Tire Fill Alert Malfunction

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description Instead of just warning the driver via the DIC when the vehicle tires are low, this feature provides audible and visual indication to the driver when they are putting air into the low tire to aid in achieving optimal tire pressure. The feature begins when the tire pressure telltale is illuminated for a low tire. When the driver starts to fill the low tire, the vehicle will flash the turn lamp of the corner that is being filled. This will provide feedback to the driver that a fill event is occurring. When the placard tire pressure is achieved, the vehicle will notify the driver with a single, short, horn chirp, similar to the one heard when locking the vehicle. The turn signal lamp of that corner will then stop flashing and become solid for a short period of time. If continuing to fill the tire and overfill occurs, the vehicle will notify the driver by sounding the horn three short chirps. Diagnostic Aids The TPMS will not activate the tire fill alert properly under the following conditions: There is interference from an external device or transmitter. The air pressure from the inflation device is not sufficient to inflate the tire. There is a malfunction in the Tire Pressure Monitoring System. There is a malfunction in the horn or turn signal lamps. The identification code of the Tire Pressure Monitoring System sensor is not registered to the system. The battery of the Tire Pressure Monitoring System sensor is low. Circuit/System Verification

Note

Tire Fill Alert Service Procedure needs to be done consecutively within the same day.

1. Verify all the tire pressure sensors installed on the vehicle are compatible with tire fill alert:

Note

The leading character identifier specified below is when the Sensor ID is read in Hex not Decimal. Aluminum valve stem – scan tool Tire Pressure Sensor Identification parameter begins with 0 or B = Tire fill alert compatible Rubber valve stem – 315 MHz – scan tool Tire Pressure Sensor Identification parameter begins with a 9 = Tire fill alert compatible Rubber valve stem – 433 MHz – scan tool Tire Pressure Sensor Identification parameter begins with a 4 or 8 = Tire fill alert compatible

2. If any tire pressure sensor installed on the vehicle is not compatible with tire fill alert. Replace the appropriate incompatible tire pressure sensor.
3. Check sensors to ensure they are reporting properly.
4. If any of the sensors is not reporting properly, then follow Tire Pressure Monitoring sensor service procedure.
5. While vehicle is parked and in accessory power mode, release air from tire until the Tire Pressure Monitoring System telltale is illuminated.
6. Using a high pressure compressor (flow rate has to be higher than 0.15psi per second), start filling the tire with air.
7. Monitor vehicle corner lights and horn chirps.
8. If tire fill alert works and there is no issue with feature, then stop. If Tire Fill Alert is still not working, proceed to step 8.
9. While vehicle is parked and in accessory power mode, release air from tire until the Tire Pressure Monitoring System telltale is illuminated.
10. Monitor and log the Tire Fill Alert Current state parameter: NonMonitor, Monitor, Active, Achieved. Initial state should be in Monitor Mode.
11. Using a high pressure compressor (flow rate has to be higher than 0.15psi per second), start filling the tire with air.
12. Monitor the scan tool Tire Fill Alert parameter change its state from Monitor to Active to Achieved.
13. If parameter states ARE changing while the tire is being filled with air, and no lights or horn feedback are being issued, then refer to Lighting diagnostics.
14. If parameter states ARE NOT changing while the tire is being filled with air, and no lights or horn feedback are being issued, then refer to Body Control Module diagnostics.