Tests AB: The Tire Pressure Monitoring System (TPMS) Warning Indicator Is Never/Always On

PINPOINT TEST AB: THE TIRE PRESSURE MONITORING SYSTEM (TPMS) WARNING INDICATOR IS NEVER/ALWAYS ON

AB1-AB2:

AB3-AB5:

Normal Operation
The instrument cluster receives the TPMS status message(s) from the smart junction box (SJB) over the medium speed controller area network (CAN) communication bus lines. If a low tire is detected by the TPMS, the SJB sends a message to the instrument cluster and the instrument cluster 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 and the instrument cluster flashes the TPMS warning indicator. If the TPMS status message is invalid or missing for more than 5 seconds, the instrument cluster flashes the TPMS warning indicator for 75 seconds then turns the indicator on steady.

Possible Causes
- TPMS concern
- SJB
- Instrument cluster