Interpretation ID: nht81-2.34

DATE: 06/17/81

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Chrysler Corporation

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your recent letter requesting an interpretation concerning the seat belt warning system requirements of Safety Standard No. 208. You ask whether the standard permits the audible warning system to activate even when the seat belt is buckled. If the agency's response is negative, you ask that your letter be treated as a petition for rulemaking.

The answer to your question is no. The audible warning system cannot activate if the seat belt is buckled. This same question was asked in a request for interpretation and petition for rulemaking submitted by American Motors Corporation in 1979. Enclosed is a copy of the agency's December 31, 1979, response to American Motors, which explains the rationale for this interpretation.

The agency's position has not changed since the response to American Motors, although as part of our regulatory review, we do plan to look closely at the warning system requirements of Standard No. 208 in their entirety. That review could lead to major changes in the warning system requirements, and we will give serious consideration to your request during our analysis. At the current time, however, we deny your petition for rulemaking since the requested change is inconsistent with the rationale for the existing warning system requirements.

Sincerely,

ATTACH.

CHRYSLER CORPORATION

Raymond Peck -- Administrator, National Highway Traffic Safety Administration

Dear Mr. Peck:

Chrysler Corporation requests interpretation of the requirements contained in MVSS 208, Occupant Crash Protection, regarding the operation of the audible signal of the seat belt reminder system. Paragraph S7.3 requires:

A seat belt assembly provided at the driver's seating position shall be equipped with a warning system that activates for a period of not less than four seconds and not more than eight seconds (beginning when the vehicle ignition switch is moved to the "on" or the "start" position), a continuous or flashing warning light, visible to the driver, displaying the words, "Fasten Seat Belt" or "Fasten Belt" or the identifying symbol for the seat belt telltale in Table 2 of Federal Motor Vehicle Safety Standard No. 101-80 when condition (a) exists, and a continuous or intermittent audible signal when condition (a) exists simultaneously with condition (b).

(a) - The vehicle's position switch is moved to the "on" position or to the "start" position.

(b) - The driver's lap belt is not in use, as determined, at the option of the manufacturers, either by the belt latch mechanism not being fastened or by belt not being extended at least four inches from its stowed position.

Specifically, we request an interpretation of the language of S7.3 as to whether continued operation of the audible signal is permissible during the remaining portion of the four to eight second time period after the driver has started the engine and buckled his seat belt.

A affirmative interpretation would not depreciate the reminder systems effectiveness, would be cost beneficial, and in our opinion, is permitted under the language of the standard. The only adverse effect of such an interpretation would be a slight annoyance to those drivers who "buckle up" before the four to eight second time period has elapsed.

The seat belt reminder system that Chrysler Corporation uses includes a switch in the driver's lap belt buckle to deactivate the audible signal whenever the driver's lap belt is in use. The inclusion of this switch made good sense when the provisions of the standard required that the audible signal activate for at least one minute if the driver's lap belt was not in use. Subsequently, the Congress and the NHTSA amended the standard to require the current four to eight second limitation. With this limitation, there is no longer a need to deactivate the audible signal since in any event it can only function for a maximum of eight seconds. Consequently, we do not believe that operation of the audible signal for this time period would be a major annoyance to those seat belt users who "buckle up" before starting the engine. Moreover, allowing the audible signal to function regardless of whether the driver's lap belt is in use would improve the systems effectiveness by alerting other vehicle occupants of the need to "buckle up". The removal of the driver's seat belt buckle switch would result in a product cost savings of from $ 0.94 to $ 1.86 on our passenger cars and obviously increase the cost effectiveness of the seat belt reminder system.

We understand the NHTSA has previously interpreted the provisions of paragraph S7.3 to require that the audible signal be deactivated whenever the driver's lap belt is in use. That interpretation appears to be primarily based on the agency's intent as discussed in the previous rulemaking notices. While these are important, the language of the standard should be the final criteria to guide any interpretation of the standard. Moreover, we believe the intent of the agency cited in the response to the previous request for interpretation of paragraph S7.3 was really related to the earlier rulemaking actions at a time when the audible signal was required to function continuously or for at least one minute. Under the current four to eight second limitation, we doubt the agency's stated intent applies to such a de minimus matter.

If the agency cannot issue an affirmative interpretation of paragraph S7.3, we ask that this request be considered a petition for rulemaking to amend S7.3 of MVSS 208 and tha the necessary changes in the standard be adopted as soon as possible. As pointed out above, the requirement for a buckle switch to deactivate the audible signal when the driver "buckles up" has no safety merit and continuing a requirement for it perpetuates cost without benefit. In view of these facts and the potential cost savings if the buckle switch can be removed, the regulations should not require it.

Sincerely,

R. O. Sornson -- Director, Regulatory Research and Analysis