Calais factory Amp not working!

[BT91WA]

Hey guys im seeking a bit of help,

I recently replaced the door speakers in my calais with Pioneer coax;s and splits, all of which are powered by a 4Channel 600W Pioneer Amp, additionally I have kept the factory head unit so have hooked up the amp via Hi-Lo converters, all speakers are crimped into the converters.
After firing it up for the first time i noticed the Rear factory subs aren't getting powered.

Has this happened to anyone else?/ Can anyone suggest a reason why the factory amp isn't working?

[MAG00]

Are the wires from your headunit still connected to the amplifier? If you ran the wires into Hi-Lo convertors, my bet is you no longer have wires sending a signal to the amp...

Also, don't quote power ratings in max power, use the RMS wattage value for a true indication of power.