# Service bulletin T\-SB\-0035\-25 Rev1

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11021728
- Published by NHTSA: 2025\-08\-08
- Manufacturer's number: T\-SB\-0035\-25 Rev1
- Manufacturer's date: 2025\-07\-24
- Campaign id or software version: T\-SB\-0035\-25 Rev1
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021728-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021728-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Trouble codes named

U1174

## Vehicles listed

- 2025 TOYOTA SIENNA HYBRID

JSON: [/v1/bulletins/11021728](/v1/bulletins/11021728)

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