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Hi, My Mazda 3 2004 has an issue, my key fob has not been responding i have changed the battery in the key fob and checked the fuses in the car. I can lock and unlock the car manually with the key however when i do so the hazard lights do not flash as they normally would. What do I do, please help asap.

Thank you,
 

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Demon Spawn
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sounds like the "brain" of the alarm system has died, usually its cheaper to go after market and have them wire in a new keyless system then it is to go to the dealer and get the parts to fix the factory module.
 

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You haven’t ruled out a failed fob. I’d get a new fob and try to repair both fobs to the vehicle before I’d blame the car receiver. Pairing fobs is easy but weird; it involves twitching the key in the ignition and opening/closing the car door to get it into pairing mode. Specific instructions are elsewhere online.
 
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