4400 / 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: 131 of 549
B100F-2B:- Frontal Impact Passenger sensor signal cross coupled
Overview:-
ISO Code
B100F2B
Customer Symptom
SRS Warning Lamp continuously ON in Instrument Cluster.
Fault Effects (On Vehicle)
Front Crash detection performance is degraded &
Front Passenger angular crash detection is not guaranteed.
Lamp Status (If Any)
SRS Warning Lamp continuously ON in Instrument Cluster.
Fault Detection Condition
This fault gets logged if the signal of Frontal Impact Passenger
Sensor gets cross coupled with any other sensor terminal
during Power ON.
Normal Operating Condition
No cross coupling should be present.
Probable Trouble Area
Related wiring Harness, connector or terminals
Frontal Impact Passenger sensor
Airbag ECU
Airbag Wiring Harness
Healing Condition
Cross coupling should be removed & Ignition should be turned
OFF & ON.
Component Details:-
Frontal Impact Sensor
:- It is usually located in the radiator support vertical member. Front impact sensors collect the
data necessary to make decisions about Airbag deployment.
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:-