Mercedes-Benz ML320. Manual — part 271

(A2/56)

B1010

Radio and
navigation unit
(A2/56) switches off
due to undervoltage

AD82.61-P-6001-
01A

B1011

Radio and
navigation unit
(A2/56) switches off
due to overvoltage

AD82.61-P-6001-
01A

B1088

Only on model 208,
210:
Malfunction in CAN
connection between
instrument cluster
(A1) and radio and
navigation unit
(A2/56)

The radio and navigation unit

(A2/56) is connected to the
instrument cluster (A1) via a separate
CAN bus.
Read out instrument cluster (A1)
DTC memory

CAN line between
A1 and A2/56

B1734

Model 163:
Wheel speed signal
from CAN bus
adapter missing
Model 168:
Signal from left rear
wheel speed sensor
(L6/3) missing
Model 170:
Signal from left front
wheel speed sensor
(L6/1) missing
Models 208, 210:
Signal from right
front wheel speed
sensor (L6/2)
missing

The wheel speed signals are passed

to the radio and navigation unit
(A2/56) via a separate line and not
directly on CAN.
See also: Chassis Diagnosis Manual,
index 9 or index 10: ?
Index 10.4 ESP (Model 163)
Index 10.3 ESP (Model 168)
Index 10.2 ESP (Model 208, 210)
Index 10.5 ESP (Model 208)

AD82.61-P-6001-
03A
AD42.45-P-1002AZ

AD42.45-P-
1002GCZ
AD42.45-P-1000AZ
See STAR
DIAGNOSIS

B1738

Models 168, 208.4:
GPS antenna
(A2/49a2) or lead
defective
Models 170, 208.3:
Rear GPS antenna
(A2/23a2) or lead
defective

AD82.61-P-6001-
05A

Model 163:
Telephone and GPS
roof antenna (A2/49)
or telephone and

The GPS and telephone radio

signals are transmitted between A2/49
and A2/57 via a common antenna
cable.

AD82.61-P-6001-
05B

2001 Mercedes-Benz ML320

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

me

AUDIO 30 APS DIAGNOSIS, TROUBLESHOOTING - AD82.61-P-5001A

MODEL 163,168,170, 208, 210 with CODE (353) Audio 30 APS

GPS antenna
splitter (A2/57) or
lead defective

B1763

Excessive
temperature or
reading error of CD
drive of radio and
navigation unit
(A2/56)

Remove CD-ROM
from drive and check
for contamination
and damage. A2/56

B1765

Gyrosensor defective

A2/56

N1111
N1112
N1113
N1114
N1115
N1116
N1117
N1118

Fiber optic cable
defective, Individual
D2B units defective
or power supply for
individual D2B units

See also: ?
Information/Communication Diagnosis
Manual Index 13.1 Digital data bus
(D2B)

Model 168, 170,
208, 210
AD82.00-P-4000A

N1140

Only on model 208,
210:
DTC in CAN
connection between
instrument cluster
(A1) and radio and
navigation unit
(A2/56)

The radio and navigation unit

(A2/56) is connected to the
instrument cluster (A1) via a separate
CAN bus.
DTC memory for instrument cluster
(A1)

CAN line between
A1 and A2/56

N1141

Nominal-actual
configuration of D2B
ring varies

See also: ?
Information/Communication Diagnosis
Manual Index 13.1 Digital data bus
(D2B)

Reconfigure system
AD82.00-P-4000A

N1250

CD changer
Excess temperature

Lower temperature
inside vehicle

N1251

CD changer
CD reading error

Check CD changer

N1252

CD changer
CD magazine error

Check CD magazine

N1253

CD changer
Hardware error
(mechanical)

