Instrument Cluster (Ic) Indication

The warning indications to the driver are common on all vehicles fitted with TPMS. Warnings are conveyed by an amber Light Emitting Diode (LED) warning indicator and a text message displayed in the message center.

The TPMSCM passes system status information to the IC on the HS CAN powertrain system bus. The IC converts this data into illumination of the warning indicator and the display of an appropriate message.

When the ignition is switched on, the warning indicator is illuminated for 3 seconds for a bulb check.

NOTE: If the vehicle is not fitted with the TPMS, the warning indicator will not illuminate.

NOTE: The IC checks, within the 3 second bulb check period, for a HS CAN powertrain system bus message from the TPMSCM. During this time the TPMSCM performs internal tests. The warning indicator will be extinguished if the TPMSCM does not issue a fault message or tire pressure warning message.

If a TPMS fault warning message is detected by the IC at ignition on, the warning indicator will flash for 75 seconds after the 3 second bulb check period and then remain permanently illuminated.

If a tire pressure warning message is detected by the IC at ignition on, the warning indicator will extinguish briefly after the 3 second bulb check period, before re-illuminating to indicate a tire pressure warning.

The following table shows the warning indicator functionality for given events:

EVENT	INSTRUMENT CLUSTER INDICATIONS
Low pressure warning limit reached in one wheel	Warning indicator illuminated. 'CHECK ALL TIRE PRESSURES FRONT/REAR RIGHT/LEFT LOW' message displayed and applicable tire highlighted on display.
Low pressure warning limit reached in more than one wheels in low speed mode (only if programmed or learning)	Warning indicator illuminated. 'CHECK ALL TIRE PRESSURES' message displayed and applicable tire highlighted on display.
TPMS fault	Warning indicator flashes for 75 seconds and is then permanently illuminated. The flash sequence repeats after each ignition on cycle. 'TIRE PRESSURE MONITORING SYSTEM FAULT' message displayed.
No transmission from a specific tire pressure sensor or Specific tire pressure sensor fault	Warning indicator flashes for 75 seconds and is then permanently illuminated. The flash sequence repeats after each ignition on cycle. 'FRONT/REAR RIGHT/LEFT TIRE NOT MONITORED' message displayed and applicable tire highlighted on display.
No transmission from more than one tire pressure sensor or more than one tire pressure sensor fault	Warning indicator flashes for 75 seconds and is then permanently illuminated. The flash sequence repeats after each ignition on cycle. 'TIRE PRESSURE MONITORING SYSTEM FAULT' message displayed and applicable tire highlighted on display.
HS CAN powertrain system bus signals missing	Warning indicator flashes for 75 seconds and is then permanently illuminated. The flash sequence repeats after each ignition on cycle. 'TIRE PRESSURE MONITORING SYSTEM FAULT' message displayed.
Vehicle enters high speed mode and high speed low pressure warning limit reached (only available in certain markets)	Warning indicator illuminated. 'TIRE PRESSURE TOO LOW FOR HIGH SPEED' message displayed and applicable tire highlighted on display.