Since you're Vibe has the moonroof, it probably came with the "Moon & Tunes" package, it would have come with a moonroof and a 200W amplifier under the passenger seat. My guess is that the whoever put in the Pioneer head unit removed the amp and bypassed the factory amp and speaker wires, but left the factory amp wires in place, and those now unused amp wires are what you see under the passenger seat.
yes. Joatmon is right. You're factory amp is under that seat. Or was there. If want one, bdragger was gonna buy mine, but he hasn't responded in a while. So, i don't know. Let me know if you're interested.Inder Singh
2008 Chevy Cobalt SS Turbo - Fun stuff under there somewhere 1998 Nissan Sentra - Sold2004 Pontiac Vibe - 107k and SoldCosmo CAI
if you have the aftermarket hu you dont need the amp all it does is cause problems because you are sending an amplified signal to and amplifier so you get some whacky volume problems and distortion
'03 VIBE AWDPioneer AVIC-N1MOMO 6.5" componets in frontMOMO 6.5" speakers in rearJL e6450 six channel ampJL 12" w3 subAlpine 120W amp powering the sub