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Passlock Resistance Question

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=13207
Printed Date: August 21, 2025 at 3:10 PM


Topic: Passlock Resistance Question

Posted By: arostad
Subject: Passlock Resistance Question
Date Posted: May 05, 2003 at 8:13 PM

Ok all I have been a installer for almost a year now and I have installed a fair amount of remote starters. At my place of work we use DEI 555L's to bypass passlock so I'm not real familiar with using a resistor and a relay to bypass passlock II. Here is my dilemma.... I measured the resistance of a few trucks that I will be doing remote starters in this coming week. Here is what I got

First truck 2.470k
Second truck 1.325k
Third truck 2.475k
Forth truck 2.472k

I attained these #'s by starting the truck and then I cut the yellow wire and put my red probe on the key side of the wire I cut and then I put my black probe on the striped area of the ORANGE / black wire. I did this twice for each vehicle and got close to the same resistances each time. I'm going to use this relay setup to bypass passlock temporally with the resistors that I make to match the above resistances.

My question is.... do these resistances look correct to the people that bypass passlock like this all the time? I just want to be sure I'm doing this the right way so I don't have to do it over. Please help me out if you can because it would be greatly appreciated.



Replies:

Posted By: JWorm
Date Posted: May 05, 2003 at 10:05 PM
Why do you want to use a relay? Its not always perfectly reliable.   The resistance will vary with the vehicle. It will also vary with temperature. The 555L relearns the resistance everytime the vehicle is started.




Posted By: arostad
Date Posted: May 05, 2003 at 10:36 PM
Well since there is a %5 tolerance I think that the relay will work just fine + i don't want to have to shell out 25 bones for each 555L.





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