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

Instrumentation, Message Center and Warning Chimes

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 (Smart Junction Box) determines that the tire pressure has exceeded the low tire pressure limits, a message is sent to the IC (Instrument Cluster) to turn on the TPMS (Tire Pressure Monitoring System) warning indicator. If a TPMS (Tire Pressure Monitoring System) fault condition exists, the SJB (Smart Junction Box) sends a message to the IC (Instrument Cluster) to flash the TPMS (Tire Pressure Monitoring System) warning indicator. If the TPMS (Tire Pressure Monitoring System) status message is missing for more than 5 seconds, the IC (Instrument Cluster) sets DTC U0140 and flashes the TPMS (Tire Pressure Monitoring System) indicator for approximately 75 seconds then turns on the indicator.

NOTE: If DTC U0140 is set in the SJB (Smart Junction Box), 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 (Tire Pressure Monitoring System) concern

- SJB (Smart Junction Box)

- IC (Instrument Cluster)

PINPOINT TEST AE : THE TPMS (Tire Pressure Monitoring System) WARNING INDICATOR IS NEVER/ALWAYS ON

AE1 CHECK THE TIRE PRESSURE

- Verify that the tire pressure in all tires meets the recommended tire pressures on the vehicle certification label.

Do all the tires meet the recommended tire pressures?

Yes
GO to AE2.

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

AE2 CARRY OUT THE IC (Instrument Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IC (Instrument Cluster) DataLogger.

- Select the TPMS (Tire Pressure Monitoring System) warning indicator (TIRE_PRES) active command. Command the TPMS (Tire Pressure Monitoring System) warning indicator on and off. Observe the TPMS (Tire Pressure Monitoring System) warning indicator.

Does the TPMS (Tire Pressure Monitoring System) warning indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to AE3.

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

AE3 RETRIEVE THE RECORDED DTCs FROM THE IC (Instrument Cluster) SELF-TEST

- Check for recorded IC (Instrument Cluster) DTCs from the self-test.

Are any DTCs recorded?

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

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

No
GO to AE4.

AE4 RETRIEVE THE RECORDED DTCs FROM THE SJB (Smart Junction Box) SELF-TEST

- Check for recorded SJB (Smart Junction Box) DTCs from the self-test.

Are any SJB (Smart Junction Box) DTCs recorded?

Yes
REFER to Body Control Systems.

No
INSTALL a new SJB (Smart Junction Box). TEST the system for normal operation.