Mercedes-Benz ML320. Service manual - part 221

 

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Mercedes-Benz ML320. Service manual - part 221

 

 

XENON HEADLAMPS, FUNCTION - GF82.10-P-2007-01GH 

Function  

The combustion chamber of the xenon lamp is filled with xenon and a mixture of metal halide salts. This 
mixture is ignited by high voltage. The color of the light has a characteristic similar to daylight. 

When the low beam lamps are switched on the xenon headlamp control module (E1 n1, E2n1) activates the 
xenon headlamp control module and ignition module (E1n2, E2n2) via the control voltage within a few 
milliseconds. 

As a result of a high voltage surge (approx. 20 kV) of the ignition device, an arc forms between the electrodes, 
and the xenon lamp is ignited. 

When an arc of sufficient stability is detected, the control electronics of the xenon lamp control module (E1n1, 
E2n1) switches over to power-limiting mode. The electric power is regulated to 35 W. A voltage converter 
generates the voltage of approx. 85 V (~) necessary for the reliable function of the xenon lamp. For technical 
reasons the xenon lamp has a timed startup characteristic. After switching on, 50 % of the luminosity is reached 
within 1 to 2 seconds and full luminosity is reached after approx. 30 seconds.

 

 

Model 163, up to 
31.08.01

GF82.10-P-0001GH

 

 

Model 163 as of 
1.09.01

GF82.10-P-
0001GHA

 

Xenon headlamps, function

Model 163, up to 
31.08.01

GF82.10-P-2007-
01GH

 

 

Model 163 as of 
1.09.01

GF82.10-P-2007-
01GHA

 

Automatic driving light actuation, 
function

Model 163 as of 
01.09.01

GF82.10-P-3003GH

 

Daytime running light control, function Model 163 as of 

01.09.01

GF82.10-P-3005GH

 

Locator lighting, function

Model 163 as of 
01.09.01

GF80.20-P-2008GH

 

Headlamp cut-in, function

Model 163 as of 
01.09.01

GF80.20-P-2003GH

 

Daytime running lights, function

Model 202 with 
Code 236a special 
lamp circuit for 
daytime running 
lamps

GF82.10-P-2002A

 

Contents - Function description of 
exterior lighting, 
location/task/design/function

Models 129, 140, 
163, 202, 208, 210 
with code 612b 
xenon headlamp unit

GF82.10-P-9999B

 

2001 Mercedes-Benz ML320 

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

  

me 

 

XENON HEADLAMPS, FUNCTION - GF82.10-P-2007-01GHA

The lighting technology, known as bi-xenon 70 , is located in the outer headlamps. 

When the low beam lamps are switched on the xenon headlamp control module (E1 n1, E2n1) activates the 
xenon headlamp control module and ignition module (E1n2, E2n2) via the control voltage within a few 
milliseconds. 

A high-voltage surge from the ignition device ignites the xenon lamps, and in doing so an electric arc is formed 
between the electrodes. When an arc of sufficient stability is detected, the control electronics of the control 
module (E1 n1, E2n1) switches over to power-limiting mode. 

The light generated previously in a gas discharge lamp (D2S lamp) is not reflected in bi-xenon 70 headlamps, 
but instead it is sent directly through a lens optical system with a lens diameter of 70 mm. 

Using the mask (B), which is positioned between the gas discharge lamp and the lens optical system, the beam 
of light is partially masked for the low beam so that oncoming traffic is not blinded. 

For the high beam, the mask (B) is electro-mechanically folded to the side using the solenoid (M). 

 If the solenoid (M) should fail or a supply line breaks, the mask (B) remains mechanically held in the low 

beam position, always between the gas discharge lamp and the lens optical system. 

In order to make the extremely bright light more acceptable to other road users, the lens aperture area with its 
dotted characteristic is optically enlarged. 

This is possible on account of the specially formed areas which surround the lens. In addition, the light can pass 
through a number of chrome-plated strips from the rear. A portion of the diffused light is intercepted by the 
lower section of the surface area and reflected to the upper section of the chrome-plated longitudinal strips. 

  

For technical reasons the xenon lamp has a timed startup characteristic. After switch on, 50 % of the luminosity 
is reached within 1 to 2 seconds and full luminosity is achieved after another approx. 30 seconds. 

XENON HEADLAMP, LOCATION/DESIGN/FUNCTION - GF82.10-P-2007GH 

MODELS 163.113 /136 /154 /172 up to 31.08.01 with CODE (612b) xenon headlamp unit with CODE 
(U47) conversion package
  

MODELS 163.174 up to 31.08.01, 163.113 /128 /136 /154 /172 as of 01.09.01  

Design:  

 From model year 2002 (as of 1.9.01) the xenon headlamps are installed as standard. 

 

2001 Mercedes-Benz ML320 

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

  

me 

 

Fig. 10: Identifying Xenon Headlamp Components 

XENON HEADLAMP, LOCATION/DESIGN/FUNCTION - GF82.10-P-2007GHA 

MODELS 163.113 /128 /154 as of 1.9.01, 163.157, 163.172 /174 as of 1.9.01 with CODE (614) Bi-xenon 
headlamp unit
  

Design:  

 

Xenon headlamps, 
function

Models 163.113, 
163.136, 163.154, 
163.172, 163.174 up to 
31.08.01

GF82.10-P-2007-01GH

 

2001 Mercedes-Benz ML320 

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

  

me 

 

Fig. 11: Identifying Xenon Headlamp Components Location/Design 

AUTOMATIC DRIVING LIGHT ACTUATION, FUNCTION - GF82.10-P-3003GH 

MODEL 163 as of 01.09.01  

The Automatic Driving Light Actuation automatically switches on the driving lights (side lamps, low beams 
and license plate lamps), depending on the exterior lighting conditions (rain, snow, dusk and darkness). 

Function prerequisites:  

Exterior lamp switch in "AUTO" position  

Circuit 15 "ON"  

The sun sensor (B32) signals "Darkness" or the rain sensor (B38) signals "Rain"  

Basic prerequisites for automatic driving light actuation are:  

diminishing daylight intensity at dusk  

darkness (tunnel, underground garage, ...)  

rain or snowfall and  

failure of rain/sun sensor ("Darkness" is signaled continuously) 

 

Xenon headlamps, 
function

 

GF82.10-P-2007-
01GHA

 

2001 Mercedes-Benz ML320 

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

  

me 

 

 

 

 

 

 

 

 

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