Tire Pressure Monitoring System Usage, Direct System

Tire Pressure Monitoring System Usage, Direct System

Function:

The tire pressure monitoring system is actuated by using the tire pressure monitoring button (E226).

The system monitors the tire pressure that was set for monitoring in each of the four tires.

- The tire pressures must first be checked, corrected and stored using the tire pressure monitoring button.

- Then check and correct the tire pressure for the tires on the vehicle (including spare tire) according to the specifications on the sticker on the fuel filler flap/B-pillar.

Tire Pressure Monitoring Active

If the TPMS detects a loss of pressure in one or more tires, it notifies the driver by switching the TPMS warning lamp in the instrument cluster on continuously. A tire pressure warning symbol with the text "Check tire pressure" also appears in the instrument cluster driver information system. In this case, the tire pressures must be checked (according to the specifications on the label on the fuel tank door/B-pillar). If the tire pressure is very different in one or more tires, check that tire for damage or foreign objects. Replace the tire if necessary. Refer to => [ Tires, Changing, with Tire Pressure Monitoring System ] Tires, Changing, With Tire Pressure Monitoring System.

- If the cause of the tire pressure warning has been corrected: Correct and store the tire pressures using the tire pressure monitoring button.

System Malfunction in the TPMS

A system malfunction is stored in the DTC memory for the tire pressure monitoring control module (J502). If a malfunction occurs or there is already one present, this is indicated when the ignition is switched on by the yellow indicator lamp in the instrument cluster blinking for 1 minute and then staying on. Indicator lamp cannot be turned off by pressing tire pressure monitoring button. The TPMS warning lamp in the instrument cluster comes on and "Tire Pressure System Fault" appears. If there is a Diagnostic Trouble Code (DTC) memory entry, connect vehicle diagnostic, testing and information system (VAS 5051) and select "Guided Fault Finding".

Coding Tire Pressure Monitoring Control Module

If tire pressure monitoring control module is replaced, new control module must be coded. To do this, proceed as follows.

- Connect (VAS 5051 A) perform vehicle-specific entry into Guided Fault Finding and select go to button "function/component selection".

Then

- "Chassis (Repair group 01; 40 - 49)"

- "Tire pressure monitoring (Repair group 01; 44)"

- "01 - On Board Diagnostic (OBD) capable systems"

- "65 - Tire pressure monitoring J502"

- "J502 - Tire Pressure Monitoring Control Module, functions"

- "65 - Replacing control module (repair group 44)"

Tire pressure saving must be initiated after every desired change to the specified pressures.

Save Tire Pressures

The correct saving of the specified values in the basic requirement for dependable tire pressure monitoring.

After each change to the tires, the tire pressure monitoring button must be pressed for approximately 5 seconds with the ignition turned on and the vehicle standing until a signal tone is heard and the yellow "system malfunction diagram" in the instrument cluster blinks several times. Blinking several times confirms the calibration procedure and the readapting of the tire pressures.

The procedure for saving the tire pressures must be initiated each time the tire specified pressures are changed. The procedure takes place while driving.

Store when Changing a Tire or Replacing a Tire Pressure Sensor

Adapting the tire pressure sensors is a basic requirement for the tire pressure monitoring system to function properly.

Each time a tire is changed or a tire pressure sensor is replaced, the tire pressure sensor must be pressed for approximately 5 seconds with the ignition turned on and vehicle standing still until a signal tone is heard and the yellow "system malfunction diagram" in the instrument cluster blinks several times.

If the tire pressure monitoring button is not pressed, the system learns the new sensors but still activates the indicator lamp to request active operation.

The vehicle must now stand for 20 minutes and then be driven on a 10-minute adaptation drive at speeds greater than 25 km/h.

If the standing time is not followed, control module is not in learning mode so system recognizes a malfunction and can only automatically learn wheel electronics after standing 20 minutes.