Mercedes-Benz ML320. Manual — part 223

Function prerequisites:



Circuit 15 ON

Function



The headlamp cleaning system is switched on by pressing the SRA [HCS] switch (S4/1) .



The corresponding input of the Extended Activity Module (EAM) (N10/1) , which receives the input
from the switch, sends the signal to relay 5 (F2k5) .



The relay switches circuit 30 , for a duty cycle of approx. 1 second, through to the HCS pump (M5/2) .



The HCS pump (M5/2) builds up pressure in the washing water line.



The water pressure acts against the return springs of the telescopic nozzles.



The telescopic nozzles extend and spray washing water onto the headlamp glass.



After the duty cycle, the pressure in the washing water line drops again and the telescopic nozzles move
back to their starting position due to spring load.

Pressing the SRA [HCS] switch (S4/1) again during an ongoing headlamp cleaning cycle has no effect.

A further cleaning cycle can only be initiated after the previous cycle has ended.

TABLE OF CONTENTS, FUNCTION DESCRIPTION FOR HEADLAMP CLEANING SYSTEM (HCS) - GF82.15-P-0998GHZ

MODEL 163 as of 01.09.01 with CODE (600a) headlamp cleaning system

FUNCTION OF HEADLAMP CLEANING SYSTEM TELESCOPIC NOZZLES - GF82.15-P-2100-04GH

After the HCS pump (M5/2) has started to operate, pressure builds up in the washing water line for approx. 1

Headlamp cleaning system (HCS),
location of components

GF82.15-P-0002-
03GH

Telescopic nozzles for headlamp
cleaning system,
location/task/design/function

GF82.15-P-2100GH

Extended Activity Module,
location/task/design

GF54.21-P-4107GK

Headlamp cleaning system
(HCS), function

GF82.15-P-0002GH

Headlamp cleaning system
(HCS), location of components

GF82.15-P-0002-
03GH

Survey of system components
for headlamp cleaning system
(HCS), location/task/design/
function

GF82.15-P-9998GHZ

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

second. Driven by the water pressure, the nozzles first move telescopically into the cleaning position. Then as a
result of a further pressure rise, a valve at each telescopic nozzle opens and an exactly metered quantity of
washing water is sprayed onto the headlamp lenses.

Swirl chambers are provided at the tips of the telescoping sections and these ensure controlled propagation of
the water jet, even when traveling fast. After the cleaning process, the telescoping sections are retracted back
into the starting position with the aid of return springs.

TELESCOPIC NOZZLE FOR HEADLAMP CLEANING SYSTEM, LOCATION/TASK/ DESIGN/FUNCTION - GF82.15-P-
2100GH

MODEL 163 as of 01.09.01 with CODE (600a) headlamp cleaning system

Fig. 14: Identifying Telescopic Nozzle Location For Headlamp Cleaning System

Telescopic nozzle for
headlamp cleaning
system, location

The two telescopic
nozzles are both arranged
in the front bumper,
under the headlamps.

Telescopic nozzle for
headlamp cleaning
system, design

The telescopic nozzle is a
hydraulically extendable
telescoping section with
integrated return springs
and has no electrical
connection.

Telescopic nozzle for

Cleaning of headlamp

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

SURVEY OF SYSTEM COMPONENTS FOR HEADLAMP CLEANING SYSTEM (HCS),
LOCATION/TASK/DESIGN/FUNCTION - GF82.15-P-9998GHZ

MODEL 163 as of 01.9.01 with CODE (600a) headlamp cleaning system

INTERIOR LIGHTING (IL), LOCATION OF COMPONENTS - GF82.20-P-0002-01GH

Location of components

Fig. 15: Identifying Interior Lighting (IL) Components Location

headlamp cleaning
system, task

glass

Function of headlamp
cleaning system
telescopic nozzles

GF82.15-P-2100-04GH

Headlamp cleaning system (HCS),
location of components

GF82.15-P-0002-
03GH

Telescopic nozzle for headlamp
cleaning system,
location/task/design/function

GF82.15-P-2100GH

Table of contents, function description
for headlamp cleaning system (HCS)

GF82.15-P-
0998GHZ

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

INTERIOR LIGHTING (IL), FUNCTION - GF82.20-P-0002GH

MODEL 163

The interior lighting can be switched on in two ways: Manually with



the switches for the individual light

automatically by



opening the doors



Switching off the ignition



Locking the vehicle with the central locking feature



Following an accident

CONTENTS - FUNCTION DESCRIPTION OF INTERIOR LIGHTING (IL) - GF82.20-P-0998GH

MODEL 163

Switching on interior
lighting manually

GF82.20-P-2009GH

Switching on interior
lighting automatically

GF82.20-P-2010GH

Interior lighting, location of
components

GF82.20-P-0002-01GH

Function description,
interior lights

GF82.20-P-0002GH

Switching interior lights
on/off manually, function

GF82.20-P-2009GH

Switching interior lights
on/off automatically,
function

GF82.20-P-2010GH

Control of operating period
of interior lights, function

GF82.20-P-3001GH

Dimming interior lights,
function

GF82.20-P-3002GH

Actuating rear dome lamp,
function

GF82.20-P-4005GH

Actuating entrance/exit
lamps, function

as of 12.99

GF82.20-P-4004GH

Actuating footwell lamps,
function

as of 12.99

GF82.20-P-4008GH

Rotary tumbler

GF82.20-P-4105GH

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me