Pinpoint Test X: The Tire Pressure Monitoring System (TPMS) Warning Indicator Is Never/Always On

Instrumentation and Warning Chimes

Pinpoint Test X: 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 TPMS (Tire Pressure Monitoring System) module over the Medium Speed Controller Area Network (MS-CAN) communication bus. If the TPMS (Tire Pressure Monitoring System) module determines that the tire pressure has exceeded the low tire pressure limits, a message is sent to the IC (Instrument Cluster) to turn the TPMS (Tire Pressure Monitoring System) warning indicator on. If a TPMS (Tire Pressure Monitoring System) fault condition exists or if the TPMS (Tire Pressure Monitoring System) is in the tire training mode, the TPMS (Tire Pressure Monitoring System) module sends a message to the IC (Instrument Cluster) to flash the TPMS (Tire Pressure Monitoring System) warning indicator.

If the TPMS (Tire Pressure Monitoring System) status message is missing or invalid for less than 5 seconds, the IC (Instrument Cluster) defaults the TPMS (Tire Pressure Monitoring System) warning indicator to the last setting (on or off), based upon the last known good message received. If the TPMS (Tire Pressure Monitoring System) status message is missing for more than 5 seconds, the IC (Instrument Cluster) sets DTC U0127 and flashes the TPMS (Tire Pressure Monitoring System) indicator for approximately 75 seconds then turns on the indicator steady. If the TPMS (Tire Pressure Monitoring System) status message is invalid for more than 5 seconds, the IC (Instrument Cluster) sets DTC U2023 and flashes the TPMS (Tire Pressure Monitoring System) indicator for approximately 75 seconds then turns on the indicator steady.

This pinpoint test is intended to diagnose the following:

- Tire pressure

- TPMS (Tire Pressure Monitoring System) concern

- TPMS (Tire Pressure Monitoring System) module

- IC (Instrument Cluster)

PINPOINT TEST X : THE TPMS (Tire Pressure Monitoring System) WARNING INDICATOR IS NEVER/ALWAYS ON

X1 CHECK THE TIRE PRESSURE

- Verify that the tire pressure in all tires meets the recommended tire pressures on the vehicle certification label.

Do all the tires meet the recommended tire pressures?

Yes
GO to X2.

No
CORRECT the tire pressures. TEST the system for normal operation.

X2 CARRY OUT THE IC (Instrument Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IC (Instrument Cluster) DataLogger.

- Select the IC (Instrument Cluster) TPMS (Tire Pressure Monitoring System) warning indicator (TIRE_PRES) active command. Command the TPMS (Tire Pressure Monitoring System) warning indicator on and off. Observe the TPMS (Tire Pressure Monitoring System) warning indicator.

Does the TPMS (Tire Pressure Monitoring System) warning indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to X3.

No
INSTALL a new IC (Instrument Cluster). REFER to Instrument Cluster (IC) . TEST the system for normal operation.

X3 RETRIEVE THE RECORDED DTCs FROM THE IC (Instrument Cluster) SELF-TEST

- Check for recorded IC (Instrument Cluster) DTCs from the self-test.

Are any DTCs recorded?

Yes
For DTC U0127, GO to Pinpoint Test AM. Pinpoint Test AM: DTC U0127

For all other DTCs, REFER to DTC Charts. Instrument Panel, Gauges and Warning Indicators

No
GO to X4.

X4 RETRIEVE THE RECORDED DTCs FROM THE TPMS (Tire Pressure Monitoring System) MODULE SELF-TEST

- Check for recorded TPMS (Tire Pressure Monitoring System) module DTCs from the self-test.

Are any DTCs recorded?

Yes
REFER to Wheels and Tires.

No
INSTALL a new TPMS (Tire Pressure Monitoring System) module. TEST the system for normal operation.