LIGHTING SYSTEM FAIL-SAFE CHART

LED HEADLIGHT SYSTEM (for LED Headlight)

The headlight leveling ECU assembly stops headlight operation when the following malfunctions are detected.

Condition	Description
Output Open Circuit Malfunction	Headlight illumination stops. Current condition is maintained until power supply is reinstated (headlight dimmer switch turned from off to head).
Short Circuit Malfunction Between Output Terminals	Headlight illumination stops. Current condition is maintained until power supply is reinstated (headlight dimmer switch turned from off to head).
Output Terminal - Ground Leak Malfunction	Headlight illumination stops. Current condition is maintained until power supply is reinstated (headlight dimmer switch turned from off to head).
Output Undervoltage Malfunction	When output undervoltage occurs, headlight illumination stops. Current condition is maintained until power supply is reinstated (headlight dimmer switch turned from off to head).
Output Overvoltage Malfunction	When output overvoltage occurs, headlight illumination stops. Current condition is maintained until power supply is reinstated (headlight dimmer switch turned from off to head).
Input Overvoltage Malfunction	When input overvoltage occurs (20 +/-3 V or higher), headlight illumination stops. Headlight illumination restarts once voltage returns to operating voltage range (10 to 16 V).
Input Undervoltage Malfunction	When input undervoltage occurs (below 7 V), headlight illumination stops. Headlight illumination restarts once voltage returns to operating voltage range (10 to 16 V).