# U1174 on the 2025 Toyota Sienna

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name U1174

- [11021728](https://open.wenmarpro.com/bulletins/11021728), 2025-08-08: Some 2025 model year Sienna Hybrid vehicles equipped with the advanced rear seat reminder system may exhibit one or both of the following conditions: •A “Rear Seat Reminder Malfunction – Visit Your Dealer” message on the Multi\-information Display \(MID\). •Diagnostic Trouble Code \(DTC\) U117487 \(Lost Communication with Cabin Occupant Recognition Sensor Missing\) present in the main body ECU. The cabin object recognition sensor assembly logic has been modified to address these conditions.
- [11019336](https://open.wenmarpro.com/bulletins/11019336), 2025-06-06: Some 2025 model year Sienna Hybrid vehicles equipped with the advanced rear seat reminder system may exhibit one or both of the following conditions: • A “Rear Seat Reminder Malfunction – Visit Your Dealer” message on the Multi\-information Display \(MID\). • Diagnostic Trouble Code \(DTC\) U117487 \(Lost Communication with Cabin Occupant Recognition Sensor Missing\) present in the main body ECU. The cabin object recognition sensor assembly logic has been modified to address these conditions.
- [11018333](https://open.wenmarpro.com/bulletins/11018333), 2025-05-15: Some 2025 model year Sienna Hybrid vehicles equipped with the advanced rear seat reminder system may exhibit one or both of the following conditions: • A “Rear Seat Reminder Malfunction – Visit Your Dealer” message on the Multi\-information Display \(MID\). • Diagnostic Trouble Code \(DTC\) U117487 \(Lost Communication with Cabin Occupant Recognition Sensor Missing\) present in the main body ECU. The cabin object recognition sensor assembly logic has been modified to address these conditions.