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it may be your alternator that is draining your battery and causing problems. I have replaced my alternator two years in a row on my 2003 Corolla...also having other electrical problems with the radio and cd player. I have been reading where this is a common problem :(
Unfortunately 90% of the time when you get error codes from the CD player/changer it means that there is a mechanical failure in the CD player/changer unit itself and it usually requires CD player/changer rebuild or replacement... First make sure you have entered the correct anti-theft code. If battery power has been disconnected recently than the stereo display will read CODE if the incorrect anti-theft code is entered the display will read ERR1 thru ERR3. If this is the case you'll have to get the correct anti-theft code. Note; If you enter the incorrect code three times the stereo locks up. Disconnect the battery for more than 30 seconds and then retry. FYI;Never use adhesive labels or protective disc covers on recordable CD's. Recordable CD's are actually thicker than pre-recorded CD's. Automotive players and changers use rollers to draw the disc into the unit. The added thickness of an adhesive label or protective disc cover may cause the disc to jam. Also CD players and changers are exposed to high temperatures inside the vehicle. High temp will cause the labels adhesive to soften which may cause the labels edges to curl or cause it to bubble. Either one may cause the disc to jam. If the player can not be disassembled and have the discs removed successfully than it will have to be replaced. -hope this helps.
IF U REVERSED POLARITY, UR PROBABLY GOING TO HATE URSELF!!! RED WIRE IS ALWAYS + AND WHITE WIRE IS ALWAYS -. WHEN THERE IS A BLACK AND RED WIRE PRESENT, RED IS ALWAYS + AND BLACK IS -. CONNECT UR BATTERY WIRES PROPERLY AND HOPEFULLY EVERYTHING WILL WORK FINE, IF NOT, CHECK UR FUSES...IF THEY'RE GOOD, THEN THE COMPUTER MOST LIKELY GOT FRIED...
If the car still runs then the problem is not major but may develop into one if unchecked. The sensors in the engine may have detected problems and should be stored in its ECU. If you have a scanner have it connected to the diagnostics it should give you a clue on what to check out.