Hey guys, I lost power to my radio last week, all of the fuses seem to be good and I replaced the multi-function relay as well. The radio is the only issue I am having at this time. Any suggestions of places to look for a problem would be greatly appreciated! Thanks.
I would pull the multi-function relay (k134) and verify 12 volts at pin 12 on the socket (voltage from the fuse). Turn the key on, and verify there is a ground at pin 11 (ground from the BCM). If you have both of those, turn the key off and jumper between pins 12 and 14. Turn the key on and see if the radio works now. If it does, then the relay is bad. If it doesn't, the radio or the wire/connector to it is bad.
Don't know your skill level, so just ask if your not sure how to do those things. If the pins on the socket aren't labeled, I could probably post a pic of it from the manual.
Yes, I would say that's the next step. Hopefully it is something obvious, or maybe a dirty connector.
When you have the radio connector off, see if you can read 12v at pin F1, the solid red wire. It should be at one of the corners. The bcm won't be able to talk to the radio so you may have to jumper pins 12+14 at the relay socket.
I just saw your follow up note. Yep, sounds like you have power to it.
Maybe you can tell me what I would be experiencing if somehow the radio had lost programming? Does it still have a display or function of any kind because I have nothing except the cd player eject and the clock will come up "12:00" when I hold the HR button down....If the problem is with the radio I will just order a new one they seem to be pretty cheap and available. I just don't want to replace it if there isn't anything wrong. Thanks for the help btw.
Rolo, this is a bit of an older post, I've since sold the catera and bought a Mercedes clk 430. I liked driving the catera better. I don't have the manual on my computer anymore so I can't be of much help, but it sounds like you might have more of an anit-theft issue than a power issue.