I have a 05 Impala with a multi-function entertainment system. A few weeks ago the system quit on me. All the bells and whistles give the appearance that they are working but no such luck. No sound from all systems. Fuses are OK. No GM TSB on this problem. Warranty expired and private extended warranty does not cover. Any help?

 

Check for a grounded speaker lead. Pull the radio out and check there with a multimeter

 

Dealer says no ground problen. Right hand instrument panel fuse block faulty. ?????

 

Broken wire going to the amp in the trunk.