Mazda Power Antennas Require A (-) Negative Trigger From The Radio

You may have noticed that your power antenna raises when the radio is turned on, and lowers when the radio or car is turned off. In order for this to happen, power antenna must know when the radio is on and off. Auto makers and stereo manufacturers design vehicles so that the radio sends a electric signal to the power antenna in order to accomplish this. 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.

New replacement radios are usually equipped with a blue wire designed to send a low current (usually less than 1 amp) (+) 12 Volt continual signal to a power antenna. This is opposite of the Mazda power antenna requirement.

In order for a new replacement radio to activate a Mazda power antenna up to 1992, the (+) 12 Volt positive power antenna wire must be converted to a (-) negative or ground wire in order to make the Mazda power antenna work.

Use A Relay To Convert A (+) Positive 12 Volt Wire To A (-) Negative Wire

You will need 1 SPDT relay for this install.



                                                                                                                                      by The Install Doctor