B1089 PRE-TEN FRONT LH

B1089

Description
DTC Logic
Diagnosis Procedure

Description

For front LH seat belt pre-tensioner, crash is judged by main “G” sensor output signal and safing algorithm in front direction.

OPERATION

In the case of a frontal collision that exceeds specified impact level, the air bag diagnosis sensor unit detects the deceleration caused by collision. It restrains the passenger with seat belt easing the stress on passengers chest with load limiter.

STRUCTURE

The restraint system for front seat occupant consists of the pre-tensioner mechanism and load limiter mechanism.

INSTALLATION

Front LH seat belt pre-tensioner is installed on the underside of center pillar with fixed nuts.

DTC Logic

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
B1089	PRE-TEN FRONT LH [SHORT]	Front LH seat belt pre-tensioner circuit are shorted to each other	Disconnection of wiring harness and short Malfunction in front LH seat belt pre-tensioner Malfunction in air bag diagnosis sensor unit

DTC CONFIRMATION PROCEDURE

1.CHECK SELF-DIAG RESULT

Diagnosis Procedure

■ WARNING ■

Before servicing, turn ignition switch OFF, disconnect battery negative terminal and wait at least 3 minutes. (To discharge backup capacitor.)

Never use unspecified tester or other measuring device.

1.CHECK HARNESS CONNECTOR

2.CHECK WIRING HARNESS

3.REPLACE FRONT SEAT BELT PRE-TENSIONER

4.REPLACE AIR BAG DIAGNOSIS SENSOR UNIT