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20 pin Nissan Head Unit Audio main connector layout
20 pin Nissan Head Unit Audio main connector
at the head unit
p/n 28185-3TA0G, model PN-3378I
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20 pin Nissan Head Unit Audio main

Pin
Num		 W/C Signal
2 V
Sound signal front speaker LH (+)
 
3 SB
Sound signal front speaker LH (-)
 
7 P
ACC power supply 
 
8 GR
Illumination control signal (-)
 
9 R
Illumination control signal (+)
 
11 Y
Sound signal front  speaker RH (+)
 
12 BR
Sound signal front speaker  RH (-)
 
18 G Vehicle speed signal
19 Y
Battery power supply
 
20 GR Ground

W/C stands for Wire Color. It is for Pathfinder 2014 and very dependent on model and model year.

16 pin Nissan Head Unit pre-amp

Pin
Num		 W/C Signal
27 SB
AV communication signal (H)
 
28 LG
AV communication signal (L)
 
35 SB AV communication signal (H)
36 LG AV communication signal (L)

8 pin Nissan Head Unit

Pin
Num		 W/C Signal
38 W Microphone power supply (5V)
39   shield, Microphone signal ground
40 B Microphone signal

 

Pin
Num		 W/C Signal
45 B Antenna amp. ON signal
46 B AM/FM antenna signal
47   shield
16 pin Nissan Head Unit pre-amp connector layout
16 pin Nissan Head Unit pre-amp connector
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8 pin Nissan Head Unit connector layout
8 pin Nissan Head Unit connector
Nissan (2013-2016) Altima Base Factory Head Unit visual pinout:click to enlarge
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