Instrument cluster indication (Freelander 2)

Pos.	Spare part number	Name
1	-	Low Tire Pressure Warning Light
2	-	Message Center

The driver alert system is the same on all vehicles equipped with a tire pressure monitoring system: The driver receives a warning from the low tire pressure warning lamp along with a corresponding text message in the message center display.

The TPMS software in the CJB transmits system status information to the instrument cluster via the medium speed CAN bus. The instrument cluster then interprets this data and illuminates the warning lamp and displays an appropriate message.

When the ignition is turned on, the control light comes on for 3 seconds for verification.

NOTE: On vehicles not equipped with a tire pressure monitoring system, this indicator light will not illuminate.

During the three seconds that the lamp check lasts, the instrument cluster checks for a message sent by the TPMS system via the CAN bus. During this time, the system performs an internal check and initializes the CAN bus. The indicator lamp will go out if the TPMS software does not issue a malfunction message or a tire pressure warning message.

If the instrument cluster receives a TPMS fault warning message with the ignition on, after a 3-second check, the indicator light will flash for 75 seconds and then remain on continuously.

If the instrument cluster receives a tire pressure warning message while the ignition is on, after a 3-second check the indicator lamp will go out briefly before coming back on to indicate a tire pressure warning.

The table below illustrates the operation of the indicator lamp for these situations:

Situation	Instrument cluster indication
Low pressure limit reached while driving at high speed	The indicator lamp comes on. The message "TYRE PRESSURES LOW FOR SPEED" appears.
The low pressure limit has been reached in one of the wheels while driving at low speed	The warning light comes on. The message "CHECK ALL TYRE PRESSURES XX LOW" appears.
Low pressure limit reached in more than one wheel while driving at low speed	The warning light comes on. The message "CHECK ALL TYRE PRESSURES" appears.
The air pressure limit in one of the "working" wheels has been reached, the location of the wheel is not determined by the TPMS system	The warning light comes on. The message "CHECK ALL TYRE PRESSURES" appears.
The air pressure limit of the spare tire (if equipped) has been reached	The indicator light stays on for 20 seconds and comes on again with each subsequent ignition cycle. The message "CHECK SPARE TYRE PRESSURE" appears in the message center display.
TPMS malfunction	The indicator light flashes for 75 seconds and then remains on continuously. The message "TYRE PRESSURE MONITORING SYSTEM FAULT" appears.
No transmission from a specific tire pressure sensor or a specific tire pressure sensor malfunction	The indicator light flashes for 75 seconds and then remains on continuously. The message "XX TYRE PRESSURE NOT MONITORED" appears for 20 seconds.
No transmission from more than one tire pressure sensor or malfunction of more than one tire pressure sensor	The yellow indicator light flashes for 75 seconds and then remains on continuously. The message "TYRE PRESSURE MONITORING SYSTEM FAULT" appears for 20 seconds.
No CAN signals	The indicator lamp flashes for 75 seconds and then remains on continuously. The message "TYRE PRESSURE MONITORING SYSTEM FAULT" appears for 20 seconds.