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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: 19 of 549
B0001-2B:- Driver Frontal Stage 1 Deployment Control signal cross coupled
Overview:-
ISO Code
B00012B
Customer Symptom
SRS Warning Lamp continuously ON in Instrument Cluster.
Fault Effects (On Vehicle)
Driver 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 Driver 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
Driver Airbag Module
Clock Spring
Airbag ECU
Healing Condition
Cross coupling should be removed & Ignition should be turned
OFF & ON.
Component Details:-
Clock spring
:- It is located between the steering column and steering wheel that conducts electrical signals in an
Airbag system to the module, while allowing steering-wheel rotation. This provides electrical continuity in all
steeringwheel positions.
Driver Airbag Module
:- It is fitted inside the steering wheel consisting of a flexible fabric envelope or cushion
designed to inflate rapidly during an accident.
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:-