Disconnecting battery

billydsz

I see that removing the negative terminal is always recommended when working on your car audio.

I have searched but didn't find an answer to these questions:

1. What do you lose when you disconnect the battery, ie presets, etc?
2. Do you have to enter some kind of code to reactivate the oem nav/audio head unit?
3. If you do lose information is there any way to maintain it while the battery is disconnected?
4. Any other problems with disconnecting the battery? Will I have to go to the dealer to get anything reset?

Sorry if these are dumb questions.

bigaudiofanat

The only thing you will have to reset is your windows your nav should remember your stuff but I am not sure about a code.

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kenchan

yah, i dont usually unplug the (-) battery terminal unless i need to do SRS work.

billydsz

Thanks guys I finished the work. After reconnecting the neg term, I only had to do the window reset, reset the dashboard clock, and the recent mpg's and trip data was reset to zero in the computer. Also the hvac system was completely off, just had to turn it back on. Oh and my audio settings (Bass, treble, etc.) were set to default. I haven't even looked at my radio presets yet I forgot. But that was it. I didn't have to enter a code to get the nav/audio system back up. (Some OEM car radios have this as a theft deterent).

edit: you lose the radio presets, I finally got around to checking it. Not a big deal, but a pain to reset them all.

ps
I had to pull the head unit out to add a mod. If you don't disconnect power when disconnecting factory connectors you can have error codes that require a reset at the dealer. Also you could short something out too and cause serious damage.

Thanks for the replys.

kenchan

i think removing the ground is a great habit and a good rule of thumb to follow.

that said, the only time you could get error codes is if you disconnected something while your car was on... or you forgot to connect and turned the car on. most of them you can clear it yourself using reset sequence or OBD2 scanners.

you could short something out and cause your fuse to blow. that's about the only risk as far as shorts unless you wired something new without a inline fuse.... if you're working on your SRS then the airbag could potentially deploy so for sure i remove the ground when working on steering wheels, or something that requires me to disconnect the yellow harness plugs inside the car.

not against unplugging the ground, but i dont do it all the time and found uncessary for HU swaps and small hardwiring projects that's all.

zedaholic

When you disconnect the battery, do you have to reset the trottle position sensors? I had this issue with my 350Z and was wondering if the same applies to the 370Z?

billydsz

Good question. I didn't, but how can you tell it's not set properly?

zedaholic

You'll get a check engine light and it will throw a code for an error with the throttle position sensor

Svre46

I pulled the battery last weekend doing my blinder install (awesome grommet to use to run the wires behind it)...anyway, I did not run into any error codes at all. I just had to program clock, presets, and initialize windows ect... Everything else was at default.

bigaudiofanat

You will probably never see a error code for throttle sensor after taking a battery out. You ecu takes care of all that.

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Need help with car audio or electronics? Let me know!! Need Help Let Me Know
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Juleous

I only had to reset the windows, plus the stereo, clock etc.

zedaholic

Thanks for the responses. I'll be reconnecting the battery this weekend and anticipate only having to reset the clock and possibly the presets on the radio.

Juleous

Your windows will need to be reset, first thing I noticed was the windows did not work when I reconnected the battery. Close the doors hold both buttons down 15sec, hold them up 15 sec. You can hear the doors clicking a couple of times during the process, that is all. Other than that the rest is easy to do, the window thing could really freak someone out if they did not know why they stopped working. I was expecting it and I found it weird at first, did the above process fixed first try no worries.

zedaholic

Thanks for the heads up!