Servicing the Range Rover Sunroof
SUNROOF
76-6-2
DESCRIPTION AND OPERATION
Sunroof
General
The sunroof is electrically operated by a three-way switch co-located with the forward interior light assembly. The
sunroof drive unit, operating the sunroof panel to the tilt or open positions, is actuated by the integrated sunroof control
electronics.
The sunroof frame is bolted to mounting points on the roof panel. The frame, constructed from pressed steel, supports
all the sunroof components.
A rubber gaiter is fitted between the sides of the glass panel and drive assembly. The gaiter, reducing wind noise with
the sunroof in the tilt position, conceals the drive linkage.
The sunroof drive unit, accessible by removing the motor access panel (integral with the forward interior light
assembly), is mounted ahead of the roof segment between the roof liner and lower frame section of the sunroof. It
comprises a motor with add-on reduction gear (worm drive), two Hall-effect integral position sensors and integrated
control circuit. The software within the integrated control unit is configured to meet individual national regulations. It
is connected by a 13–pin multiplug to the P-Bus.
The worm drive drives a gear in a cast housing attached to the end of the motor. The gear has a small pinion gear
attached to the outer part of its spindle. The pinion engages with the spiral cables to form a rack and pinion drive.
Rotation of the motor turns the pinion which in turn drives the cables in the required direction.
The two cables are attached either side of the pinion. One end of each cable is attached to the guide. The opposite
end is clamped in its position on the pinion by a riveted bracket. The cables run in metal tubes to the guides. As the
sunroof panel is closed, the cables are pulled through the metal tubes. The displaced cable is guided into plastic tubes
which protect the cable and prevent it snagging. The cables are made from rigid spring steel and therefore can push
as well as pull the sunroof along the guides.
A sunshade is also located in the guides. When the sunroof panel is opened or tilted, the sunshade moves rearward.
When the sunroof panel is opened, two brackets on the sunshade engage with the panel as it is retracted. The
sunshade is then pulled back by the retracting panel. When the panel is closed, the sunshade remains retracted until
pulled manually to its closed position.
Drain hoses are connected to the front and rear corners of the frame. The drain hoses are located inside the 'A' and
'D' post pillars to allow water which has collected in the frame to escape. A one-way valve is fitted to the end of each
drain hose to prevent the ingress of dirt and moisture.
Servicing
Servicing is limited to adjusting the glass panel and replacing the drive unit. The drive unit is accessed by removing
the access panel fitted to the forward interior light panel.
