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: 84 of 549

B0072-2B:- Passenger Seatbelt Pretensioner Deployment Control signal cross coupled

Overview:-

ISO Code

B00722B

Customer Symptom

SRS Warning Lamp continuously ON in Instrument Cluster.

Fault Effects (On Vehicle)

Passenger Seatbelt Pretensioner deployment not guaranteed, if

a crash happens

Lamp Status (If Any)

SRS Warning Lamp continuously ON in Instrument Cluster.

Fault Detection Condition

This fault gets logged if the signal of Passenger Seatbelt

Pretensioner gets cross coupled with any other Firing loop

terminal during Power ON.

Normal Operating Condition

No cross coupling should be present.

Probable Trouble Area

Related wiring Harness, connector or terminals

Passenger Seatbelt Pretensioner Module

Airbag Wiring Harness

Airbag ECU

Healing Condition

Cross coupling should be removed & Ignition should be turned

OFF & ON.

Component Details:-

Seatbelt Pre-tensioners

:- Seatbelt Pre-tensioners retracts forcefully to adjust occupants into a safer seating position

when the airbags deploy. It is usually located in the B-pillar and is connected with the seat belt buckle assembly.

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.

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

Trouble Shooting:-