Learn the language of an electrical schematic, follow a complete circuit from power to ground, and diagnose faults using evidence—not guesses. Every circuit and reading in this prototype is illustrative, not vehicle-specific service data.
Choose a lesson, read the principle, then mark it learned. Progress is saved in this browser.
A schematic shows electrical relationships, not necessarily the physical route or location of wiring. A wire running left on a page may run right in the actual vehicle.
Safety: Learn with the simulated 12 V lamp circuit here. For real vehicles, follow model-specific service information and safety procedures. Never assume a circuit is safe to probe; high-voltage and restraint circuits need special procedures.
Match each common schematic symbol to its job. These are simplified, generic symbols; OEM diagrams and conventions can vary.
Click any component in the Live diagram to see what it represents and what to check when diagnosing that section.
Operate the switch, tap a symbol or test point, and trace the path. This basic single-load circuit prepares you for relay and module diagrams later.
Select a schematic symbol or test point to inspect its role. Use the trace menu to highlight the supply path, return path or complete loop.
Simulated voltmeter readings relative to a known-good B−. Select a red lead point; the black lead stays at F (0 V).
6 Ω lamp is modeled as an ideal fixed resistor. A real incandescent lamp's resistance changes dramatically with filament temperature; these are instructional values, not OEM test specifications.
Measure resistance only with circuit power removed and the component isolated as specified by service information. Do not use a current-meter setting across a battery or circuit supply.
Study the measurements. Decide which section deserves the next inspection. The correct response identifies a supported circuit condition, not an automatic parts-replacement order.
An open ground can leave 12 V on both sides of an unlit lamp. Seeing supply voltage at the lamp is not proof that its return path works.
Answer all eight questions. Pass with at least seven correct. You can retry after reviewing the explanations.
Autonatomy · Introductory Wiring Diagrams
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