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Quadlock Stereo Connector - Facelift

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The Ford Mondeo hit our roads in 1993, and has consistently been a sales success. Now on its 4th incarnation, it remains a drivers favourite.
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Note: This wiki article details the functions of all pins in the Quadlock connector. Depending upon the stereo specification, several of the pins will be unused.

The following figure illustrates the connector layout and gives pin numbers which correspond to the lists below.


Connector A (C517/C518)

Speakers (C517)

Pin 1 Right Rear +

Pin 2 Right Front +

Pin 3 Left Front +

Pin 4 Left Rear +

Pin 5 Right Rear –

Pin 6 Right Front –

Pin 7 Left Front –

Pin 8 Left Rear –

Power (C518)

Pin 9 CAN +

Pin 10 CAN –

Pin 11 Keycode Ground

Pin 12 Ground

Pin 13 Alarm Sense (From GEM)

Pin 14 Illumination

Pin 15 Battery + (From F72)

Pin 16 Ign. Sense (Accessory) (From F69)

Connector B (C520)

Pin 1 Mono +

Pin 2 Sw A+ (Switched Output (On when stereo is on) - Used with Rear Seat DVD's)

Pin 3 Aux L+ (CD Changer)

Pin 4 Aux R + (CD Changer)

Pin 5 PTA (Phone Mute)

Pin 6 SWC (Steering Wheel Controls)

Pin 7 Mono -

Pin 8 SWC Gnd (Steering Wheel Controls)

Pin 9 Aux L – (CD Changer)

Pin 10 Aux R – (CD Changer)

Pin 11 Rev Sense (Used for Navigation)

Pin 12 AVC - Speed signal for Auto Volume Control

Connector C (C519)

Pin 1 RSE L+ (Rear Seat Entertainment)

Pin 2 RSE R+ (Rear Seat Entertainment)

Pin 3 Mono 2 +

Pin 4 Sub W +

Pin 5 Aux 2 L (Glovebox Aux Socket L)

Pin 6 Audio Gnd

Pin 7 RSE L – (Rear Seat Entertainment)

Pin 8 RSE R – (Rear Seat Entertainment)

Pin 9 Mono 2 –

Pin 10 Sub W –

Pin 11 Aux 2 R (Glovebox Aux Socket R)

Pin 12 Mic.

Submitted by DJAZS