4548 / 4910
Copyright ©
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: 279 of 549
B0020-2B:- Left Side Airbag Deployment Control signal cross coupled
Overview:-
ISO Code
B0020-2B
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 the signal of Left Side Airbag gets
cross coupled with any other Firing loop terminal during Power
ON.
Normal Operating Condition
No cross coupling should be present.
Probable Trouble Area
Related wiring Harness, connector or terminals
Left Side Airbag Module
Airbag Wiring Harness
Airbag ECU
Healing Condition
Cross coupling should be removed & Ignition should be turned
OFF & ON.
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:-