My wife's Honda Crosstour has the TPMS light on, but I can't find any definitive info on what to do about it.

• Some people are saying that there are no Schrader valve sensors, but instead the ABS system can sense the pressure in the tires.
  
• Some sources say it needs to go to the dealer, some say there is a button to the left of the steering wheel that needs to be held down, but the only button there is the ABS on/off and holding that down has no effect.
  
• Others say you need to go into the Settings/Info/ and reset the TPMS, but I can't find that either.
  

So, does anyone know what I should do?

 

If the TPMS light is on, then you can get the car scanned for VSA trouble codes with a code reader/scanner that has the capability to read to Honda ABS/SRS/VSA trouble codes (not all code reader/scanners has the software capability). Some auto parts shops will scan for trouble codes for no charge. Otherwise, you'll need a capable code reader/scanner that you can purchase or go to a car repair shop to get it scanned.

This is a description of the TPMS:

2013 Accord Crosstour comes with an indirect TPMS that doesn’t use tire pressure sensors mounted inside the tires. Instead, it uses the existing VSA wheel speed sensors to monitor and compare tire characteristics while driving.

This is part of the TPMS system description of models with Adaptive Cruise Control (ACC):

Low Pressure Detection Methods
The Indirect TPMS establishes a baseline tire pressure reading using the wheel speed sensors while, indirectly, monitoring tire pressure to detect pressure loss in any of the four tires.

The system uses these two methods to determine loss of tire pressure:

• Wheel speed differential
• Peak tire resonance.

Both methods make use of outside temperature sensor data to correct calculated tire pressures for ambient temperature variations.

Wheel Speed Differential
When monitoring tire pressure using the wheel speed differential method, the TPMS module compares the speed of the wheels in three different configurations:

• Diagonal comparison between the front and rear wheels
• Comparison between the two front and two rear wheels
• Comparison between the two right and two left wheels

Tire diameter shrinks as the tire deflates, causing the wheel speed to increase.

Consequently, if the difference in wheel speeds exceeds the threshold, the low tire pressure/TPMS indicator turns ON

Peak Tire Resonance
Peak resonance values are learned during calibration and become the reference values for pressure monitoring. When using the frequency resonance method, the TPMS module compares the peak resonance values between all four tires and the two front tires.

If the present values have dropped below a 20% pressure threshold, the low tire pressure/TPMS indicator turns ON.

Resonance frequency is corrected based on the outside air temperature sensor information, because resonance frequency is changed by the outside air temperature.

The TPMS module compares the peak resonance values learned at calibration. If the value drops below a 20% pressure threshold, the low tire pressure/TPMS indicator turns ON.

Temporary Suspension
Certain situations, such as when the vehicle is turning, accelerating, decelerating, or braking will temporarily prevent the system from monitoring tire pressures due to varying tire loads. The TPMS module uses other devices such as the lateral acceleration sensor, the yaw sensor, the steering angle sensor, the master cylinder pressure sensor and the PCM data to determine how the vehicle is being driven.

 

The VSA speed sensor are similar to what used to be called ABS wheel speed sensors. Honda's VSA system controls more than just ABS.

Each wheel bearing has a magnetic encoder incorporated into them. The wheel speed sensors picks up the signals from the magnetic encoders.

 

Thanks for the info.
I checked the tire pressure and filled up each tire to exactly 32psi. There is a separate indicator for low tire pressure, but it is not activated.
However, the TPMS system light is on, so I guess that means it's unable to read one or more tires to do its comparisons.
I do have a simple code reader, but it is not showing any codes, so I guess I'll have to take it down to the auto parts store and have them read it.