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: 261 of 549

B1010-14:- Crash output HW circuit short to ground or open

Overview:-

ISO Code

B101014

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 unlocks

& fuel cut off in case of an accident.

Lamp Status (If Any)

SRS Warning Lamp continuously ON in Instrument Cluster

Fault Detection Condition

1. Crash output HW device is configured in EOL, but

physically not present in the vehicle.

2. Crash output HW is open or short to ground

Normal Operating Condition

1. Correct system configuration should be present in

Airbag ECU as per the VC.

2. Crash output HW presence should be as per the VC.

3. Short to ground should not be present for Crash output

HW.

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. Short to ground for Crash output HW should be

removed.

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:-