Why would my car not recognize my fobs?


Asked by May 16, 2016 at 03:24 PM about the 2014 Mazda CX-9 Grand Touring AWD

Question type: Maintenance & Repair

My blind spot monitor stopped working about a
month ago.  Now my car doesn't recognize either
of my remotes....that issue got progressively
worse until now they don't work at all.

1 Answer


Unfortunately you need to take it to the dealer. The battery in the key fob could be going bad or maybe if you dropped it also. If it's not responding the only way to fix that is by having the dealer use a manufacturer scan tool to rewrite the ids to the theft deterrent module. The blind side module probably is a seperate issue. Although with out a full description and operation of the theft deterrent system it's hard to tell. The blind side module may some how communicate with the the theft deterrent module. But that's something only the dealer would be able to determine. All these new cars have about 20 to 30 modules that communicate with each other and with a factory scan tool it's impossible to tell. You could have 5 trouble codes in your blindside module and it won't turn your check engine light on because the codes that turn your check engine light on have to do with emissions and things that could damage your converters. I recently had a Mazda with the Bsm light flashing... Blindside module... And the issue was one of the sensors in the rear bumper was disconnected. Any kind of back up camera or rear view camera used sensors on the rear bumper and front bumper to alert you of a close object. So if you were in an accident even if someone just bumped one of those sensors it could very possibly damage that module. Once again the dealer would be able to use the manufacturer scan tool to pull codes for that module. Hope this helps but it needs to go to the dealer to solve this issues so don't go to a local shop bc the will just through parts at it and it's a 2014 so it would be under warranty

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