DTC B109E-87: Communication Error With Start Stop Unit: Notes

WARNING: This page is about a different car, the 2013 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with start stop unit
Detection condition	Rear body control module (RBCM) detects communication error with start stop unit for 10 times continuously .
Fail-safe	-
Possible cause	Start stop unit connector or terminal malfunction Rear body control module (RBCM) connector or terminal malfunction Short to ground in wiring harness between rear body control module (RBCM) terminal 3B and start stop unit terminal 1Q Open circuit in wiring harness between rear body control module (RBCM) terminal 3B and start stop unit terminal 1Q Start stop unit malfunction Rear body control module (RBCM) malfunction