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Transponder 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=6131
Printed Date: June 11, 2024 at 6:40 AM


Topic: Transponder bypass

Posted By: jrilla
Subject: Transponder bypass
Date Posted: December 02, 2002 at 9:02 AM

Has anyone actually bypassed a PATS using a relay and wrapping a wire aroung the transponder and around the key cylinder, and found it as easy and reliable as the bypass kits?  I have never tried it this way since the bypass kit is so easy to install, but I have considered trying the relay method for those customers who are so cheap they dont  want to spend the additional money. If I think about it though, the extra labor and headache would cost more than the money they would save.



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J Rilla

Owner/Installer



Replies:

Posted By: Velocity Motors
Date Posted: December 02, 2002 at 9:20 AM

I do this with all the newer systems ( eg. Infinity G35's, new Ford's , most imports ) because they all are going to those new Immobilizer's that change the code of the key everytime the driver takes the key out of the key cylinder. I have done this for the past couple of years where there is no available keyless bypass for the vehicle. What you may want to do is use a scroll saw to cut the key portion off of the key and give this back to the customer to assure them that even if the car is broken into and the thief finds the bypass relay, they can not steal the car because the key portion is gone.

It's funny that you say that it take more time to do it with the relay, I find it takes more time to attach 6 or 7 wires for some bypass kits than it does to attach the 4 on this relay. My 2 c's



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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA




Posted By: mobileinstallat
Date Posted: December 02, 2002 at 9:20 AM

I have done many of them but I make them up a few at a time before hand. make the loop a 3 turn and keep the transponder between 8-10 inches from the key cyl. also dont run the wire next to any metal. be shore to glue/silicone the capsule in the ten turn wire wrap- IT MUST NOT MOVE. slide it to both extreems then glue it at the mid point. also keep the made loop away from the metel of the key cylinder, glue that to then tape it! the lerning curve, IMHO is worth it but, I charge them for a module anyway! time is money. I started making these things in 87 when the price of the mod was double what it is now- it made sence back then. now the module price isnt such a turn off to the customer. If hes that cheep kick him out! LOL

Mark





Posted By: jrilla
Date Posted: December 02, 2002 at 9:39 AM

I think I will stick to my $15 bypass module that I only have to hook up 2 wires, +12v and a ground that is triggered by the starter unit during remote start.  All I have to do is stick the key inside a little box and place the prewired coil around the key cylinder and I'm done. 

Jeff, I am not sure which bypass kit you are referring to that requires 6 or 7 wires.  Is there a keyless bypass module that you use?  Also, can you tell me more information on the new type of immobilizers you referred to that change the code every time the key is removed.  How does that work, I mean if the code changes, then the next time the key was inserted the ignition would require that new code, but what if you inserted the other key, wouldn't it be different? I know my confusion is due to my lack of depth of knowlegde about these type of immobilizers, so bear with me.

Thanks



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J Rilla

Owner/Installer




Posted By: Velocity Motors
Date Posted: December 02, 2002 at 10:14 AM
There are a couple of bypass units that I use for various car manufacturer's that require a total of 6 or 7 wires to be hooked up ( switched ignition, constant, ground, data wire, second ignition wire, etc ). Maybe I should have gone into more detail about the Immobilizer's. From what I understand the ECM controls the code that is emiited via RF to the chip in the key and it is communicated back and forth when the key is inserted into the cylinder. With some of the Immobilizer's ( NOT ALL ) there are two codes that is transfered. One is the actual code and the other is a fake code that changes as you use it to protect the actual transponder code from being copied. BMW and Mercedes both use this type of system and some other Eurpean companies are jumping onto this band wagon as well. This type of transponder is called a rolling code system or encrypted immobilizer system.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA





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