AMP1 mystery - no sound on doors or centre, O-Bus and other audio working ok
I want to throw this issue out to the forum before sending the car in for diagnostics.
Its a 2006 Aero Sedan with a Prestige 300 13 speaker non-navigation ICM and 6 CD front loader.
The issue I have is that the under seat AMP1 doesn't produce any sound to the doors or the center dash speakers. This has only recently happened after leaving the car with a auto electrician to get the HID Ballasts replaced. When I got it back from them, the unit was dysfunctional.
The O-Bus seems to be intact as the rear speakers, front dash left and right speakers together with all audio/radio/cd components are functioning correctly. The indicators are audible together with all other start-up and safety sounds made by the car.
What I do hear from the door speakers is a pop every 20 seconds or so. Like a burst of DC voltage being sent to them - and that is all.
Has anyone experienced this before? Usually when AMP1 blows the O-Bus link is broken and kills the whole system and the fiber optic needs a manual bypass - but this is not the case with me. Everything else works.
Could the Auto electricians (non-Saab) have damaged the ICM or corrupted some of the operation or error logic to knock AMP1 out of the loop?