By Christina Rogers And Jeff Bennett 

A U.S. senate hearing on Thursday is expected to highlight how auto companies and regulators were slow to respond to driver injuries from exploding air bags and how out-of-court settlements kept information on air-bag flaws under wraps.

Officials from Takata Corp., the air-bag maker that this week balked at expanding an existing recall, Chrysler Group LLC and Honda Motor Co. are scheduled to testify on their company's handling of injury reports before the Senate Committee on Commerce, Science, and Transportation hearing.

"The American people deserve to know the whole story behind this air-bag recall," said Sen. Bill Nelson (D., Fla.), the committee's chairman. "That's why we're holding this hearing to get them some answers and spur auto makers to do more to help get these dangerous cars off the road and fixed as soon as possible."

The car air bags can explode with too much force, sending metal pieces into the passenger cabins. Chemical inflaters made by Takata and supplied to 10 auto makers have been identified as causing five deaths and several serious injuries, mostly during accidents in hot and humid weather areas.

On Tuesday, the National Highway Traffic Safety Administration called for Takata and auto makers to expand their recalls of older vehicles that use the suspect inflater canisters. The agency cited a driver injury in North Carolina, a state not included in the regional recalls. Most recalls thus far have been limited to hot and humid weather regions.

Hiroshi Shimizu, Takata's senior vice president in charge of quality issues, will testify on the company's behalf. He has spent half of his 36-year Takata career in the U.S., involved in air-bag and seat-belt production and sales operations.

On Wednesday, spokesmen for Takata and Honda separately declined to comment on their executives' testimonies before the committee.

Takata earlier objected to the agency's demand for a nationwide recall, saying an expanded action could slow delivery of parts to those regions with high humidity and temperature, which it considers as high-priority because most incidents incurred there. Auto makers said they are working with NHTSA but few so far have agreed to replace all the suspect inflaters.

Chrysler and Honda are among 10 car makers that use Takata air bags. Among other cases that have come to light is a July out-of-court settlement between Chrysler and a Florida man after an air bag exploded in his 2006 Dodge Charger. Chrysler hasn't formally recalled its vehicles, conducting what it calls a safety campaign in a few states.

The incident involving the Dodge Charger was reported to NHTSA late last year. In June, Chrysler said it would initiate a "field action" to replace the car's air-bag inflaters.

Nearly five months later, the company's field action has yet to begin.

In the Florida case, driver Damian Fernandez received an undisclosed cash settlement in July from Chrysler after he suffered a four-inch gash in his leg when the Takata air bag in his 2006 Dodge Charger exploded during a traffic accident. When the air bag deployed, it sent a metal fragment in his left leg.

"Settlements are often pursued to mitigate the costs of litigation," a Chrysler spokesman said. "Settlements are confidential to protect the privacy of the parties. We always seek early resolution in settlement matters to see if amicable agreements can be reached."

In part, auto makers say they don't have a handle on what is causing the air bags to explode too forcefully. General Motors Co.'s product chief, Mark Reuss, said on Wednesday the industry needs to continue working to figure out the root cause of the air-bag defects.

"Right now we don't know what that is," Mr. Reuss said.

On Wednesday, the White House nominated Mark Rosekind as NHTSA administrator. Mr. Rosekind is a member of the National Transportation Safety Board, which studies aviation, highway and other transportation accidents. The federal agency has been run by Deputy Administrator David Friedman for almost a year.

Before the hearing, senators Edward Markey (D., Mass.) and Richard Blumenthal (D., Conn.) will join the sister of a 2003 Arizona victim in a news conference. Sen. Blumenthal said he couldn't add any additional details but promised the hearing would be hard hitting.

"I am expecting a penetrating hearing with tough questions as to Takata's culpability," Mr. Blumenthal said. "We also need to get focused on the continuing threat of these air bags and hold Takata and the auto makers accountable for the deaths and damage in the past and what may happen in the future if there is no national recall."

Yoko Kubota and John D. Stoll contributed to this article.

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