Had battery changed at the dealer today on 2003 TT. Tech said he hooked up car to backup power while he changed battery (so radio should work). I noticed on the way home that the radio will turn on but no sound will come out of speakers. Is there anything I can do or does the car have to go back?

 

most likly you need to recode . think the code is assigned to your vin dealer will have it..

 

Code is per radio serial number. If you turn it on, and it says "CODE" PM me.

 

No this is not correct. You do NOT need to recode. CDR-23 "communicates" to the alarm system via the MOST bus (and a gateway to CAN). The alarm automatically recognizes and enables the radio when it's there, thus no need for codes. The only time this is not correct is if you actually replace the radio with a different radio. Now why the radio doesn't work...I would let the dealer sort that out. Most likely they disconnected something else.

 

Got me there, I didn't even look to see what year the car was, and assumed CDR-220. One other thing, I believe I had this once before, the fuse on the back of the radio itself was blown. Radio will still power up, but thats it. Something simple you can check anwyay if you have the radio removal tools.

 

Thanks for the quick replys. I let the car sit for 90min or so tried it again and it works! I quess they just scrambled its brains a little at the dealer....