Pinouts

J-01 (Main harness)

  • A. Left Front Speaker +
  • B. Battery 12V +
  • C. Left Front Speaker -
  • D. Right Front Speaker +
  • E. Pulsed Dimmer TNS+
  • F. Right Front Speaker -
  • G. Inverted Dimming
  • H. PWR Ant
  • I. Speed Pulse
  • J. Amp Remote
  • K. Nav: Parking brake
  • L. Telephone Mute
  • M. Nav: Reverse
  • N. Clockspring/ Wheel Controls
  • O. Not connected
  • R. Ignition (+12v for on)
  • S. Left Rear Speaker +
  • T. Not connected
  • U. Left Rear Speaker -
  • V. Right Rear Speaker +
  • W. Ground
  • X. Right Rear Speaker -

J-02 (Auxiliary Harness)

  • A. Ground
  • B. System Mute
  • C. Right channel Input +
  • D. Right channel Input -
  • E. Left channel Input +
  • F. Left channel Input -
  • G. Signal ground
  • H. Not connected
  • I. Not connected
  • J. Not connected
  • K. Bus -
  • L. Bus +
  • M. Not connected
  • N. Not connected
  • O. Accessories power (12V+)
  • P. 12V+

Sources

http://mazda-speed.com/faq/audio/#J-01