Check hardware
components and
replace if necessary

N1254

CD changer
Insufficient
temperature

Heating passenger
compartment

2001 Mercedes-Benz ML320

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

me

Audio 30 APS operating
notes

GF82.61-P-0002-03A

Audio 30 APS location of
components

Model 163

GF82.61-P-0002-01D

Model 168

GF82.61-P-0002-01B

Model 170

GF82.61-P-0002-01A

Models 208, 210

GF82.61-P-0002-01C

Audio 30 APS diagnosis,
previous knowledge

AD82.61-P-2001A

Battery voltage 11-14V

Troubleshooting

Complaint

Cause

Note

Remedy

Radio and navigation
unit (A2/56) completely
inoperative

Fuse in A2/56, Voltage
supply for A2/56, Defect at
navigation CD-ROM,
A2/56

AD82.61-P-6001-01A

No communication
possible between Hand-
Held Tester (HHT) and
Audio 30 APS

K line, Radio and
navigation unit (A2/56)

AD82.61-P-6001-02A

Navigation inoperative Navigation CD-ROM is not

loaded or is incorrectly
loaded or incorrect /
defective CD-ROM
Radio and navigation unit
(A2/56)

Load navigation CD,
refer to:
GF82.61-P-0002-03A

Destination finding
system messages are
given too early or too late
(e.g. "please turn right")

Check wheel calibration
and variant coding

AD82.61-P-2001-03A

The expected arrival
time is not correct

Time on radio and
navigation unit (A2/56) is
incorrectly set

Actuate "NAV"
pushbutton and activate
"CLOCK" menu, set
time

Navigation is defective
or imprecise

Check variant coding and
wheel calibration,
Reversing signal,
Wheel speed signal,
Models 163, 168, 208.3,
210:
Cellular telephone and GPS
roof antenna (A2/49),
Models 170, 208.4:
GPS rear antenna
(A2/23a2)

Models 163, 168, 170
Models 208, 210

Refer to:
AD82.61-P-2001-03A
AD82.61-P-6001-04A
AD82.61-P-6001-04B
AD82.61-P-6001-03A
AD82.61-P-6001-05A

2001 Mercedes-Benz ML320

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

me

RADIO AND NAVIGATION UNIT, POWER SUPPLY, CHECKING ELECTRICAL SYSTEM, AUDIO 30 APS - AD82.61-P-
6001-01A

Radio and navigation unit
(A2/56)

No reception of GPS
data

Antenna cable or
Model 163:
Cellular telephone and GPS
roof antenna (A2/49) or
cellular telephone and GPS
antenna splitter (A2/57)
Models 168, 208.3, 210:
Cellular telephone and GPS
roof antenna (A2/49)
Models 170, 208.4:
GPS rear antenna
(A2/23a2)
Radio and navigation unit
(A2/56)

On model 163 only

one antenna cable (for
telephone and GPS)
leads to A2/49. A
defective antenna cable
would therefore effect a
telephone, if connected.

Model 163
AD82.61-P-6001-05B
Models 168,
170,208,210
AD82.61-P-6001-05A

Radio or loudspeaker
functional faults and poor
sound with voice output

Loudspeaker system or
amplifier outputs of radio
and navigation unit
(A2/56). Only with sound
system (code 810):
Left/right audio power
amplifier (N40/3)

Antenna amplifier test
can be carried out using
HHT.

Refer to DMNL
information /
communication
Index 3 (RD)
Index 5 (LS)

Voice output is
fragmentary or
inoperative, but audio
signal replay (e.g. CD
player) functions without
complaint.

Voice in RAM of
navigation computer is
partly erased as a result of
an interruption in voltage
supply.
Data fault on navigation
CD-ROM
Radio and navigation unit
(A2/56)

Avoid excessive

shaking while loading
voice on A2/56.

Replace CD-ROM

Illumination of radio and
navigation unit (A2/56)
inoperative (with terminal
58d, ON)

Terminal 58d signal is not
on radio and navigation
unit (A2/56) .

On models 208, 210,

terminal 58d is not
connected, because A2/56
is connected to A1 via
CAN.

AD82.61-P-6001-06A

2001 Mercedes-Benz ML320

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

me