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: 88 of 549

B0072-11:- Passenger Seatbelt Pretensioner Deployment Control circuit short to ground

Overview:-

ISO Code

B007211

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 any of the high side (A21) or low side pin

(A22) of Passenger Seatbelt Pretensioner gets shorted with

ground line.

Normal Operating Condition

No short with ground should be present.

Probable Trouble Area

Related wiring Harness, connector or terminals

Passenger Seatbelt Pretensioner Module

Airbag Wiring Harness

Airbag ECU

Healing Condition

Remove the short to ground.

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:-