DTC U3003:16 [Front Body Control Module (FBCM)]: Notes
WARNING: This page is about a different car, the 2024 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.
DTC U3003:16 (FRONT BODY CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE
| Description |
Front body control module (FBCM) power supply voltage (B+ power supply) low input |
| Detection condition |
- Front body control module (FBCM) power supply circuit voltage of 8.8 V or less is detected for 10s or more with the ignition switched ON (engine off or on).
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| Fail-safe |
Not applicable |
| Possible cause |
- DTCs are stored in the PCM.
- Battery malfunction
- Generator malfunction
- Front body control module (FBCM) connector or terminal malfunction
- Front body control module (FBCM) power supply circuit malfunction
- Short to ground in the wiring harness between the following:
- MAIN 200 A fuse-Front body control module (FBCM) terminal 2A
- MAIN 200 A fuse-Front body control module (FBCM) terminal 1A
- MAIN 200 A fuse-Front body control module (FBCM) terminal 1B
- MAIN 200 A fuse-Front body control module (FBCM) terminal 3K
- MAIN 200 A fuse-Front body control module (FBCM) terminal 3L
- INTERIOR1 15 A fuse malfunction
- ROOM 25 A fuse malfunction
- HAZARD 25 A fuse malfunction
- Open circuit in wiring harness between the following terminals:
- Battery positive terminal-Front body control module (FBCM) terminal 2A
- Battery positive terminal-Front body control module (FBCM) terminal 1A
- Battery positive terminal-Front body control module (FBCM) terminal 1B
- Battery positive terminal-Front body control module (FBCM) terminal 3K
- Battery positive terminal-Front body control module (FBCM) terminal 3L
- Front body control module (FBCM) malfunction
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 Courtesy of MAZDA MOTORS CORP.
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