DTC B109E 87: Communication Error With Start Stop Unit: Notes
WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC B109E:87 (REAR BODY CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSES
| Description |
Communication error with start stop unit |
| Detection condition |
- Rear body control module (RBCM) detects a communication error with the start stop unit for 10 times continuously
.
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| Fail-safe function |
Not applicable |
| 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
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 Courtesy of MAZDA MOTORS CORP.
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