Defender. Manual — part 259
The window lift system will only operate when the ignition switch is in position II (ignition on) and features anti-trap
functionality.
The rear window lift system (if fitted) comprises a handle and manually operated door window regulator in each rear
door.
Heated Windshield and Rear Window
The heated windshield contains a single heating element which is powered for up to a maximum of 8 minutes when
selected. The system is only operational when the engine is running.
The heated rear window also contains a single heating element and will operate with the ignition switch in position II
(ignition on). The heated rear window isn't constrained to an operational time limit.
PRINCIPLES OF OPERATION
Window Lift
The window lift relay coil is energized by an ignition feed from the central junction box (CJB). The energized relay
provides a battery voltage feed to the left-hand (LH) and right-hand (RH) window lift switches.
Each window lift switch has 2 connections with its respective window lift motor; feed and return. These lines switch
depending on the direction of travel requested using the switch. In each case, the motor is provided a ground path
through its switch.
Each motor has thermal cut-out protection. If the window reaches the top or bottom of its travel, or hits an obstruction,
the thermal cut-out will sense the increased load on the motor and cut the power supply to the motor brush contacts.
Thermal cut-out time is between 3.5 to 5 seconds, with a re-start time of between 1 to 10 seconds.
Heated Windshield
Operation of the heated windshield is controlled by the heated windshield module. The heated windshield module is
located behind the instrument cluster and receives an engine running signal from the engine control module (ECM). The
heated windshield module also monitors the condition of the heated windshield switch. If the switch is pressed, a ground
path is created. If both these signals are in place, the heated windshield module provides a feed to the heated windshield
element until either;
the switch is pressed a second time
8 minutes elapses
or the engine is stopped.
Heated Rear Window
The heated rear window switch is located in the center console and is provided an ignition feed from the CJB. When the
switch is pressed, a feed is provided to the heated rear window relay coil. The now energized heated rear window relay
provides a battery voltage feed from the CJB to the heated rear window element.
Glass, Frames and Mechanisms - Front Door Window Glass
Removal and Installation
Removal
1. Remove front door reinforcement panel.
For additional information, refer to:
Front Door Reinforcement
Panel
(501-03 Body Closures, Removal and Installation).
2. Remove window regulator.
For additional information, refer to:
Front Door Window
Regulator and Motor
(501-11 Glass, Frames and Mechanisms,
Removal and Installation).
3. Push glass up to top of its travel and support with a suitable
length of timber.
4. Remove 2 self tapping screws securing window glass
runner on latch side of door and single screw from hinge
side.
5. Taking care not to damage paint, prise exterior waist
5. Taking care not to damage paint, prise exterior waist
weather strip from door.
6. Remove timber support and lower glass to bottom of door.
7. Ease runner from glass at hinge side of door, lift glass over
bottom edge of door and withdraw.
Installation
1. Insert glass into runners at an angle as illustrated.
1. Insert glass into runners at an angle as illustrated.
2. Whilst lifting glass, position it squarely in runners, raise to
top of travel and insert timber support.
3. Secure hinge side runner with single screw ensuring that
packing strip is in position.
4. Locate packing strip and secure opposite runner with 2
screws. Ensure that all 3 screw heads are well below bottom
of runners to prevent damage to glass.
5. Locate regulator in window lift channels.
6. Install window regulator.
For additional information, refer to:
Front Door Window
Regulator and Motor
(501-11 Glass, Frames and Mechanisms,
Removal and Installation).
7. Install front door reinforcement panel.
For additional information, refer to:
Front Door Reinforcement
Panel
(501-03 Body Closures, Removal and Installation).
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