Tire Pressure Monitoring System
Tire Pressure Monitor TPMThe Concept
TPM check the inflation pressures of the four mounted tires. The system notifies if there is a significant loss of pressure in one or more tires.
Functional Requirement
In order to assure the reliable reporting of a flat tire, the system must be reset while all tire inflation pressures are correct. Always use wheels with TPM electronics. Otherwise the system may malfunction.
NOTE: Each time a tire inflation pressure has been corrected or a wheel or tire has been changed, reset the system.
System Limitations
Caution: TPM cannot warn you in advance of sudden severe tire damage caused by outside influences.
The system does not work correctly if it has not been reset, for example, a flat tire may be indicated even though the tire inflation pressures are correct.
The system is inactive and cannot indicate a flate tire if a wheel without TPM electronics, such as a compact spare wheel, has been mounted, or if TPM is temporarily malfunctioning due to other systems or devices using the same radio frequency.
Status Indicator on the Control Display
The color of the tires represents the status of the tires and the system.
TPM takes into account that tire pressures change while the vehicle is being driven. The tire pressures do not need to be corrected unless the TPM instructs you to do so by means of color indicators.
"Green"
The tire inflation pressure corresponds to the established target value.
"TPM active" appears on the Control Display.
"One Wheel Yellow"
There is a flat tire or substantial loss of tire pressure in the indicated tire. A message appears on the Control Display.
"All Wheels Yellow"
There is a flat tire or substantial loss of tire pressure in several tires. A message appears on the Control Display.
"Gray"
The system cannot detect a puncture.
Possible reasons for this:
TPM is being reset
Temporary malfunction caused by systems or devices using the same radio frequency.
Malfunction
Resetting the System
NOTE:Reset the system again after each correction of the tire inflation pressure and after every tire or wheel change.
Resetting finishes during driving, which can be interrupted at any time. When driving resumes, resetting is continued automatically. Do not reset the system when driving with a compact wheel.
1. Press the MENU button.
This opens the start menu.
2. Press the controller to open the menu.
3 Select "Settings" and press the controller.
4. Select "Vehicle / Tires" and press the controller.
5. Change to upper field if necessary. Turn the controller until "TPM" is selected and press the controller.
6. Start the engine, but do not start driving.
7. Select "Reset" and press the controller.
8. Select "Yes" and press the controller.
9. Start to drive. The tires are shown in gray and "Resetting TPM..." is displayed.
After a few minutes of driving, the set tire inflation pressures in the tires are applied as the set values to be monitored. Resetting finishes during driving. The tires are shown in green on the Control Display.
NOTE: If a flat tire is detected during resetting and applying the tire inflation pressures, all tires are shown in yellow on the Control Display. The message "Tire low!" is displayed.
Message With Low Tire Inflation Pressure
CAUTION! The warning lamp lights up yellow. A message appears on the Control Display. In addition, an acoustic signal sounds. There is a flat tire or extensive inflation pressure loss.
1. Reduce speed and stop the vehicle carefully. Avoid sudden braking and steering maneuvers.
2. Check whether your vehicle is equipped with standard tires or run-flat tires.
You will recognize run-flat tires by a circular symbol containing the letters RSC on the side of the tire.
Standard tires
1. If all four wheels are shown in yellow, identify the damaged tire on the vehicle.
2. Replace the damaged wheel or wheels,
In contrast to a compact wheel, a spare wheel is equipped with the necessary TPM electronics and also monitored after mounting and after resetting the system.
Run-flat tires
1. Cautiously reduce speed to below 50 mph/ 80 km/h. Avoid severe braking and steering maneuvers and do not exceed a speed of 50 mph/80 km/h.
CAUTION! If the vehicle is not equipped with runflat tires, refer to page 229, do not continue driving. Continuing to drive with a flat tire could cause severe accidents.
2. In the event of complete tire pressure loss, 0 psi/0 kPa, you can estimate the possible distance for continued driving on the basis of the following guide values:
- With a light load:
1 to 2 persons without luggage:
approx. 155 miles/250 km
- With a medium load:
2 persons, cargo bay full, or s/250 km
- With a medium load:
2 persons, cargo bay full,
CAUTION! Drive reservedly and do not exceed a speed of 50 mph/80 km/h. In the event of pressure loss, vehicle handling changes. This includes reduced tracking stability in braking, extended braking distance and altered natural steering characteristics.
If unusual vibrations or loud noises occur while the vehicle is being driven, this can indicate final failure of the damaged tire. Reduce speed and stop at a suitable location as soon as possible, otherwise pieces of the tire could become detached and cause an accident. Do not continue driving.
Malfunction
The yellow warning lamp flashes and then lights up continuously. The tires are shown in gray on the Control Display and a message is displayed. No flat tire can be detected.
A message like this is displayed in the following
situations:
- In case of a malfunction;
have the system checked.
- If a wheel is mounted without TPM electronics.
- If TPM is temporarily interfered with by other systems or devices which use the same radio frequency.
Declaration according to NHTSA/ FMVSS 138 Tire Pressure Monitoring Systems
Each tire, including the spare, should be checked monthly when cold and inflated to the inflation pressure recommended by the vehicle manufacturer on the vehicle placard or tire inflation pressure label. If your vehicle has tires of a different size than the size indicated on the vehicle placard or tire inflation pressure label, you should determine the proper tire inflation pressure for those tires. As an added safety feature, your vehicle has been equipped with a tire pressure monitoring system, TPMS, that illuminates a low tire pressure telltale when one or more of your tires are significantly underinflated. Accordingly, when the low tire pressure telltale illuminates, you should stop and check your tires as soon as possible, and inflate them to the proper pressure. Driving on a significantly underinflated tire causes the tire to overheat and can lead to tire failure. Underinflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability. Please note that the TPMS is not a substitute for proper tire maintenance, and it is the driver's responsibility to maintain correct tire pressure, even if underinflation has not reached the level to trigger illumination of the TPMS low tire pressure telltale.
The TPMS malfunction indicator is combined with the low tire pressure telltale. When the system detects a malfunction, the telltale will flash
for approximately one minute and then remain continuously illuminated. This sequence will continue upon subsequent vehicle startups as
long as the malfunction exists. When the malfunction indicator lights up, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of replacement or alternate tires or wheels on the vehicle that prevent the TPMS from functioning properly. Always check the TPMS malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS to continue to function properly.