---
kind: "section"
citation: "49 C.F.R. § 561.9"
title: "49"
number: "561.9"
heading: "Documentation of an audio-visual warning for a thermal event in the REESS."
url: "https://uscodex.org/cfr/49/561.9"
---

# §561.9. Documentation of an audio-visual warning for a thermal event in the REESS.


At NHTSA's request, each manufacturer shall submit documentation that includes the following:

- (a) The make, model, model year, and production dates of the vehicles to which the submitted documentation applies.
- (b) **A system diagram of the thermal event warning system.**
- (c) **A written explanation describing the basic operation of the thermal event warning system.** The explanation must identify the components of the thermal event warning system, provide descriptions of their functions and capability, and provide a logic diagram and description of conditions that would lead to triggering the warning activation.
- (d) Validation results from tests to confirm the activation of an audio-visual warning in the case of a thermal event in the REESS.
- (e) **Overall evaluation—** A description of the final manufacturer review/audit process and results of the final review or audit which evaluated the technical content and the completeness and verity of [paragraphs (a) through (d)](#a..d) of this section.

## Notes

### Authority

Authority: 49 U.S.C. 322, 30111, 30115, 30117, and 30166; delegation of authority at 49 CFR 1.95.

### Source

Source: 89 FR 104350, Dec. 20, 2024, unless otherwise noted.