My car audio doesn’t have the AUX and I want to fix AUX by overriding FM on my car’s audio circuit. I have opened the car’s audio and it has MITSUMI F7424F fm tuner module (22 pin). I am not able to identify the correct pins to solder the AUX + and - so that the AUX input will be overriding the FM input. Can someone please help?
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Power on the car stereo then turn the volume down on the car stereo and set the car stereo to FM. Select an FM frequency between 88.1 MHz and 107.9 MHz that is not currently being used.
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lacking documentation, if you can get to the interface when the unit is functioning, with the tuner off station and volume turned up, touch each pin with your finger until one of the channels produces a hum. Then look for the other channel. The negative sides can be connected to chassis, or you can look for ground pins with an ohmmeter and power off or better totally disconnected.
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