GF40.15-P-0001-02SX Tire Pressure Monitor (RDK) Activation
GF40.15-P-0001-02SX Tire pressure monitor (RDK) activation
- with CODE (475) Tire pressure monitor (siemens) [model 216.3, 221.1]
- with CODE (494) USA version [model 216.3]
Component Identification:
The tire pressure monitor (TPM) assists the driver with the permanent check of the correct tire inflation pressure.
The TPM system can be reactivated in the following cases:
^ after a tire pressure change (e.g. by refilling)
^ After each wheel or tire change
^ after assembling new wheels or tires
The adjusted air pressure values in the TPM [RDK] control unit (N88) are stored as specified monitoring values.
In normal application cases (wheel exchange or the driver adjusts new pressure values) filling detection automatically determines new specified values.
The tire inflation pressure to be monitored can be determined manually by the driver by "Reactivating" the tire pressure monitor via the operating menu in the multifunction display. The temperature-compensated pressure thresholds for the warnings are established by means of pressure values at the instant of reactivation.
Manual reactivation is only planned as a stopgap solution for critical application cases if automatic filling detection fails.
Description of operation
The TPM system is permanently operational is not actively controlled by the driver. Each time the interior CAN is woken up by "terminal 15 ON" the TPM [RDK] control unit carries out a re initialization and starts to transmit messages to the instrument cluster (A1).
Condition: adopting current pressure values as new specified values:
^ Pressure values filtered for 3 minutes
^ Detection of the wheel in question awaited
^ Plausibility check of pressure values carried out
^ Determination of specified pressure values carried out after a positive plausibility check
Conditions for reinitializing filling detection:
^ "terminal 15 ON" after more than 3 minutes idle time
^ TPM wheel sensor reports a pressure change when the vehicle is stationary
^ New wheels on the vehicle in question found after the start of the journey
Conditions for filling detection:
^ Filling detection started
^ No pressure change (temperature compensated) of more than 0.1 bar (max/min value comparison) within monitoring period
^ Tire pressures are above the minimum pressure specific to the model serial productions
Manual reactivation
A reactivation of the TPM system can be triggered via the left multifunction steering wheel button group (S110).
A reactivation is carried out if the pressure values of the tires are plausible for the TPM [RDK] control unit both individually and in relation to each other and are above the minimum pressure specific to the model serial productions.
A feedback "Tire pressure monitor reactivated" takes place. The current tire pressures are taken over as specified values on an axle by axle basis.
In the event of a manual reactivation of the TPM system the filling detection is also restarted.
Start manual reactivation:
^ Adjust tire pressure correctly in each wheel
^ Circuit 15 ON
^ Use the system selection button to select the "Service" menu
^ Use the scroll forward/back button to select tire pressure
^ Confirm with OK button
The current tire pressure of the individual wheels appears or the message "Tire pressure display appears after driving for a few minutes" appears.
System messages with manual reactivation after pressing the OK button, shown on model 221 up to 31.8.06
Request to adopt current pressures as guidance values
^ Scroll with the scroll forward/back button until the corresponding message is displayed
^ Confirm with OK button
System message after adopting the pressures as new guidance values, shown on model 221 up to 31.8.06
Concluding system message, shown on model 221 up to 31.8.06
The current tire pressures are adopted as guidance values after driving for a few minutes.
System message with tire pressure monitor running, shown on model 221 up to 31.8.06
As of this instant the TPM system monitors the (newly) adjusted air pressure values of all rotating wheels. The TPM system has stored the current tire pressure as a new reference value.