Originally Posted by aaronhoy
I drive a 1988 325i Convertable.... So I took the tape deck part out of the radio, but now it doesn't accept the code. I type the code in the first time and it beeps and all that to say it got the code, but it stays saying "CODE" on the screen. Worse yet, you are supposed to have like 3 tries to enter the code or something, but with the tape deck out, once it beeps the first time that's it. I tried to make an equivalent circuit for the board that was part of the tape deck to trick the radio into thinking it was still there but this didn't help. any suggestions on how to fix this?
is the ETM. It will have a basic radio schematic. I don't remember who first posted the attached graphic (it sure wasn't me), but see if it will help. You may be to locate a radio manual from the OEM (Alpine, Pioneer, etc) at their website.
It sounds like you have the correct code. If the correct code doesn't work, there's a chance pulling the tape deck from the unit messed up the internal circuitry of the radio.
For those who lost or don't know the code (common problem), locate the serial/model number of the unit and post it here. They might find someone who can do a lookup. Otherwise they can take the number and their registration to a BMW dealer, and the service department can look up the code.
When the Alpine CDM-7833 unit in my son's 90 convertible crapped out, I bought a Blaupunkt unit (SD disk, with an aux jack for a diskman, iPod, etc). I didn't have a factory fader control to deal with. I used Molex pins and connectors plus the Alpine/Blaupunkt schematics to successfully wire the unit.