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April 23, 2020 Service bulletin

Some customers may experience that the door locks may not operate using the touch sensor on the outer door...

Mazda technical service bulletin 09-017-20-3701 for 2019-2020 Mazda MAZDA3 and 2020 Mazda CX-30.

Bulletin number
09-017-20-3701
Component
Electrical system
Summary
Some customers may experience that the door locks may not operate using the touch sensor on the outer door handle while parked in a parking space surrounded by concrete walls, but will operate when using the remote transmitter. This concern may be caused by refraction and/or diffraction of the signal used for the advanced keyless entry system by the steel reinforcement bars in the concrete walls. As a result, the signal will resemble a theft attempt (known as a Relay Attack) and the anti-theft function of the advanced keyless entry system will prohibit door lock operation. To eliminate this concern, the LF control unit software has been modified to reduce the improper detection of the theft attempt.

Owners of these vehicles have filed 19 complaints in the electrical category.

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