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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 42645338, 42645351

 

20-way 15491304 (15126710) connector

Pin
Num
Color Signal Opt
1 BK Ground  
2 GY/BN N/C  
3 BN N/C  
4 GY/GN Low Speed GMLAN Serial Data #2 IOB
5 GY/YE Camera Signal 2 +  
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 BN/GN Display Radio Bank Switch Signal 2 IOB
9 BK/YE Cellular Telephone Voice Low Reference UE1+IOB
10 YE Cellular Telephone Voice Signal UE1+IOB
11 RD/VT Battery Positive Voltage  
13 GN/BU Local Interconnect Network Serial Data Bus 10  
14 WH/BU Camera Signal 2 IOB
15 GY/YE Camera Signal 2 +  
16 BARE Auxiliary Audio Screen 2  
17 BU Auxiliary Detection Signal  
18 VT Auxiliary Audio Common Signal  
19 GY Left Auxiliary Audio Signal 2 IOB
20 GN Right Auxiliary Audio Signal 2 IOB

 

20-way 15491305 (15126709) connector

Pin
Num
Color Signal
3 GY Radio On Signal
4 VT/GY LCD Dimming Signal
5 GY/D-BU Display Radio Bank Switch Dim Signal
6 BN/L-GN Video Display Request Signal
7 BN/L-GN Navigation Display Reset Signal
8 D-BU Radio Volume Up Signal
9 GY/BN Radio Volume Down Signal
10 BK Ground
11 WH Right Rear Speaker Control (+)
12 D-BU/BK Right Rear Speaker Signal (-)
13 L-GN Left Rear Speaker Control (+)
14 L-GN/BK Left Rear Speaker Signal (-)
15 YE/BK Right Front Speaker Signal (-)
16 YE Right Front Speaker Control (+) 1
17 BN/D-BU Left Front Speaker Signal (-) 1
18 D-BU Left Front Speaker Control (+) 1
20 RD/VT Battery Positive Voltage

 

Omitted pins are Not Connected.

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 (2017-2019) Silverado, Tahoe, GMC Sierra, Yukon IOB Radio Unit visual pinout:click to enlarge
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