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

Instrumentation, Message Center and Warning Chimes

Pinpoint Test Y: 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 Tire Pressure Monitor (TPM)/Vehicle Security Module (VSM) over the Medium Speed Controller Area Network (MS-CAN) communication bus. If the TPM/VSM determines that the tire pressure has exceeded the low tire pressure limits, a message is sent to the IPC to illuminate the TPMS warning indicator. If a TPMS fault condition exists or if the TPMS is in the tire training mode, the TPM/VSM sends a message to the IPC to flash the TPMS warning indicator.

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, the IPC flashes the TPMS indicator for approximately 75 seconds then turns the indicator on steady. If the TPMS status message is invalid for more than 5 seconds, the IPC sets flashes the TPMS indicator for approximately 75 seconds then turns the indicator on steady.

This pinpoint test is intended to diagnose the following:

- Tire pressure
- TPMS concern
- TPM/VSM
- IPC

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

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Y1 CHECK THE TIRE PRESSURE

- Verify that the tire pressure in all tires meets the recommended tire pressures on the Vehicle Certification (VC) label. Refer to Identification Codes Identification Codes.
- Do all the tires meet the recommended tire pressures?

Yes
GO to Y2.

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

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Y2 CARRY OUT THE IPC DEALER TEST MODE

- Ignition ON.
- Enter the IPC dealer test mode. Scroll through the displays until LED is displayed.
- Does the TPMS warning indicator illuminate?

Yes
GO to Y3

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

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Y3 RETRIEVE THE RECORDED DTCs FROM IPC SELF-TEST

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

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

No
GO to Y4

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Y4 RETRIEVE THE RECORDED DTCs FROM THE TPM/VSM SELF-TEST

- Check for recorded TPM/ VSM DTCs from the self-test.
- Are any DTCs recorded?

Yes
REFER to the Diagnostic Trouble Code (DTC) Chart in Wheels and Tires 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 TPM module Wheels and Tires Service and Repair. TEST the system for normal operation.

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