AUTONATOMY · ADVANCED ELECTRICAL · LIGHTING SYSTEMS

Headlamp & Parking Lamp Lab

Lesson 2 · Operate the lighting controls, introduce a fault, and use simulated measurements to diagnose the circuit.

1 · Operate the system

This simplified model uses separate headlamp and parking-lamp feeds. Real vehicles may use modules, relays, LEDs, shared grounds, and different fail-safe strategies.

LEFT HEADLAMP
OFF
RIGHT HEADLAMP
OFF
LEFT PARKING
OFF
RIGHT PARKING
OFF

2 · Test the circuit

Simulated DC voltage
0.0 V
Left headlamp circuit current
0.00 A
Approximate educational model using a nominal 12 V source and a fixed equivalent lamp resistance.

3 · The Challenger

With low beams requested, the left headlamp is dark, the right headlamp works, and the left headlamp feed measures 12 V. What should you test next?