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EXL-72 < DTC/CIRCUIT DIAGNOSIS > [XENON TYPE] XENON HEADLAMP XENON HEADLAMP Description INFOID:0000000005244736 OUTLINE • The lamp light source is by the arch discharge by applying high voltage into the xenon gas-filled bulb instead of the halogen bulb filament. • Sight becomes more natural and brighter because the amount of light are gained adequately and the color of light is sunshine-like white. • The xenon bulb drops the amount of light, repeats blinking, and illuminates in red if the bulb reaches the ser- vice life. ILLUMINATION PRINCIPLE 1. Discharging starts in high voltage pulse between bulb elec- 2. Xenon gas is activated by current between electrodes. Pale light 3. The luminous tube (bulb) temperature elevates. Evaporated NOTE: after the headlamp turned ON until the xenon bulb becomes sta- • Illumination time lag may occur between right and left. This is not malfunction. PRECAUTIONS FOR TROUBLE DIAGNOSIS Representative malfunction examples are, "Light does not turn ON", "Light blinks", and "Brightness is inade- WARNING: • Never touch the harness, HID control unit, the inside and metal part of lamp when turning the head- lamp ON or operating the light switch. • Never work with wet hands. CAUTION: • Never perform HID control unit circuit diagnosis with a circuit tester or an equivalent. when checking ON/OFF status. • Disconnect the battery negative terminal before disconnecting the lamp socket connector or the har- ness connector. • Check for fusing of the fusible link(s), open around connector, short, disconnection if the symptom is caused by electric error. NOTE: vice life. Diagnosis Procedure INFOID:0000000005244737 1. CHECK XENON BULB Install the normal bulb to the applicable headlamp. Check that the xenon bulb is turned ON. Is the headlamp turned ON? YES >> Replace the xenon bulb. NO >> GO TO 2. 2. CHECK HID CONTROL UNIT Install the normal HID control unit to the applicable headlamp. Check that the lamp is turned ON. Is the headlamp turned ON? JPLIA0421GB |