Pinpoint Test 1: TPMS Indicator On Continuously And Message Center (If Equipped) Displays Low Tire Pressure

PINPOINT TEST 1: TPMS INDICATOR ON SOLID AND MESSAGE CENTER (IF EQUIPPED) DISPLAYS LOW TIRE PRESSURE

Normal Operation

The tire pressure monitoring system (TPMS) monitors the air pressure of all 4 road tires. The wheel-mounted tire pressure sensors transmit via radio frequency signals, to the smart junction box (SJB). TPMS functionality is integral to the SJB. These transmissions are sent approximately every 60 seconds when the vehicle speed exceeds 32 km/h (20 mph). The TPMS function (integral to the SJB) compares each tire pressure sensor transmission against a low-pressure limit. If it has been determined that the tire pressure has fallen below this limit, the SJB communicates this on the vehicle communication bus to the instrument cluster. The instrument cluster then illuminates the TPMS indicator and displays the appropriate message(s) in the message center (if equipped).This symptom can also be caused by a spare tire currently being used in place of a road tire. Make sure that the spare tire is not currently in use. The sensors do not need to be trained following a tire rotation.On vehicles with different front and rear tire pressures, if the sensors are not trained following a tire rotation, this symptom will also be present. Advise the customer that on vehicles with different front and rear tire pressures, the sensors must be trained as directed in the Owner's Literature.

Possible Causes
- Low air pressure in tire(s)
- Tire pressure sensor(s)

Diagnostic Procedure

NOTE:Use only the Digital Tire Gauge any time tire pressures are measured to be sure that accurate values are obtained.
NOTE:If a warranty case is opened for an actual TPMS fault, document and include the actual tire pressure data in all warranty communications.