Reversible Belt Tensioner, Basic Function - GF91.40-P-9890A

Model All (CAR) 

Example illustration of reversible belt tensioner 

Overview 

This document contains information on:

• General 
• Function 

General 

Seat belt tensioner, which in contrast to conventional pyrotechnically triggered seat belt tensioners is triggered via an electric motor.

In the event of an impending accident, electric motors pull on the seat belts and fasten the vehicle occupants to the seat so that airbags and seat belts can provide their optimum protective effect.

In contrast to the conventional seat belt tensioner, it does not need to be replaced after triggering (reversible = recoverable).

Function 

The reversible belt tensioners (1, 2) have the task of tensioning the seat belt of the driver's or front passenger seat in certain hazardous situations by actuating the integrated actuator motor. Securing the vehicle occupants in the seat in a more optimal fashion minimizes the consequences of a potentially impending accident. If the seat belt adjustment function is active, the seat belt slack is additionally reduced when the seat belt is fastened.

The reversible belt tensioners (1, 2) are connected to the network architecture of the vehicle.

The reversible belt tensioners (1, 2) process, among other things, the following information:

• Driver or front passenger seat belt buckle status
• Crash signal
• Status of the preventive occupant protection system
• Status of seat belt adjustment function

The reversible belt tensioners (1, 2) process this information and actuate the integrated actuator motors accordingly. Faults and malfunctions are communicated to the driver.

The seat belt tensioners are equipped with a mechanical acceleration sensor which locks the belt tension in the event of vehicle deceleration of over 0.3 g. Therefore, the seat belt can remain mechanically locked despite the emergency tensioning having ended.

	Component descriptions
	Component description for front reversible emergency tensioning retractors	Model 223 with code 460 (Canada version) with code 562 (Driver seat belt buckle with integrated tensioning function) Model 223 with code 494 (US version) with code 562 (Driver seat belt buckle with integrated tensioning function)	GF91.40-P-4020A
		Model 243 with code 299 (PRE-SAFE®)	GF91.40-P-4020B
		Model 206 with code 299 (PRE-SAFE®)	GF91.40-P-4020C
		Model 297 with code 299 (PRE-SAFE®)	GF91.40-P-4020D
		Model 295 with code 299 (PRE-SAFE®)	GF91.40-P-4020E
		Model 232 with code 299 (PRE-SAFE®)	GF91.40-P-4020F
		Model 296 with code 299 (PRE-SAFE®)	GF91.40-P-4020G
		Model 254 with code 299 (PRE-SAFE®)	GF91.40-P-4020H
		Model 214	GF91.40-P-4020K
		Model 118, 177, 247 as of Model year 2023 with code 299 (PRE-SAFE®)	GF91.40-P-4020L
		Model 167 as of Model year 2023	GF91.40-P-4020M
		Model 294 with code 299 (PRE-SAFE®)	GF91.40-P-4020N