radio sound goes in and out about every 20 seconds
Quite a bit of noise about this issue. From some of the posts I have read, the FIX was replacing the RADIO(not the Amp).
- Just as a quick try, Try disconnecting your negative battery post for about 60 seconds. Sometimes(but not always) this will clear an electrical glitch. It can’t hurt, and in fact, will give you the benefit of re-setting the PCM(like the Fuse 2 removal). Second thing I would check would be to plug connection in the back of the radio. Hope one of these two simple things may help you.
- Mine was fixed at the dealer. First they thought it was the amp which they replaced and still gave the same symptoms with everything working, just no sound. Then they replaced the radio and that solved the issue. So I ended up a new amp and a new radio. No problems since then.
(Source: challengerforumz.com)