Chevrolet Sonic 2015–2016 & 2018–2020 Wiring Diagram Manual – 1.4L Turbo / 1.8L Electrical System, ECM, BCM, ABS, GMLAN & Full OEM Circuit Schematics

Overview

This Chevrolet Sonic electrical wiring manual package provides detailed circuit schematics for professional diagnostics, electrical repair, module and sensor testing, harness tracing, connector troubleshooting and workshop service. Coverage includes major powertrain, chassis, body, communication, HVAC, lighting, safety and convenience systems across five verified Sonic model years.

The diagrams identify modules, connectors, grounds, splices, relays, fuses, sensors and circuit interconnections. The manuals specifically document high- and low-speed GMLAN communication, including BCM and other module network connections.

Vehicle Coverage

• 2015 Chevrolet Sonic LT — 1.8L
  • 86 pages
  • Manual also contains dedicated 1.4L VIN B and 1.8L VIN G circuit sections.
• 2016 Chevrolet Sonic LS — 1.8L
  • 86 pages
  • Internal YMMS confirms 2016 Sonic LS 1.8L; the manual also begins dedicated 1.4L VIN B circuit coverage.
• 2018 Chevrolet Sonic LT — 1.8L
  • 104 pages
  • Includes separate 1.4L and 1.8L electrical circuit sections.
• 2019 Chevrolet Sonic Premier — 1.4L
  • 83 pages
• 2020 Chevrolet Sonic Premier — 1.4L
  • 83 pages

Engine circuit coverage: 1.4L Turbo and 1.8L
Total package: 5 PDF manuals / 442 pages
Approx. total file size: 30 MB
Format: PDF
Language: English

Technical Highlights

• 1.4L Turbo and 1.8L engine management circuits
• Engine Control Module (ECM)
• Body Control Module (BCM)
• Electronic Brake Control Module / ABS
• High-Speed GMLAN
• Low-Speed GMLAN
• Computer data lines and module communications
• Power distribution and fuse/relay circuits
• Ground distribution
• Manual HVAC / A/C and cooling-fan circuits
• Starting and charging
• Automatic transmission circuits
• Cruise control
• Headlights and exterior lighting
• Interior lighting and dimming
• Door locks and anti-theft
• Wiper and washer
• Instrument cluster
• Radio / audio and vehicle information systems
• Supplemental restraint / airbag circuits
• Power windows, mirrors and related body circuits
• Defogger
• Horn
• Trunk / rear compartment circuits

The BCM diagrams integrate lighting, wipers, anti-theft, door locks, power distribution and both high-speed and low-speed GMLAN communication.

Table of Content

• Air Conditioning
  • 1.4L Manual A/C circuits
  • 1.8L Manual A/C circuits
  • HVAC control module
  • Blower motor and resistor
  • A/C compressor clutch
  • Refrigerant pressure sensor
  • Evaporator temperature sensor
  • Ambient temperature sensor
  • Cooling fan control
• Anti-Lock Brakes
  • ABS / EBCM circuits
  • Wheel-speed sensor circuits
  • High-speed GMLAN communication
  • Brake and traction-control signals
• Anti-Theft & Door Locks
  • Anti-theft circuits
  • Door-lock controls
  • Door-ajar circuits
  • Remote-function circuits
  • Security indicator
  • Child-security locking
• Body Control Modules
  • BCM power and grounds
  • Lighting control inputs
  • Door and security functions
  • Accessory/RAP functions
  • High-speed GMLAN
  • Low-speed GMLAN
  • Interconnected body systems
• Computer Data Lines
  • High-speed GMLAN
  • Low-speed GMLAN
  • Module serial-data connections
  • ECM / BCM / ABS communications
• Cruise Control
  • Steering-wheel controls
  • Brake inputs
  • ECM cruise-control interface
  • Automatic-transmission interface
• Defogger
  • Rear-window defogger
  • BCM control
  • Relay circuits
• Engine Performance
  • 1.4L Turbo engine controls
  • 1.8L engine controls
  • Engine Control Module
  • Fuel injection
  • Ignition
  • Engine sensors
  • Intake and airflow controls
  • Cooling system controls
  • EVAP system
  • Turbocharger control circuits
  • Engine-control relays and power supplies
• Exterior Lights
  • Exterior lamp circuits
  • Turn signals
  • Park lamps
  • Backup lamps
  • BCM lighting controls
• Ground Distribution
  • Chassis grounds
  • Engine compartment grounds
  • Module grounds
• Headlights
  • Headlamp circuits
  • High-beam control
  • Headlamp switch
  • BCM interface
• Horns
  • Horn relay
  • BCM horn control
• Instrument Cluster
  • Cluster power and grounds
  • Indicator circuits
  • Serial-data communication
• Interior Lights
  • Interior lamps
  • Dimming controls
  • Courtesy-light circuits
  • BCM lighting control
• Power Distribution
  • Battery feeds
  • Underhood fuse block
  • Instrument-panel fuse circuits
  • Relays and module feeds
• Radio / Audio & Information
  • Radio and audio circuits
  • Steering-wheel audio controls
  • Information/display circuits
  • Communication interfaces
• Starting & Charging
  • Charging circuit
  • Battery-current sensor
  • Starter circuit
  • Starter relay
  • ECM starting control
  • Manual/automatic transmission start inputs
• Supplemental Restraints
  • Airbag circuits
  • Restraint control components
  • Seat-belt circuits
  • Passenger detection/indicator circuits
• Transmission
  • Automatic transmission assembly
  • Transmission control circuits
  • Input/output speed sensors
  • Shift controls
  • Solenoid circuits
  • ECM/TCM communication
  • Shift interlock
• Trunk / Rear Compartment
  • Trunk release
  • Latch and relay circuits
  • BCM interface
• Wiper / Washer
  • Front windshield wiper
  • Washer circuits
  • Wiper speed controls
  • Rear wiper/washer where equipped

The manuals explicitly show starting/charging integration with the ECM, GMLAN and automatic/manual transmission circuits.