DTC B1518-14: Backup Power Supply Circuit Malfunction (BCM): Outline
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1518:14 (BCM) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Backup power supply circuit malfunction |
| Detection condition |
- The electrical supply unit (ESU) detects an open circuit or short to ground in the backup power supply circuit.
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| Fail-safe |
Not applicable |
| Possible cause |
- Backup power supply connector or terminal malfunction
- Electrical supply unit (ESU) connector or terminal malfunction
- Open circuit in backup power supply circuit
- Short to ground in backup power supply circuit
- Backup power supply malfunction
- Electrical supply unit (ESU) malfunction
- Body control module (BCM) malfunction
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 Courtesy of MAZDA MOTORS CORP.
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