brake MERCEDES-BENZ G55AMG 2003 W463 Service Manual

240 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
-
The yellow ABS malfunction indi-
cator lamp comes on while driv-
ing.
You engaged the differential locks. The ABS,
ESP, BAS, EBB and 4-ETS are switched off.

The driving systems will switch on
again after the differential locks have
been disengaged.
The ABS has detected a malfunction and has
switched off. The ESP, BAS, EBB and 4-ETS
are also switched off (see messages in dis-
play).
If the ABS control unit is malfunctioning, oth-
er systems such as the navigation system or
Rear Park Assist* may also malfunction.
The brake system is still functioning normally
but without the ABS available.

Continue driving with added caution.
Wheels will lock during hard braking
reducing steering capability.

Have the system checked at an autho-
rized Mercedes-Benz Light Truck Cen-
ter as soon as possible.
Failure to follow these instructions in-
creases the risk of an accident.
The ABS has switched off because charging
voltage has fallen below 10 volts. The battery
may not be charged.

Turn off unnecessary electric con-
sumers.
When the battery voltage is above this
value again, the ABS is operational
again.

Note the messages in the multifunc-
tion display (
page 246).

241 Practical hints
What to do if …
Problem
Possible cause
Suggested solution
3
(Canada only)
;
(USA only)The red brake warning lamp
lights up while driving and you
hear a warning sound.
You are driving with the parking brake set.

Release the parking brake
(page 44).

Also note the messages in the multi-
function display (
page 246).
The red brake warning lamp
lights up while driving.
There is insufficient brake fluid in the reser-
voir.

Risk of accident! Carefully stop the
vehicle and notify an authorized
Mercedes-Benz Light Truck Center.
Do not add brake fluid! This will not
solve the problem.

Also note the messages in the multi-
function display (
page 246).
Warning!
G
Driving with the brake warning lamp illumi-
nated can result in an accident. Have your
brake system checked immediately if the
brake warning lamp stays on.
Don’t add brake fluid before checking the
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot
engine parts and the brake fluid catching
fire. You can be seriously burned.
!If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks.

242 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
3
(Canada only)
;
(USA only)
-
The red brake warning lamp and
the yellow ABS malfunction indi-
cator lamp come on when the
engine is running and you hear a
warning sound for approximately
five seconds.
The EBB has detected a malfunction and has
switched off. You should be prepared for your
vehicle to perform differently than normal
when braking.

Continue driving with added caution.

Have the system checked at an autho-
rized Mercedes-Benz Light Truck Cen-
ter as soon as possible.

Also note the messages in the multi-
function display (
page 246).
Failure to follow these instructions in-
creases the risk of accidents.
1
The red SRS indicator lamp lights
up while driving.
There is a malfunction in the restraint sys-
tems. The airbags or emergency tensioning
device (ETDs) could deploy unexpectedly or
fail to activate in an accident.

Drive with added caution to the near-
est authorized Mercedes-Benz Light
Truck Center.
Warning!
G
In the event a malfunction of the SRS is indi-
cated as outlined above, the SRS may not be
operational.
For your safety, we strongly recommend
that you visit an authorized Mercedes-Benz
Light Truck Center immediately to have the
system checked; otherwise the SRS may not
be activated when needed in an accident.
This could result in serious or fatal injury, or
it might deploy unexpectedly and unneces-
sarily which could also result in an accident
and/or injury to you or others.

247 Practical hints
What to do if …
On the pages that follow, you will find a
compilation of all the messages that may
appear in the display.
Warning!
G
No messages will be displayed if either the
instrument cluster or the multifunction dis-
play is inoperative. Systems that have a sig-
nificant influence on handling performance
may not be functioning.
Contact your nearest authorized
Mercedes-Benz Light Truck Center.
iTurning the key in starter switch to
position2 causes all lamps as well as
the multifunction display to come on.
Ensure that they are all in working or-
der before starting your journey.
Display
Possible cause
Suggested solution
Category
-
ABS SYSTEM
VISIT WORKSHOP!
The ABS has detected a malfunction
and has switched off. The ESP, BAS,
EBB and 4-ETS are also deactivated.
The brake system is still functioning
normally but without the ABS avail-
able. Wheels will lock during hard
braking, reducing steering capabili-
ty.

Continue driving with added
caution.

Have the system checked at
an authorized Mercedes-Benz
Light Truck Center as soon as
possible.
Failure to follow these instructions
increases the risk of accident.
2

248 Practical hintsWhat to do if …-
DISPLAY DEFECTIVE
VISIT WORKSHOP!
The ABS or the ABS display is mal-
functioning.
Wheels will lock in hard braking re-
ducing steering capability.

Continue driving with added
caution.

Have the system checked at
an authorized Mercedes-Benz
Light Truck Center as soon as
possible.
Failure to follow these instructions
increases the risk of accident.
2
ABS NOT AVAILABLE
DIFFERENTIAL LOCKED
You have engaged the differential
locks.

The ABS switches on again af-
ter the differential locks have
been disengaged.
1
BAS
BRAKE ASSIST
VISIT WORKSHOP!
The BAS has detected a malfunction
and switched off.
The brake system is still functioning
normally but without the BAS avail-
able. Wheels will lock in hard braking
reducing steering capability.

Continue driving with added
caution.

