12 pin Head Unit proprietary connector

This is proprietary (non-standard, product specific ) connector. A proprietary connector is the special connector that can only be used with a certain device(s).

This is the 12 pin Head Unit proprietary connector

12 pin Head Unit proprietary connector view and layout

The pinouts for the 12 pin Head Unit proprietary connector are:

Clarion PT-8126U pinout
Clarion PT-9672L pinout
Panasonic RDS CA01 66 9C0A, CQ-XM8951A (MAZDA) pinout
Pioneer KEH-7150 pinout