Discharge Headlight Control Unit - Mazda 6 Training Manual

Structre And Operation
1. The high voltage pulse (alternating current appro. 25,000 V) traveling from the discharge headlight control unit
is applied between both discharge headlight bulb terminals, energizing the enon gas in the bulb.
2. Based on the energizing of the enon gas, the temperature of the discharge headlight bulb interior increases,
vaporizing the mercury and discharging the arc.
3. By the mercury and discharging the arc, the temperature of the discharge headlight bulb interior increases
further, metallic iodide is vaporized and separated, and metallic atoms are discharged, producing light.
1 B+
2

Discharge headlight control unit

3 Terminal
4 Discharge headlight bulb
5 Xenon gas
End Of Sie
DISCHARGE HEADLIGHT CONTROL UNIT
Function
• Controls the amount of electrical current while the discharge headlight are on to maintain optimum brightness
together with lighting stability.
• The failure detection functions are as follows:
— Abnormal input detection function
— Abnormal output detection function
Structure And Operation
• Built into the headlight and installed on the headlight lower side.
• Switches the direct current from the battery to alternating current and optimally controls the current supply
output to the bulb.
1 Discharge headlight control unit
T–16
EXTERIOR LIGHTING SYSTEM
6 Metallic atoms
7 Metallic iodide
8 Mercury
9 Light
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A6E811201052T05
A6E8112T121