RCA Trouble

[ThreeFiftyZ]

Head unit is the Pioneer p4000dvd...

It has front RCA's and rear RCA's but no seperate RCA's for the sub. I have the rear's and subs split with cables. I noticed today that I wasn't getting audio out of my rear speakers...just the subs. I unplugged the rear RCA's and plugged them in to the front RCA's on the HU and the audio and subs were perfect. I then took the front RCA's and plugged them in to the rear output from the head unit and got nothing. Has my head unit gone bad? I know this all sounds confusing, but I'm wondering why everything works perfectly out of the front RCA outputs and only the subs will work out of the rears.

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