Vehicle Connections - Directed DB3 Installation Manual

Vehicle connections

The connection information listed below is specific to the 2021 GMC Sierra 1500. Refer to "Pre-installation and application warnings" for a list of important notes.
Data 14-pin blue connector (H1)
Module
Conn./Pin Color
H1/1 Light Green
H1/2 Violet/Yellow
H1/3 Tan/Black
H1/4 Tan
H1/5 Orange/Green
H1/6 Orange/Brown
H1/7 Brown
H1/8 Yellow
H1/9 Orange/Yellow
H1/10 Orange/Red
H1/11 Yellow/Red
H1/12 Brown/Red
H1/13 Red
H1/14 Black
Output 12-pin red connector (H2)
Module
Conn./Pin Color
H2/1 Black/White
H2/2 Green/Black
H2/3 Green/White
H2/4 Red/Black
H2/5 Violet/White
H2/6 Gray
H2/7 Gray/Black
H2/8 Violet/Green
H2/9 Violet/Brown
H2/10 Yellow/Black
H2/11 Orange/Black
H2/12 Blue/Red
Input 10-pin black connector (H3)
Module
Conn./Pin Color
8 403.GM10 4.27 2021 GMC Sierra 1500
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Description
(DATA) Single Wire CAN
No Connection
(DATA) HS CAN High
(DATA) HS CAN Low
No Connection
No Connection
Relay N.O. - (+) 12 Volt Input
Relay COM - (+) Ignition Output
Relay N.C. - No Connection
Relay N.C. - Immo. Data (conn. side)
Relay COM - Immo. Data (vehicle side)
Relay N.O. - No Connection
(+) 12 Volt Input
(-) Ground
Description
(-) Parking Light Output
[2]
(-) RAP Off Output
No Connection
[3]
(-) Lock Output
No Connection
No Connection
(+) Accessory Output
No Connection
No Connection
No Connection
(Data) Immo. Data (vehicle side)
[3]
(-) Unlock Output
Description
Connects To
Wire Location
BCM under driver dash, blue 27 pin plug, pin 22
No Connection
BCM under driver dash, white 26 pin plug, pin 25
BCM under driver dash, white 26 pin plug, pin 24
No Connection
No Connection
Ignition Switch, black 6 pin plug, pin 4
Ignition Switch, black 6 pin plug, pin 5
No Connection
Immobilizer Control Module on ignition switch, black 3 pin plug, pin 2
Immobilizer Control Module on ignition switch, black 3 pin plug, pin 2
No Connection
Ignition Switch, black 6 pin plug, pin 4
Connects To
Wire Location
BCM under driver dash, white 26 pin plug, pin 22
Driver Door Latch, green 10 pin plug, pin 1
BCM under driver dash, gray 26 pin plug, pin 25
No Connection
BCM under driver dash, gray 26 pin plug, pin 21
No Connection
No Connection
Ignition Switch, black 6 pin plug, pin 3
No Connection
No Connection
No Connection
Immobilizer Control Module on ignition switch, black 3 pin plug, pin 2
BCM under driver dash, gray 26 pin plug, pin 24
Connects To
Wire Location
(+/-) Wire Color
Data Green
Data Blue
Data White
+ Red/Blue (2A)
+ Violet/Black
Data Green/Violet
Data Green/Violet
+ Red/Blue (2A)
(chassis ground)
(+/-) Wire Color
- Green/Gray
- Gray or Pink (power window)
- Gray (manual window)
- Yellow/Violet
+ Violet/Yellow
Data Green/Violet
- Brown/Violet
(+/-) Wire Color