Infinity transponder problem

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=44694
Printed Date: May 01, 2025 at 2:36 PM

Topic: Infinity transponder problem

Posted By: riceman
Subject: Infinity transponder problem
Date Posted: December 08, 2004 at 1:39 AM

I just did a 03' Infinity g35 sedan with viper 791xv. I used 556u for the transponder by-pass. and had the RS set to voltage sense and everything worked fine for about a week then the car came back. The customer was saying that the car cranks but dosn"t start . So I tried to dianosis the problem for four hours still with no luck. I figured it was a transponder problem i had replaced the 556u and still no luck. By this time the customer had to go and he came back the next day to fix the problem. I thought that it was a transponder problem so i played around with ring placement for anothor few hours now i have practially pulled out all of my hair,I confirmed it was a transponder problem by hitting the RS n at the same time as it starts i turn the key n then back off. The RS then stayed on so i knew eveything was alright n it was a transponder problem. I finallly almost gave up when i took the key out of the 556u then tried to start it to clear the extra gas in the car from the repeated non starts . To my suprise the key dosnt start the car anymore. First thought o....... S#$ts the car is in protection then i grab the other key n it started the car. It was the most beatiful sound, it started. Now everything works fine. MY problem is In my five yrs of experience i have never seen a dealer key loose memory the key orginally started the car. I always make sure the key starts the car before i put it in the box.This was one of my worst days installing. Has this every happened to anyone before and most of all how does it happen? thanks

Replies:

Posted By: IMAGE6902
Date Posted: December 08, 2004 at 11:38 PM

i don't know if this helps, but here goes... did one in an 04 mini cooper and the transponder key has the keyless entry built into the head of the key. I took the key apart and put the transponder portion in the 555u and installed like normal. tried to start and failed. put key in lock tried to start and worked! put back in bypass and didn't work. swapped bypass and antenna ring and still no luck. took transponder out of key, put in bypass and still didn't work. what was happening was the coil of wire in the bypass was too loose around the key cause it's one size fits all. this car also had a weak transponder it seemed but what i had to do was make a bypass out of a coil of wire and wrap it around the transponder tight. that way the signal transfer to the factory antenna ring was stronger. hope everything worked out with yours! take it easy

-------------
I tell it like it is...

Posted By: riceman
Date Posted: December 09, 2004 at 1:15 AM

Image6902 everything worked out fine the orginal key that was in the box didnt even start the car anymore. Don't know how that happened but it did. The other master key when put into the box works fine. You know it was just one of those days. The customer is understanding n told me he had a valet key that he can bring me. I was just wondering how a manafacture key stops working. Those keys are suppose to work the life of the car. I just want to hear everyones experience if any on this so if its something like sticking the key next to a sub or something that erases a key I would like to know. Thanks for your input.