L322 Range Rover System Description and Operation
RESTRAINT SYSTEMS
DESCRIPTION AND OPERATION
75-9
Seat Occupancy Module
The seat occupancy module is installed on the underside of the front passenger seat. The module supplies a power
feed to the seat occupancy sensor and monitors the return voltage to determine if the seat is occupied or not. The
result is transmitted to the DCU as a serial data message. The seat occupancy module also monitors for short and
open circuits in the seat occupancy sensor. If it detects a fault, the seat occupancy module transmits a fault message
to the DCU in place of the status message.
Seat Belt Switches
On NAS vehicles, a seat belt switch is installed in the buckle of each front seat belt to provide the DCU with a status
signal of the related seat belt(s). When the seat belt is unfastened the switch is open circuit. When the seat belt is
fastened the switch is closed and connects a battery power signal to the DCU.
NOTE: In some other markets vehicles have a seat belt switch in the buckle of the driver seat only. On these vehicles
the input from the seat belt switch is used for the seat belt warning function, but not for the SRS.