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      12-18-2020, 02:00 PM   #19
TboneS54
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Drives: 2004 M3 6spd & 2011 M3 DCT
Join Date: Nov 2009
Location: SoCal

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Quote:
Originally Posted by ptpending View Post
so, did you checked that correct rad_on signal comes to amp from radio ?
With an Oscope, we saw sound waves travelling through the wires into the amp. But with a heat gun, it didn't look like the amp was amplifying (not warming up). Power/ground were good. Battery is good. So then I tried another, known-to-be-working amp, but that didn't make a difference. I even disconnected the battery and left the key in in order for the system to "see" the new amp, but still didn't do anything.

Is that what you meant or is there another way to check?
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