you that the problem is with the Rcode value being given to the passlock system. If the vehicle stalls then I can tell you that the problem is with the remote starter and probably has nothing to do with the passlock bypasskit. If the vehicle runs and the light stays out the the problem could be that the bypasskit is hooked up as a Passlock I (bulb test used, no rcode during crank) when in fact it should be hooked up as a Passlock II.

I can only speculate, and cannot tell you with any certainty what is wrong unless you do some additional testing. By doing a RS takeover we can cut the possibility of problems in half which is an excellent start on trying to find out what is going on. It's easy for someone to say that a product is crap and automatically mention that you should go and buy something else, but in 99% of the calls I take across north america, installation error is the problem with a huge majority of them, and by this I don't blame the installer, sometimes the installation documentation is quite weak itself which leads to most fo these errors.

We just need to find out where you went wrong.




Posted By: Verto
Date Posted: April 04, 2005 at 8:10 PM
erm well... will that work with the bypass kit off? cus i just took it off cus i got a new 1 coming... i guessed that the rcode value wasnt set rite so i ordered an autolearning unit... my digital voltmeter wouldnt pick anything up but my analog 1 did, but needed to be calibrated rite... so i figured autolearning unit would be worth saving the time and effort




Posted By: Verto
Date Posted: April 04, 2005 at 8:15 PM
hehe im understandin ya posted_image




Posted By: Verto
Date Posted: April 08, 2005 at 7:10 PM
w00t! i got my bypass unit... but still no luck posted_image

can some1 help me?

heres my wires-

remote unit - car
orange accessory - orange at steering column
pink ign1 - pink ignition wire at steering column
purple - yellow starter at steering column
pink/white - white ign2 at steering column
active output - bypass unit

bypass unit - car / remote unit
yellow - yellow passlock wire
orange - ORANGE / black passlock wire
blue - active output
white - pink ign1 at steering column
yellow/black - starter at steering column

now i did this... and it wouldnt start... i also tried to put the key in and turn it to run and then remote start but it died... then i tried a takeover with the key in then remote start and the bypass unit hooked up but it died too... my bypass unit is the bulldog 791 auto sensing unit and i have a CSI400 remote unit




Posted By: floaterr
Date Posted: April 09, 2005 at 12:29 AM
1st off
The bulldog unit is BS (or it just me being tired). The FIRST problem in the word directions tell you all this crap about how to install PASSLOCK II (you have II) connecting the white wire to the blue wire on the unit blah blah blah. SO CONFUSING. The pictures shows no connection to white wire. SEE HERE

2nd off
There is no where in the instructions on cutting the YELLOW wire. Maybe I just haven't seen this brand but the ones I have done and seen you have to CUT the yellow wire. I mean right off the bat if you DON'T cut the wire then when the bypass tries to activate it's going to ADD it's resistor to the ckt instead of switching the ckt off the ign and to the bypass. I mean I guess it could just attach to the ckt but it doesn't seem right

Here's the normal connections for PASSLOCK II

Even the DEI 555L cuts the YELLOW wire and it too is learning.


ALSO. YOU NEVER answered and above question......
There is NO BROWN wire (bulb check) on PASSLOCK II. If your connecting to some brown wire then it too might be causing the issue.

Also,
If you couldn't get a resistance value with your digital meter then you must being doing something wrong. I only own a digital and have used it countless times.



If you haven't already fixed this double check how your getting the resistance value (remember the key sometimes has to go all the way to crank) and either get the 555dl, wire it manually or find one a bypasskit.com.




Posted By: Verto
Date Posted: April 09, 2005 at 8:47 PM
heh... got it to work today posted_image

had the starter hooked up rite just missing the bypass unit... didnt have it hooked to the rite ignition wires... brown wire was accessory2 didnt have it hooked to the bypass unit to its irrevelent

the bulldog unit worked perfectly posted_image and no it dont require u to cut the yellow wire just splice it in... no when the key is not turned on it there is no resistance cus it isnt a closed circuit...

and in the instructions it says the bulb check light is only for passlock1... i found the instructions easy to follow once i READ them... lol! was lookin at the diagram b4... so its all good now. posted_image

P.S. I RECCOMEND THE BULLDOG 791 BYPASS UNIT!




Posted By: floaterr
Date Posted: April 09, 2005 at 10:49 PM
Sweet.

Glad it was something simple like that.




Posted By: Verto
Date Posted: April 17, 2005 at 3:57 PM
thanks for ur help posted_image

i enjoy scaring people by starting it when they walk by my car... its quite entertaining...

been a couple weeks of use and all is holding up posted_image hehe

now for my other truck... has passlock1 on it gonna be a pain in the ass too...





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