Mazda CX-5 2017–2019 — technical service bulletin
Bulletin 09-032-19-3579 · NHTSA communication 10164045 · issued Aug 16, 2019
Technical service bulletin
communication type
Back Over Prevention
component
2017–2019
model years
3
vehicle entries
Official summary
Some customers may experience improper operation of the rear parking system with beep sounds coming from the rear parking sensor when there are no obstacles behind the vehicle. This occurs when the blower fan is on (at any fan speed) and the transmission is in "R" position. The concern is caused by electrical noise from the blower fan controller circuit affecting the rear parking sensor circuit. To eliminate this concern, the harness to the rear parking sensor has been twisted to improve its tolerance to electrical noise.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.