Which wires give constant, ignition and ground on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
On a 2027 Chevrolet Tahoe PPV / SSV and Suburban, take constant power from the Red/Violet wire at the console harness between the front seats (circuit 842), ignition from the Violet/White wire at the console harness (circuit 4939), and ground to the Black wire at the console harness (circuit 7150, ground G300). Meter every wire first.
Meter every wire before you tap it. Colors change with trim and build date.
OBD-II port:Under the driver dashBest power spot:GM console harnessSystem voltage:12VIgnition type:Keyless start (SSV)
Where do I get constant, ignition and ground on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
Take constant, ignition and ground from the same area. Police and special service Tahoes carry two GM police harnesses, one between the front seats and one in the cargo area.
Option 1 Police harness
Console harness (CONSOL)
GM police harness coiled between the front seats, on PPV (9C1) and SSV (5W4) Tahoes.
Constant
Red/Violet
Console harness between the front seats (circuit 842)Battery feed. GM's chart says 50A, but GM's guide text lists 100A for this circuit; check the fuse.
Ignition
Violet/White
Console harness (circuit 4939)Run/crank ignition. GM's UI Bulletin 183 covers 2021 and newer. GM's recommended feed for added equipment.
Console harness (circuit 2801)Retained accessory power. GM warns it drops when a front door opens or the start button is pressed; do not use it for GPS or cameras.
Brown/Yellow (820) brake, Yellow/Black (5813) park, Green/Gray (817) speed and Blue/Brown (8917) driver door are in the same harness.
Cargo harness (circuit 4939)Run/crank ignition, same circuit as the console harness.
Ground
Black
Cargo harness (circuit 7350, ground G409)Ground.
Four customer relays sit in junction block X51AX above the brake pedal.
Power wires from GM's 2027 Tahoe 9C1 PPV and 5W4 SSV spec guide upfit wiring tables (OEM).
Where are the turn signal, reverse and light wires on a 2027 Chevrolet Tahoe PPV / SSV and Suburban for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Blue/White (front and rear)
Lighting control module; rear body lamp plug pin 5 (circuit 1334), front headlamp pin 6 (1314)Flashes with the left signal. Carried from GM's 2026 manual; no 2027 manual is posted yet. Meter it.
Right turnPositive +Not yet checked
Blue/Violet (rear)
Green/Violet (front)
Lighting control module; rear body lamp plug pin 5 (circuit 1335), front headlamp pin 6 (1315)Flashes with the right signal. Carried from GM's 2026 manual; no 2027 manual is posted yet. Meter it.
Park lightPositive +Not yet checked
Brown/Blue (left rear)
Brown/Gray (right rear)
Green/Gray (switch, BCM X2 pin 20)
Lighting control module to the rear body lamps (circuits 6993 and 6995)Rear park lamp outputs. Front park lamps are White/Yellow (left) and Blue/Green (right). Carried from GM's 2026 manual; no 2027 manual is posted yet. Meter it.
HeadlightNegative -Not yet checked
White/Violet (switch on)
BCM plug X2, pin 19 (circuit 103)Headlamp switch on signal. For surveillance mode, ground White/Violet (circuit 6821) in the console harness. Carried from GM's 2026 manual; no 2027 manual is posted yet. Meter it.
ReversePositive +Not yet checked
Green/White
Backup lamp circuit 24, at the inside mirror plug pin 1Hot in reverse. Carried from GM's 2026 manual; no 2027 manual is posted yet. Meter it.
Dome lightPolarity: meter itNot yet checked
Gray
BCM plug X2, pin 1 (circuit 157)Interior lamp control. Carried from GM's 2026 manual; no 2027 manual is posted yet. Meter it.
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 2027 Chevrolet Tahoe PPV / SSV and Suburban for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Brown/Yellow
Console and cargo harnesses (circuit 820)Brakes applied, from the center high brake light circuit.
In parkPositive +Not yet checked
Yellow/Black
Police harness (circuit 5813), fuse F34DR 5APark enable from the trans-in-park relay.
Vehicle speedAC signalNot yet checked
Green/Gray
Console and cargo harnesses (circuit 817)4,000 pulses per mile, from the brake module.
Driver doorPolarity: meter itNot yet checked
Blue/Brown
Console and cargo harnesses (circuit 8917)Driver door ajar.
Not a tap pointGM bulletins PIT5989A and C (2021 to 2025): lighting modules spliced onto CAN bus 1 caused power steering and no-crank faults, and GM sends the vehicle back to the upfitter.
Sources: GM's Suburban / Tahoe electrical body builder manuals 2022 to 2026 (turn, park, headlight, reverse, dome), GM's 2026 Tahoe 9C1 spec guide wiring chart (OEM), GM UI Bulletin 183 (2021 and newer), GM's 2021, 2024 and 2025 guide text, GM's 2027 Tahoe 9C1 PPV and 5W4 SSV spec guides (OEM), and GM bulletins PIT5989A and C. Lock and parking brake wires were not found for this generation.
Where are the fuse boxes and ground points on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
Fuses and relaysUpfitter powerGM puts four customer relays in junction block X51AX above the brake pedal, fused F162 (25A), F163 (20A), F166 (20A) and F167 (25A).
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 2027 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.
Which years share wiring with the 2027 Chevrolet Tahoe PPV / SSV and Suburban?
This page2027GM's 2027 Tahoe 9C1 and 5W4 guides.
Same wiring2021, 2022, 2023, 2024, 2025 and 2026One generation (T1). GM's 2021, 2024 and 2025 guides list the same police harness circuits as the 2026 color chart, and GM's 2027 guide prints the same colors.
Not this page2020 and olderOlder Tahoes are different generations with their own pages.
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This page covers the 2027 Chevrolet Tahoe PPV and SSV (police and special service), and government Tahoes and Suburbans.
Every police harness color here comes from GM's own 2027 Tahoe 9C1 PPV and 5W4 SSV spec guides (upfit wiring tables, SEO 6J1). The colors match GM's 2026 chart. Our own team has not yet metered these on a 2027 vehicle, and each row says so.
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.
Common questions about 2027 Chevrolet Tahoe PPV / SSV and Suburban wiring
What wire is constant power on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
Red/Violet at the console harness between the front seats (circuit 842). Battery feed. Meter it before you tap it.
What wire is ignition on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
Violet/White at the console harness (circuit 4939). Run/crank ignition. Meter it before you tap it.
Where is the reverse wire on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
Green/White (positive +) at the backup lamp circuit 24, at the inside mirror plug pin 1. Hot in reverse. Meter it before you tap it.
Where is the brake wire on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
Brown/Yellow (positive +) at the console and cargo harnesses (circuit 820). Brakes applied, from the center high brake light circuit. Meter it before you tap it.
Where is the vehicle speed signal on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
Green/Gray at the console and cargo harnesses (circuit 817). 4,000 pulses per mile, from the brake module. Meter it before you tap it.
Where is the CAN bus on a 2027 Chevrolet Tahoe PPV / SSV and Suburban?
The wire color is not published. GM bulletins PIT5989A and C (2021 to 2025): lighting modules spliced onto CAN bus 1 caused power steering and no-crank faults, and GM sends the vehicle back to the upfitter.
Which years share wiring with the 2027 Chevrolet Tahoe PPV / SSV and Suburban?
2021, 2022, 2023, 2024, 2025 and 2026. One generation (T1).
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