L322 Range Rover System Description and Operation
SECURITY
86-5-12 DESCRIPTION AND OPERATION
Tilt Sensor
The tilt sensor monitors for changes of vehicle attitude while the alarm is armed. The tilt sensor is installed under the
passenger seat in the BCU bracket.
The tilt sensor incorporates a two axis sensor controlled by a microprocessor. A permanent battery feed from the
passenger compartment fusebox powers the tilt sensor. The BCU activates and de-activates the tilt sensor when it
arms and disarms the alarm system. The tilt sensor receives activation and de-activation signals from the BCU.
The tilt sensor measures the longitudinal and transverse angles of the vehicle over a range of
±
16
°
from the horizontal.
When the tilt sensor is activated, it stores the current angles in memory. If the vehicle changes attitude in either
direction by more than the limit the tilt sensor sends an alarm signal to the BCU, which triggers the BBUS. After an
alarm, the alarm limit is reduced to make the system more sensitive to any further change of attitude.
Alarm Triggering Limits
Each time the tilt sensor is activated it performs a self test. If there are no faults the tilt sensor sends an
acknowledgement signal to the BCU. If the BCU does not receive the acknowledgement signal it de-activates the tilt
sensor.
Tilt Sensor Harness Connector
Tilt Sensor Harness Connector C0960 Pin Details
Alarm
Limit, Degrees
Longitudinal
Transverse
First alarm
1.2
±
0.55
1.4
±
0.55
Second alarm
1.1
±
0.55
1.3
±
0.55
Pin No.
Description
Input/Output
1
Alarm indication
Output
2
Arm/Disarm signal
Output
3
Battery power supply
Input
4
Arm/Disarm signal
Input
5
Arm/Disarm signal
Output
6
Not used
–
M86 5981
C0960
