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: 510 of 549

B0075-1A:- Second Row Right Seatbelt Pre tensioner Deployment Control circuit resistance below

threshold

Overview:-

ISO Code

B00751A

Customer Symptom

SRS Warning Lamp continuously ON in Instrument Cluster.

Fault Effects (On Vehicle)

Second Row Right Seatbelt Pre tensioner 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 circuit resistance of Second Row

Right Seatbelt Pre tensioner is below the threshold value (1.1

Ohm) after 4 seconds of cranking.

Normal Operating Condition

The minimum threshold for Second Row Right Seatbelt Pre

tensioner Control circuit is 1.1 Ohm.

Probable Trouble Area

Related wiring Harness, connector or terminals

Second Row Right Seatbelt Pre tensioner Module

Airbag ECU

Airbag Wiring Harness

Healing Condition

Minimum threshold resistance for Second Row Right Seatbelt

Pre tensioner should be 1.1 Ohm.

Component Details:-

Second Row Right Seatbelt Pre tensioner Module

: - It is located at the rear driver door wheel arch inner panel.

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:-