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Help! Passlock problem


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phaseshift99 
Member - Posts: 4
Member spacespace
Joined: October 30, 2002
Location: Canada
Posted: October 30, 2002 at 1:56 PM / IP Logged  

I have a 1994 Pontiac Grand Prix which has passlock (resistor pellet in the key) which is causing headaches for me. I have a remote starter installed, and I'm not sure how the passlock is bypassed.

The previous owner told me that in the winter I would have a problem where sometimes the car would not start and I would have to wait 3 mins to retry. He could not find the problem. I have figured out that it is because of the passlock system. The colder weather and moisture is messing up the resistance somewhere. My question is where to look? Could this be because of the remote starter install? What else would cause this problem, and where can I find a wiring diagram of the ignition wiring? Can I stick a resistor somewhere that is the same value as the key to get rid of this? Thanks!

chuntag95 
Member - Posts: 39
Member spacespace
Joined: October 24, 2002
Location: United States
Posted: October 30, 2002 at 2:12 PM / IP Logged  
Look up the car here in the vehicle section to get the wire colors.  The steering columb is the most likely area for the bypass.  The passlock defeat is probably drifting the resistance with temperature, i.e. it was installed in the summer and when the temp changes, it is too far out.  If it was defeated with a resistor, you can check connections for corrosion which would increase resistance.  The other possibility is it was done with a Pot and it is drifting.  There are some very informative sections in the car security section on this site that would help you understand what you are trying to do.   There are several modules you can get to perform this function.  Some are completely automatic and others you have to measure the resistance and dial it in or get a resistor yourself.
Chris
Velocity Motors 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: October 30, 2002 at 3:10 PM / IP Logged  
Go to this link for complete details on how to bypass the VATS key: https://www.the12volt.com/downloads/file.asp?ID=237
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
phaseshift99 
Member - Posts: 4
Member spacespace
Joined: October 30, 2002
Location: Canada
Posted: October 31, 2002 at 8:01 AM / IP Logged  

Great! Thanks guys! I think I should be able to figure this out now.

One more question though, this affects starting the car with the key or the remote starter, if I do have a drifting resistor or variable resistor does this sound right? What I mean is having the bypass inline with the key would it affect regular operation without the remote starter?

I love this forum already, nobody I've talked to around here has any idea what I'm talking about!

chuntag95 
Member - Posts: 39
Member spacespace
Joined: October 24, 2002
Location: United States
Posted: October 31, 2002 at 8:17 AM / IP Logged  

If it's set up correctly, the bypass is only active for the remote start.  The key functions normally when the remote start is not activated by the alarm and should not be affected by the temperature (assuming GM's key is good).  When the relay is not engaged by the alarm, the key works as it did originally. 

Hope this answers your question.

Chris
phaseshift99 
Member - Posts: 4
Member spacespace
Joined: October 30, 2002
Location: Canada
Posted: October 31, 2002 at 10:47 AM / IP Logged  

Hmmmm, I think the relay is probably the problem. I took a look at it, and it is set up just like the link. I believe they used the spare key as the resistor (I was wondering why I only had 1 key!!), and the install looks good.

I am going to try taking the relay out of it (wire the vats line straight) and see if the problem goes away (with regular key starting, I know the remote start won't work anymore). The relay could be affecting the resistance shown when cold (I noticed the relay was made by ford, LOL!) which would explain why it won't start with the key or starter. It could also be the wiring, but that looks good, and I've ruled out the wiring going to the ignition switch because if that was bad it should still start with the remote (right guys?). So hopefully I won't see the problem with the relay out, and when I am confident that this is the problem I can go buy another relay. If not, I'm lost, has anybody seen the VATS module go bad?

Velocity Motors 
Moderator - Posts: 12,488
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: October 31, 2002 at 7:11 PM / IP Logged  
How many prongs does the relay have that you think is damaged ? It should have 5 prongs on it. Just make sure that you are using a 5 prong and not a 4 prong for the above diagram.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
phaseshift99 
Member - Posts: 4
Member spacespace
Joined: October 30, 2002
Location: Canada
Posted: November 01, 2002 at 7:22 AM / IP Logged  
The relay does 5 prongs, I'm pretty sure this is the problem.

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