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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: 265 of 549
B0020-1A:- Left Side Airbag Deployment Control circuit resistance below threshold
Overview:-
ISO Code
B00201A
Customer Symptom
SRS Warning Lamp continuously ON in Instrument Cluster
Fault Effects (On Vehicle)
Firing of "Left Side Airbag Deployment Control" is 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 Left Side Airbag
is below the threshold value (1.7 Ohm) after 4 seconds of
cranking.
Normal Operating Condition
The minimum threshold for Left Side Airbag Deployment
Control circuit is 1.7 Ohm.
Probable Trouble Area
Related wiring Harness, connector or terminals
Left Side Airbag Module
Airbag ECU
Healing Condition
Minimum threshold resistance should be 1.7 Ohm.
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:-