DESCRIPTION AND OPERATION
4.50 RANGE ROVER
Drivers Airbag
The drivers airbag can deploy in one of two stages, depending upon the severity of impact.
If a less severe impact is detected, stage 1 deployment is carried out. The SRS DCU
(C0256) provides a firing signal to the drivers airbag (C1254) via the rotary coupler (C0082)
on a YB then S wire. The SRS DCU (C0256) provides an earth path for the drivers airbag
(C1254) via the rotary coupler (C0082) on an LG then YN wire.
A split second later, the SRS DCU (C0256) provides a second firing signal to the drivers
airbag (C1254) via the rotary coupler (C0082) on an SN then U wire. The SRS DCU (C0256)
provides a second earth path for the drivers airbag (C1254) via the rotary coupler (C0082)
on a US then SB wire.
When stage two deployment is required, the SRS DCU provides simultaneous firing signals
to both squibs as described previously.
Passenger Airbag
The passenger airbag can deploy in one of two stages, depending upon the severity of
impact. If a less severe impact is detected, stage 1 deployment is carried out. The SRS DCU
(C0256) provides a firing signal to the passenger airbag (C0251) on a UN wire. The SRS
DCU (C0256) provides an earth path for the passenger airbag (C0251) on a UB wire.
A split second later, the SRS DCU (C0256) provides a second firing signal to the passenger
airbag (C0251) on a WB wire. The SRS DCU (C0256) provides an earth path for the
passenger airbag (C0251) on a WN wire.
When stage two deployment is required, the SRS DCU provides simultaneous firing signals
to both squibs as described previously
Door Airbags
The SRS DCU registers a side impact via the side impact sensors, which are mounted at
the base of the LH and RH B/C posts. The SRS DCU monitors the condition of the RH
sensor (C0951) and the LH sensor (C0950) on YR and YG wires respectively. Both sensors
are earthed on NB wires. When the SRS DCU registers a side impact above its threshold
level, it will fire the relevant door airbag.
The SRS DCU (C0256) provides a firing signal to the RH door airbag (C1499) on a U wire.
An earth path is provided by the SRS DCU (C0256) on an N wire.
The SRS DCU (C0256) provides a firing signal to the LH door airbag (C1499) on an N wire.
An earth path is provided by the SRS DCU (C0256) on a Y wire.
To Next Page
Loading...
