1985 Mazda and Pioneer no wiring harness?

Check here: http://cgi.ebay.com/Car-Radio-Wiring-Wire-Mazda-RX...

If you want to hard wire it;

Radio 12v - blue/red @ radio harness

Radio Ground (chassis)

Radio Ignition - blue/white @ radio harness

Radio Illumination red/black @ radio harness

Factory Amp Turn-on white @ radio harness

Power Antenna blue/yellow @ radio harness

LF Speaker +/- lt. green/red - lt green/black @ radio harness

RF Speaker +/- lt. green - lt. green/yellow @ radio harness

LR Speaker +/- brown/white - brown @ radio harness

RR Speaker +/- blue/orange - blue @ radio harness

If equipped, the rear speaker amplifier is behind the radio.

While the harnesses you've seen may say '86 and up RX-7, Scosche lists the same harness for the '85. I certainly don't know of any other Mazda harnesses for that year.

http://www.scosche.com/scosche_caraudio.aspx?ItemI...

My advice would be to go ahead and remove the factory radio, then drive the vehicle to a car audio retailer so they can look at the plugs and find you the right harness. I would only try hard-wiring the new radio as a last resort.

scroll to the end you will find the older mazda

good luck be very carefull with the plastic trim it gets damage very easy