Miscellaneous (C)
The connector C is optional. Some times, it appears as one 20-pin connector, often red in colour, or it may be divided into three separate connectors which may be hooked together, in which case C1 is usually yellow, C2 is usually green which C3 is usually blue in colour. The contact spacing is narrower than the other connectors, so the C connector is sometimes referred to as mini-ISO.
| 1) line out left rear | 4) line out left front | |||
| 3) line out common ground | 6) +12V switched (out) | |||
| 2) line out right rear | 5) line out right front | |||
| 7) receive data | 10) +12V switched (out) | |||
| 9) chassis ground | 12) remote control ground | |||
| 8) transmit data | 11) remote control in | |||
| 13) data in (bus) | 16) +12v switched (out) | 19) audio left | |||
| 15) +12v permanent (out) | 18) audio ground | ||||
| 14) data out | 17) data ground | 20) audio right | |||
Note: ISO 10487 only defines the physical attributes of the connectors, not the pin/signal designations, which are manufacturer-defined. The example above is oriented towards VW vehicles only.
Read more about this topic: Connectors For Car Audio, ISO 10487
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