Mercedes-Benz ML320. Service manual - part 220

 

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Mercedes-Benz ML320. Service manual - part 220

 

 

HEADLAMP RANGE ADJUSTMENT (HRA), LOCATION OF COMPONENTS - GF82.10-P-0001-01GH 

Fig. 8: Identifying Headlamp Range Adjustment (HRA) Components 

HEADLAMP RANGE ADJUSTMENT (HRA), LOCATION OF COMPONENTS - GF82.10-P-0001-01GHA 

location/task/function

 

Table of contents, function 
description of digital data bus 
(D2B)

 

GF82.00-P-0999ZZ

 

2001 Mercedes-Benz ML320 

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

  

me 

 

Fig. 9: Identifying Headlamp Range Adjustment (HRA) Components 

HEADLAMP RANGE ADJUSTMENT (HRA), FUNCTION - GF82.10-P-0001GH 

MODELS 163.113 /136 /154 /172 /174 up to 31.8.01 with CODE (612b) Xenon headlamp unit with CODE 
(U47) Conversion package
  

Function  

The electrical headlamp range adjustment operates dynamically. Every change in the vehicle level is determined 
and signaled to the headlamp range adjustment control module (N71) by the rear axle sensor and the front axle 
sensor (A51, A52). The control module (N71) compares the vehicle level and the headlamp position. If 
necessary, the headlamp setting is corrected by the control module (N71) via the headlamp range adjustment 
motors (E1m1, E2m2). The headlamp position is only corrected if a modified vehicle level is signaled to the 
control module (N71) by the front and rear axle sensors (A51, A52) for a specific time span. 

Headlamp range adjustment control module (N71)  

The headlamp range adjustment control module (N71) processes the signals from the front and rear axle sensors 
(A51, A52) as well as the position of the headlamp range adjustment motors (E1m1, E2m1). After evaluating 
these signals, commands are sent to the headlamp range adjustment motors (E1m1, E2m1). 

Front and rear axle sensors (A51, A52)  

 

2001 Mercedes-Benz ML320 

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

  

me 

 

A sensor is fitted to the front axle and to the rear axle and the sensors pick up the instantaneous vehicle level at 
the control arm. These sensors (A51, A52) transmit the determined vehicle level to the control module (N71). 

Headlamp range adjustment motor (E1m1, E2m1)  

The position of the reflectors is signaled to the headlamp range adjustment control module (N71) by a 
potentiometer in the headlamp range adjustment motor. The motors (E1 m1, E2m1) receive a command from 
the control module (N71) for correcting the headlamp position. If the low beam is switched on and the key is in 
position 2, the motors are referenced. The reflectors are moved to the lowest position and then, depending on 
the vehicle level, moved to the correct position. 

HEADLAMP RANGE ADJUSTMENT (HRA), FUNCTION - GF82.10-P-0001GHA 

MODELS 163.113 /128 /154 /172 /174 as of 1.9.01, 163.157 with CODE (614) Bi-xenon headlamp unit  

Function  

The electrical headlamp range adjustment operates dynamically. Every change in the vehicle level is determined 
and signaled to the headlamp range adjustment control module (N71) by the rear axle sensor and the front axle 
sensor (A51, A52). The control module (N71) compares the vehicle level and the headlamp position. If 
necessary, the headlamp setting is corrected by the control module (N71) via the headlamp range adjustment 
motors (E1m1, E2m2). The headlamp position is only corrected if a modified vehicle level is signaled to the 
control module (N71) by the front and rear axle sensors (A51, A52) for a specific time span. 

Headlamp range adjustment control module (N71)  

The headlamp range adjustment control module (N71) processes the signals from the front and rear axle sensors 
(A51, A52) as well as the position of the headlamp range adjustment motors (E1m1, E2m1). After evaluating 
these signals, commands are sent to the headlamp range adjustment motors (E1m1, E2m1). 

Front and rear axle sensors (A51, A52)  

A sensor is fitted to the front axle and to the rear axle and the sensors pick up the instantaneous vehicle level at 
the control arm. These sensors (A51, A52) transmit the determined vehicle level to the control module (N71). 

Headlamp range adjustment motor (E1m1, E2m1)  

The position of the reflectors is signaled to the headlamp range adjustment control module (N71) by a 
potentiometer in the headlamp range adjustment motor. The motors (E1 m1, E2m1) receive a command from 
the control module (N71) for correcting the headlamp position. If the low beam is switched on and the key is in 
position 2, the motors are referenced. The reflectors are moved to the lowest position and then, depending on 
the vehicle level, moved to the correct position. 

 

Headlamp range control 
(HRC), location of 
components

 

GF82.10-P-0001-01GH

 

2001 Mercedes-Benz ML320 

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

  

me 

 

CONTENTS - FUNCTION DESCRIPTION OF EXTERIOR LIGHTING - GF82.10-P-0999A 

MODELS 129, 140, 163 up to 31.08.01, 202, 208, 210 with CODE (612b) xenon headlamp unit  

MODEL 163 as of 1.9.01 with CODE (614) Bi-xenon headlamp unit  

MODEL 202 with CODE (236a) Special light circuit for daytime running lamps  

 

Headlamp range control 
(HRC), location of 
components

 

GF82.10-P-0001-
01GHA

 

Exterior lights, function

Models 129, 140, 
202, 208, 210, with 
Code 612b lamp unit 
for Xenon headlamp

GF82.10-P-0003A

 

Electrical headlamp range adjustment 
(HRA), location of components

MODEL 208 with 
code 612b xenon 
headlamp unit

GF82.10-P-0001-
01A

 

 

Model 210 with code 
612b xenon 
headlamp lamp unit

GF82.10-P-0001-
01B

 

 

Model 129 with code 
612b xenon 
headlamp lamp unit

GF82.10-P-0001-
01C

 

 

Model 140 with code 
612b xenon 
headlamp lamp unit

GF82.10-P-0001-
01D

 

 

Model 202 with code 
612b xenon 
headlamp unit

GF82.10-P-0001-
01E

 

 

Model 163, up to 
31.08.01

GF82.10-P-0001-
01GH

 

 

Model 163 as of 
1.09.01

GF82.10-P-0001-
01GHA

 

Xenon headlamp (XENON), location of 
components

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

GF82.10-P-0002-
01A

 

 

Model 202 with code 
612b xenon 
headlamp unit

GF82.10-P-0002-
01B

 

Headlamp range adjustment, function

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

GF82.10-P-0001A

 

2001 Mercedes-Benz ML320 

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

  

me 

 

 

 

 

 

 

 

 

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