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20 pin GM 13593932, 15491304 (15126710) Head Unit misc connector layout
20 pin GM 13593932, 15491304 (15126710) Head Unit misc connector
p/n 42554558, 42554623, 42554558

X1 31410-0201 (13593932)

Pin
Number
color Description Opt
1 BK Ground IOB
2 BK/GN Radio Display Backlight Low Reference IOB
3 BU/GN Radio Display Backlight Dimming Control IOB
4 GY/GN Low Speed GMLAN Serial Data #2 IOB
6 BK/GY Voice Recognition Audio Low Reference IOB+UE1
BK/BN Cellular Telephone Microphone Low Reference IOB-UE1
7 GY/YE Voice Recognition Audio Signal IOB+UE1
BU Cellular Telephone Microphone Signal IOB-UE1
8 VT/WH Radio Keypad Button Signal IOB
9 BK/YE Cellular Telephone Voice Low Reference IOB+UE1
10 YE Cellular Telephone Voice Signal IOB+UE1
11 RD/YE Battery Positive Voltage IOB
12 GN/YE Entertainment Remote Enable Signal IOB+NKC+UZ6
13 SR Camera Low Reference IOB+UVC
14 WH/BU Camera Signal 2 IOB+UVC
15 GY/YE Camera Signal 2 + IOB+UVC
16 BARE Auxiliary Audio Screen 2 IOB+USR
17 BU Auxiliary Detection Signal IOB+USR
18 VT Auxiliary Audio Common Signal IOB+USR
19 GY Left Auxiliary Audio Signal 2 IOB+USR
20 GN Right Auxiliary Audio Signal 2 IOB+USR

 

X2 13593933 connector

Pin
Number
Color Description Opt
3 BN/WH Radio Keypad Power Signal IOB
4 BN Radio Display Low Voltage Differential Signaling Lock Signal IOB
5 GY/VT Radio Display Low Voltage Differential Signaling Error Signal  
6 GY/BU Radio Display Touch Interrupt Request Signal IOB
7 WH Radio Display Diagnostic Signal IOB
8 BU Radio Volume Up Signal IOB
9 GY/BN Radio Volume Down Signal IOB
10 BK Ground IOB
11 WH Right Rear Speaker Control (+)  
12 BU/BK Right Rear Speaker Signal (-)  
13 GN Left Rear Speaker Control (+)  
14 GN/BK Left Rear Speaker Signal (-)  
15 YE/BK Right Front Speaker Signal (-)  
16 YE Right Front Speaker Control (+)  
17 BN/BU Left Front Speaker Signal (-)  
18 BU Left Front Speaker Control (+)  
20 RD/YE Battery Positive Voltage IOB

Omitted pins are Not Connected.

Should work with 

2018 Buick Regal Sportback
2018 Buick Regal TourX
2018-2019 Chevrolet Colorado
2018 Chevrolet Equinox
2018 Chevrolet Silverado 1500
2018 Chevrolet Silverado 2500 HD
2018 Chevrolet Silverado 3500 HD
2018 GMC Acadia
2018-2019 GMC Canyon
2018 GMC Sierra 1500
2018 GMC Sierra 2500 HD
2018 GMC Sierra 3500 HD

20 pin GM 15491305, 13593933 (15126709) Head Unit misc connector layout
20 pin GM 15491305, 13593933 (15126709) Head Unit misc connector
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Chevrolet (2018-2021) Equinox, GMC Terrain IOB Radio visual pinout:click to enlarge
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