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FTM Flat Tire Monitor
Concept
The system detects tire inflation pressure loss
on the basis of rotation speed differences be‐
tween the individual wheels while driving.
In the event of a tire inflation pressure loss, the
diameter and therefore the rotational speed of
the corresponding wheel changes. The differ‐
ence will be detected and reported as a flat
tire.
The system does not measure the actual infla‐
tion pressure in the tires.
Functional requirements
The following conditions must be met for the
system; otherwise, reliable flagging of a loss of
tire inflation pressure is not assured:
▷ After a tire or wheel replacement, an initial‐
ization was performed with the correct tire
inflation pressure.
▷ After the tire inflation pressure was ad‐
justed to a new value, an initialization was
performed.
Status display
The current status of the flat tire monitor can
be displayed, e.g., whether the RPA is active.
Via iDrive:
1.
"My Vehicle"
2. "Vehicle status"
3. "Flat Tire Monitor"
The status is displayed.
Initialization required
An initialization must be performed in the fol‐
lowing situations:
▷ After the tire inflation pressure has been
adjusted.
▷ After a tire or wheel replacement.
Performing initialization
When initializing, the set tire inflation pres‐
sures serve as reference values in order to de‐
tect a flat tire. Initialization is started by con‐
firming the tire inflation pressures.
Do not initialize the system when driving with
snow chains.
Using iDrive:
1. "My Vehicle"
2. "Vehicle status"
3. "Flat Tire Monitor"
4. Switch on drive-ready state and do not
drive off.
5. Start the initialization with: "Perform reset"
6. Drive away.
The initialization is completed while driving,
which can be interrupted at any time.
The initialization automatically continues when
driving resumes.
Messages
General information
When a flat tire is indicated, DSC Dynamic Sta‐
bility Control is switched on, if needed.
Safety information
WARNING
A damaged regular tire with low or miss‐
ing tire inflation pressure impacts handling,
such as steering and braking response. Run-
flat tires can maintain limited stability. There is
a risk of an accident. Do not continue driving if
the vehicle is equipped with normal tires. Fol‐
low the information on run-flat tires and contin‐
ued driving with these tires.◀
Indication of a flat tire
A yellow warning light is illuminated in
the instrument cluster.
Seite 307
Wheels and tires Mobility
307
Online Edition for Part no. 01402981865 - VI/17
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