keyless fob frequency
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=108116
Printed Date: May 18, 2024 at 9:09 AM
Topic: keyless fob frequency
Posted By: rwdbmwm3
Subject: keyless fob frequency
Date Posted: October 12, 2008 at 7:17 PM
I was wondering if anyone knows the frequency that is used by the keyless Fobs ...
I work quite a bit with problems with either the car or keyfob, id like to create a frequency reader of somesort..
so if i press the keyfob, the light will light up on my detector... if it doesnt, i will know the keyfob is faulty
Replies:
Posted By: howie ll
Date Posted: October 13, 2008 at 6:31 AM
Usually between 413 and 433mhz, right there with maritime radar. Some years ago when Chrysler launched the Voyager in Europe ,they gave the keys to journalists at Dover Harbour with instructions to take the vehicles over to France and road test them. They didn't know that they were adjacent to the radar station controlling the English Channel, probably the most powerful civilian radar going, you know what happened next don't you.
Posted By: KPierson
Date Posted: October 13, 2008 at 12:29 PM
315mhz and 433mhz are the two most popular frequencies that I've seen used in automotive keyless systems.
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Kevin Pierson
Posted By: rwdbmwm3
Date Posted: October 15, 2008 at 9:45 AM
what would be the easiest way to construct a tester that would basically turn on a light once the frequency is read by the "reader"
i.e. i press remote and the little tester reads it (it works) and the led starts to turn on and off depending on freq.
Posted By: KPierson
Date Posted: October 15, 2008 at 10:58 AM
You would just need an antenna system hooked to a processor that could read in the values of the actual bit stream and calculate a frequency based on that. You wouldn't be able to actually read the data, but you could light up an LED if the recieved data appears to be within the range of the frequency you are looking at.
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Kevin Pierson
Posted By: howie ll
Date Posted: October 17, 2008 at 1:46 PM
Or hold an old fashioned landline telephone receiver close to the remote?
Posted By: rwdbmwm3
Date Posted: October 19, 2008 at 4:05 PM
howie ll wrote:
Or hold an old fashioned landline telephone receiver close to the remote?
this seems like th easiest way..how would this work?
Posted By: howie ll
Date Posted: October 19, 2008 at 4:31 PM
Pick up fixed landline phone, not cordless, definately not digital cordless, wait for dial tone then press remote. This used to work some years ago on analogue phones, haven't tried it for some years, don't know if it works on digital phones.
Posted By: dustimizer
Date Posted: October 19, 2008 at 10:02 PM
I have been looking into getting one of these https://www.mytoolsforyou.com/automotive-tools/BSL-500010.html
it is an IR and RF tester. This is the best deal that I can find it for, and it comes with 30 batteries. Sell the batteries=FREE tool.
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