AMP1 mystery - no sound on doors or centre, O-Bus and other audio working ok

[Heinz]

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?

[Oldsaabguy]

or he blew the speakers. ?? try a reboot and see if they work. Those amps arent the best, do go bad.

[CarbonFlash]

Well the AMP 1 is a common failure. I don't think at all that it blows the whole fiber optic system as many people have replaced the AMP 1 without any issues. Mine went on my '03 and replaced under warranty and all was fine. I believe there "radio rebuilders" that can repair or rebuild your unit for a reasonable price.

[NackoDuck]

I had the popping sound with my 2006 9-3 Aero SC. Sometimes it would elevate into a loud static like noise. I had the unit rebuilt by saabradio.com.

The rebuilt unit works fine.