# Over\-the\-air update 663.70

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: Over\-the\-air update
- NHTSA id: 11036489
- Published by NHTSA: 2026\-08\-31
- Manufacturer's number: 663.70
- Manufacturer's date: 2026\-08\-12
- Campaign id or software version: 663.70
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: RSI: RSI \(Rear Seat Infotainment\)

## NHTSA's summary

• Improvements to prevent loss of audio, including chimes and turn signal indicator sound • The rear passenger display will prompt you to add headphones when that is the selected audio option

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036489-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036489-9999.pdf)

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

## Vehicles listed

- 2025 to 2026 CADILLAC CELESTIQ

JSON: [/v1/bulletins/11036489](/v1/bulletins/11036489)

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