Tire Pressure Monitoring System
TPM Tire Pressure Monitor
The concept
TPM checks the tire inflation pressure in the four mounted tires. The system reports when the tire inflation pressure has dropped considerably in one or several tires.
Function requirements
In order to assure the reliable reporting of a flat tire, the system must have been reset with the correct tire inflation pressure.
Always use wheels with TPM electronics, otherwise fault-free operation of the system is not ensured.
NOTE: Reset the system again after each correction of the tire inflation pressure and after every tire or wheel change.
System limits
CAUTION!TPM cannot announce sudden serious ire damage caused by external influences.
The system does not function properly if it has not been reset, e.g. a flat tire is reported despite correct tire inflation pressures.
The system is inactive and cannot display a flat tire if a wheel has been mounted without TPM electronics, e.g. a compact wheel, or if TPM is temporarily interfered with by other systems or devices which use the same radio frequency.
Status display on Control Display
The tire and system status is indicated by the color of the tires. TPM takes the fact that the tire pressure changes during driving into account. A correction is only required if requested by TPM with the color.
"Green"
The tire pressure matches the learned set state. "TPM active" is displayed on the Control Display.
"One wheel is yellow"
Flat tire or a major drop in inflation pressure in the indicated tire. A message appears on the Control Display.
"All wheels are yellow"
Flat tire or a major drop in inflation pressure in several tires. A message appears on the Control Display.
"Gray"
The system cannot detect a flat tire.
Reasons for this can be:
- TPM is being reset
- Temporary interference due to systems or devices which use the same radio frequency
- Malfunction
Resetting 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. "Vehicle Info"
2. "Vehicle Status"
3. "Reset TPM"
4. Start the engine - do not drive away
5. Start the initialization using "Reset TPM"
6. 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
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. Cautiously reduce speed to below 50 mph/ 80 km/h. Avoid sudden braking and steering maneuvers. Do not exceed a speed of 50 mph/80 km/h.
CAUTION! If the vehicle is not equipped with run-flat tires as provided at the factory, 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 4 persons without luggage:
approx. 95 miles/150 km
- With a full load:
4 or more persons, cargo bay full:
approx. 30 miles/50 km
CAUTION!Drive cautiously and do not exceed speeds of 50 mph/80 km/h or else you run the risk of causing an accident. 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 without TPM electronics is mounted, e.g. a compact wheel
- If TPM is temporarily interfered with by other systems or devices which use the same radio frequency
Explanation according to the NHTSA/ FMVSS 138 Tire Pressure Monitoring Systems
Each tire, including the spare (if provided), 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 is 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.
Your vehicle has also been equipped with a TPMS malfunction indicator to indicate when the system is not operating properly. 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 start-ups as long as the malfunction exists. When the malfunction indicator is illuminated, 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.