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DISCHARGE HEADLIGHT CONTROL UNIT FUNCTION

BHE091801052T04

• 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 unit 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 unit turns off the headlights for protection and to prevent partial operation.

• The discharge headlight control unit turns the headlights back on at resumption of normal operational voltage.

## Abnormal Output Detection Function

• If there is an abnormality in the output system (detects an open or GND short circuit in harness), the discharge headlight control unit turns off the headlights for protection and to prevent partial operation errors.

• If the discharge headlight control unit turns off the headlights due to an abnormality in the output system, the discharge headlight control unit will maintain them in the off condition until the light switch is turned again from off to on.