With memory power seat

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
Electric parking brake control module power supply voltage or body ground malfunction
Open circuit in wiring harness between electric parking brake control module and connectors C-54, C-55
Connectors C-54, C-55 malfunction
Electric parking brake control module malfunction

System wiring diagram

Fig 1: PCM System Diagram (K - With Memory Power Seat)

Courtesy of MAZDA MOTORS CORP.

Inspection item

Electric parking brake control module power supply voltage-related wiring harness and fuse
Electric parking brake control module body ground related wiring harness
Electric parking brake control module connector
Connectors C-54, C-55
Wiring harness between electric parking brake control module terminal 2G and connector C-54
Wiring harness between electric parking brake control module terminal 2F and connector C-55
Electric parking brake control module