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 tire pressure warning indicator alerts the driver that one or more of the tires on the vehicle has low tire pressure or is flat. The Tire Pressure Monitoring System (TPMS) system consists of a tire pressure sensor and a transmitter located on each tire. The Instrument Cluster (IC) receives the TPMS status message(s) from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus lines. If a low tire is detected by the TPMS, the SJB sends a message to the IC and the IC turns on the TPMS warning indicator. If there is a problem or fault detected in the TPMS, the SJB sends the appropriate message to the IC and the IC flashes the TPMS warning indicator. If the TPMS status message is invalid or missing for more than 5 seconds, the IC flashes the TPMS warning indicator for 75 seconds then turns the indicator on steady.
This pinpoint test is intended to diagnose the following:
- 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 Vehicle/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 RETRIEVE THE RECORDED DTCs FROM BOTH THE IC CONTINUOUS AND ON-DEMAND SELF-TESTS
- Check for recorded IC DTCs from the continuous and on-demand self-tests.
- Is DTC B2477 recorded?
Yes
REFER to Information Bus to carry out the Programmable Module Installation (PMI) for the IC. Programming and Relearning
No
GO to AE3.
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AE3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND SJB SELF-TESTS
- Check for recorded DTCs from the SJB continuous and on-demand self-tests.
- Are any SJB DTCs retrieved?
Yes
REFER to Body Control Systems.
No
GO to AE4.
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AE4 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC tire pressure warning indicator (TIRE_PRES) active command on then off again while monitoring the TPMS warning indicator.
- Does the TPMS warning indicator turn on when commanded on and turn off when commanded off?
Yes
INSTALL a new PCM. 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.
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