HARRIER BOOK 2

TATA MOTORS Ltd.

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SRS / Airbag

ECU – DTC Troubleshooting Guide

Version: 14.0

Date: 14-February-2017

Prepared by:Airbag COC Review &

Approved by:Sanjeev VM

Page: 151 of 549

B100F-12:- Frontal Impact Passenger Sensor circuit short to battery

Overview:-

ISO Code

B100F12

Customer Symptom

SRS Warning Lamp continuously ON in Instrument Cluster.

Fault Effects (On Vehicle)

Front Crash detection performance is degraded &

Front Passenger angular crash detection is not guaranteed.

Lamp Status (If Any)

SRS Warning Lamp continuously ON in Instrument Cluster.

Fault Detection Condition

This fault gets logged if any of the high side (B8) or low side pin

(B7) of Frontal Impact Passenger sensor gets shorted with

battery line.

Normal Operating Condition

No short with battery should be present.

Probable Trouble Area

Related wiring Harness, connector or terminals

Frontal Impact Passenger sensor

Airbag Wiring Harness

Airbag ECU

Healing Condition

Remove the short to battery.

Component Details:-

Frontal Impact Sensor

:- It is usually located in the radiator support vertical member. Front impact sensors collect the

data necessary to make decisions about Airbag deployment.

Airbag ECU

:- It is fitted in the floor of central console in the car. The Airbag Electronic Control Unit (ECU) controls the

deployment system to allow an appropriate igniting of the Airbags and belt pre-tensioners to restrain the driver and

passengers.

Preliminary Checks:-

1. Check Battery Voltage (12 V & above)

2. Check for any faults in Airbag Warning Lamp indication in Instrument Cluster.

Trouble Shooting:-

3. Ensure the proper locking of Airbag ECU wiring harness connectors in the vehicle by the locking sound.