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Wiring Diagrams

Complex factory diagrams redrawn as simple pictures — with pin numbers and wire colours.

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All diagrams for this car

HL120 Ω(in a module)120 Ω(in a module)Engine ECUABS ECUMeterBody ECUOBD2 portpin 6 · pin 14Multimeter, battery OFF:6 ↔ 14 ≈ 60 Ω1234
All CarsGeneral GuidesAll years

CAN Bus Basics — CAN-H, CAN-L and the 60 Ω Test

How car computers talk on two wires, and how to test the CAN bus with a multimeter in 2 minutes.

Battery12 VAlternatorVoltageregulatorrotor + stator(makes the power)Main fuseBIgnitionIG fuseIGSS = senses battery voltageBattery light (meter)L1234
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Alternator Charging Circuit (B, IG, S, L) — Battery Light Explained

How the alternator charges the battery, what terminals B, IG, S and L do, and how to test charging.

Battery12 VStarter motorSolenoidMThick battery cable → terminal 30 / B+IgnitionSTARTNeutral / clutchswitchStarterrelayto 50 / Sengine ground strap12345
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Starter Motor Circuit — How It Works & How to Test

Why the car only clicks or won't crank: battery cable, solenoid, relay and safety switch explained.

RelayBattery12 VSwitch / ECUCoil8685Fuse3087a87Load(fan, horn, lamp…)1234
All CarsGeneral GuidesAll years

Relay Pinout 30, 85, 86, 87, 87a — How a Car Relay Works

What each relay pin does, how to wire it and how to test a 4- or 5-pin relay.

Looking into the car's socket (front view)1234567891011121314151616 = Battery +12 V4, 5 = Ground6, 14 = CAN-H / CAN-L7, 15 = K-line / L-line2, 10 = J1850 busOthers = maker's own use
All CarsGeneral GuidesAll years

OBD2 Port Pinout — All 16 Pins Explained

Every pin of the OBD2 diagnostic socket: power, ground, CAN and K-line, with simple tests.