GF40.15-P-2004TXE | Detecting rapid pressure loss, function | 5.4.05 |
MODEL 219.3 as of 1.6.05
with CODE (475) Tire pressure monitor (Siemens)
except CODE (494) USA version
except CODE (498) Japan version
MODEL 219.3 as of 1.7.05
with CODE (475) Tire pressure monitor (Siemens)
with CODE (494) USA version
with CODE (498) Japan version
Function
If progressive pressure loss is detected during a certain period (gradient) of time while driving, it is assumed that a tire is defective. In this case a warning is issued even before the triggering parameter for the hard warning has been reached. As a rule the warning is issued 60 seconds at the most after the start of a pressure loss of greater than 0.2 bar/min and is shown in the multifunction display (A1p13) in the instrument cluster (A1) as the warning message (red) "Caution, tire defect".
Cancelation condition
The warning can be canceled during the ignition sequence by successful filling detection or manual reactivation. When the engine is switched back on after a leak warning the tire pressure monitor warning lamp (A1e66) in the instrument cluster is initially activated. If there are new pressure values and none of the warning criteria are fulfilled after driving has started the tire pressure monitor warning lamp is switched off and the warning message is canceled. The warning is canceled when filling detection or a manual reactivation is successfully carried out.
On vehicles with code (494) USA version, it is only possible to reactivate the TPM system manually.
Referenced documents
- gf4015p5124txe Tire pressure monitor control unit, component description
- gf4015p5125txe Wheel antenna, component description
- gf4015p5126txe Wheel sensor, component description
- gf4015p5127txe System activation button, component description