Pinpoint Test T: The Tire Pressure Monitoring System (TPMS) Warning Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
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 determines that the tire pressure has exceeded the low tire pressure limits, a message is sent to the IPC to turn the TPMS warning indicator on. If a TPMS fault condition exists, the SJB sends a message to the IPC to flash the TPMS warning indicator for 75 seconds then the IPC turns the indicator on steady. If the TPMS is in the TPMS sensor training mode, the SJB sends a command to the IPC to flash the TPMS warning indicator throughout the procedure. If the TPMS status message is missing or deemed invalid for less than 5 seconds, the IPC defaults the TPMS warning indicator to the last setting (on or off), based upon the last known good 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, the IPC sets DTC U0430:68 and flashes the TPMS warning indicator for approximately 75 seconds then turns the indicator on steady.
NOTE: If DTC U0140:00 is set in the SJB, 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 concern
- SJB
- IPC
PINPOINT TEST T: THE TPMS 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. Refer to Vehicle Identification Codes.
- 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 INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC TPMS warning indicator (TPMWARN_LMP) active command. Command the TPMS warning indicator on and off while observing the TPMS warning indicator.
- Does the TPMS warning indicator illuminate when commanded on and turn off when commanded off?
Yes
GO to T3.
No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
-------------------------------------------------
T3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST
- Check for recorded DTCs from the continuous IPC 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 SELF-TEST
- Check for recorded DTCs from the SJB self-test.
- Are any DTCs recorded?
Yes
REFER to Body Control Systems for correct navigation of the DTC.
No
If the TPMS warning indicator is never on, the system is operating normally.
If the TPMS warning indicator is always on, INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.
-------------------------------------------------