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

Instrumentation, Message Center and Warning Chimes

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

Normal Operation

The Instrument Panel Cluster (IPC) 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 (Smart Junction Box) determines that the tire pressure has exceeded the low tire pressure limits, a message is sent to the IPC (Instrument Panel Cluster) to turn the TPMS (Tire Pressure Monitoring System) warning indicator on. If a TPMS (Tire Pressure Monitoring System) fault condition exists, the SJB (Smart Junction Box) sends a message to the IPC (Instrument Panel Cluster) to flash the TPMS (Tire Pressure Monitoring System) warning indicator for 75 seconds then the IPC (Instrument Panel Cluster) turns the indicator on steady. If the TPMS (Tire Pressure Monitoring System) is in the TPMS (Tire Pressure Monitoring System) sensor training mode, the SJB (Smart Junction Box) sends a command to the IPC (Instrument Panel Cluster) to flash the TPMS (Tire Pressure Monitoring System) warning indicator throughout the procedure. If the TPMS (Tire Pressure Monitoring System) status message is missing or deemed invalid for less than 5 seconds, the IPC (Instrument Panel 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 TPMS (Tire Pressure Monitoring System) warning indicator flashes for approximately 75 seconds then turns the indicator on steady. If the message is deemed invalid, the IPC (Instrument Panel Cluster) sets DTC U0430:68 and flashes the TPMS (Tire Pressure Monitoring System) warning indicator for approximately 75 seconds then turns the indicator on steady.

NOTE: If DTC U0140:00 is set in the SJB (Smart Junction Box), other symptoms may also be present such as high beam indicator, RH/LH turn indicators, instrument panel backlighting, and door ajar indicator.

This pinpoint test is intended to diagnose the following:

- Tire pressure

- TPMS (Tire Pressure Monitoring System) concern

- SJB (Smart Junction Box)

- IPC (Instrument Panel Cluster)

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

T1 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 T2.

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

T2 CARRY OUT THE IPC (Instrument Panel Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

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

- Select the IPC (Instrument Panel Cluster) TPMS (Tire Pressure Monitoring System) warning indicator (TPMWARN_LMP) active command. Command the TPMS (Tire Pressure Monitoring System) warning indicator on and off while observing 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 T3.

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

T3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded DTCs from the continuous IPC (Instrument Panel Cluster) self-test.

Are any DTCs recorded?

Yes
For DTC U0430:68, RETRIEVE and REPAIR all non-network DTCs in the other modules on the network. REFER to Body Control Systems for a list of all DTCs.

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
GO to T4.

T4 RETRIEVE THE RECORDED DTCs FROM THE SJB (Smart Junction Box) SELF-TEST

- Check for recorded DTCs from the SJB (Smart Junction Box) self-test.

Are any DTCs recorded?

Yes
REFER to Body Control Systems for correct navigation of the DTC.

No
If the TPMS (Tire Pressure Monitoring System) warning indicator is never on, the system is operating normally.

If the TPMS (Tire Pressure Monitoring System) warning indicator is always on, INSTALL a new SJB (Smart Junction Box). TEST the system for normal operation.