Freelander System Description and Operation
CONTROL UNITS
86-3-4
DESCRIPTION AND OPERATION
Heated Rear Window (HRW)
The CCU controls the operation of the HRW. When the HRW switch, located on the centre of the fascia, is pressed
and released a signal is sent to the CCU. With the ignition on, the oil pressure sense present (i.e. the engine running),
the tail window not lower than the 'clear of seal' position and, on 3 door models the roof closed/on, the CCU will grant
the HRW on. The CCU will energise the HRW relay for approximately 15 minutes after which the CCU will de-energise
the HRW relay. A warning lamp in the HRW switch shows when the HRW is operating.
If the switch is pressed before the timed 15 minute period, the CCU will immediately switch off the HRW. Removal of
any of the input signals to the CCU will also stop HRW operation. The HRW switch will require re-selection to operate
again.
Heated Windscreen
Operation of the heated windscreen is controlled by the CCU and a non latching switch on the centre console. The
switch contains a LED which illuminates while the heated windscreen is on. Power for the heater elements is supplied
by a relay, on the inboard side of the E-box, controlled by the CCU. Two fuses next to the relay provide electrical
protection for the heater elements.
When the heated windscreen switch is pressed, the CCU energises the heated windscreen relay, provided the engine
is running, to connect a battery power feed to each of the heater elements. The feed to the RH heater element also
provides the power feed to illuminate the LED in the heated windscreen switch.
The CCU de-energises the heated windscreen relay after approximately 5 minutes, when the switch is pressed again,
or if the engine stops.
Tail Door Latch
The tail door latch is operated by a tail door lock motor controlled by the CCU. When the CCU receives an open
request from the tail door handle switch, it energises the tail door lock motor for 440
±
40 milliseconds provided the
vehicle is in the following configuration:
l
The door locking system is in the unlocked state.
l
The alarm system is disarmed.
l
Road speed is less than 3
±
1 mph (5
±
1.5 km/h).
The position of the ignition switch has no effect on the operation of the tail door lock motor.
Window Lift
Power for side door window operation is supplied from the window lift relay and, on 5 door models, the auxiliary relay,
both located in the passenger compartment fusebox. The CCU controls the relays, which are energised while the
ignition switch is in position II and for approximately 40 seconds after the ignition is turned off.
WINDOWS, DESCRIPTION AND OPERATION, Description.
Seat Heating
Power for the seat heaters is supplied from the auxiliary relay in the passenger compartment fusebox. The CCU
controls the auxiliary relay, which is energised while the ignition switch is in position II and for approximately 40
seconds after the ignition is turned off.
Daytime Running Lamps
The daylight running feature is controlled by the CCU via two daylight running relays located inboard of the passenger
compartment fusebox. The CCU switches the relays, to illuminate the dipped beams, side lamps, tail lamps, rear
number plate lamp and side marker lamps, when the following conditions are met:
l
The engine is running.
l
Gearbox selector lever not in Park.
l
Headlamps not selected on.
The CCU and the daylight running relays are also used to operate the head/side lamps when they are selected on
using the lighting switch on the LH column stalk. The lamps then operate as on non daylight running vehicles, and
remain on when the gearbox is in Park and when the engine is switched off.