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2018 Mazda3 Without Bose, Stereo Wiring


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scblair72 
Member - Posts: 2
Member spacespace
Joined: February 05, 2021
Location: Pennsylvania, United States
Posted: February 05, 2021 at 2:23 PM / IP Logged Link to Post Post Reply Quote scblair72
New user looking for information on receiver wiring for my 2018 Mazda3 without the Bose head unit. I'm planning on adding an amp and cannot find a wiring diagram for this particular year anywhere. I'm assuming that the wire colors don't change that much from year to year, but better safe than sorry. Planning to use speaker-level inputs for the amplifier. Also the amp I might use has the ability to draw right from the receiver (15amp) and this wire is yellow usually?
I've done plenty of speakers and aftermarket radios in the past but that was before infotainment systems & backup cameras entered in to the picture, so the wiring is a bit more daunting.
i am an idiot 
Platinum - Posts: 13,286
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: February 05, 2021 at 8:46 PM / IP Logged Link to Post Post Reply Quote i am an idiot
Radio 12V      White      +      Radio in dash or Tuner above passenger kick, white 24 pin plug, pin 9           
Radio Ground      Black      -      Radio in dash or Tuner above passenger kick, white 24 pin plug, pin 16           
Radio Ignition      Gray      +      Radio in dash or Tuner above passenger kick, white 24 pin plug, pin 24           
Radio Illumination      Yellow (parking lights); Gray (dimmer)      +,-      Radio in dash, white 24 pin plug, pins 17, 18           
Factory Amp Turn-on      Tan      +      Tuner above passenger kick, white 24 pin plug, pin 10           
Power Antenna      (no wire color listed in service manual)      +      Radio in dash or Tuner above passenger kick, white 2 pin plug, pin 1           
Left Front Speaker (+/-)      Lt. Green - Red or Black - Red      +,-      Radio in dash or Tuner above passenger kick, white 24 pin plug, pins 1 - 2           Notes
Right Front Speaker (+/-)      Pink - Green or White - Green      +,-      Radio in dash or Tuner above passenger kick, white 24 pin plug, pins 3 - 4           Notes
Left Rear Speaker (+/-)      Blue - Gray or Green - Black      +,-      Radio in dash or Tuner above passenger kick, white 24 pin plug, pins 5 - 6           Notes
Right Rear Speaker (+/-)      Brown - Lt. Blue or Red - White      +,-      Radio in dash or Tuner above passenger kick, white 24 pin plug, pins 7 - 8           Notes
Center Channel (+/-)      Pink - Brown      +,-      Amplifier under passenger seat, green 16 pin plug, pins 4 - 5           
Aux. Audio Input Left (+/-)      White - Black or Green - Blue      +,-      Radio in dash or Tuner above passenger kick, white 24 pin plug (B), pins 5 - 17           
Aux. Audio Input Right (+/-)      Red - Black or Yellow - Blue      +,-      Radio in dash or Tuner above passenger kick, white 24 pin plug (B), pins 6 - 17           
Rearview Camera Video      Black - Red      +,-      Connectivity Master Unit-Display, white 28 pin plug, pins 1 - 15           
RSE Video (+/-)      Blue - Red (iPod video)      +,-      Connectivity Master Unit-Display, white 28 pin plug, pins 6 - 20           
RSE Audio Left (+/-)      Green - Black or Green - Red (CD audio)      +,-      Radio in dash or Tuner above passenger kick, white 24 pin plug (B), pins 7 - 19           
RSE Audio Right (+/-)      Red - White or Black - White (CD audio)      +,-      Radio in dash or Tuner above passenger kick, white 24 pin plug (B), pins 8 - 20           
Satellite Radio 12 Volts      (built into tuner above passenger kick)                
scblair72 
Member - Posts: 2
Member spacespace
Joined: February 05, 2021
Location: Pennsylvania, United States
Posted: February 06, 2021 at 12:06 PM / IP Logged Link to Post Post Reply Quote scblair72
Thanks much. Glad I didn't tap in to the yellow wire.
I discovered that it is really tight back there without much slack in the wire. Do you know of a company that makes a T-harness that would make the amp installation a bit easier. Most of the ones I've seen are for older Mazdas.
I looked at this one at Sonic Electronics and wondered if it would suit even though it's to add a camera: Axxess AX-ADDCAM-MAZ2. If not I may just make one.

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