Have the system checked at
an authorized Mercedes-Benz
Light Truck Center as soon as
possible.
Failure to follow these instructions
increases the risk of accident.
2
Display
Possible cause
Suggested solution
Category

250 Practical hintsWhat to do if …Display
Possible cause
Suggested solution
Category
3
(Canada only)
;
(USA only)
BRAKE PAD WEAR
VISIT WORKSHOP!
The brake pads have reached their
wear limit.

Have the brake pads replaced
as soon as possible.
2
BRAKE FLUID
VISIT WORKSHOP!
There is insufficient brake fluid in the
reservoir.

Risk of accident! Stop the vehi-
cle and notify an authorized
Mercedes-Benz Light Truck
Center. Do not add brake fluid!
This will not solve the problem.
2
Warning!
G
Driving with the last message displayed can
result in an accident. Have your brake sys-
tem checked immediately.
Don’t add brake fluid before checking the
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot
engine parts and the brake fluid catching
fire. You can be seriously burned.
!If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks. !Brake pad thickness must be visually
checked by a qualified technician at the
intervals specified in the Service book-
let.

256 Practical hintsWhat to do if …Display
Possible cause
Suggested solution
Category
3
(Canada
only)
;
(USA only)
ELECTRIC BRAKE BOOSTER
VISIT WORKSHOP!
The EBB has detected a malfunction
and has switched off.
The brake system is still functioning
normally but without the EBB avail-
able.

Continue driving with added
caution.

Have the system checked at
an authorized Mercedes-Benz
Light Truck Center as soon as
possible.
Failure to follow these instructions
increases the risk of accident.
2
ESP
DISPLAY DEFECTIVE
VISIT WORKSHOP!
The ESP or the ESP display is mal-
functioning.

Continue driving with added
caution.

Have the system checked at
an authorized Mercedes-Benz
Light Truck Center as soon as
possible.
Failure to follow these instructions
increases the risk of accident.
2

258 Practical hintsWhat to do if …ESP
ELEC. STABIL. PROG.
VISIT WORKSHOP!
The ESP is switched off due to a mal-
function or an interruption in the
power supply.
The brake system is still functioning
normally but without the ESP avail-
able.
If in addition the ABS is malfunction-
ing, only partial engine output will be
available.

Continue driving with added
caution.

Have the system checked at
an authorized Mercedes-Benz
Light Truck Center as soon as
possible.
Failure to follow these instructions
increases the risk of accident.
2
ì
FUNCTION
NOT AVAILABLE!
This display appears if button
ì

or
í
on the multifunction steer-
ing wheel is pressed and the vehicle
is not equipped with a telephone.
3
Y
HOOD OPEN!
You are driving with the hood open.

Close the hood (
page 217).
2
Display
Possible cause
Suggested solution
Category

259 Practical hints
What to do if …
Display
Possible cause
Suggested solution
Category
I
AUTOM. LIGHT ON
REMOVE KEY!
You have forgotten to remove the
key.

Remove the key from the
starter switch.
1
REPLACE KEY
VISIT WORKSHOP!
No additional code available for
SmartKey.

Visit an authorized
Mercedes-Benz Light Truck
Center.
2
.
3RD BRAKE LAMP
CHECK LAMP!

The high mounted brake lamp is mal-
functioning. This message will only
appear if all light emitting diodes
have stopped working.

Visit an authorized
Mercedes-Benz Center as
soon as possible.
2
ADD. TURN SIG LAMP, LH
CHECK LAMP!
The left turn signal in the side mirror
is malfunctioning. This message will
only appear if all light emitting
diodes have stopped working.

Have the LEDs replaced as
soon as possible.
2
ADD. TURN SIG LAMP, RH
CHECK LAMP!
The right turn signal in the side mir-
ror is malfunctioning. This message
will only appear if all light emitting
diodes have stopped working.

Have the LEDs replaced as
soon as possible.
2
AUTOM. LIGHT ON
REMOVE KEY!
You have left the key in the starter
switch.

Remove key from the starter
switch.
1

260 Practical hintsWhat to do if …Display
Possible cause
Suggested solution
Category
.
BRAKE LAMP
VISIT WORKSHOP!
Brake lamp illumination is delayed or
lamp is permanently on.

Visit an authorized
Mercedes-Benz Light Truck
Center as soon as possible.
2
BRAKE LAMP, L
CHECK LAMP!

The left brake lamp is malfunction-
ing.

Visit an authorized
Mercedes-Benz Center as
soon as possible.
2
BRAKE LAMP, R
CHECK LAMP!

The right brake lamp is malfunction-
ing.

Visit an authorized
Mercedes-Benz Center as
soon as possible.
2
DISPLAY DEFECTIVE
VISIT WORKSHOP!
The display for the lamps or the sys-
tem is malfunctioning.

Visit an authorized
Mercedes-Benz Light Truck
Center as soon as possible.
2
FRONT FOGLAMP, L
CHECK LAMP!

The left front fog lamp is malfunc-
tioning.

Replace the bulb as soon as
possible.
2
FRONT FOGLAMP, R
CHECK LAMP!

The right front fog lamp is malfunc-
tioning.

Replace the bulb as soon as
possible.
2
HIGH BEAM, L
CHECK LAMP!

The left high beam lamp is malfunc-
tioning.

Replace the bulb as soon as
possible.
2
HIGH BEAM, R
CHECK LAMP!

The right high beam lamp is malfunc-
tioning.

Replace the bulb as soon as
possible.
2