Clarion aux input

Here’s a quick and simple project to get a proper auxillary input for your iPod, etc on some models of Clarion OEM stereo.

Kevin Ferris 4 January 2025 / 03:28

I’m trying to do this on a Clarion PT9653 also known as a Mazda Finish Line 742. I have identified the 13 pin connections are different to all other models i can find schematics for. I believe the socket is intended for an in dash single CD player rather than a remote multi CD.

Printed on the circuit board are the following pin designations

2 = left channel in

4 = right channel in

5 = signal ground

7 = CD on

9 = CD stop

13 = CD mute.

all pins have close to 0V except for

Pin 7 = 1V only when powered on

Pin 8 = 12V even on standby

Pin 9 = 5V when powered on

I need to know how do i use pin 7 to tell the head unit to switch to the CD inputs so i can use a bluetooth audio device.

Should i ground it? Should i put 5V or 12V on to it?

I don’t want to damage it in the process of testing.

I hope you can help me.

Thanks.

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