2012 MERCEDES-BENZ M-Class service indicator

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Page 301 of 396

MERCEDES-BENZ M-Class 2012 W166 Owners Manual 
Possible
causesofmalfunct ion:
R the on-board power supply isnot within a
permissible voltrange.
R the temperat ureofthe DC/A Cconv erter is
temporarily toohigh.
R some smallelectronicdevices havea
c

Page 302 of 396

MERCEDES-BENZ M-Class 2012 W166 Owners Manual 
G
WARNING Am
alfun ction inthesyst emhas been
det ectedifon eof thefoll owin gcon dition s
occ urs:
R theind icat orlamp intheSO Sbutt ondoes
no tlight updurin gthe syst emself-
diagno sis.
R the ind

Page 304 of 396

MERCEDES-BENZ M-Class 2012 W166 Owners Manual 
Av
oice conn ection isestablished between
the Mercedes-B enzCustomer Assistance
Center andthevehicle occupant s.
X Descr ibethe type ofassistance needed.
The Mercedes-B enzCustomer Assistance
Center

Page 306 of 396

MERCEDES-BENZ M-Class 2012 W166 Owners Manual 
Vehi
cle remo teope ning If
yo uha ve uni ntentio nallylocked your
veh icle(e .g. the Sma rtKey isstil lin the
veh icle) and arep laceme ntSma rtKey isnot
ava ilab le,the vehiclecan beopene dby a
Mer