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p/n LB83 66 9CO
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Head unit pinout abbreviations

Pin
Notation
Pin function

Power pins

B+ Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
ACC Ignition powered. +12 V with the ignition key is in the ACC or ON position.
 iLLUM Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on.
ANT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 

Audio pins

FR+ or RF+ Front right speaker out
FL+ or LF+ Front left speaker out
RR+ Rear right speaker out
LR+ or  RL+ Rear left speaker out
FR- or RF-, FL- or LF-, RR-, LR- or RL-, SGND The corresponding speaker ground

Misc. pins

MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
CAN-L, CAN-H CAN on board diagnostic bus

 

8 pin Mazda old Miata Head Unit connector layout
8 pin Mazda old Miata Head Unit connector
at the head unit
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Mazda Protege (1996-1998) MCT023U2-A Radio Stereo visual pinout:
Mazda Protege (1996-1998) MCT023U2-A Radio Stereo diagram
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