check engine MERCEDES-BENZ GL SUV 2009 Owner's Guide

Problem
Possible causes/consequences and
X XSolutions The engine cannot be
started using the key. The on-board voltage is too low.
X
Switch off non-essential consumers, e.g. seat heating* or inte-
rior lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 272).
or
X Jump-start the vehicle (Y page 276).
or
X Consult a qualified specialist workshop. The engine cannot be
started using KEYLESS
GO*. The key is in the
vehicle. A door is open. Therefore, the key cannot be detected as easily.
X
Close the door and try to start the vehicle again. There is interference from a powerful source of radio waves.
X
Start your vehicle using the key in the ignition lock. Trailer towing*
Problem
Possible causes/consequences and
X XSolutions The ball coupling can-
not be locked.
The key cannot be
removed from the ball
coupling.
G
Risk of accident
The ball coupling is dirty.
The trailer coupling is damaged.
X Remove the ball coupling and clean it (Y page 203). If the ball
coupling still cannot be locked, remove the ball coupling. It must
no longer be used to tow a trailer, as safe operation is not guar-
anteed.
X Have the entire trailer coupling checked at a qualified specialist
workshop. 248
TroubleshootingPractical advice
* optional
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X
Shift the transmission to position P.
X Switch off all electrical consumers (e.g.
radio, blower, etc.).
X Open the bonnet (Y page 174). X
Open cover :of positive terminal ;.
X Connect positive terminal ;on your vehi-
cle to positive terminal =of donor battery
C using the jump lead, beginning with your
own battery.
X Start the engine of the donor vehicle and
run it at idling speed.
X Remove cover Afrom earth point B.
X Connect negative terminal ?of donor bat-
tery Cto earth point Bof your vehicle
using the jump lead, connecting the jump
lead to donor battery Cfirst.
X Start the engine.
X First remove the jump lead from earth
point Band negative terminal ?, then
from positive terminal ;and positive ter-
minal =, each time disconnecting from the
battery on your own vehicle first.
X Have the battery checked at a qualified
specialist workshop, e.g. a Mercedes-Benz
Service Centre. Towing and tow-starting
Points to remember
G
Risk of accident
If you have the vehicle towed, you must use a
rigid towing bar if:
R the engine is not running.
R there is a brake system malfunction.
R there is a malfunction in the power supply
or the vehicle's electrical system.
The power steering and the brake force boos-
ter do not work when the engine is not run-
ning. Greater braking force will then be
required and brake pedal travel will be longer.
If necessary, depress the brake pedal with full
force.
Before towing away, make sure that the steer-
ing can be moved and is not locked.
If you tow or tow-start another vehicle, its
weight must not exceed the maximum per-
missible gross vehicle weight of your vehicle. Towing and tow-starting
277Practical advice
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Before changing a fuse
X Park the vehicle.
X Switch off all electrical consumers.
X Remove the key from the ignition lock. Dashboard fuse boxes
!
Do not use a pointed object such as a
screwdriver to open the cover in the dash-
board. You could damage the dashboard or
the cover.
X To open: open the front-passenger door.
X Pull cover :outwards in the direction of
the arrow and remove it.
X To close: clip in cover :at the front.
X Fold cover :inwards until it engages.
X Close the front-passenger door. Fuse box in the engine compartment
Illustrated: GL 320 CDI X
To open: open the bonnet (Y page 174).
X Remove moisture from the fuse box using
a dry cloth.
X Fold clamps ;upwards.
X Fold up fuse box cover :and remove it
towards the front of the vehicle.
X To close: check whether the rubber seal is
lying correctly in lid :.
X Insert lid :into the bracket at the rear of
the fuse box.
! The cover must be fitted properly; other-
wise, moisture or dirt could affect the oper-
ation of the fuses.
X Fold down lid :and secure with
clamps ;.
X Close the bonnet (Y page 175). Fuse box in the luggage compartment
X
To open: open the tailgate.
X Turn catch :in the direction of the arrow.
X Open cover ;downwards. Fuses
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