DISCHARGE HEADLIGHT CONTROL MODULE CONSTRUCTION/OPERATION
id091800103300
Construction
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Warning
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• Incorrect servicing of the discharge headlights could result in electrical shock. Before servicing the discharge headlights, always refer to the discharge headlight service warnings. (See Mazda6 Workshop Manual.)
• Built into the headlight and installed on the headlight lower side.
Operation
• Switches the direct current from the battery to alternating current (25,000 V) and optimally controls the current supply output to the bulb.
• 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:
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― Abnormal input detection function
― Abnormal output detection function
Abnormal input detection function
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• 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.
Abnormal output detection function
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• If there is an abnormality in the output system (detects an open or GND short circuit in harness), the discharge headlight control module turns off the headlights for protection and to prevent partial operation errors.
• Due to a malfunction in the output system, the discharge headlights remain in an off condition until the light switch is turned from OFF to ON again even though the headlights return to normal after they have been turned off.
