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CMU Installation Note

WARNING: This page is about a different car, the 2017 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.
  1. To prevent an open circuit in the wiring harness, insert your hand from the front center speaker installation hole so that the parts being installed do not catch the wiring harness.
Fig 1: Front Center Speaker Installation Hole, Wiring Harness, Dashboard And CMU
G11431008Courtesy of MAZDA MOTORS CORP.