Need a little help. I am installing a TNS from a 2008 Avalanche ltz into a 2009 chevy 1500 Silverado. It been unlocked by the dealer, but the volume is not working. It's on full volume. All the steering wheel buttons work except the volume. I take it I need a LUX amp, but not sure part number, or will a lux amp work from a 08 avalanche?
Thank you
Sean