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2016 – MX-5 – Restraints

SEAT BELT

Outline

With standard deployment air bag control system

• Three-point seat belts with the following functions for passengers have been adopted.

• Load limiter

• ELR (Emergency Locking Retractor: emergency locking mechanism)

• Pre-tensioner seat belt

With two-step deployment air bag control system

• Three-point seat belts with the following functions for passengers have been adopted.

• Load limiter

• ELR

• ALR (Automatic Locking Retractor: child-restraint seat locking mechanism) (passenger’s side)

• Pre-tensioner seat belt

• Lap pre-tensioner seat belt

Function

• The seat belts are belt type safety devices which restrain the occupants in their seats.

• The seat belt prevents the driver and the passenger from being thrown from the seat and injured due to an emergency vehicle stop or impact by being hit.

• The specifications for each seat belt are as indicated in the table.

With standard deployment air bag control system

Seat belt	Type	Function
Driver’s side	Three-point	Load limiter ELR Pre-tensioner seat belt
Passenger’s side	Three-point	Load limiter ELR Pre-tensioner seat belt

With two-step deployment air bag control system

Seat belt	Type	Function
Driver’s side	Three-point	Load limiter ELR Pre-tensioner seat belt Lap pre-tensioner seat belt
Passenger’s side	Three-point	Load limiter ELR ALR Pre-tensioner seat belt Lap pre-tensioner seat belt

Structural View

Construction, Operation

• For the three-point seat belt, the seat belt is secured to the drum in the retractor and wrapped.

• The seat belt is pulled out or retrieved by the rotation of the drum to adjust the length of the seat belt.

Load limiter

• When a certain amount of force is applied to the seat belt by an occupant moving forward by inertia force after the pre-tensioner seat belt operates, the locking base in the retractor is unlocked, the seat belt pulls out to mediate the pressure of the seat belt against the occupant.

ELR (Emergency Locking Retractor)

• If a sudden force is applied to a seat belt by an occupant moving forward by inertia force due to a vehicle collision or sudden braking, the locking base in the retractor is locked to prevent (lock) the seat belt from being pulled out.

ALR (Automatic Locking Retractor)

• When the seat belt is pulled out and fastened, the ALR locks the seat belt at that length and it cannot be pulled out any more.

• The ALR is mainly used for installing a child-restraint.

Pre-tensioner seat belt

• Refer to [PRE-TENSIONER SEAT BELT]. (See PRE-TENSIONER SEAT BELT [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See PRE-TENSIONER SEAT BELT [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

Lap pre-tensioner seat belt

• Refer to [LAP PRE-TENSIONER SEAT BELT [TWO-STEP DEPLOYMENT CONTROL SYSTEM]]. (See LAP PRE-TENSIONER SEAT BELT [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

Fail-safe

• Not applicable

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