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

Instrumentation and Warning Chimes

Pinpoint Test

Pinpoint Test AB: 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) status from the Smart Junction Box (SJB) over the High Speed Controller Area Network (HS-CAN) communication bus. If the TPMS detects a fault condition, the TPMS warning indicator flashes for 30 seconds then turns off until the next ignition cycle. If the TPMS is in TPMS sensor training mode, the TPMS warning indicator flashes continuously until the TPMS sensor training session has ended. Refer to Wheels and Tires. The IC sets DTC U2023 in continuous memory if the TPMS message is missing or the data is invalid for more than 5 seconds and the IC flashes the TPMS warning indicator for 60 seconds and then turns the TPMS warning indicator on.

If the door ajar status message is missing for more than 5 seconds, the IC sets DTC U0140 and turns on the TPMS warning indicator.

This pinpoint test is intended to diagnose the following:

- Tire pressure
- SJB
- IC



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

-------------------------------------------------
AB1 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 AB2.

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

-------------------------------------------------
AB2 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST


- Retrieve the recorded DTCs from the SJB 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
GO to AB3.

-------------------------------------------------
AB3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Retrieve the recorded DTCs from the IC self-test.
- Is DTC U0140 retrieved?

Yes
GO to Pinpoint Test AN. Pinpoint Tests AN: DTC U0140

No
GO to AB4.

-------------------------------------------------
AB4 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 indicator (TPM_IND) active command. Command the TPMS indicator on then off again. Observe the TPMS warning indicator.
- Does the TPMS warning indicator illuminate when commanded on and turn off when commanded off?

Yes
If the TPMS indicator is never on, the system is operating correctly at this time.

If the TPMS indicator is always on, INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.

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

-------------------------------------------------