DTC B109E-87: Communication Error With Start Stop Unit (BCM): Notes
WARNING: This page is about a different car, the 2020 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
DTC B109E:87 (BCM) DETECTION CONDITION AND POSSIBLE CAUSE
| Description |
Communication error with start stop unit |
| Detection condition |
- BCM detects a communication error with the start stop unit for 10 times continuously with the ignition switched ON (engine off or on).
|
| Fail-safe |
Not applicable |
| Possible cause |
- Start stop unit connector or terminal malfunction
- BCM connector or terminal malfunction
- Short to ground in wiring harness between start stop unit terminal 1Q and BCM terminal 2J
- Open circuit in wiring harness between start stop unit terminal 1Q and BCM terminal 2J
- Start stop unit malfunction
- BCM malfunction
|
 Courtesy of MAZDA MOTORS CORP.
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