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: 450 of 549

B0021-55:- Left Curtain Deployment Control not configured

Overview:-

ISO Code

B0021-55

Customer Symptom

SRS Warning Lamp continuously ON in Instrument Cluster

Fault Effects (On Vehicle)

No effect

Lamp Status (If Any)

SRS Warning Lamp continuously ON in Instrument Cluster

Fault Detection Condition

Left Side Curtain Deployment Device is not configured in EOL,

but physically present in the vehicle

Normal Operating Condition

Left Curtain configuration & physical presence in the vehicle

should be as per the VC.

Probable Trouble Area

Related wiring Harness, connector or terminals

Left Curtain System Configuration

Airbag ECU

Healing Condition

1. Correct System configuration should be written to Airbag

ECU as per VC.

2. Left Curtain physical presence should be as per VC.

Component Details:-

Left Curtain Module

: - In the vehicle, curtain Airbag is folded and installed behind roof headliner on left side of the

vehicle.

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:-