Overview
This Chevrolet Express 2500 wiring diagram manual package provides complete electrical circuit schematics for the uploaded 2015–2016 and 2018–2020 Express 2500 manuals.
It is designed for professional diagnostics, electrical troubleshooting, module testing, wiring repair, connector tracing, fleet maintenance, van conversion wiring reference and workshop repair support.
The package covers core Express 2500 systems including manual A/C, rear A/C, auxiliary HVAC, ECM engine control, BCM body control, ABS, GMLAN data lines, power distribution, grounds, exterior lighting, interior lighting, navigation, radio, parking assist, transmission, starting/charging, supplemental restraints and wiper/washer wiring.
Vehicle Coverage
- Chevrolet Express 2500 2015 LT
- Engine: 6.0L
- Pages: 101
- Chevrolet Express 2500 2016 LS
- Engine: 6.0L
- Pages: 113
- Chevrolet Express 2500 2018 LT
- Engine: 4.3L
- Pages: 105
- Chevrolet Express 2500 2019 LT
- Engine: 6.0L
- Pages: 108
- Chevrolet Express 2500 2020 LT
- Engine: 6.0L
- Pages: 106
- Engine circuit coverage included:
- 2.8L VIN 1 Turbo Diesel where included
- 4.3L VIN P
- 4.8L VIN A / VIN F where included
- 6.0L VIN B / VIN G
- 6.6L VIN L Turbo Diesel where included
- Total package size:
- 533 pages
- Approx. total file size: 37.52 MB
- Format: PDF
- Language: English
Technical Highlights
- Complete Chevrolet Express 2500 electrical wiring coverage
- ECM / Engine Control Module wiring
- BCM / Body Control Module circuits
- ABS and brake control diagrams
- Low-speed and high-speed GMLAN data line circuits
- Manual A/C, rear A/C and auxiliary HVAC wiring
- Auxiliary fuel-fired coolant heater circuits where included
- Blower motor, blower resistor and A/C compressor wiring
- Cooling fan clutch and cooling fan control circuits
- Power distribution and fuse block diagrams
- Ground distribution circuits
- Exterior lamps, trailer tow, headlights and horn circuits
- Interior lights and instrument illumination wiring
- Navigation, rear view camera and parking assist wiring
- Power door locks, mirrors, seats and windows
- Shift interlock, starting, charging and transmission circuits
- 6-speed and 8-speed transmission wiring where included
- CNG / LPG / alternative fuel-related circuits where included
- Supplemental restraints, warning systems and wiper/washer circuits
Table of Content
- Air Conditioning
- Manual A/C circuit, cargo van
- Manual A/C circuit, passenger van
- Rear A/C circuit
- Rear A/C circuit provisions
- Front auxiliary HVAC control assembly
- Auxiliary HVAC mode door actuator
- Auxiliary air temperature door actuator
- Auxiliary blower motor and blower motor resistor
- Auxiliary blower motor low, medium and high speed relays
- Blower motor and blower motor resistor circuit
- HVAC control switch assembly
- Air temperature door actuator wiring
- A/C compressor clutch circuit
- A/C low side pressure switch
- Auxiliary fuel-fired coolant heater circuit where included
- Coolant heater control module wiring
- Coolant heater blower motor and fuel pump wiring
- Ambient air temperature sensor circuit
- Anti-Lock Brakes
- Anti-lock brakes circuit
- Anti-lock brakes circuit with JL4
- Anti-lock brakes circuit without JL4
- Electronic Brake Control Module wiring
- Brake pressure and brake position sensor links
- Wheel speed sensor wiring
- ABS power, ground and data communication
- Anti-Theft
- Forced entry circuit
- Pass-Key circuit
- Door lock and anti-theft links
- Hood ajar switch wiring
- Remote function actuator communication
- Security indicator and BCM anti-theft connections
- Body Control Modules
- Body Control Module circuit
- BCM power, ground and signal wiring
- Lighting, locks, HVAC and instrument cluster links
- Power distribution and ignition feed connections
- Wiper/washer and warning system links
- Trunk, tailgate and fuel door links
- GMLAN and serial data communication
- Computer Data Lines
- Computer data lines circuit
- Low-speed GMLAN serial data
- High-speed GMLAN serial data
- Data link connector wiring
- ECM, BCM, ABS, radio, instrument cluster and transmission communication
- Parking assist and rear body data links
- Cooling Fan
- Cooling fan circuit
- Cooling fan clutch circuit
- EV fan clutch fuse and relay wiring
- ECM cooling fan control links
- Engine coolant temperature sensor wiring
- Cruise Control
- Cruise control circuit
- Brake position sensor links
- Steering / control switch wiring
- ECM and GMLAN cruise control communication
- Defoggers
- Defoggers circuit
- Rear window defogger circuit
- Defogger switch wiring
- Heated mirror and rear defogger links where equipped
- Engine Performance
- 2.8L VIN 1 engine performance circuit
- 4.3L VIN P engine performance circuit
- 4.8L VIN A engine performance circuit
- 4.8L VIN F engine performance circuit
- 6.0L VIN B engine performance circuit
- 6.0L VIN G engine performance circuit
