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High-resolution, full-colour interactive wiring schematics with ECU connector pinouts, component locations, and circuit logic — for every make and model in our database.
Why Our Wiring Diagrams Are Different
Generic PDF diagrams cost technicians hours. Our interactive schematics are built for real-world fault-finding.
Full-Colour Interactive Schematics
Navigate complex circuits with colour-coded wiring paths. Click any component to jump to its circuit.
ECU & Connector Pinouts
Every ECU connector mapped with pin numbers, wire colours, and expected voltage or resistance values.
CAN Bus & Network Diagrams
Complete topological views of CAN-H/CAN-L networks, gateway modules, and module communication paths.
Circuit Test Values
Known-good voltage, resistance, and current values at each test point — eliminating guesswork from fault diagnosis.
ADAS Sensor Wiring
Dedicated schematics for radar, camera, LiDAR, and ultrasonic sensor circuits with calibration reference notes.
Print-to-Bay Export
Export any schematic as a clean PDF to take to the vehicle bay without needing a second device.
Every Electrical System Covered
From basic lighting to high-voltage EV systems — our wiring database covers every circuit on every major vehicle.
Engine Management
ECU wiring, fuel injectors, ignition coils, MAF, MAP, O2 sensors and throttle body connections.
ABS & Braking
ABS pump, wheel speed sensors, hydraulic unit and ESC system wiring for every axle configuration.
Airbag & SRS
Airbag control module, crash sensors, seatbelt pre-tensioners and clock spring wiring.
HVAC & Climate
Heater matrix, evaporator, blower motor, compressor clutch and dual-zone climate control circuits.
Body & Lighting
Body control module, exterior/interior lighting, power windows, central locking and keyless entry.
CAN Bus & Networking
Full network topology diagrams showing all modules, gateway locations and bus termination points.
ADAS & Safety
Adaptive cruise, lane departure, autonomous emergency braking, camera and radar system wiring.
EV & Hybrid HV
High-voltage battery management, inverter, DC-DC converter and charging circuit diagrams with safety warnings.
Wiring Diagram FAQs
Yes. All wiring diagrams from Haynes Pro and Mitchell1 are delivered in full colour, with each wire colour matching its physical colour to make tracing circuits intuitive and fast.
Yes. Component locator diagrams show the exact physical location on the vehicle with reference photographs, so you know exactly where to access the connector before you lift the bonnet.
We provide wiring diagrams for the vast majority of European and global vehicles from 1990 to present. Coverage includes all major makes: BMW, VW, Ford, Toyota, Mercedes, Renault, Peugeot, Honda, and 140+ more.
Yes. High-voltage circuit diagrams for BEV and hybrid systems are included, with clear safety warnings and isolation procedures for working on live HV components.
Yes. Hover over any ECU connector in the diagram to see expected voltage, signal type and ground values for every pin — speeding up multimeter-based diagnostics significantly.
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Full-colour interactive wiring diagrams included in every Auto Fix Data plan. Try free for 7 days.
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