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What is the level of technical expertise required to safely and successfully complete this modification?
Pin number 3 seems to be responsible for the memory feature, and I need a constant supply. To identify the right pin for a 12-volt power source that turns on with the ignition, I'm planning to use a multimeter or a small bulb.
Did you encounter any unexpected benefits or drawbacks after implementing the modifications to your head unit?
Pin number 3 is there probably to give a constant supply for the memory feature of the headunit. Another one of those pins should get 12v when the ignition comes on. If you have a multimeter, you can check the pins one by one by turning the ignition on and off or you could use a small bulb aswell. Another source of getting the power so that it cuts out when the ignition is off is the cigarette lighter's power.