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: 257 of 549

B1010-55:- Crash output HWnot configured

Overview:-

ISO Code

B101055

Customer Symptom

SRS Warning Lamp continuously ON in Instrument Cluster

Fault Effects (On Vehicle)

Crash output functionality not available in vehicle as per VC

resulting in degraded functionality of automatic door unlock &

fuel cut off in case of an accident.

Lamp Status (If Any)

SRS Warning Lamp continuously ON in Instrument Cluster

Fault Detection Condition

Crash output HW is not configured in EOL, but physically

present in the vehicle or

Crash output HW is configured in EOL, but physically not

present in the vehicle.

Normal Operating Condition

Crash Output Hardware configuration & physical presence in

the vehicle should be as per the VC.

Probable Trouble Area

Related wiring Harness, connector or terminals

Crash Output HW

Airbag ECU

Healing Condition

1. Correct System configuration should be written to Airbag

ECU as per VC.

2. Crash Output Hardware physical presence should be as

per VC.

Component Details:-

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.

Crash Output HW:-

Crash Output signal via Hardware pin (A5) is sent by Airbag ECU to other ECU’s in the vehicle

within 25 milliseconds when a crash happens. BCM & EMS ECU processes this crash output signal. BCM ECU will

trigger for door unlocking & hazard lights ON & EMS ECU will trigger for fuel cut off.

Preliminary Checks:-

1. Check Battery Voltage (12 V & above)

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

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

Trouble Shooting:-