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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: 326 of 549
B0073-1A:- Second Row Left Seatbelt Pre tensioner Deployment Control circuit resistance below
threshold
Overview:-
ISO Code
B0073-1A
Customer Symptom
SRS Warning Lamp continuously ON in Instrument Cluster.
Fault Effects (On Vehicle)
Second Row Left Seat belt Pre tensioner 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 second row left
seatbelt pre tensioner is below the threshold value (1.1 Ohm) after
4 seconds of cranking.
Normal Operating Condition
The minimum threshold Second Row Left Seat belt Pre tensioner
Deployment Control circuit is 1.1 Ohm.
Probable Trouble Area
Related wiring Harness, connector or terminals
Second Row Left Seat belt Pre tensioner
Airbag ECU
Airbag Wiring Harness
Healing Condition
Minimum threshold resistance for Second Row Left Seat belt Pre
tensioner should be 1.1 Ohm.
Component Details:-
Second Row Left Seatbelt Pre tensioner Module
: - It is located at the rear passenger door wheel arch inner panel.
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:-