I was sitting in a drive thru. All of my warning lights came on at 1 time and my power steering and audio system and lcd display went out. I discovered after troubleshooting that my alternator went out. I replaced it and all the warning lights went off and power steering started working. My audio head unit and my lcd display still doesn't work AC and heat work fine. so far I have pulled the unit and checked the pins in the front checked the cabin fuse all related fuses and all relays. Disconnected the battery for 15 minutes and reconnected Read every troubleshooting guide online the internet please help! I have seen the same problem posted everywhere but no solution I have taken to dealership and they do not work on audio systems

Help help help I miss my bose system

 

Aftermarket headunit? That's the only reason I could see a dealer not wanting to touch it..... If it's stock, then you're getting pushed around by your dealer. I'd report them to Mazda.

It sounds like a fuse to me. It's obviously not a connection problem. I'd check all the fuses with a multimeter. FYI, they all have test points on each side of the amperage markings. Run your probes down the line and you should have the whole panel done in 60 seconds. Check the ones under the hood too. If you don't find anything, remove the headunit and test for +12V battery and +12V ignition power in the harness. If you don't have power, then it certainly has to be a fuse somewhere. If you have both +12V power sources and ground, then the headunit should power on no ifs ands or buts. If it doesn't, it's toast.

 

No it is the original Bose head unit. I live 60 miles from the nearest Dealer. They had just opened the dealership in March. May be why they blowed me off. I did check all the fuses in fact I bought all new ones. I have not checked the 12 v power to the head unit. I will pull it tomorrow and get back to you. Thanks for the help.