Bose Wiring Tips  I just copied this into this section of the
tech tips so it is not lost in the archives…. it is great info
that I think should be placed here… I have dont this without
99HT\’s permission but I hope that will not be a problem…. Now
here you go…. C5 Bose CD or cassette upgrade wiring notes Bose
CD/Cassette Stereo System The C5 Bose stereo system is based on
a modified Delco head unit. The \”Delco/Bose\” head unit, CD or
casssette, has four connectors called C1, C2, C3 and C4 on the
rear panel. C1/C2, which is a single siamese connector, is used
for all Delco head units, not just Bose. C1/C2 carry power,
ground, BCM data and the front and rear speaker wires.
Connectors C3 and C4, provide interfaces to the head unit
front/rear pre-amp outputs and front/rear power amp inputs. The
pre-amp\’s audio outputs on connector C4 go to the BOSE Signal
Processor, BSP, mounted above the throttle. The BSP
\”conditions\” the front/rear audio signals and then sends them
right back to the head unit internal 4 ch