DTC B1C84 12: Rear Window Defroster Relay Circuit Malfunction: 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 B1C84:12 (FRONT BODY CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSES
| Description |
Rear window defroster relay circuit malfunction |
| Detection condition |
- Front body control module (FBCM) detects a short to power supply in the rear window defroster relay circuit with the ignition switched ON (engine off or on).
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| Fail-safe function |
Not applicable |
| Possible cause |
- Rear window defroster relay malfunction
- Front body control module (FBCM) connector or terminal malfunction
- Short to power supply in wiring harness between rear window defroster relay terminal E and front body control module (FBCM) terminal 1P
- Front body control module (FBCM) malfunction
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 Courtesy of MAZDA MOTORS CORP.
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