Here is the wiring information for the head unit. This unit was commonly found in the Volkswagen Golf Mk5, Jetta, Passat, and Touran (mid-2000s).
The RCD 200 uses the Quadlock connector (large 20-pin block). Below is the pinout for the main block. Quadlock Connector Pinout (Block A) | Pin | Color (Typical) | Function | Notes | | :--- | :--- | :--- | :--- | | A1 | Red/Yellow | +12V Constant (Battery) | Memory for radio presets & clock | | A2 | - | Not used | | | A3 | - | Not used | | | A4 | Brown/Red | Illumination (+12V with lights on) | Dims the screen/buttons | | A5 | Brown/Yellow | Telephone Mute | Mutes audio when phone rings | | A6 | - | Not used | | | A7 | - | Not used | | | A8 | - | Not used | | | A9 | - | Not used | | | A10 | - | Not used | | | A11 | - | Not used | | | A12 | - | Not used | | | A13 | - | Not used | | | A14 | - | Not used | | | A15 | Black/Blue | GALA (Speed-dependent volume) | Signal from instrument cluster | | A16 | Red/Black | +12V Switched (Ignition) | Turns unit on/off with key | | A17 | Brown | Ground (Chassis) | Negative battery connection | | A18 | - | Not used | | | A19 | - | Not used | | | A20 | - | Not used | | Speaker Connector Pinout (Block B) This is the smaller 8-pin block (usually black or brown). Vw Rcd 200 Wiring Diagram