When installing new radio was the connectors cut off? Have you checked fuses?When you state "but start to fail" could you explain?

Answered by Docfixit (expert)
18,443 answers provided

Yes, but I made a big mistake, even when I did made the connections properly, I didn't disconnect the ground battery. The new device started to fail after I unpluged the iPhone from its attached socket, so I re-installed the old one for a while. After disconnecting the old one (again today) and installing the new one -to show in the video the failures- the car electric system started to fail: The AC comes On everytime I turn the ignition key On, the gauges of the fuel and temperature are frozen and won't go down, the car door light won't come on when the car is Off but they work with the car On, the electric door locks work with manual use of the key but won't work with remote control, the flashing light work but the clock won't do it.

About the new device, the problem was primary the losing of the screen with lines like interference until the screen came blank.

I have disconnected everything, this is to say, antennas and whole wires are loose, nothing is connected to the radio system, neither the speakers. I have disconnected both battery terminals for a few minutes, I have checked all the fuses, and the problem still the same. I have the feeling that if not a grounding problem, something needs to be reset.

I know that it is my mistake to install the new device without disconnecting first the ground terminal, but now I want to know what to do to fix this problem.

Response from Nissanfun
2 questions asked

Check some fuses in engine box left side compartment fuse #2 also in car left side dash fuses #20-24-15-25

Answered by Docfixit (expert)
18,443 answers provided

Thanks! I replaced the fuse for the clock and the system appeared to be back to normal. Everything works, except the new receiver because I have not installed it back yet.

Please, I still have a question, why a blown fuse for the clock can mess up to many things, specially making the AC coming On by itself when you turn the key on ignition?

I'm glad I asked you for the solution, as an amateur who loves fixing (messing up) his car, I learn a lot and obtain more experience from experts like you.

Thanks again, but please don't forget to give me a brief explanation of how it happens that the AC is related and affected by the clock/door remote sensor/dash fuel-temperature gauges circuit. I don't need a class with specifications but I will love to have an idea of what happened. I was so confused, because for me a blew fuse will affect only the dedicated circuit, but this back-feeding to the AC circuit is crazy to me and I would never guess that the solution was very simple: just replacing a fuse.

From my part, I will be more careful and I will disconnect the battery negative before doing this and next electrical works.

Response from Nissanfun
2 questions asked

Fuse 25 powers AC controler, ETAC,Audio, Instrument cluster so when it blew relay to AC closed so when key was on AC was on. Be carful what you hook up to a ground a wire that appears dead and possible ground may be live when that circuit is activated. Getting a wiring diagram and a DVOM is a must for ANY ELECTRICAL WORK.

Answered by Docfixit (expert)
18,443 answers provided