lights MERCEDES-BENZ GLA 2020 Repair Manual

The
tirepressure monitordoes notwarn youof
an incorr ectlysettire pressure. Observethe
not eson the recomm endedtirepressure
(Y page 308).
The tirepressure monitorisnot able towarn
you ofasudden lossofpressure, e.g.ifthe
tire ispenetr atedbyaforeign object.In the
event ofasudden lossofpressure, bringthe
vehicle toahalt bybraking carefully. Avoid
abrupt steeringmovemen ts.
The tirepressure monitorhas ayellow warning
lamp inthe instr ument cluster forindicatin g
pressure lossoramalfunct ion.Whether the
warning lampflashes orlights upindicates
whether atire pressure istoo low orthe tire
pressure monitorismalfunct ioning:
R ifthe warning lampislit cont inuously, the
tire pressure onone ormore tiresissignifi-
cant lytoo low. Thetirepressure monitoris
not malfunct ioning.
R ifthe warning lampflashes foraround a
minute andthen remains litconst antly, the
tire pressure monitorismalfunct ioning.
In addition tothe warning lamp,amessage
appears inthe multifunct iondisplay .Observe
the inform ationondisplay messages
(Y page 224).
It may take uptoten minutes foramalfunc-
tion ofthe tire pressure monitortobe indica-
ted. Amalfunct ionwill beindicated bythe tire
pressure warninglampflashing forapprox-
imately oneminute andthen remaining lit.
When themalfunct ionhas been rectified, the
tire pressure warninglampgoesoutafter a
few minutes ofdriving.
The tirepressure valuesindicated bythe on-
board computer maydiffer fromthose meas-
ured atagas station withapressure gauge.
The tirepressures shownbythe on-board
computer refertothose measured atsea level.
At high altitudes, thetire pressure valuesindi-
cated byapressure gaugearehigher than
those shown bythe on-board computer. Inthis
case, donot reduce thetire pressures.
The operation ofthe tire pressure monitorcan
be affect edbyinter ferenc efrom radio trans-
mitt ingequipment (e.g.radio headphones,
two-way radios)thatmay bebeing operated in
or near thevehicle. Checking
thetire pressur eelectroni-
cally X
Make surethattheSmart Keyisin position
0048 inthe ignition lock(Ypage 125).
X Press 0059or0065 onthe steerin gwheel
to select theServ. Serv.
menu.
X Press the0063 or0064 button toselect
Tire Pressure Tire
Pressure.
X Press the0076 button .
The current tirepressure ofeach tireis
shown inthe multifunct iondisplay .
If the vehicle wasparked forlonger than
20 minutes, theTire pressure willbe Tire
pressure willbe
displayed afterdriving afew minutes displayed
afterdriving afew minutes
message isshown.
Aft erateach- inprocess, thetire pressure
monit orautomatically detectsnew wheels or
new sensors. Aslong asaclear allocation of
the tire pressure valuetothe individual wheels
is not possible, theTire Pressure Monitor Tire
Pressure Monitor
Active Active
message isshown instead ofthe tire
pressure display.The tirepressures are
already beingmonitored.
If an emergenc yspare wheel ismounted, the
system maycontinue toshow thetire pressure
of the wheel thathasbeen removed forafew
minutes. Ifthis occurs, notethat thevalue dis-
played forthe position wherethespare wheel
is fitt ed isnot thesame asthe current tire
pressure ofthe emergenc yspare wheel.
Tire pressur emonitor warning mes-
sages If
the tire pressure monitordetect sa pressure
loss inone ormore tires,awarning message is
shown inthe multifunct iondisplay .The yellow
tire pressure warninglampthenlights up.
R Ifthe Please Correct TirePressure Please
Correct TirePressure
message appearsinthe multifunct iondis-
play, thetire pressure inat least onetireis
too low. Thetirepressure mustbecorrec ted
when theopportunit yarises.
R Ifthe Check TirePressure Check
TirePressure message
appears inthe multifunct iondisplay ,the tire
pressure inone ormore tireshasdropped
significant ly.The tires must becheck ed.
R Ifthe Tire Pressure WarningTire Tire
Pressure WarningTire
Failure Failure
message appears,thetire pressure
in one ormore tireshasdropped suddenly.
The tires must becheck ed. 314
Tir
epr essureWheels andtires