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1992-Up Mazda Radio Wire Harnesses

November 27th, 2010 · No Comments

Note: using an optional snap on wire harness adapter will simplify the wiring. Most snap on wire harness adapters have already converted and color coded the wires from the auto makers in dash wire harness to match typical aftermarket radio wire colors. The wire colors listed in the chart above are typical for these vehicles during these years but may not be the exact colors for this vehicle. This is another reason to use a snap on wire harness adapter.
INSTALLATION NOTE: For vehicles with power antennas
Every auto manufacturer uses a (+) positive electric signal from the radio to the power antenna, EXCEPT Mazda up to 1992. Mazda, instead, used a (-) negative electric signal to trigger the power antenna. When the radio turned on, the radio would send a (-) negative electric signal to the power antenna and the power antenna would raise. When the radio or the vehicle was turned off, the electric signal would stop and the power antenna would lower. In order for a new replacement radio to activate a Mazda power antenna up to 1992, a SPDT relay must be used. See diagram below.
Convert A (+) Positive Voltage Wire To A (-) Negative Voltage Or Ground Wire
Application: To convert Mazda power antennas up to 1992 to work with new replacement radios Understand: A (+)12 Volt wire connected to the inductor coil (85 or 86) will switch the relay to connect a (-) negative wire to the output contact (from 87 to 30)
Relay Contact Connections
30: (-) Output from relay to Mazda power antenna
87: (-) Negative or ground wire connected to relay
86: Power antenna wire from new replacement radio
85: (-) Negative or ground wire
For best results and quicker installation, use the same (-) negative or ground wire for both 85 and 87

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