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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test U: 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) warning indicator request from the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN) communication bus. If the BCM determines that the tire pressure has exceeded the low tire pressure limits, a request is sent to the IPC to turn on the TPMS warning indicator. If a TPMS fault condition exists, the BCM sends a request to the IPC to flash the TPMS warning indicator.

If the TPMS status message is missing for more than 5 seconds, the IPC sets DTC U0140:00 and flashes the TPMS indicator for approximately 75 seconds then turns the TPMS indicator on.

NOTE: If DTC U0140:00 sets in the BCM, other symptoms may also be present such as high beam indicator, RH/LH turn indicators, instrument panel backlighting, and door ajar indication inoperative.

This pinpoint test is intended to diagnose the following:

- Tire pressure
- TPMS concern
- BCM
- IPC

PINPOINT TEST U: THE TPMS WARNING INDICATOR IS NEVER/ALWAYS ON

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U1 CHECK THE TIRE PRESSURE

- Verify 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 U2.

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

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U2 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. Observe the TPMS warning indicator.
- Does the TPMS warning indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to U3.

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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U3 RETRIEVE THE RECORDED DTCs FROM IPC SELF-TEST

- Check for recorded IPC DTC from the self-test.
- Are any DTCs recorded?

Yes
For DTC U0140:00, GO to Pinpoint Test BF. For all other DTCs, REFER to DTC Charts. Pinpoint Tests BF: DTC U0140:00

No
GO to U4.

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U4 RETRIEVE THE RECORDED DTCs FROM THE BCM SELF-TEST

- Check for recorded BCM DTCs from the self-test.
- Are any DTCs recorded?

Yes
REFER to the Body Control Module (BCM) DTC Chart in Multifunction Electronic Modules Testing and Inspection.

No
If the TPMS warning indicator is never on, the system is operating correctly at this time. If the TPMS warning indicator is always on, INSTALL a new BCM. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.

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