Tests AE: The Tire Pressure Monitoring System (TPMS) Warning Indicator Is Never/Always On
PINPOINT TEST AE: THE TIRE PRESSURE MONITORING SYSTEM (TPMS) WARNING INDICATOR IS NEVER/ALWAYS ONNormal Operation
The tire pressure warning indicator alerts the driver that one or more of the tires on the vehicle has low tire pressure or is flat. The tire pressure monitoring system (TPMS) system consists of a tire pressure sensor and a transmitter located on each tire. The instrument cluster (IC) receives the TPMS status message(s) from the smart junction box (SJB) over the medium speed controller area network (MS-CAN) communication bus lines. If a low tire is detected by the TPMS, the SJB sends a message to the instrument cluster (IC) and the instrument cluster (IC) turns on the TPMS warning indicator. If there is a problem or fault detected in the TPMS, the SJB sends the appropriate message to the instrument cluster (IC) and the instrument cluster (IC) flashes the TPMS warning indicator. If the TPMS status message is invalid or missing for more than 5 seconds, the instrument cluster (IC) flashes the TPMS warning indicator for 75 seconds then turns the indicator on steady.
This pinpoint test is intended to diagnose the following:
- TPMS concern
- SJB
- Instrument cluster (IC)
