DESCRIPTION AND OPERATION
RANGE ROVER 4.49
SUPPLEMENTARY RESTRAINT SYSTEM (SRS)
DESCRIPTION
General
The Supplementary Restraint System (SRS) is controlled by the SRS Diagnostic Control
Unit (DCU) which is mounted on the transmission tunnel, to the rear of the gear selector
lever. The SRS DCU registers front and rear impacts via an integral accelerometer. Side
impacts are registered via two side impact sensors; one mounted on the base of the RH B/
C post, one mounted on the base of the LH B/C post.
The drivers and passenger airbags can be deployed in one of two stages. A lesser impact
will result in stage 1 deployment. Both the drivers airbag and the passenger airbag contain
two squibs. Stage 1 entails the SRS DCU delaying deployment of the second squib for a split
second. This results in a less severe deployment of the airbags. A larger impact will result
in stage 2 deployment. This entails both squibs within the drivers and passenger airbags
being deployed simultaneously.
Front head airbags are also mounted in the 'A' post. These work in conjunction with the door
mounted airbags. Rear head airbags, mounted in the 'D' post are available as an option.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 53 of the passenger
compartment fuse box (C0632) on an R wire. Fuse 53 (C0583) is connected to the ignition
switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) by an R wire. When the ignition
switch is turned to the 'auxiliary' position, current flows across the switch (C0099 on Td6
vehicles, C0028 on V8 vehicles) to fuse 44 of the passenger compartment fuse box (C0585)
on a PB wire. Fuse 44 (C0586) provides an auxiliary ignition feed to the following:
l The SRS DCU (C0256) on a PU wire.
l The LH seat belt buckle switch (C0100) on a PG wire.
l The RH seat belt buckle switch (C0260) on a PG wire.
l The occupancy detector sensor (C0962) on a PG wire.
To Next Page
Loading...
