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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Tire Pressure Monitoring System) >> Diagnostic Information and Procedures >> Low Tire Pressure Indicator Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Low tire pressure in one or more tires is indicated by a continuously illuminated tire pressure monitor indicator icon after the instrument cluster bulb check is completed. If equipped with a driver information center, a tire pressure low-add air message will also be displayed.

When a tire pressure monitor DTC is set, the tire pressure monitor indicator icon will flash for approximately 1 min after the instrument cluster bulb check is completed and then remains illuminated. If equipped with a driver information center, a service tire monitor type message will also be displayed.

  1. Adjust all tire pressures to the correct pressure. Refer to Vehicle Certification, Tire Placard, and Anti-Theft Label .
  2. Drive the vehicle over 40 km/h (25 mph) for greater than 2 min.
  3. Verify the low tire pressure indicator is OFF.
    • If the low tire pressure indicator is ON 
    1. Perform the Tire Pressure Indicator Sensor Learn .
    2. Compare the tire pressure sensor values to a digital air gauge, if the difference of 10% is noticed then inspect for damage or contamination.
    3. Verify the Tire Type and Pressure selections are setup correctly with scan tool. Refer to the Vehicle Certification, Tire Placard, and Anti-Theft Label , Control Module References .
      • If the BCM Tire Type and Pressure selections are incorrect 

        Input the proper placard values for the vehicle with the SPS then drive the vehicle over 40 km/h (25 mph) for greater than 2 min. Refer to the K9 Body Control Module Control Module References .

      • Go to next step: If the BCM Tire Type and Pressure selections are correct 
    4. Ignition ON / Vehicle In Service Mode
    5. Verify the low tire pressure monitor indicator icon turns ON and OFF when turning the ignition key on.
      • If the low tire pressure monitor icon does not turn ON and OFF 

        Replace the P16 Instrument Cluster.

      • Go to next step: If the low tire pressure monitor icon turns ON and OFF 
    6. All OK
    • Go to next step: If the tire pressure indicator is OFF 
  4. All OK
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