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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

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

NOTE: If DTC U0140 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 indication.

This pinpoint test is intended to diagnose the following:

- Tire pressure
- TPMS concern
- SJB
- IC


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

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AE1 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 AE2.

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

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AE2 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 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 AE3.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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AE3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST

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

Yes
For DTC U0140, GO to Pinpoint Test BC. Pinpoint Tests BC: DTC U0140

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
GO to AE4.

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AE4 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST

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

Yes
REFER to Multifunction Electronic Modules Testing and Inspection.

No
INSTALL a new SJB. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.

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