The car I've borrowed has a non-working stereo. No idea if it's the head unit or something else. How easy would it be for me to diagnose/fix this as someone who has no idea of car electrics? It's a 52 plate punto so I imagine shouldn't be too complex
First check the wiring is all connected (you might need specific removal tools to get the stereo out of the dash - a penknife might suffice)
If it looks all connected securely, try fitting a new fuse.
The car I've borrowed has a non-working stereo. No idea if it's the head unit or something else. How easy would it be for me to diagnose/fix this as someone who has no idea of car electrics? It's a 52 plate punto so I imagine shouldn't be too complex