Pinpoint Test P: The Tire Pressure Monitoring System (TPMS) Warning Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Test P: The Tire Pressure Monitoring System (TPMS) Warning Indicator Is Never/Always On
Normal Operation
The Instrument Cluster (IC) receives the Tire Pressure Monitoring System (TPMS) messages from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus. If the SJB determines that the tire pressure has exceeded the low tire pressure limits, a message is sent to the IC to turn on the TPMS warning indicator. If a TPMS fault condition exists, the SJB sends a message to the IC to flash the TPMS warning indicator.
If the TPMS status message is missing or deemed invalid for less than 5 seconds, the IC defaults the TPMS warning indicator to the last setting (on or off), based upon the last known good TPMS status message received.
If the TPMS status message is missing for more than 5 seconds, the TPMS warning indicator flashes for approximately 75 seconds then turns the indicator on steady.
If the message is deemed invalid for more than 5 seconds, the IC sets DTC U2023 and flashes the TPMS warning indicator for approximately 75 seconds then turns the indicator on steady.
NOTE: If DTC U0140 is set in the IC, other symptoms may also be present such as high beam indicator, RH/LH turn indicators, instrument panel backlighting, and door ajar indication.
This pinpoint test is intended to diagnose the following:
- Tire pressure
- TPMS concern
- SJB
- IC
PINPOINT TEST P: THE TPMS WARNING INDICATOR IS NEVER/ALWAYS ON
