TPMS MERCEDES-BENZ A-CLASS SEDAN 2020 Owner's Manual

Fu
rther relat ed subje cts:
R Noteson tirepr essur e(/ page42 4)
R Tire pressur eta ble (/ page425)
R Tire and Loadi ngInfo rm atio nplacar d
(/ page43 1) Ti
re pres sur emoni toring system Fu
nction ofthetir epr essur emoni toring sys‐
te m &
DANG ER Risk ofacc iden tdue toinc or‐
re ct tirepr ess ure
Eac htir e, incl uding thespar etir e(if present ),
should becheckedat leas tonc eamont h
when coldandthen inflated tothepr essur e
re comme ndedbytheve hicle manuf acturer
(see theTire and Loadi ngInfo rm atio nplac‐
ar don thedr iver's side B‑pillar orthetir e
pr essur eta ble ontheinside ofthefuel filler
fl ap ofyour vehicle). Ifyo ur vehicle hastires
of adif fere nt size than thesize indicat edon
th eTire and Loadi ngInfo rm atio nplacar dor th
etir epr essur eta ble, youmus tfind outth e
cor rect tirepr ess ures forth ese tires.
As anadded safetyfe atur e,your vehicle has
been equipped withatir epr essur emonit or‐
ing system (TPMS) that illumin ates alow tire
pr essur eind icat orlam pwhen oneor mor eof
yo ur tires aresign ifican tly und erinf lated.
Ac cor ding ly,if th elow tirepr essur eindicat or
lam plights up,yousho uld stop and check
yo ur tires assoo nas poss ible, andinflate
th em tothecor rect press ure. Driving on a
sig nifica ntly underinf late dtir ecauses thetir e
to ove rheat and canlead totirefa ilur e.
Un der inflation alsoincreases fuelconsum p‐
tion ,re duces thelife ex pect ancy ofthetir e
and mayadv ersel yaf fect thehandling and
br aking charact eristic sof theve hicle. Please
no te that theTPMS isno ta subs titutefo r
pr oper tiremaint enanc e,and itis thedr iver's
re sponsibili tyto maint aincorrect tirepr es‐
su re,eve nif und erinf latio nha sno tre ac hed
th eleve lto trig ge rill umina tionoftheTPMS
lo w tirepr essur eindicat orlam p. Yo
ur vehicle hasalso been equipped witha
TPMS malfunction indicatortoindic atewhen
th esy stem isno toper ating proper ly.The
TPM Smal functi onindicatoris combined with
th elow tirepr essur eindicat orlam p.When
th esy stem detects amal functi on,theindica‐
to rlamp willfl ash forapp roxima tely amin ute
and then remain continuously illumina ted.
This sequence willcontinue upon subseq uent
ve hicle star t-ups aslon gas themalfunct ion
ex ists.
When themalfunct ionindicat orisillumina‐
te d, thesy stem mayno tbe able todetect or
sig nal low tirepr ess ure asintende d.TPM S
mal functi onsmayoccu rfo ra va riet yof rea‐
son s,inc ludin gth eins tallation ofinc om pati‐
ble replacemen tor alternat etir es orwheels
on theve hicle that preve nttheTPMS from
func tioningproper ly.
Alw aysch eckth eTPMS malfunct ionwarning
lam paf te rre placing oneormor etir es or
wheels onyour vehicle toensur eth at the
re placemen tor alternat etir es and wheels Wheels
andtires 42
7

allo
wtheTPMS tocontinu eto function prop‐
er ly. The
system checks thetir epr essur eand thetir e
te mp eratur eof thetir es installed ontheve hicle
by means ofatir epr essu resensor .
Ne wtirepr essur esensor s,e.g. inwint ertires,
ar eaut omaticall yta ught -indur ing thefirs tjou r‐
ne yth ey areused.
The tirepr essur eand thetir ete mp eratur e
appear inthemultifunc tiondispla y
(/ page428).
If th er eis asubs tantia lpr ess ureloss orifth e
tir ete mp eratur eis exc essiv e,youwill bewarned
in thefo llo wing ways:
R Viadispla ymes sages(/ page50 8)
R Viath e0077 warning lam pin theins trument
clus ter(/ page528)
The tirepr essu remonit oring system isonl yan
aid. Itis thedr iver's responsibili tyto setth etir e
pr essur eto there comme ndedcoldtirepr ess ure
su itab leforth eoper ating situation .Se tth etir e
pr essur efo rcold tires using atir epr essu re ga
ug e. No tethat thecor rect tirepr ess urefo rth e
cur rent operati ng situa tionmu stfirs tbe taught -
in to thetir epr essur emonit oring system.
In mos tcases, thetir epr essur emonit oring sys‐
te m wil lau tomatical lyupd ateth ene wrefere nce
va lues afte ryo uha ve chang edthetir epr essur e.
Yo ucan ,ho we ver,also updat eth ere fere nce val‐
ues byrestar tin gth etir epr essur emonit oring
sy stem manuall y(/ page429).
Sy stem limit s
The system maybe impair edorma yno tfunc tion
in thefo llo wing situat ions:
R The tirepr essur ehas been setinc orrectl y
R The reisasudden pressur eloss caused, for
ex am ple, byafo re ign obje ctpene trating the
tir e
R Thereis ama lfunctio ncau sedby ano ther
ra dio signal source
Be sureto also payatt ent ion tothefo llo wing
re lat ed topic:
R Noteson tirepr essur e(/ page42 4) Chec
kingthetir epr essur ewit hth etir epr es‐
sur emoni toring system
Re quirement s:
R The ignit ionisswitc hedon.
On- boar dcom puter:
4 Service 5
Tires
One ofthefo llo wing displa ysappear s:
R Cur rent tirepr ess ureand tirete mp eratur eof
th eindividual wheels: R
Tire pressure willbedisplayed afterdriving a
few minutes
R Tire Pressure MonitorAct ive: thete ac h-in
pr oce ssofthesy stem isno tye tcomple te. 428
Wheels andtires