On my key card the little LED was flashing when I couldn't unlock the doors & trunk. At Mazda they called the part an antenna/sensor. It was located in the rear bumper. I was told that water had damaged it, which sounded right considering when it happened it was constantly raining. IIRC there are also sensors in the front doors.
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Boosted Big Body On 335's
PS3 ID: Rotordad
1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect.
2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect.
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