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WHEEL AND TIRES 02–12–9 02–12 Identification Code Recognition Function • Since the identification codes of wheel units mounted on the vehicle have been configured in the instrument cluster, the instrument cluster can verify the identification codes sent from the wheel units against the • When the received identification code agrees with the configured identification code, data such as tire pressure is updated according to the received signal. When the identification code does not agree, that signal data is Tire Pressure Determination And Warning Function • The instrument cluster determines the tire pressure status of each wheel by comparing tire pressure data received from the wheel units with the preset values in the instrument cluster. • If a malfunction is detected in the received signals, the instrument cluster flashes the TPMS warning light to notify the driver of a tire malfunction. • The tire pressure monitoring function is classified into the two low-pressure and flat tire determinations. • The informing/warning of an abnormal tire pressure determination takes precedence over the informing/ warning of a missing signal or malfunction determination. Low-pressure determination • When tire pressure data is lower than the detection value configured in the instrument cluster, the instrument cluster determines that the tire for that wheel unit has low tire pressure. — If low tire pressure is determined when the ignition is on, the TPMS warning light is illuminated and sounds the TPMS warning buzzer for 3 s to alert the driver. — If low tire pressure is determined when the ignition is off, the instrument cluster performs an open-circuit check *1 on the TPMS warning light and flat tire warning light after the ignition is turned on, and then illuminates the TPMS warning light and flat tire warning light and sounds the TPMS warning buzzer and flat • The low-pressure determination is retained until tire pressure data from the applicable wheel unit returns to the preset value. — If tire pressure data that is higher than the specified value is received when the ignition is on, the TPMS control module turns out the TPMS warning light. — If tire pressure data that is higher than the specified value is received when the ignition is off, the module performs an open-circuit check *1 on the TPMS warning light after the ignition is turned on and turns out the TPMS warning light. *1 : The TPMS control modules turns on the TPMS warning light for 3 s after the ignition is turned on for an open-circuit check of the TPMS warning light. TPMS PRESET SPECIFIED LOW LIMIT DETECTED TPMS ON ON 3 S OFF OFF CHU0212S004 |