Headlamp Washers

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The headlamp washers are only active when the headlamps and ignition are switched on. If the washer reservoir fluid level becomes low, the instrument cluster sends a message, via the medium speed CAN bus, to the CJB, which suspends headlamp wash operation to preserve washer fluid in the reservoir.

With the ignition and lights on, headlamp wash is activated on the first operation of the windshield washer switch.

The CJB monitors the operation of the washer switch and maintains a counter to restrict headlamp washer operation to every fourth operation of the washer switch in conjunction with a 10-minute timer. The timer prevents a second operation of the headlamp washers within a 10-minute period. Should the washer switch be activated for more than 4 programmed wipe requests during the 10-minute period, the headlamp washer will remain disabled. Only on the next consecutive programmed wipe request, after the 10-minute timer has expired, will the headlamp washers be enabled. The counter and timer are reset when the ignition is set in the off mode or the light switch is turned from OFF back to ON within the same ignition cycle.

When headlamp wash is active, the CJB energizes the washer pump for 3 seconds.