Mercedes-Benz ML320. Manual — part 248

Function up to 31.8.01

The GPS/CTEL roof antenna (A2/49) is a combination antenna for telephone and GPS.

The CTEL and GPS roof antenna (A2/49) receives the GPS satellite signals. No GPS signals are transmitted
over this range of the antenna.

The CTEL and GPS roof antenna (A2/49) receives and transmits the GSM radio signals.

The radio signals for CTEL and GPS are transmitted to the CTEL and GPS antenna splitter (A2/57) via a
common antenna cable.

The CTEL and GPS roof antenna (A2/49) is an active antenna .

It is supplied with direct voltage via the antenna cable ( phantom feed ). The electronics in the antenna must
ensure that the



transmission signals of the cellular telephone are transmitted by the CTEL and GPS roof antenna
(A2/49)



the received signals of both antennas are made available to an antenna output.

The antenna is linked via a coaxial cable to the CTEL and GPS antenna splitter (A2/57) .

Function as of 01.09.01

The CTEL and GPS roof antenna (A2/49) is a new version of the combination antenna for CTEL and GPS.

It has an integrated antenna splitter and an antenna amplifier, which eliminates the need for the CTEL and
GPS antenna splitter (A2/57) . splitter

The CTEL and GPS roof antenna (A2/49) has connections for



Cellular telephone,



GPS navigation system and



GPS E-Call (

)

GPS/TELEPHONE ROOF ANTENNA, LOCATION/TASK/DESIGN/FUNCTION - GF82.70-P-4111A

MODELS 140, 210 up to 31.5.98 with CODE (348) TELE AID emergency call system

MODELS 129, 202, 208.3, 210 as of 6/198, 220 with CODE (347) TELE AID emergency call system (D2B)

MODEL 140 as of 1.1.98, 168, 202, 208.3, 210.0 as of 1.1.98, 210.2 with CODE (351) Auto pilot system
(APS)

MODELS 163,168, 208.3, 210 with CODE (353) Audio 30 APS

2001 Mercedes-Benz ML320

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

me

MODELS 163, 208.3, 210, 220 with CODE (352a) COMAND operating and display system with CODE
(353) Audio 30 APS with CODE (853) MB standard CTEL telephone with CODE (854) MB portable
CTEL telephone with CODE (855) TELE AID

MODEL 163 with CODE (522) Modular control system (MCS) Radio USA

Location shown on model 210

Fig. 81: Identifying Telephone And GPS Roof Antenna

The telephone antenna (A2/49a1) and the GPS antenna (A2/49a2) are integrated in an antenna housing.

GPS/telephone roof
antenna, location

Models 129, 140, 168,
202, 208.3, 210

GF82.70-P-4111-01A

Model 220

GF82.70-P-4111-01B

Model 163

GF82.70-P-4111-01GH

GPS/telephone roof
antenna, purpose

Receiving and amplifying
the global positioning
system (GPS) satellite
signals as well as
transmitting and receiving
the mobile radio signals
(GSM 900 MHz).

GPS/telephone roof
antenna, design

The GPS/telephone roof
antenna (A2/49) consists

2001 Mercedes-Benz ML320

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

me

MODULAR CONTROL SYSTEM (MCS), FUNCTION - GF82.85-P-0011GI

MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357)
Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE
(819) 6-disk CD changer in trunk with CODE (491) U.S. version

The following systems can be operated centrally with the aid of the radio and navigation unit (A2/56) :



Cassette deck



Radio



Single CD player and CD player with changer (optional)



Sound system (optional)



Navigation (optional)



Telephone (optional)

Fig. 82: Identifying Radio And Navigation Unit

of two components:



CTEL antenna
(A2/49a1)



GPS antenna
(A2/49a2)

Model 163 as of 01.09.01 GF82.70-P-4111-03GH

GPS/CTEL roof antenna,
function

Code 351 or code 353,
except models
129 /163 /220

GF82.70-P-4111-04A

Code 353 for model 163

GF82.70-P-4111-04D

Code 347 or 348 or 352
except models 168/163

GF82.70-P-4111-04B

Model 163 as of 01.09.01 GF82.70-P-4111-04GH

2001 Mercedes-Benz ML320

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

me

Fig. 83: MCS System Block Diagram

MCS system

The radio and navigation unit (A2/56) is the central component of the MCS system . It has a video-capable 5"
active matrix TFT display for indicating information such as control menus and map data for navigation.
Actuation is accomplished in operating modes NTSC (US standard) PAL (ECE standard). It is operated with
fixed function keys and a rotary knob, a joystick as well as with menu-guidance on the display.

The basic version of the radio and navigation unit (A2/56) is equipped with



a radio reception unit,



a compact cassette player and



a speed-dependent volume control.

Diagnostic interface

To read out actual values and DTC's of the MCS and components connected via the digital data bus ( D2B )
diagnosis with the hand-held tester is possible via a K-line.

MCS bus system

2001 Mercedes-Benz ML320

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

me