Vw Rcd 310 Wiring Diagram Jun 2026

If the battery is disconnected, the unit may enter "SAFE" mode. EEPROM Access: Specialized tools like CarProTool

| Pin | Wire Color (Typical VW) | Function | Notes | | :--- | :--- | :--- | :--- | | | Yellow/Red | Switched 12V (Ignition) | Turns radio on/off with key. | | A2 | Black/Blue | Diagnostic (K-Line) | For VCDS/OBD scanning. | | A3 | - | Not Used | | | A4 | Grey/Black | Right Front Speaker (-) | | | A5 | Grey/White | Left Front Speaker (+) | | | A6 | Brown/Red | Phone Mute | Aftermarket hands-free. | | A7 | Red/Black | Constant 12V (Battery) | Retains memory and presets. | | A8 | Brown | Chassis Ground | Essential – check with multimeter. | | A9 | - | Not Used | | | A10 | Grey/White | Right Rear Speaker (-) | | | A11 | Grey/Yellow | Left Rear Speaker (+) | | | A12 | Blue/White | Speed Pulse (GALA) | For automatic volume adjustment. | | A13 | Grey/Red | Right Front Speaker (+) | | | A14 | Grey/Brown | Left Front Speaker (-) | | | A15 | Grey/Violet | Right Rear Speaker (+) | | | A16 | Grey/Green | Left Rear Speaker (-) | |

The Quadlock is usually divided into three distinct sections: Vw Rcd 310 Wiring Diagram

Ground (Black); Pin 15: 12V Constant (Yellow/Red); Pins 9 & 10: CAN-Bus High/Low Speakers Output to 4 speakers Pins 1-8: Front/Rear Positive and Negative AUX (Block 3) External audio input

If you are replacing the RCD 310 with a non-VW radio, you must use a CAN-Bus interface adapter . This converts the vehicle's digital data signals into the analog 12V "switched" power and illumination signals needed by aftermarket units. If the battery is disconnected, the unit may

| Pin Number | Wire Color (Typical) | Function | Description | | :--- | :--- | :--- | :--- | | | Yellow | Battery Plus (+12V) | Constant power source (Unswitched). Keeps radio memory alive. | | 15 | Brown | Ground (GND) | Chassis ground connection. Essential for safety and signal clarity. | | 14 | - | NC | Not Connected. | | 13 | - | NC | Not Connected. | | 12 | Orange/Brown | CAN-Bus Low | Data signal for wake-up/sleep commands. | | 11 | Orange/Green | CAN-Bus High | Data signal for wake-up/sleep commands. | | 10 | Blue/White | GALA | Speed-dependent volume control signal. | | 9 | - | NC | Not Connected. | | 8 | - | NC | Not Connected. |

That is an interesting post topic, because the sits in a unique spot: it’s a basic, non-touchscreen head unit, but upgrading or repairing it often requires understanding its two very different wiring standards. | | A3 | - | Not Used

This is the most critical section. If these wires are not correct, the radio will not turn on, or it will not turn off (draining your battery).

No multimeter? No problem. Use a 12V test light or a spare speaker: