With blind spot monitoring (BSM) system

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

Possible cause

Connector terminal disconnection, poor contact, damage, deformation, corrosion
Open circuit in wiring harness between connector C-34 and C-08
Open circuit in wiring harness between connector C-08 and rear body control module (RBCM)
Connector C-34 malfunction
Connector C-08 malfunction
CAN circuit in rear body control module (RBCM) malfunction

System wiring diagram

Fig 1: Rear Body Control Module System Diagram

Courtesy of MAZDA MOTORS CORP.

Inspection item

Connector C-34
Connector C-08
Rear body control module (RBCM) connector
Wiring harness between connector C-34 and connector C-08
Wiring harness between rear body control module (RBCM) terminal 3E and connectors C-08
Wiring harness between rear body control module (RBCM) terminal 3G and connectors C-08
Rear body control module (RBCM)
- Between rear body control module (RBCM) terminal 3E and rear body control module (RBCM) terminal 4I
- Between rear body control module (RBCM) terminal 3G and rear body control module (RBCM) terminal 4L