2020 Chevrolet Tahoe PPV / SSV and Suburban Wiring Diagram
Police (9C1 PPV), special service (5W4 SSV) and government Tahoe and Suburban.
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Which wires give constant, ignition and ground on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
On a 2020 Chevrolet Tahoe PPV / SSV and Suburban, take constant power from the Red/Violet wire at the BCM blue 27-pin plug, pin 4, ignition from the Violet/White wire at the police harness under the center dash (circuit 239/1939), and ground to clean, bare body metal. Meter every wire first.
Written by API Signal, fleet GPS and camera installers for 35+ years across Georgia, South Carolina and North Carolina, installing every major telematics and camera brand. Every wire on this page lists its source.
Test every wire with a meter before you tap it
No wiring information is ever guaranteed. Colors and locations change with trim, options and build date, and the manufacturer can change them in the middle of a model year. We share this as a starting point for installers, and you are responsible for confirming every connection on the truck in front of you.
This page covers the 2020 Chevrolet Tahoe PPV and SSV (police and special service), and government Tahoes and Suburbans.
The police harness colors come from GM's own 2020 Tahoe police spec guide, and the civilian BCM colors from 2016 and 2018 Suburban sheets. Our own team has not yet metered these on a 2020 vehicle, and each row says so.
OBD-II portUnder the driver dash
Best power spotGM police harness
System voltage12V
Ignition typeKey (police)
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Where do I get constant, ignition and ground on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Take constant, ignition and ground from the same area. Police and special service Tahoes carry a GM police harness under the center dash with ignition, accessory, speed and park wires, and GM's battery stud is in the cargo area.
Option 1 Police harness
GM police harness, under the center dash
Blunt-cut GM wires on PPV (9C1) and SSV (5W4) Tahoes, with a second coil at the rear electrical center in the cargo area.
Constant
Battery stud
Rear electrical center, left rear cargo area, 100A battery studGM's police battery feed is a stud, not a colored wire. GM's Tahoe police spec guides.
Ignition
Violet/White
Police harness under the center dash (circuit 239/1939)Hot in run and crank. GM guides for 2015, 2016, 2018, 2019 and 2020 agree.
Ground
Ground stud
Two M10 ground studs, left and right cargo areaGM ground studs (option UT7); the driver side comes with 5 ft of 8-gauge wire.
Accessory
Violet/Yellow
Police harness under the center dash (circuit 43)Hot in accessory and run.
Yellow/Black (circuit 5813) is the park signal and Green/Gray (817) vehicle speed, in the same harness.
Option 2 Civilian BCM
At the BCM
Body control module under the driver dash. Colors from Suburban installer sheets (2016 and 2018).
Constant
Red/Violet
BCM blue 27-pin plug, pin 4Always hot, 20A. 2016 and 2018 Suburban sheets agree.
Ignition
Violet/Black
BCM green 25-pin plug, pin 6, or the ignition switch black 6-pin, pin 2Hot in run and start.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
Accessory
Violet/Yellow
BCM green 25-pin plug, pin 5Hot in accessory and run.
These are the same colors as the 2014 to 2018 Silverado 1500.
Power wires from GM's Tahoe police spec guides (OEM, 2015 to 2020) and installer sheets for 2016 and 2018 Suburbans.
What are the turn signal, reverse and light wires on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Blue/White (police harness and BCM front)
Yellow/Blue (rear, BCM)
Police harness under the center dash (circuit 5186); BCM brown 26-pin, pins 2 and 1GM's police harness turn wire, plus the civilian BCM wires from the 2016 Suburban sheet.
Right turnPositive +Not yet checked
Yellow/Gray (police harness)
Green/Violet (front, BCM)
Brown/Green (rear, BCM)
Police harness (circuit 5187); BCM black 26-pin, pins 3 and 4Flashes with the right signal.
Park lightPositive +Not yet checked
Violet/Gray (left)
Gray/Brown (right)
Green/Gray (switch, negative)
Underhood fuse block brown 58-pin, pins G1 and F1From the 2016 Suburban sheet. Violet/Gray is also the liftgate wire; go by plug and pin.
HeadlightNegative -Not yet checked
White/Violet
BCM white 26-pin, pin 16Headlight switch input.
ReversePositive +Not yet checked
Blue/Brown
BCM brown 26-pin, pin 26Hot in reverse.
Dome lightPositive +Not yet checked
Gray
BCM gray 26-pin, pin 1Dome output.
Each chip shows the main insulation color with its stripe. Each row names its source.
