A small repair but important repair.

I was asked if I could repair a toy car, that had sentimental value. The car had multiple wires that were disconnected form it’s control board. There is of course no wiring diagram available. There were a number of buttons that controlled different sounds and effects. After finding out what each button did, I preceded to reverse engineer the circuit board. Managed to figure out all the wires connection point. Then created my own diagram for future.