Detecting seeping pressure loss, function - GF40.15-P-2001T

MODEL 211 up to 31.5.05 

with CODE (475) Tire pressure monitor 

except CODE (494) USA version 

except CODE (498) Japan version 

MODEL 211 up to 30.6.05 

with CODE (475) Tire pressure monitor 

with CODE (494) USA version 

with CODE (498) Japan version 

Function 

The operating condition "soft warning" (reminder, "yellow" display) is marked by a minimum tire pressure, at which driving safety continues to be guaranteed. Via the multifunction display (A1p13) in the instrument cluster (A1) the driver is urged to correct the tire inflation pressure at the next opportunity. A "soft warning" is triggered if the tire inflation pressure as rated by temperature is > 0.2 bar and < 0.4 bar less than the stored specified pressure. This takes place for the first time in the next ignition sequence and is displayed for approx. 30 seconds. The driver is therefore requested to check the tire inflation pressures and correct them if necessary and then reactivate the tire pressure monitor (TPM) system.

If the temperature-weighted tire inflation pressure is > 0.4 bar under the stored specified pressure, a "hard warning" ("red" display) follows.

The "hard warning" is only displayed in the same ignition sequence. A "soft warning" is displayed in the next ignition sequence. If the system is not reactivated, the "soft warning" is repeated for approx. 30 seconds each time the engine is started and then goes out again.

The driver is advised to stop and check the condition of the tires immediately. The driver is responsible for deciding whether to continue driving at low speed to the next specialist workshop or whether a repair (fitting the spare wheel or using TIREFIT) is necessary on site.

As of 1.6.04 in parallel with the "hard warning" the tire pressure monitor warning lamp (A1e66) in the instrument cluster (A1) is actuated. This only goes out after the system is reactivated.

Tire pressure monitor control unit, location/task/design	GF40.15-P-3001T
Wheel antenna, location/function	GF40.15-P-3101A
Wheel sensor, location/design/function	GF40.15-P-3201A
TPM system activation button, location/task	GF40.15-P-3603T