I drive a 1988 325i Convertable. The cassette tape player part of the radio is dead, so I until now I have just tapped the speaker out lines and I have a switch to run them to the radio or to a discman I have velcroed to the dash. This worked ok except I wanted to integrate the cd player into the radio so that I can just switch the radio to tape mode and it will accept input from the cd player. This way the volume control knob and balance fader and whatnot will work the same for everything. 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? i wouldn't have a problem with just bypassing the code entirely, but the radio is complicated and I would need a schematic, which I cannot find.
any info would be very helpful