Headlamp Cleaning System, Function - GF82.15-P-3000RD

MODEL 172.4 

with CODE 600 (Headlamp cleaning system) 

Function requirements, general 

• Low beam ON
• Engine running or drive train operational

The low beams can be switched on by the auto on/off driving lights function, the daytime running lights function or manually. The front SAM control unit with fuse and relay module (N10/1) generates the "Low beams ON" status corresponding to the pending request.

The CDI control unit (N3/9) (diesel engine) or the ME-SFI [ME] control unit (N3/10) (gasoline engine) sends the "Engine running" or the "Drivetrain operational" signal over the chassis CAN (CAN E) to the front SAM control unit.

Headlamp cleaning system, general 

The headlamp cleaning system uses a high pressure water spray to clean the cover plates for the left front lamp unit (E1) and the right front lamp unit (E2).

Function sequence for headlamp cleaning system 

If the low beams are switched on and the windshield washer system is activated for the tenth time, then the cover plates for the front lamp units are cleaned by the headlamp cleaning system. The steering column tube module control unit (N80) reads in the switch position of the combination switch (S4) directly and sends this over the chassis CAN to the front SAM control unit, which then actuates the headlamp cleaning system pump (M5/2). The telescopic nozzles are extended and the washer fluid cleans the cover plates on the front lamp units. Following another ten wash requests, the headlamp cleaning system pump is actuated again. The number of washing requests is recorded by a counter in the front SAM control unit. The counter is automatically reset when ten wash requests are reached or by manually switching off at circuit 15. The electronic ignition lock control unit (N73) sends the circuit 15 status over the interior CAN (CAN B) to the front SAM control unit.