landrover Workshop Repair Guides

Land Rover Workshop Service and Repair Manuals

Description - SRS|Page 1067 > < Description - SRS|Page 1065
Page 908
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RESTRAINT SYSTEMS

DESCRIPTION AND OPERATION

75-5

Passenger airbag module

The passenger airbag module is located in the instrument panel above the glove box and is controlled by the DCU.  
A bag within the module inflates to protect the passenger in the event of a collision severe enough to deploy the 
system.  

Within the passenger airbag module is a squib which, when given the correct current by the DCU, inflates the airbag 
by initiating a chemical reaction.  In deployment, the airbag inflates within a fraction of a second and then deflates at 
a controlled rate as the weight of the passenger presses against the bag.  Vents in the bag control airbag deflation.

The DCU regularly applies a test current to the passenger airbag squib to confirm continuity of the ignition circuitry.

The DCU is capable of detecting a short to ground, a short to battery and an open circuit for the passenger airbag 
module squib.  It will also identify if the configuration of the DCU differs from that actually fitted to the vehicle.

The DCU also stores the following additional information on each fault:

l

A count indicating the number of times the fault has occurred.

l

A start time and an end time for the fault to indicate duration of the fault.

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