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U0184 U0xxx · 网络通信（U） 低严重度
Lost Communication with Radio / Infotainment Module
The head unit has dropped off the bus. Rarely affects driving, but on fibre-optic (MOST) systems one dead node can silence the whole ring.
严重程度说明： 低——通常不影响行驶，下次保养时处理即可
你会注意到的故障现象
- No audio or dead screen
- All speakers silent
- Steering-wheel controls dead
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Head unit power fault
- 2 MOST fibre ring broken at one node
- 3 CAN fault
- 4 Aftermarket audio interface
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ On fibre systems, check whether other ring nodes work — one break kills the whole ring.
- ✓ Check fuses and the head unit connector.
- ✓ Look for aftermarket interfaces teed into the bus.
- ✓ Bypass each node if the vehicle supports a ring test.
维修方案
- Restore power or repair the wiring
- Replace the failed node
- Remove or correctly interface aftermarket audio
U0184 —— 常见问题
Why is everything silent, not just one speaker? +
MOST fibre is a ring. Any break takes down every node on it.
Is it worth fixing? +
Depends on the vehicle. On fibre systems it also affects navigation, phone and sometimes vehicle settings.