Seat Belt Systems: Description and Operation
Seat Belt Construction
Seat Belt with ELR
The seat belt with emergency locking retractor (ELR) is designed so that it locks immediately (to prevent the webbing from being pulled out of the retractor any further) when any of the following items is detected as exceeding each set value;
- Speed at which the webbing is pulled out of the retractor.
- Acceleration or deceleration of the vehicle speed.
- Inclination.
Seat Belt with A-ELR
The automatic and emergency locking retractor (A-ELR) works as an Emergency Locking Retractor (ELR) till its webbing is pulled all the way out and then on as an Automatic Locking Retractor (ALR) till it is retracted fully.
ALR: Automatically locks when the webbing is pulled out from the retractor and allowed to retract even a little. Then the webbing can not be pulled out any further, unless it is wound all the way back into the retractor, which releases the lock and allows the webbing to be pulled out.
Seat Belt with ELR and Pretensioner
The seat belt with ELR and a pretensioner has a pretensioner mechanism which operates in linkage with the air bag in addition to the ELR.
The pretensioner is incorporated in retractor assembly and controlled by SDM as one of air bag system components. It will be activated at the same time as the driver and passenger air bag module when an impact at the front of vehicle exceeds the specified value.
When servicing seat belt (retractor assembly) with pretensioner, be sure to observe all WARNINGS and CAUTIONS and Precautions on Service and Diagnosis of Air Bag System Precautions on Service and Diagnosis of Air Bag System:Advanced Air Bag or Precautions on Service and Diagnosis of Air Bag System Precautions on Service and Diagnosis of Air Bag System:Except Advanced Air Bag.
WARNING:
A seat belt pretensioner (retractor) that has been activated can no longer protect the seat-belt wearer.
Replace any seat belt whose pretensioner (retractor) has been activated with a new seat belt and buckle set. For instructions on how to check whether the pretensioner has been activated, refer to Repair and Inspection Required after Accident Repair and Inspection Required after Accident:Advanced Air Bag or Repair and Inspection Required after Accident Repair and Inspection Required after Accident:Except Advanced Air Bag.
Seat Belt Reminder (For Advanced Air Bag Model)
For driver side when driver's seat belt is unfastened (under the following conditions), seat belt reminder light and warning buzzer inform that driver's seat belt is unfastened. Seat belt reminder light located in combination meter and warning buzzer located inside BCM operate as follows:
- Seat belt reminder light comes on for approximately 20 seconds and then flashes for approximately 55 seconds when driver's seat belt is unfastened while ignition key switch is at ON position. Warning buzzer operates for approximately 6 seconds when driver's seat belt is unfastened while ignition key switch is at ON position.
- If vehicle speed exceeds 8 km/h with seat belt unfastened 30 seconds after above mentioned operation is completed, seat belt reminder light and warning buzzer operate in the same manner as mentioned above.
- If seat belt is still unfastened 180 seconds after above mentioned operation is completed, seat belt reminder light and warning buzzer operates same manner as above mentions.
- If driver's seat belt state is changed from "fastened" to "unfastened", seat belt reminder light and warning buzzer operate in the same manner as mentioned above.
For passenger side when passenger's seat belt is unfastened (under the following conditions), seat belt reminder light and warning buzzer inform that passenger's seat belt is unfastened. Seat belt reminder light located in center console indicator and warning buzzer located inside BCM operate as follows:
- Seat belt reminder light comes on for approximately 20 seconds and then flashes for approximately 55 seconds when passenger's seat belt is unfastened with occupant seated condition while ignition key switch is at ON position. Warning buzzer operates for approximately 6 seconds when passenger's seat belt is unfastened while ignition key switch is at ON position.
- If vehicle speed exceeds 8 km/h with seat belt unfastened 30 seconds after above mentioned operation is completed, seat belt reminder light and warning buzzer operate in the same manner as mentioned above.
- If seat belt is still unfastened 180 seconds after above mentioned operation is completed, seat belt reminder light and warning buzzer operate in the same manner as mentioned above.
- If passenger's seat belt state is changed from "fastened" to "unfastened", seat belt reminder light and warning buzzer operate in the same manner as mentioned above.