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

DISCHARGE HEADLIGHT STRUCTURAL VIEW

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DISCHARGE HEADLIGHT OPERATION

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.
.
1 Metallic atoms
2 Terminal
3 Metallic iodide
4 Light
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DISCHARGE HEADLIGHT CONTROL MODULE FUNCTION

• 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.
09–18–4
LIGHTING SYSTEMS
A
A A
6
1
4
2
4
3
DISCHARGE
HEADLIGHT BULB
DISCHARGE HEADLIGHT
CONTROL MODULE
SEC. A—A
7
B+
8
5
2
5 Mercury
6 Discharge headlight bulb
7 Xenon gas
8 Discharge headlight control module
E5U091851030N02
HEADLIGHT
E5U918ZS5103
E5U091851030N03
B3E0918T121
E5U091851030N04