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: 284 of 549

B0020-12:- Left Side Airbag Deployment Control circuit short to battery

Overview:-

ISO Code

B0020-12

Customer Symptom

SRS Warning Lamp continuously ON in Instrument Cluster.

Fault Effects (On Vehicle)

Left Side 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 any of the high side (B14) or low side pin

(B13) of Left Side Airbag gets shorted with battery line.

Normal Operating Condition

No short with battery should be present.

Probable Trouble Area

Related wiring Harness, connector or terminals

Left Side Airbag Module

Airbag Wiring Harness

Airbag ECU

Healing Condition

Remove the short to battery.

Component Details:-

Left Side Airbag Module: -

This airbag is located in seat which inflate between the occupant and door.

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:-