Hyundai Sonata LF: Restraint / Seat Belt Pretensioner

Hyundai Sonata LF 2014-2019 Service Manual / Restraint / Seat Belt Pretensioner

Seat Belt Pretensioner (BPT) Description and Operation

Description

The Seat Belt Pretensioners (BPT) are installed inside Center Pillar (LH & RH). When a vehicle crashes with a certain degree of frontal impact, the pretensioner seat belt helps to reduce the severity of injury to the front seat occupants by retracting the seat belt webbing. This prevents the front occupants from thrusting forward and hitting the steering wheel or the instrument panel when the vehicle crashes.

Never attempt to measure the circuit resistance of the Seat Belt Pretensioner (BPT) even if you are using the specified tester. If the circuit resistance is measured with a tester, the pretensioner will be ignited accidentally. This will result in serious personal injury.

Seat Belt Pretensioner (BPT) Components and Components Location

Components

Seat Belt Pretensioner (BPT) Repair procedures

Removal

1.	Disconnect the battery negative cable, and wait for at least three minutes before beginning work.

2.	Remove the door scuff trim. (Refer to Body - "Interior Trim")

3.	Remove the center pillar trim. (Refer to Body - "Interior Trim")

4.	Loosen the seat belt pretensioner mounting bolts (A) and remove the seat belt pretensioner.

5.	Disconnect the seat belt pretensioner connector (B).

Installation

1.	Remove the ignition key from the vehicle.

2.	Disconnect the battery negative cable and wait for at least three minutes.

3.	Install the seat belt pretensioner with bolts (A).

Connect the seat belt pretensioner connector (B).

Tightening torque:

Bolt B: 39.2 ~ 53.9 N.m (4.0 ~ 5.5 kgf.m, 28.9 ~39.8 lb-ft)

5.	Install the center pillar trim. (Refer to Body - "Interior Trim")

6.	Install the door scuff trim. (Refer to Body - "Interior Trim")

Insert the seat belt to the anchor pretensioner.

Make sure the lock pin is connected in properly.

8.	Reconnect the battery negative cable.

After installing the seat belt pretensioner, confirm proper system operation:

A.	Turn the ignition switch ON; the SRS indicator light should be turned on for about six seconds and then go off.

Emergency Fastening Device (EFD) Description and Operation

Description

The Emergency Fastening Device (EFD) operates at the same time with the Seat Belt Pretensioner when it satisifies the deployment condition after a collision. It is an auxiliary equipment to prevent a driver and passenger from breaking away by pulling the seat belt toward the anchor side after a collision. It is located near the anchor on the driver and passenger seat and is supported by two cables.

Never measure the resistance of the anchor pretensioner directly, the current of the measuring device may cause unexpected airbag deploy.

Emergency Fastening Device (EFD) Components and Components Location

Components

Emergency Fastening Device (EFD) Repair procedures

Removal

1.	Disconnect the battery negative cable and wait for at least 3 minutes before beginning work.

2.	Remove the front seat. (Refer to Body - "Front Seat Assembly")

3.	Remove the rear seat. (Refer to Body - "Rear Seat Assembly")

Remove the front anchor seat belt (A).

When replacing anchor pretensioner, make sure to use the assigned tools to remove the anchor safety belt connector (A).

Tools to be used

Tool A: hex wrench screwdriver or drill with diameter of 3 mm and length of 56 mm or more.

Tool B: screwdriver or drill with diameter of 3 mm.

(1)

Insert the tool (A) vertically into the hole (F). Then, tilt it over 10° as shown in the figure.

When tilted 10°, tool (A) pushes and rotates the internal part (C).

(2)	Insert and push the tool (B) vertically into the hole (E). Then, anchor safety belt connector (D) will be disconnected.

5.	Remove the door scuff trim. (Refer to Body - "Interior Trim")

6.	Remove the center pillar trim. (Refer to Body - "Interior Trim")

7.	Remove the floor carpet assembly. (Refer to Body - "Floor Carpet")

8.	Disconnect the anchor pretensioner (A)

9.	Loosen the monuting bolt (B) and remove the anchor pretensioner

Installation

1.	Installation is reverse of removal.

2.	Connect the battery (-) terminals.

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