Tire pressure sensor MERCEDES-BENZ SL500 2005 R230 Owner's Manual

290 OperationTires and wheelsChecking tire inflation pressure
Regularly check your tire inflation pressure
at least once a month.
Check and adjust the tire inflation
pressure when the tires are cold. The tires
can be considered cold if the vehicle has
been parked for at least three hours or
driven less than one mile (1.6 km).
If you check the tire inflation pressure
when the tires are warm (the vehicle has
been driven for several miles or sitting less
than three hours), the reading will be
approximately 4 psi (0.3 bar) higher than
the cold reading. This is normal. Do not let
air out to match the specified cold tire in-
flation pressure. Otherwise, the tire will be
underinflated.Checking tire inflation pressure
manually
Follow the steps below to achieve correct
tire inflation pressure:

Remove the cap from the valve on one
tire.

Firmly press a tire gauge onto the
valve.

Read tire inflation pressure on tire
gauge and check against the recom-
mended tire inflation pressure on the
placard on the driver’s door B-pillar
(page 288). If necessary, add air to
achieve the recommended tire inflation
pressure.

Install the valve cap.

Repeat this procedure for each tire.
Checking tire inflation pressure
electronically
The tire inflation pressure monitor only
functions on wheels that are equipped with
the proper electronic sensors. It monitors
the tire inflation pressure, as selected by
the driver, in all four tires. A warning is
issued to alert you to a decrease in tire
inflation pressure in one or more of the
tires.
You can call up the tire inflation pressure
monitoring display using the control
system (
page 156).
iIf you have overfilled the tire, release
tire inflation pressure by pushing the
metal stem of the valve with e.g. a tip of
a pen. Then recheck the tire inflation
pressure with the tire gauge.

343 Practical hints
What to do if …
Left display
Right display
Possible cause
Possible solution
Tire pres. monitor
reactivated

The tire pressure monitoring system is
using the current pressure values as
the basis for monitoring.
Tire pressure
displayed only
after driving
a few minutes
The tire inflation pressure is being
checked.
Tire pres.
monitor
temporarily
unavailable
The tire inflation pressure monitor is
unable to monitor the tire inflation
pressure due to

the presence of several wheel sen-
sors in the vehicle.


excessive wheel sensor tempera-
tures.


a nearby radio interference source.


unrecognized wheel sensors
mounted.

Remove any extra wheel sensors from the
vehicle
As soon as the causes of the malfunction have
been removed, the tire pressure monitoring
system automatically becomes active again.

344 Practical hintsWhat to do if …Left display
Right display
Possible cause
Possible solution
Reactivate tire
pressure monitor
after rectifying
pressure
There was a tire inflation pressure
warning message.
The yellow warning lamp for the tire
pressure monitoring system comes on
and you have not reactivated the sys-
tem since the last tire inflation pres-
sure warning message.

Reactivate the tire pressure monitoring
system after correcting the tire inflation
pressure values (
page 293).
Tire pres.
monitor inoperative
Drive to workshop
The tire inflation pressure monitor is
malfunctioning.

Have the tire inflation pressure monitor
checked by an authorized Mercedes-Benz
Center.
A wheel without proper sensor was in-
stalled.

Have the wheel checked.
Warning!
G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle.
You may lose control of the vehicle. Contin-
ued driving with a flat tire will cause exces-
sive heat build-up and possibly a fire.

446 IndexAir conditioner refrigerant 433
Air conditioning (cooling)
Turning off 191
Turning on 191
Air pressure 305
Air pressure see Tire inflation pressure
Air pump, electric 373
Turning on 398
Air recirculation mode 187
Air volume adjustment 185
AIRBAG OFF
Warning lamp 334
Airbags 63
Children 64
Front 68
Head-thorax 68, 69
Kneebag 68
Passenger 68Alarm
Audible 78, 88
Canceling 90
Visual 88
Alignment bolt 439
Alignment bolt (vehicle tool kit) 396
Anticorrosion/antifreeze 432, 437
Anti-theft alarm system 88
Arming 89
Canceling the alarm 90
Disarming 89
Anti-theft systems
Anti-theft alarm system 88
Tow-away alarm 90
Aquaplaning see Hydroplaning
Armrest
Storage compartment 229
Ashtray 29, 233
Aspect ratio 305
At the gas station 267
ATF (automatic transmission fluid) 275Automatic climate control 29, 182
Center air vents 29
Deactivating 191
Residual heat utilization 190
Side air vents 29
Temperature sensor 31
Automatic shift program 170
Automatic transmission 164
Accelerator position 171
Comfort program mode 170
Emergency operation (Limp Home
Mode) 177
Gear ranges 167
Gear selector lever 30, 164
Gear selector lever position 164, 168
Gear shifting malfunctions 177
Kickdown 171
Manual shifting 166
One-touch gearshifting 166
Program mode selector switch 30,
170
Transmission fluid 275

464 IndexSwitching on
Front fog lamps 127
Rear fog lamp 127
Switching on headlamps 51
Symbol
Distance warning function* 142, 212
Synchronizing
ESP 341
Power windows 195
Synchronizing time with head unit 149
T
Tachometer 27, 132
Tail lamps 381, 385
Technical data
Electrical system 428
Main dimensions 429
Rims and tires 422
Weights 430
Windshield and headlamp washer
system 438Tele Aid 237
Emergency calls 239
Information 242
Initiating an emergency call
manually 240
Messages in display 364
Roadside Assistance 240
SOS button 31, 240
Tele Aid system 237
Tele Aid System 444
Telephone* 28, 236
Answering a call 162
Dialing 162
Ending a call 163
Hands-free microphone 31
Loading phone book* 163
Messages in display 364
Operating 161
Redialing 163
Telephones and two-way radios 264Temperature
Outside temperature indicator 133
Sensor 31
Setting interior temperature 185
Setting units in display 148
Tires 289
Tightening torque 399, 444
Time
Settings (control system) 149
Time display mode
Setting 151
TIN 307
Tire
Vehicle maximum load on 307
Tire and Loading Information 283
Tire and loading terminology 305
Tire care and maintenance 280
Tire Identification Number see TIN
Tire inflation pressure 390
Checking 269, 288, 290
Setting units 156