Mercedes-Benz ML320. Service 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