Tire pressure monitor (TPM), messages relevant to operation - GF40.15-P-0001-05T

Model 211 up to 31.05.04

Messages relevant to operation in the multifunction display (A1p13) of the instrument cluster (A1) show the driver that the air pressure in at least one wheel has changed. The messages ensue in red (warning messages) or yellow (information messages).

Messages relevant to operation are stored in the TPM [RDK] control unit (N88) with an event code.

Messages relevant to operation describe a regular operating condition and in the case of a fault there is no reason to exchange system components.

The following messages relevant to operation can occur.

System message

Red warning messages only ensue in the same ignition sequence. The adjacent system message is displayed in the next ignition sequence.

Fig 1: Screen Display - Tire Pressure Monitoring Reactivate

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Information message

Fig 2: Screen Display - Check Tires

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

If the air pressure in one or more tires drops > 0.2 bar and not > 0.4 bar below the specified pressure set by the driver and stored in the TPM [RDK] control unit (N88), this pressure is shown in the multifunction display (A1p13) without the location being specified. The information message appears for the first time in the next ignition sequence. The driver is therefore requested to check the tire inflation pressures, to correct them if necessary and then to reactivate the tire pressure monitor system.

If the system is not reactivated, this information message appears repeated for approx. 30 seconds each time the engine is started and then goes out again.

Warning message

Fig 3: Screen Display - Caution For Tire Defect

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

If a rapid pressure loss (> 0.2 bar/minute) is detected in one or more tires by the tire pressure monitor system, this warning message is shown in the multifunction display (A1p13). Should the pressure loss only occur in one tire, this warning message is displayed for as long as the position is not yet assigned.

The driver is requested to stop the vehicle immediately and to check all the tires for any foreign bodies which may have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Warning message

Fig 4: Screen Display - Check Tires

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

If the air pressure in one or more tires drops >0.4 bar below the specified value set by the driver and stored in the TPM control unit (N88), this is shown in the multifunction display (A1p13). Should the pressure loss only occur in one tire, this warning message is displayed for as long as the position is not yet assigned.

In addition this warning message is displayed when an activation order is rejected by the TPM [RDK] control unit (N88) due to implausible pressure values.

Implausible pressure values:

The tire inflation pressure set by the driver is below the minimum pressure stored in the TPM [RDK] control unit (N88), a tire inflation pressure specific to a model series which must not be dropped below.
The pressure difference of the tire inflation pressures on an axle is > 0.4 bar.

Remedy:

Correct the tire inflation pressures.
Reactivate tire pressure monitor system.

At the plant new vehicles are activated with a higher tire inflation pressure (approx. 3.5 bar). The TPM [RDK] control unit (N88) has stored these tire inflation pressures as specified pressures to be monitored.

By correcting the tire inflation pressure in the workshop this warning message is displayed in this ignition sequence. This is not a system error!

Warning message

If a rapid pressure loss (> 0.2 bar/minute) is detected in the left front tire by the tire pressure monitor system, the adjacent warning message is shown in the multifunction display (A1p13). The driver is requested to stop the vehicle immediately and check the left front tire for any foreign objects which have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Fig 5: Screen Display - Caution Tire Defect (Front Left)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Warning message

If the air pressure in the left front tire drops >0.4 bar below the specified value set by the driver and stored in the TPM control unit (N88), this is shown in the multifunction display (A1p13).

The driver is requested to stop the vehicle immediately and check the left front tire for any foreign objects which have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Fig 6: Screen Display - Check Tires (Front Left)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Warning message

If a rapid pressure loss (> 0.2 bar/minute) is detected in the right front tire by the tire pressure monitor system, the adjacent warning message is shown in the multifunction display (A1p13). The driver is requested to stop the vehicle immediately and check the right front tire for any foreign objects which have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Fig 7: Screen Display - Caution Tire Defect (Front Right)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Warning message

If the air pressure in the right front tire drops >0.4 bar below the specified value set by the driver and stored in the TPM control unit (N88), this is shown in the multifunction display (A1p13).

The driver is requested to stop the vehicle immediately and check the right front tire for any foreign objects which have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Fig 8: Screen Display - Check Tires (Front Right)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Warning message

If a rapid pressure loss (> 0.2 bar/minute) is detected in the left rear tire by the tire pressure monitor system, the adjacent warning message is shown in the multifunction display (A1p13). The driver is requested to stop the vehicle immediately and check the left rear tire for any foreign objects which have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Fig 9: Screen Display - Caution Tire Defect (Rear Left)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Warning message

If the air pressure in the left rear tire drops >0.4 bar below the specified value set by the driver and stored in the TPM control unit (N88), this is shown in the multifunction display (A1p13).

The driver is requested to stop the vehicle immediately and check the left rear tire for any foreign objects which have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Fig 10: Screen Display - Check Tires (Rear Left)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Warning message

If a rapid pressure loss (> 0.2 bar/minute) is detected in the right rear tire by the tire pressure monitor system, the adjacent warning message is shown in the multifunction display (A1p13). The driver is requested to stop the vehicle immediately and check the right rear tire for any foreign objects which have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Fig 11: Screen Display - Caution Tire Defect (Rear Right)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Warning message

If the air pressure in the right rear tire drops >0.4 bar below the specified value set by the driver and stored in the TPM control unit (N88), this is shown in the multifunction display (A1p13).

The driver is requested to stop the vehicle immediately and check the right rear tire for any foreign objects which have penetrated. The spare wheel should be fitted if necessary in the interest of driving safety.

Fig 12: Screen Display - Check Tires (Rear Right)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.