I changed the battery in my 2010 Mazda Mazda 3 and now the battery doesn't work

SOURCE: the speedo on my 04 my mazda 3 doesn,t work I have

Have you checked the speed sensing unit that is attached to the transmission? Take her out and see if it's damaged or not or to see if there are any nicked wires

SOURCE: mazda 3 passenger window

your problem is in the power control feed. either the drivers or passengers switches are broken or the wire harness has a broken wire in it.

SOURCE: Car - interior fan control working but only on full or 1 bar

switch is bad look in salvage yard for new used arts

SOURCE: Subaru Impreza 2004 - both

Hi

Most definitely check out the headlight dimmer control switch. Isolate the wire that comes from the headlight switch to the headlamp bulbs for low beam and check to see if there is a short in the wire. You can find this wire by using a test light turn on the key and get a good ground with the test light poke the wire and see if the test light illuminates with the headlight switch on.
There is a daytime running light module that controls both low beams and the daytime running lights. The low beam bulbs may be OK. The high beams will work fine as they are not controlled through the module.
It may be possible to disable the daytime run lights by cutting the yellow wire going into the module and then connecting it to ground. Tape off the other end.
Check this video,it will help you locate and disable the day time running light:-

http://www.youtube.com/watch?v=v49PsrYEfx4

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SOURCE: I have a dodge caravan

If your airbag light is on, I think it is probably the clock spring. These are fun to replace. Go pick one up at a parts store for around 30 bucks and borrow their steering wheel puller. Disconnect your negative cable then wait 2 minutes so the airbag doesn't knock you into the back seat when you work on it. Take a socket set and remove the air bag, should be two screws. (Carefully!) Remove clips holding it in. Then sit it down always pointing it away from you. Then remove the steering wheel. Take the three screws (phillips head) out from under the cover to the steering wheel housing then remove the clock spring. Replace it the same way just go backwards in steps.