Up for sale is a high-quality Clarion M309 Marine CD/USB/MP3/WMA Receiver. This is a rugged, marine-grade unit designed to withstand harsh environments, making it perfect for boats, off-road vehicles, or standard car installations. It has been fully bench-tested and is in excellent working condition.

​Key Features:

​Audio Enhancement: Features BBE MP (Minimized Polynomial) processing to improve the sound quality of compressed digital music.

​Expandability: Satellite Radio Ready and compatible with Bluetooth/iPod adapters.

​Display: High-visibility blue-lit rotary encoder and buttons for easy night-time use.

​Durability: Marine-certified faceplate and internal components.

​Condition & Included Accessories:

​Tested: Unit powers on perfectly and all speaker channels have been verified for clear audio output.

​Main Wiring Harness: Included. Please note the Blue (Power Antenna/Amp Remote) wire is shorter than the others and has a bare end.

​AUX 2 Adapter: Includes the plug-in RCA adapter labeled AUX 2, allowing you to connect external audio sources easily.

​Cosmetics: Good used condition with minor signs of wear consistent with age. Screen is clear and legible.

Bluetooth Ready – What does this mean?

This unit is "Bluetooth Interface Ready." It supports wireless hands-free calling and audio streaming (A2DP/AVRCP) but requires an external adapter

​Technical Specs:

​Power: 12V DC (Tested at 13.8V).

​Format: CD, MP3, WMA, AAC.

Clarion M309 Wiring Diagram & Pinout Guide

Power & Control Wires:

• Yellow: Constant +12V Battery / Memory (Connect to permanent power)

• Red: Switched +12V Ignition / ACC (Connect to ignition switch to turn unit on/off)

• Black: Ground (Connect to chassis or negative battery terminal)

• Blue: Auto Antenna (Used to trigger a power antenna - Note: Short wire on this unit)

• Blue with White Stripe: Remote Turn-on (Used to turn on external amplifiers)

• Orange with White Stripe: Illumination / Dimmer (Connect to vehicle dash light circuit)

• Brown: Phone Mute (Mutes audio when grounded by a hands-free kit)

Speaker Output Wires:

• White: Front Left Speaker (+)

• White with Black Stripe: Front Left Speaker (-)

• Grey: Front Right Speaker (+)

• Grey with Black Stripe: Front Right Speaker (-)

• Green: Rear Left Speaker (+)

• Green with Black Stripe: Rear Left Speaker (-)

• Purple: Rear Right Speaker (+)

• Purple with Black Stripe: Rear Right Speaker (-)