From Ross-Tech Wiki
00857 - CD Changer Unit (R41)
00857 - CD Changer Unit (R41): No Signal/Communication
- CD Changer Unit (R41) not working
- Wiring/Connectors from/to CD Changer Unit (R41) faulty
- CD Changer Unit (R41) not connected
- Control Module Coding incorrect
- Check Wiring/Connectors from/to CD Changer Unit (R41)
- Check Control Module Coding
- Some factory installed Features like iPod interfaces use the same CD-Changer input on the radio.
- 3rd party or non-standard units which connect to the CD changer interface may cause such fault codes, so unless you are experiencing real problems just ignore this code.
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