- 6.6L VIN L engine performance circuit
- ECM power, ground and relay wiring
- Fuel injector and ignition coil circuits
- Fuel pump and fuel pressure sensor wiring
- Throttle body and accelerator pedal circuits
- Camshaft and crankshaft sensor wiring
- Engine coolant temperature sensor circuit
- EVAP purge, leak detection and emissions wiring
- Oxygen sensor and diesel-related sensor circuits where included
- CNG / LPG fuel injector control module wiring where included
- Alternative fuel tank pressure and cut-off solenoid circuits where included
- A/C compressor and cooling fan control links
- High-speed GMLAN drivetrain communication
- Exterior Lights
- Backup lamps circuit
- Exterior lamps circuit
- Trailer tow circuit
- Stop lamp, park lamp and turn signal wiring
- Side marker, license lamp and rear lamp wiring
- BCM-controlled exterior lighting links
- Ground Distribution
- Ground distribution circuits
- Engine ground points
- Chassis ground points
- Instrument panel ground circuits
- HVAC, lighting, infotainment and module grounds
- Rear body, auxiliary HVAC and frame ground circuits
- Headlights
- Headlights circuit
- Low beam and high beam wiring
- Headlamp switch wiring
- BCM-controlled headlamp circuits
- Horns
- Horn circuit
- Horn relay and horn switch wiring
- BCM horn control links
- Instrument Cluster
- Instrument cluster circuit
- Driver information center wiring
- Engine coolant temperature gauge links
- Warning indicator wiring
- GMLAN communication circuits
- Interior Lights
- Courtesy lamps circuit
- Instrument illumination circuit
- Interior lamp dimming control
- Front and rear interior lighting links
- BCM-controlled lighting wiring
- Navigation / Camera / Parking Assist
- Navigation circuit
- Navigation circuit with UYS
- Navigation circuit without UYS
- Rear view camera circuit
- Rear view camera with UYS
- Rear view camera without UYS
- Parking assistant circuit
- Rear object sensor wiring
- Display, radio and camera communication links
- Power Distribution
- Power distribution circuits
- Underhood fuse block wiring
- Passenger compartment fuse block wiring
- Battery feed and ignition feed circuits
- Relay, fuse and module power supply diagrams
- ECM, BCM, HVAC, ABS, radio and transmission power feeds
- Power Door Locks
- Power door locks circuit
- Door latch and lock actuator wiring
- Lock / unlock switch circuits
- Remote function actuator links
- BCM door lock control wiring
- Power Mirrors
- Power mirrors circuit
- Electrochromic mirror circuit
- Electrochromic mirror with forward collision alert
- Electrochromic mirror without forward collision alert
- Heated mirror and defogger-related wiring
- Power Seats
- Power seats circuit
- Driver seat power wiring
- Passenger seat power wiring
- Seat adjustment and lumbar circuits where included
- Seat module power and ground wiring
- Power Windows
- Power windows circuit
- Window switch and motor wiring
- Door harness and BCM window control links
- Radio
- Radio circuit
- Radio circuit with UYS
- Radio circuit without UYS
- Speaker and antenna wiring
- Audio system power and ground circuits
- Infotainment and navigation interface links
- Shift Interlock
- Shift interlock circuit
- Brake signal wiring
- Shift lock control circuit
- Transmission and BCM interlock links
- Starting / Charging
- 2.8L VIN 1 charging circuit
- 2.8L VIN 1 starting circuit
- 4.3L VIN P charging circuit
- 4.3L VIN P starting circuit
- 4.8L VIN A charging circuit
- 4.8L VIN A starting circuit
- 4.8L VIN F charging circuit
- 6.0L VIN B charging circuit
- 6.0L VIN B starting circuit
- 6.0L VIN G charging circuit
- 6.0L VIN G starting circuit
- 6.6L VIN L charging circuit
- 6.6L VIN L starting circuit
- Starter relay, generator and battery feed wiring
- ECM start and charge control links
- Supplemental Restraints
- Supplemental restraints circuit
- Inflatable restraint sensing and diagnostic module wiring
- Driver and passenger airbag circuits
- Passenger airbag disable switch and indicator wiring
- Seat belt and restraint sensor wiring
- SRS diagnostic communication
- Transmission
- 6-speed transmission circuit
- 8-speed transmission circuit
- Transmission Control Module wiring
- Transmission range and park/neutral signal wiring
- Shift solenoid and transmission sensor circuits
- High-speed GMLAN drivetrain communication
- Trunk, Tailgate, Fuel Doors
- Access panel release circuit
- Rear door / rear body release wiring
- Fuel door and rear body system links where included
- BCM release control circuits
- Warning Systems
- Warning systems circuit
- Instrument cluster warning indicators
- Brake, restraint and system status warning links
- Driver information center warning circuits
- Wiper / Washer
- Wiper/washer circuit
- Wiper motor wiring
- Washer pump and switch circuits
- Wiper relay and BCM control links
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