Mazda 2006 MX-5 - Discharge Headlight Control Module Function; Abnormal Input Detection Function; Discharge Headlight Operation; Discharge Headlight Structural View

LIGHTING SYSTEMS
09–18–4
DISCHARGE HEADLIGHT STRUCTURAL VIEW
E5U091851030N02
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DISCHARGE HEADLIGHT OPERATION
E5U091851030N03
1. A high voltage pulse (alternating current approx. 25,000 V) travelling from the discharge headlight control
module is applied between both discharge headlight bulb terminals, energizing the xenon gas in the bulb.
2. Due to the energizing of the xenon gas, the temperature of the discharge headlight bulb interior increases,
vaporizing the mercury and discharging an arc.
3. Due to the mercury and discharging of 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.
.
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DISCHARGE HEADLIGHT CONTROL MODULE FUNCTION
E5U091851030N04
• Controls the amount of electrical current while the discharge headlights 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
Abnormal Input Detection Function
• If the discharge headlight control module input voltage (9—16 V) fails to maintain operational voltage (except
for the drop in voltage immediately after the headlights are turned on), the discharge headlight control module
turns off the headlights for protection and to prevent partial operation.
• The discharge headlight control module turns the headlights back on at resumption of normal operational
voltage.
A
A
HEADLIGHT
DISCHARGE
HEADLIGHT BULB
DISCHARGE HEADLIGHT
CONTROL MODULE
SEC. A—A
A
E5U918ZS5103
B+
1
6
2
4
2
3
5
8
7
4
B3E0918T121
1 Metallic atoms
2 Terminal
3 Metallic iodide
4 Light
5Mercury
6 Discharge headlight bulb
7 Xenon gas
8 Discharge headlight control module