HARRIER BOOK 2

TATA MOTORS Ltd.

This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout the consent of author.

SRS / Airbag

ECU – DTC Troubleshooting Guide

Version: 14.0

Date: 14-February-2017

Prepared by:Airbag CoC Review &Approved

by:Sanjeev VM

Page: 15 of 549

B0001-1B:- Driver Frontal Stage 1 Deployment Control circuit resistance above threshold

Overview:-

ISO Code

B00011B

Customer Symptom

SRS Warning Lamp continuously ON in Instrument Cluster.

Fault Effects (On Vehicle)

Driver Airbag 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 Driver Airbag is

above the threshold value (5.5 Ohm) after 4 seconds of cranking.

Normal Operating Condition

The maximum threshold for Driver Frontal Stage 1 Deployment

Control circuit is 5.5 Ohm.

Probable Trouble Area

Related wiring Harness, connector or terminals

Driver Airbag Module

Clock Spring

Airbag ECU

Healing Condition

Maximum threshold resistance for Driver Airbag including clock

spring resistance should be less than 5.5 Ohm.

Component Details:-

Clock spring

:- It is located between the steering column and steering wheel that conducts electrical signals in an

Airbag system to the module, while allowing steering-wheel rotation. This provides electrical continuity in all steering

wheel positions.

Driver Airbag Module

:- It is fitted inside the steering wheel consisting of a flexible fabric envelope or cushion

designed to inflate rapidly during an accident.

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:-