This afternoon I replaced my cars build-in radio (Sony CDX-S2050 for a Polarlander JSD-520). Everything works fine except for storing presets such as radio-stations and the clock. It stores as long as the key is in the cars ignition.
As all the cables I used were brand new, I assume that all of them are working fine, so my conclusion is that there must be something wrong in the way I've connected them. I noticed that there is something strange in the wiring from my older radio.
The wiring diagram tells me that the yellow wire is used for the continuous power supply (Battery) and the red wire is used for the switched power supply (Ignition). But both of them are reversed connected on the ISO-harness. In other words: The yellow cable is connected to the red wire (A7), and the red cable is connected to the yellow wire (A4).
My car (Volkswagen Golf MK4) never had any trouble saving presets, so the wiring for the old radio must have been correct. Perhaps the ISO wiring in my car is wrong? That's why I would like to know if it's save to try and reverse the wires the same way on my new radio, or would this cause a short circuit?