That's the way I interpreted it. Horn chirps twice at start of process and once after each sensor is complete., 2 chirps when trailer is complete.
You have 2 minutes for each sensor.
Trailer Tire Pressure
Monitoring Operation
If equipped, the Trailer Tire Pressure Monitoring System (TTPMS) is designed to monitor the pressure of the trailer tires and warn the driver when a low pressure condition exists. TTPMS sensors for four tires are provided. The system can accommodate a trailer with up to six tires if additional sensors are purchased from the dealer. Also, the system can be paired with up to five individual trailers
Prior to use, the vehicle must learn the sensors by following the learning process. See Trailering App pg 308
The system is compatible with trailer tires that have placard pressure values from 103 - 689 kpa (15 - 100 psi). The hole in the wheel for the tire stem must be 11.43 mm (0.453 in) in diameter. Use of the pressure sensors on a wheel with a different stem hole size could result in loss of air from the tire.
Trailering App
Trailer Tire Pressure Setup
If the Trailer Tire Pressure Monitoring System (TTPMS) is detected, touch the Tire Pressure Monitoring icon to set up tire pressure monitoring.
Touch Yes to set up the sensors or touch No to return to the previous screen.
A trailer must be electrically connected to the vehicle before starting the sensor-to-vehicle learn process.
After selecting Start from the Learn Sensors screen, use the Tool Method or the Manual Method (described below) to learn each tire sensor, during which the current tire number will be highlighted.
Each sensor has a minimum of two minutes to learn, shown by a timer.
After a sensor is learned, a checkmark appears next to the tire, the vehicle horn will sound, the vehicle’s brake lamps will flash, and all working trailer lamps will flash.
It then moves to the next sensor.
To cancel the process touch Stop.
The recommended tire pressure must be entered for the trailer tires.
This allows the vehicle to alert when the tire pressure is high or low.
TTPMS must learn the location of the installed tire sensors to show correct air pressure and temperature for each tire.
To set up, use one of the following options or see a tire or trailer dealer for service.
The learning process must be repeated when the trailer tires are rotated or replaced. See “Editing
a Trailer Profile” later in this section for tire pressure sensor relearn information.
Tool Method:
A TTPMS activation tool can be purchased separately to learn the sensor locations.
Manual Method:
Without the tool, the air pressure can be increased or decreased in each tire for 10 seconds.
Do not exceed the maximum inflation pressure found on the tire sidewalls. Make sure to re-adjust tire pressure to the recommended level when the process is complete.
Sensor Learning Steps
To complete the sensor-to-vehicle learn process:
1. Touch Start on the Learn Sensors screen.
The horn chirps twice and the Learning Active screen appears on the infotainment display.
2. Start with the driver side front trailer tire.
3. Activate the tool near the valve stem or adjust the air pressure of this tire until the horn chirps and all working vehicle and trailer lights flash.
The process stops without saving the sensor locations if this step takes more than two minutes.
4. Move to the next tire and repeat Step 3 for each sensor.
The horn chirps twice when all sensors are completed.
5. Return to the vehicle to complete the setup.