Mercedes-Benz ML320. 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