Pinpoint Tests AC: The Tire Pressure Monitoring System (TPMS) Warning Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Test AC: 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 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, DTC U0140:00 sets and the TPMS warning indicator flashes for approximately 75 seconds then turns the indicator on steady. If the message is invalid for more than 5 seconds, the IPC sets DTC U0430:068 (non-hybrid) or U0422:68 (hybrid) 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 AC: THE TPMS WARNING INDICATOR IS NEVER/ALWAYS ON
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AC1 CHECK THE TIRE PRESSURE
- Verify that the tire pressure in all tires meets the recommended tire pressures on the vehicle certification label. Refer to Identification Codes Application and ID.
- Do all the tires meet the recommended tire pressures?
Yes
GO to AC2.
No
CORRECT the tire pressures. TEST the system for normal operation.
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AC2 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 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 AC3.
No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
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AC3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST
- Check for recorded IPC DTCs from the continuous self-test.
- Are any DTCs recorded?
Yes
For DTC U0430:68 or DTC U0422:68, RETRIEVE and REPAIR all non-network DTCs in the SJB and all other modules on the network. REFER to Multifunction Electronic Modules Testing and Inspection for a list of all DTCs.
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to AC4.
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AC4 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 Multifunction Electronic Modules Testing and Inspection for correct navigation of the DTC.
No
INSTALL a new SJB. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.
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