HARRIER BOOK 2

TATA MOTORS Ltd.

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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: 237 of 549

B100B-2B:- Passenger Deactivation switch (PADS) signal cross coupled

Overview:-

ISO Code

B100B2B

Customer Symptom

SRS Warning Lamp continuously ON in Instrument Cluster

Fault Effects (On Vehicle)

PAD Switch functionality not available as per VC resulting in

Passenger Airbag deployment in a crash in case when the front

Passenger is un occupied or a child is sitting in the front

passenger seat, which can be dangerous to the child occupant.

Lamp Status (If Any)

SRS Warning Lamp continuously ON in Instrument Cluster

Fault Detection Condition

This fault gets logged if the PAD Switch signal gets cross

coupled with any other Switch in the Vehicle.

Normal Operating Condition

Signal cross coupled fault should not be present for PAD

Switch.

Probable Trouble Area

Related wiring Harness, connector or terminals

PAD Switch

System Configuration

Airbag ECU

Healing Condition

Cross coupled of PAD Switch in Wiring Harness or at Airbag

ECU pins should be removed.

Component Details:-

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.

PADI

(Passenger Airbag Deactivation Indicator):- Passenger Airbag Deactivation Indicator is provided in the Fascia

Switch or in SBR display & gives the visual indication to the occupants on the deactivation status of the Passenger

Airbag. This indication will glow, if the Passenger Airbag is deactivated.

PADS

(Passenger Airbag Deactivation Switch):- Passenger Airbag Deactivation (PAD) Switch is provided on the left

side of dashboard. Passenger Airbag should be deactivated if a child is seated in the Front Passenger seat (Since, in

case of an impact, the deployed airbag will hit the child directly on his head with a heavy force, which can be

dangerous to the child). Passenger Airbag can be deactivated by turning the PADS switch in anti -clockwise direction

using the Ignition Key. It can be re-activated by turning the PADS switch in clockwise direction using the Ignition key.

SBR Display

:- SBR (Seat Belt Reminder) display gives visual indication to the occupants regarding the Seat belt

buckle status of front & rear passengers & also the PAD Switch status.

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:-