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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: 331 of 549
B0073-1B:- Second Row Left Seatbelt Pre tensioner Deployment
Control circuit resistance
above threshold
Overview:-
ISO Code
B00731B
Customer Symptom
SRS Warning Lamp continuously ON in Instrument Cluster.
Fault Effects (On Vehicle)
Second Row Left Seatbelt 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 above the threshold value (5.5 Ohm)
after 4 seconds of cranking.
Normal Operating Condition
The maximum threshold for Second Row Left Seatbelt Pre
tensioner Deployment Control circuit is 5.5 Ohm.
Probable Trouble Area
Related wiring Harness, connector or terminals
Second Row Left Seatbelt Pre tensioner Module
Airbag ECU
Airbag Wiring Harness
Healing Condition
Maximum threshold resistance for Second Row Left Seatbelt Pre
tensioner should be less than 5.5 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:-