The Jeep Grand Cherokee is equipped with a helpful feature called Tire Fill Assist, which assists drivers in maintaining proper tire pressure. This feature notifies users when the recommended tire pressure is attained while inflating or deflating a tire. To make the most of this feature, follow the steps outlined in this article.
Ensure your vehicle is parked on a level surface, away from traffic or any hazards that may cause the vehicle to move unexpectedly. Remember, proper tire inflation is crucial for optimal vehicle performance, fuel efficiency, and safety.
Enable Tire Fill Assist
Before using Tire Fill Assist, ensure that it is enabled in the infotainment system settings. Here’s how to access the settings:
- On the center screen of the Jeep Grand Cherokee, locate the bottom category bar and select “Vehicle.”
- Tap the “Settings” option located in the top right corner.
- From the left menu, choose “Safety & Driving Assistance.”
- Scroll down until you find the option “Tire Fill Assist.” Use this setting to turn Tire Fill Assist on or off according to your preference.
Prepare the Vehicle
To activate Tire Fill Assist, ensure that the vehicle is in the correct state. For vehicles equipped with an automatic transmission, the ignition must be in the ON/RUN mode with the transmission in PARK. For vehicles equipped with a manual transmission, apply the parking brake. Note that it is not necessary to have the engine running to enter Tire Fill Assist mode.
Verify Tire Pressure Sensor
While inflating or deflating a tire, the hazard lamps should come on to indicate that the vehicle is in Tire Fill Assist mode. If the hazard lamps do not activate during this process, it may indicate that the Tire Pressure Monitoring System (TPMS) sensor is not in an operable position. In this case, try moving the vehicle slightly forward or backward to rectify the situation.
Understanding the Operation
Horn Chirp for Recommended Pressure
As you inflate a tire, the horn will chirp once to signal when the recommended pressure has been reached. At this point, you should stop filling the tire.
Horn Chirp for Overfilled or Over-Deflated Tires
If a tire becomes overfilled or over-deflated, the horn will chirp three times. Additionally, if you continue to inflate or deflate the tire, the horn will chirp every five seconds as a warning.
Horn Chirp for Proper Inflation Level
Once enough air has been released to reach the proper inflation level, the horn will chirp once again.
Selectable Tire Fill Alert (STFA) – Optional Feature
The Jeep Grand Cherokee also offers the Selectable Tire Fill Alert (STFA) system as an optional feature. This system allows users to select a specific pressure level for the front and rear axle tires, providing feedback during the inflation or deflation process. Here’s how to use it:
Access the STFA Application
Locate the STFA application in the apps menu of the Uconnect system.
Set Desired Pressure Values
Within the STFA application, you can scroll through a pressure range from ≥15 psi to XX in 1 psi increments for each axle setting. XX represents the vehicle’s cold placard pressure values for the front and rear axles, as indicated on the vehicle placard pressure label. You can also save preset pressure values for each axle in the Uconnect system application.
Inflate or Deflate One Tire at a Time
Similar to Tire Fill Assist, the STFA system supports inflating or deflating one tire at a time. Wait until the hazard lights stop flashing or for approximately 26-30 seconds after reaching the desired pressure in one wheel before moving on to the next.
Pay Attention to Horn Chirps
The horn will chirp to provide feedback during the inflation or deflation process.
One chirp indicates the selected pressure has been reached, signaling that you should stop inflating or deflating the tire.
Three chirps indicate an overinflated or over-deflated tire.
Another single chirp confirms that enough air has been added or removed to reach the selected pressure level.
By following these instructions, you can effectively use Tire Fill Assist and Selectable Tire Fill Alert in your Jeep Grand Cherokee. These features provide valuable assistance in maintaining proper tire pressure, contributing to safer and more efficient driving experiences.