2020 Chevrolet Express Van - North America
Item Wire Color Polarity Wire Location
12 Volts Red/White (10A) + BCM under passenger dash, black 25 pin plug, pin 1
Second 12 Volts Red/Black (125A) + Body Fuse Box under driver seat
Ground (chassis ground)
Starter Kill Violet + Underhood Fuse Box, gray 56 pin plug, pin E1
Second Starter Pink (R Code) (see Tech Doc 1605) + 9600 Ohms Ignition Switch, black 6 pin plug, pin 5
Ignition Pink + Ignition Switch, black 6 pin plug, pin 2
Accessory Brown + Ignition Switch, black 6 pin plug, pin 3
Second Accessory (same as second starter) + 6300 Ohms
R Code Pink MUX Ignition Switch, black 6 pin plug, pin 5
Keysense (same as second starter)
CAN Bus High Blue Data OBD-Data Link Connector, black 16 pin plug, pin 6
CAN Bus Low White Data OBD-Data Link Connector, black 16 pin plug, pin 14
CAN Bus SW Dk. Green Data OBD-Data Link Connector, black 16 pin plug, pin 1
OBD 12 Volts Red/White (20A) + OBD-Data Link Connector, black 16 pin plug, pin 16
OBD Ground Black/White - OBD-Data Link Connector, black 16 pin plug, pin 4
OBD Connector Black Under Driver Dash, Behind Parking Brake Release
IMMO Data Dk. Green Data Immobilizer Control Module on ignition switch, black 5 pin plug, pin 4
IMMO Power Red/White + Immobilizer Control Module on ignition switch, black 5 pin plug, pin 1
Power Lock Pink/Black - Driver Kick, door harness --or-- BCM under passenger dash, gray 28 pin plug, pin 12
Power Unlock Orange/Black - Driver Kick, door harness --or-- BCM under passenger dash, gray 28 pin plug, pin 11
Power Unlock - Driver Door Yellow - BCM under passenger dash, gray 28 pin plug, pin 6
Lock Motor Gray Reverse Driver Kick, black 40 pin plug, pin B8
Driver Unlock Motor Tan Reverse Driver Kick, black 40 pin plug, pin B7
Passenger Unlock Motor Tan Reverse Passenger Kick, door harness --or-- Body Fuse Box under driver seat, black 56 pin plug, pin J4
Parking Lights Brown + Body Fuse Box under driver seat, gray 56 pin plug, pin B4
Parking Lights - Lt. Blue - BCM under passenger dash, white 25 pin plug, pin 8 --or-- Headlight Switch
Hazards White - BCM under passenger dash, green 27 pin plug, pin 19 --or-- Hazard Switch
Turn Signal (Left) Lt. Blue/White (LF); Yellow (LR) + BCM under passenger dash, brown 25 plug, pin 4 (LF); pin 1 (LR)
Turn Signal (Right) Dk. Blue/White (RF); Dk. Green (RR) + BCM under passenger dash, black 25 plug, pin 5 (RF); brown 25 plug, pin 2 (RR)
Headlight White (also need to trigger parking lights (-)) - BCM under passenger dash, white 25 pin plug, pin 12 --or-- Headlight Switch
AutoLights Dk. Green - (Off) BCM under passenger dash, white 25 pin plug, pin 17 --or-- Headlight Switch
Reverse Light Dk. Blue + BCM under passenger dash, white 25 pin plug, pin 22
Left Front Door Trigger Gray/Black (ajar) - BCM under passenger dash, pink 25 pin plug, pin 10
Left Front Door Trigger 2 Tan (open) - BCM under passenger dash, gray 28 pin plug, pin 23
Right Front Door Trigger Tan/White - BCM under passenger dash, pink 25 plug, pin 8
Left Rear Door Trigger Dk. Blue/White - BCM under passenger dash, pink 25 plug, pin 15
Right Rear Door Trigger Yellow/Black - BCM under passenger dash, pink 25 plug, pin 14