Where are the brake, door, speed and CAN wires on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
White/Blue (police harness)
Violet/White (BCM)
Police harness (circuit 6311); BCM black 26-pin, pin 11Hot with the brake applied. White/Blue is also the upfitter relay 4 control wire in the same harness; meter it.
In parkPositive +Not yet checked
Yellow/Black
Police harness under the center dash (circuit 5813)Switched 12V in park with the engine running. GM's Tahoe police spec guides.
Vehicle speedAC signalNot yet checked
Green/Gray
Police harness (circuit 817); civilian: dash junction block gray 50-pin, pin 474,000 pulses per mile. An aftermarket guide adds a 5k ohm resistor.
DoorsNegative -Not yet checked
Gray
Violet/Gray (liftgate)
Window switches (doors); BCM pink 27-pin, pin 5 (liftgate)Door and liftgate triggers, from the 2016 Suburban sheet.
Parking brakeNegative -Not yet checked
Blue/Violet
BCM white 26-pin, pin 10Grounds with the parking brake set.
Lock / unlockNegative -Not yet checked
Brown/Yellow (lock)
Brown/White (unlock)
BCM blue 27-pin, pins 19 and 15Brown/White is also the horn wire on another plug.
HazardNegative -Not yet checked
Green/White
BCM blue 27-pin, pin 26Hazard switch input.
Upfitter relaysPositive +Not yet checked
Blue (relay 1 load)
Gray/Black (relay 2)
Yellow/Brown (relay 3)
Red/Green (relay 4)
Relays in the underhood fuse block; wires under the center dashFour 30A GM relays. Control wires (to ground): Red/White, Yellow/White, Green/Gray, White/Blue. GM UI Bulletin 118c, 2015 and newer.
CAN busDataNot yet checked
Blue (high)
White (low)
BCM white 26-pin, pins 25 and 24From the 2016 Suburban sheet. Never cut or splice them.
Sources: GM's Tahoe police spec guides for 2015, 2016, 2018, 2019 and 2020 and GM UI Bulletin 118c (OEM), installer sheets for 2016 and 2018 Suburbans on the12volt, and an aftermarket police install guide (Ray Allen). No 2017 guide was found.
Which years share wiring with the 2020 Chevrolet Tahoe PPV / SSV and Suburban?
This page2020GM's 2020 Tahoe police guide.
Same wiring2015, 2016, 2017, 2018 and 2019One generation (K2XX). GM's police guides for 2015, 2016, 2018, 2019 and 2020 print the same harness colors.
Not this page2014 and older, 2021 and newerOther generations have their own pages.
Where are the fuse boxes and ground points on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Fuses and relaysUpfitter powerGM puts the four 30A upfitter relays and their fuses in the underhood fuse block, and 50A power outlet fuses in the left dash fuse block.
PoliceGM police provisionsGM's police harness is the approved place for added equipment.
Ground pointsCargo ground studsGM M10 ground studs in the cargo area. Never the battery negative post.
Our team has not yet checked the fuses on a vehicle.
Where is the OBD-II port on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
OBD II
Diagnostic portOBD-II port: under the driver dashPlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Common questions about 2020 Chevrolet Tahoe PPV / SSV and Suburban wiring
What wire is constant power on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Red/Violet at the BCM blue 27-pin plug, pin 4. Always hot, 20A. Meter it before you tap it.
What wire is ignition on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Violet/White at the police harness under the center dash (circuit 239/1939). Hot in run and crank. Meter it before you tap it.
Where is the reverse wire on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Blue/Brown (positive +) at the BCM brown 26-pin, pin 26. Hot in reverse. Meter it before you tap it.
Where is the brake wire on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
White/Blue (police harness) and Violet/White (BCM) (positive +) at the police harness (circuit 6311); BCM black 26-pin, pin 11. Hot with the brake applied. Meter it before you tap it.
Where is the parking brake wire on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Blue/Violet (negative -) at the BCM white 26-pin, pin 10. Grounds with the parking brake set. Meter it before you tap it.
Where is the vehicle speed signal on a 2020 Chevrolet Tahoe PPV / SSV and Suburban?
Green/Gray at the police harness (circuit 817); civilian: dash junction block gray 50-pin, pin 47. 4,000 pulses per mile. Meter it before you tap it.
Which years share wiring with the 2020 Chevrolet Tahoe PPV / SSV and Suburban?
2015, 2016, 2017, 2018 and 2019. One generation (K2XX).
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