Headlamp cleaning system, function - GF82.15-P-3000FQ

MODEL 218 

Function requirements, general 

• Low beam ON
• "Engine running" or "drive train operational" signal on

The low beams can be switched on by the auto on/off headlamps 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 itself corresponding to the pending request. The CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) sends the "Engine running" or "Drivetrain operational" signal over the chassis CAN (CAN E) (up to 28.2.13) or chassis CAN 1 (CAN E1) (as of 1.3.13) to the front SAM control unit.

Headlamp cleaning system, general 

The headlamp cleaning system cleans cover plates for the headlamps using a high pressure water spray.

Function sequence for headlamp cleaning system 

If the low beams are switched on and the windshield washer system is activated for the tenth time, the cover plates for the headlamps 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 (up to 28.2.13) or chassis CAN 1 (as of 1.3.13) to the front SAM control unit. The front SAM control unit then actuates the headlamp cleaning system pump (M5/2). The telescopic nozzles are extended and the washer fluid cleans the cover plates of the headlamps. After ten more wash requests, 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 once the ten wash requests have been reached or by manually switching off circuit 15. The status of circuit 15 is sent by the electronic ignition lock control unit (N73) over the interior CAN (CAN B) to the front SAM control unit.