Dome Light Gray/Black or Dk. Blue/White + BCM under passenger dash, white 25 pin plug, pin 5
Trunk/Hatch Pin Pink/Black - BCM under passenger dash, pink 25 plug, pin 12
Hood Pin Pink/Black - BCM under passenger dash, black 25 plug, pin 17
Trunk/Hatch Release Yellow (unlock rear cargo door only) + BCM under passenger dash, gray 28 pin plug, pin 2
Power Sliding Door (Left) Lt. Blue (F); Lt. Green (R) (left side access panel) - BCM under passenger dash, black 25 plug, pin 24 (F); pin 11 (R)
Power Sliding Door (Right) Lt. Blue (right side access panel) - BCM under passenger dash, black 25 plug, pin 20
Tachometer Dk. Blue/White (gas) AC ECM on driver fender, black 73 pin plug, pin 60
Tachometer 2 Yellow/Violet (diesel) AC ECM on driver fender, black 96 pin plug, pin 41
Wait to Start Green/Brown - Instrument Cluster, black 20 pin plug, pin 9 --or-- ECM on driver fender, black 66 pin plug, pin 19
Fuel Pump Gray + Underhood Fuse Box, black 30 pin plug, pin B1
Rear Defroster White + Latched Body Fuse Box under driver seat, gray 56 pin plug, pin C4
Mirror Defroster (same as rear defroster)
Speed Sense Dk. Green/White or Yellow/Black (gas) AC ECM on driver fender, blue 56 pin plug, pin 50
Brake Wire Lt. Blue/White (functions with ignition on only) + BCM under passenger dash, brown 25 plug, pin 6
Parking Brake Lt. Blue - BCM under passenger dash, brown 25 plug, pin 16 --or-- Parking Brake Switch
Horn Trigger Tan - BCM under passenger dash, brown 25 plug, pin 18 --or-- Horn Switch
Wipers Gray + BCM under passenger dash, brown 25 plug, pin 20
Left Front Window (Up/Down) Dk. Blue - Brown A Driver Window Switch, black 8 pin plug, pins G - H
Right Front Window (Up/Down) Lt. Blue - Tan A Driver Kick, black 40 pin plug, pins D5 - D4
Radio 12V Red/White + Radio, black 14 pin plug, pin 1
Radio Ground Black/White - Radio, black 14 pin plug, pin 8
Radio Ignition Dk. Green (delayed accessory) (with power window) + Driver Kick, black 40 pin plug, pin D6
Radio Illumination Yellow (dimmer) + Radio, black 14 pin plug, pin 7
Left Front Speaker (+/-) Dk. Blue - Lt. Blue +,- Radio, black 14 pin plug, pins 2 - 9
Right Front Speaker (+/-) Orange - Dk. Green +,- Radio, black 14 pin plug, pins 3 - 10
Left Rear Speaker (+/-) Tan - White +,- Radio, violet 16 pin plug, pins 5 - 13
Right Rear Speaker (+/-) Tan - Orange +,- Radio, violet 16 pin plug, pins 6 - 14
Satellite Radio 12 Volts Red/White + Digital Radio under driver dash, 16 pin plug, pin 16
Satellite Radio Ground Black/White - Digital Radio under driver dash, 16 pin plug, pin 9
Satellite Radio Ignition (Low Speed GMLAN)
Satellite Radio Antenna (coaxial cable)
Satellite Audio Left (+/-) Brown/White - Tan/White +,- Digital Radio under driver dash, 16 pin plug, pins 2 - 1
Satellite Audio Right (+/-) Dk. Green/White - Gray +,- Digital Radio under driver dash, 16 pin plug, pins 3 - 4
What Fits?
Item Size Depth Location
Headunit Double DIN Center of Dash
Left Front Speaker 6.5 Left Front Door
Right Front Speaker 6.5 Right Front Door
Left Rear Speaker 5 Left Rear Cargo Door
Right Rear Speaker 5 Right Rear Cargo Door
Gary Sather