Hi, I just picked up a 1991 420sel with a couple of problems. I hope you all will let me pick your brains. First I have a high idle problem...the engine runs at almost 2k in park. Second problem is the radio and cd do not come on. The car had sat for 4 years before I purchased it and the battery was dead. I was told by the previous owner that the sound system worked great before he stored the car. Question.#1 Do these becker systems require codes to restore them to operation? #2 does anyone have these codes? Thanks in advance.