BMW 5 Series: System overview

The electronic tire pressure label is an extension to the vehicle software. No additional components are required for the integration of this new function. All the information is supplied by sensors that are already built into the vehicle.

System overview of the electronic tire pressure label in the G30

1. Remote control receiver (FBD)
2. Wheel electronics
3. Dynamic Stability Control (DSC)
4. Outside temperature sensor
5. Central Information Display (CID)

Operation

Menu guidance for the electronic tire pressure label on the G30

1. My Vehicle
2. Vehicle status
3. Tire settings
4. Tire type (summer/winter)

A distinction must be made when using the electronic tire pressure label in the following three situations:

• Checking the tire pressures.
• Checking the tire pressures after a wheel/tire change.
• Checking the tire pressures of wheel and tire combinations that have not been saved (special sizes).

The relationships and the special features of operation are described in greater detail below.

Checking the tire pressures

The tire pressure to be set on wheels that have already been taught-in can be identified from the setting menu as follows:

• My Vehicle
• Vehicle status
• Tire Pressure Monitor

Adjustment of the tire pressures for wheels that have already been taught-in in the Central Information Display on the G30

If the tire pressures have to be checked, it is only necessary to call up the Tire Pressure Monitor (TPM) menu and compare the relevant nominal pressures displayed with the actual pressures. It must be noted here that the wheel and tire combination stored must match the wheel sizes actually fitted to the vehicle. The difference displayed must then be corrected with the help of a tire filling station. It is not necessary to reset the tire pressure control as it was on previous systems.

A warning issued by the Tire Pressure Monitor (TPM) always relates to the current nominal pressure.

There is no TPM reset provision for the wheel and tire combinations stored (standard sizes). The TPM warnings always relate to the nominal pressure displayed. No nominal pressure is displayed if special sizes have been selected. In this case, it is still necessary to carry out a manual TPM reset (see "tire Selection: Special Sizes" chapter).

Checking the tire pressures after a wheel change

The tire pressure to be set on new wheels can be completed from the setting menu as follows:

• My Vehicle
• Vehicle status
• Tire Pressure Monitor (TPM)
• Tire settings
• Tire type (summer/winter)

Adjustment of the tire sizes to be set on new wheels in the Central Information Display on the G30

The procedure for setting a new tire type is only necessary under the following conditions:

• A new set of wheels has been fitted.
• The max vehicle speed has changed.
• The wheel and tire combination stored in the Central Information Display (CID) does not correspond to the actual combination.

The nominal pressures displayed after the input and confirmation of a new tire type always relate to the cold tire pressure. It is not possible to compare actual and nominal pressures through the Central Information Display (CID) as the system assumes that a new set of wheels has been fitted and its wheel electronics do not transmit any tire pressures while the vehicle is stationary.

A warning message may be displayed in the event of incorrect operation of the system. If, for instance, a new tire type is selected and confirmed after a long highway journey, although the wheels currently fitted have not been swapped, there will be considerable pressure deviations between the nominal pressure displayed in the CID (cold tire pressure) and the actual tire pressure on the wheels (warm tire pressure) because of the temperature differences. The pressure deviation described can, however, only be determined using a tire inflator, as the system does not display any actual pressure on the CID after confirmation of the new tire type. There could be a new warning message in the subsequent teach-in drive if the tire pressures (warm tire pressure) in the wheels were now to be adjusted to the nominal pressure displayed on the CID (cold tire pressure) using the tire inflator.

The background reason for this is the incorporation of the tire air temperatures transmitted. When the vehicle is in motion, the wheel electronics are constantly transmitting logs with the following information:

• Identification number ID
• Battery status
• Tire pressure
• Tire air temperature

During the teach-in drive the system detects a warm tire and calculates a higher tire pressure for inflation than the nominal pressure displayed before starting the drive (cold tire pressure). The difference between the nominal pressure and the actual pressure can now be seen in the tire pressure control menu. The tire pressure must be adjusted again.

When new wheels are fitted, for example during a wheel change in the workshop, the temperature difference between the ambient temperature and the current temperature of the tire (workshop temperature and ambient temperature) must therefore still be taken into account.

Prompts the Central Information Display (CID)

Correct responses must be given for the following prompts in the menu to enter new wheel and tire combinations.

Central Information Display

New wheels can be selected from the tire Settings menu item.

Important note: The nominal pressure displayed must be adjusted if it is only a question of adjusting the tire pressures and no new wheels have been fitted. Resetting the tire pressure (TPM reset) as required on previous vehicles is not necessary. The TPM warning pressures that are currently valid always relate to the nominal pressure displayed in the CID.

The tire type (summer/winter) and the tire size, 17", 18", 19" or 20" can be selected from the tire Settings menu item.

Various combinations of tire and wheel are stored in the tire Selection menu. Find out the correct size on the rear axle of the vehicle and enter it into the Central Information Display (CID).

The Special Approval (different tires) menu item can be used in the following situations:

• When a tire type not listed (special wheel/tire combination) is being used.
• If the customer wishes to have a tire pressure other than that stored by the system for his tire type.

When this function is used, the TPM system has to be reset as before (TPM reset) following a correction of the tire pressures.

Once the appropriate wheel and tire combination has been selected, the max vehicle speed must be specified. The preset values should not be changed by the customer.

Once the modified tire settings have been confirmed, the system loads the new nominal pressures .

The system then displays the modified tire type and the speed range. The new nominal pressures applicable for the front and rear axle are also displayed. The old actual pressures stored have been deleted.

When the drive starts > 20 km/h (> 12 mph), the wheel electronics units transmit their logs.

In the first teach-in stage the tire pressures are merely checked for plausibility and displayed in color.

• Shown in green = tire pressure OK.
• Shown in yellow = tire pressure not OK.

In the second teach-in stage, the various wheel electronics are assigned to the particular wheel on which they are fitted. After successful assignment of the wheel electronics, the actual values can be displayed and compared with the nominal pressure.

In the event of pressure deviations, it is merely necessary to adjust the actual pressure to the nominal pressure. It is not necessary to reset the TPM system (TPM reset).

The nominal pressures displayed must be observed. Failure to do so may result in tire pressure warnings from the Tire Pressure Monitor (TPM) system.

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