TPMS Instrument Cluster Warnings

1.0  TPMS warning message on instrument cluster root cause: various causes, as follows:

Turn the ignition on and look at the Instrument Cluster.

• Does the TPMS ISO symbol flash for 72 seconds, and then stay on permanently: Yes go to section 2.0  .
• Is the TPMS ISO Symbol illuminated permanently on the instrument cluster: Yes go to section 1.1  .

If the TPMS ISO symbol does not illuminate: There is no fault or problem present on the vehicle at this time.

• Ask the customer if they have used a spare wheel fitted with a rubber valve, as this will cause a TPMS symptom fault to be displayed, this is expected behavior, and there is no fault with the TPMS system. The use of a spare wheel is described in the vehicle handbook.
• Ask the customer if the instrument cluster displayed one or more wheels at 0 pressure. If yes then section 1.2  .
• Ask the customer if they saw a warning TPMS message. If yes then section 1.3  .
• Ask the customer if the TPMS fault message came on during a drive, and if the message cleared during a drive cycle. If the customer does indicate this happened, ask the customer if they have used additional accessories in the vehicle such as: USB chargers, insurance cameras, DC-DC converters, cool boxes, satellite navigation and radar detectors when the TPMS fault light came on. If the answer is yes, ask the customer to remove the items, and see if the TPMS fault light does not come on, during the next drive cycles.

1.1  Low pressure warnings.

When the TPMS ISO symbol is on all the time, or comes on during a journey, the TPMS system has detected that one or more tires are below the 80% requirement of the required pressure. The required pressure in the tire changes due to the temperature of the air inside the tire, being heated by the tire movement.

The instrument cluster will display a graphic of the vehicle showing which tire(s) are below the 80% of the required pressure. If only one wheel is low pressure then that wheel will be highlighted in yellow showing the actual pressure and the Recommended Cold Pressure (RCP) to inflate to.

The message to check all tires is because if the tire has naturally lost air, then the other three tires will also be close to the threshold to set the warning.

Using the instrument cluster menu, (ignition on), use the menu and arrow keys on the steering wheel to navigate to the TPMS menu, and select the pressure check option, and view the pressures of the tires, add air to the tires as required. The correct pressure is shown in the pressure menu, on the instrument cluster. The recommended cold pressure is also shown on the tire label at the bottom of the B-pillar.

The instrument cluster should update as air is being placed into the tires. If the instrument cluster does not update, then drive the vehicle for 3 minutes above 15Mph. This will make sure the RF signals from the TPMS wheel units are received.

1.2  Instrument cluster displays one or more tires at 0 pressure without ISO TPMS symbol illuminated.

If the instrument cluster is showing one or more tires at 0 pressure, then inflate the tire by 300kPa and check the instrument cluster to see if the tire pressure has updated. If not then drive the vehicle for 8 minutes above 20Kph for the TPMS sensors to localize.