Pinpoint Test P: The Tire Pressure Monitoring System (TPMS) Warning Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
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 for 75 seconds then the IC turns the indicator on steady. If the TPMS is in the TPMS sensor training mode, the SJB sends a command to the IC 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 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
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P1 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 P2.
No
CORRECT the tire pressures. TEST the system for normal operation.
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P2 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC TPMS warning indicator (TIRE_PRES) active command. Command the TPMS warning indicator on and off. Observe the TPMS warning indicator.
- Does the TPMS warning indicator illuminate when commanded on and turn off when commanded off?
Yes
GO to P3.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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P3 RETRIEVE THE RECORDED DTCs FROM IC SELF-TEST
- Check for recorded IC DTC from the self-test.
- Are any DTCs recorded?
Yes
For DTC U0140, GO to Pinpoint Test AU. Pinpoint Tests AU: DTC U0140
For DTC U2472, GO to Pinpoint Test BB. Pinpoint Tests BB: DTC U2472
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to P4.
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P4 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check for recorded SJB DTCs from the self-test.
- Are any DTCs recorded?
Yes
REFER to the Diagnostic Trouble Code (DTC) Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart
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.
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