Doors - Description & Operation Land Rover Range Rover III

Scheme 98

General

The door structure and skins are manufactured from aluminum alloy and are fitted with an impact resistant plastic panel, finished in the body color scheme, bolted to the lower external door skins.

The doors are attached to the door posts by two hinges. A door brake, with a metal retaining strap, is fitted between the door and body frame to restrict the angle that the doors open.

Structurally, the difference between the front and rear doors is the extruded aluminum alloy Side Impact Protection bar fitted to the front doors. The rear doors have, in addition to the window, a fixed quarter light.

The external door handles are bolted to the door structure and are accessed by removing the door trim casing.

The rear doors are each fitted with a manually operated child protection safety lock.

Scheme 99

Fitted within the door structure, is the window regulator and glass, door locking mechanism, door wiring harness and speakers. A molded foam sound insulation panel, secured with a non-curing sealant, is fitted between the inner door skin and trim casing. Between the door actuator and lock is a Bowden cable, protected by an insulated sleeve. The audio system, electric windows and door locking system are serviced by an electric wiring harness.

Trim Casing

The trim finish is dependent on the vehicle option level, either color matched to the vehicle interior trim or leather finished.

The trim casings are secured by screws and retaining studs. A molded sound insulation panel is attached to the door internal structure with a non-curing sealant.

All four doors have speaker grilles integral with the door trim, a switch to operate the door window mechanism, a recessed sill lock button, arm rest and door handle.

The driver's door trim casing is fitted with a switch pack linked to the Body Control Unit (BCU) via the P-Bus. This controls all four windows, and includes an isolation switch for the rear door windows, the door mirrors and the central locking system.

In addition to the side protection bars, to protect the front seat occupants, a side impact air bag is stowed in the front trim casings.

Door Locking

Controlled by the BCU, the Central Door Locking (CDL) system controls the door locks. The CDL system for each door consists of

1. Door lock
2. Actuator
3. Recessed sill lock button.

The CDL system is operated by the remote handset externally from the driver's door lock or from the CDL switch positioned on the fascia below the hazard warning switch. A safety feature prevents the doors from opening when a set vehicle speed is exceeded (10 mph/16 kph).

Note. The operation of the door locks by any other means (for example the interior locking switch on the fascia panel) will unlock the doors.

Single point entry is a security feature that enables the driver's door only to be unlocked using the remote handset or key. By pressing the remote handset button once, or turning the key towards the front of the vehicle, the driver's door only unlocks. By pressing the button on the remote handset or turning the key a second time, all the doors are unlocked.

If the vehicle is unlocked using a single point entry, and if the CDL switch on the fascia is pressed, the driver's door will relock. Pressing the CDL switch a second time unlocks all the doors.

Door Mirrors

The external folding mirrors, bolted to the front door structure, are supplied with the following features

1. Driver's door - plane mirror glass
2. Passenger door - convex mirror glass
3. Electric adjustment
4. Mirror heating
5. Electrochromic mirror (optional extra)
6. Mirror memory and automatic kerb facility (optional extra)
7. Folding function (Japan only/optional extra)
8. Entrance lighting (optional extra).

Control of the external mirrors is by the BCU. Each mirror is connected to it's door module via a link harness.

Door Module Harness Connectors C2271 LH and RH Pin Details

Door Module Harness Connectors C2271 LH and RH Pin Details

Door Mirror Harness Connectors C0352 and C0353 Pin Details

Door Mirror Harness Connectors C0352 and C0353 Pin Details

Scheme 100

1. Mirror adjustment multi-directional switch
2. LH/RH mirror selection switch

The door mirrors are selected by moving the mirror selection switch. Moving the switch to the left allows LH door mirror adjustment. Moving the switch to the right allows adjustment of the RH door mirror.

Movement of the mirror glass in the horizontal and vertical axis is by a dual-motor drive operated by the mirror adjustment multi-directional switch.

There is a maximum adjustment operating time of 10 secs.

Mirror Memory

Available as optional equipment, the seat, mirror and steering column memory functions are integrated in the BCU.

The driver's and front passenger door modules control the mirror memory while the "Seat Memory" peripheral module controls the seat and steering column memory.

Located on the outboard side of the driver's seat plinth, the memory switch and memory pre-set buttons can store three different mirror positions. When a position is stored or recalled, the information is transmitted to the BCU via the K-bus. It is then relayed to the switching centers via the P-bus. Each switching center evaluates the recalling and storage commands transmitted via the P-bus for positions 1 to 3 and performs the necessary adjustments.

If a manual adjustment is selected while the mirror memory is operating, it will over-ride the memory recall function.

For mirror memory to operate, the mirror adjustment potentiometers must deliver a voltage value in the range from 80 mV - 4.8 V. Should a voltage applied be outside of this range the mirror will not operate when memory is selected.

Automatic Mirror Tilting (Kerb View)

If reverse gear is selected when the ignition is at position I or II, the passenger door mirror dips to provide a better view of the kerb. The mirror returns to it's original position immediately reverse gear is disengaged.

The kerb view mirror position can be adjusted using the mirror adjustment multi-directional switch when reverse gear is selected and the ignition is at position I or II.

Mirror Heating

Mirror heating on the driver's and front passenger's doors is controlled by the respective door modules.

The BCU receives the outside temperature value via the K-bus. This outside temperature value is converted to a switch on-time percentage according to the following table and then transmitted via the P-bus to the two door modules. Mirror heating is active with the ignition at position II.

If the wiper is switched on, the switch on-time percentage is raised in accordance with the following table.

TEMPERATURE SPECIFICATION TABLE

If the park heat function (if fitted) is selected, mirror heating is automatically selected.

Scheme 101

1. Mirror fold button

The mirror fold function, standard for Japan and available as optional equipment for other markets, enables the mirrors to be electrically folded.

The MIRROR FOLD button is located in the switching center of the driver's door for operation of the fold-in mechanism for both outside mirrors. When the MIRROR FOLD button is pressed, both mirror drives are driven in the fold-in direction by the relevant switching center.

If the MIRROR FOLD button is pressed again, the two door mirrors are returned to their original positions.

Since it is possible, with frequent mirror fold-in operations, to cause the mirror motors to overheat, a repeat lockout facility is provided.

If the MIRROR FOLD button is pressed more than 5 times within 1 minute, the mirrors will extend and the mirror fold-in feature is disabled for 3 minutes.

Scheme 102

The steel tail door is of a two-piece horizontally split design.

The upper tail door, attached to the body with zinc coated hinges, is supported, when fully open, by two gas struts. The tinted, heated rear window is bonded to the window aperture.

Bolted to the upper tail door, and accessed by removing the upper trim panel, are the fixed spoiler, a suppressor and a centrally mounted single blade wash/wipe assembly. The fixed spoiler is fitted with a high level brake light and an optional multi-band telephone antenna.

Fitted to the upper tail door lower sill, accessed by removing the lower trim panel, is the upper tail door latch and locking mechanism, operated by a flush fitting switch located between the two number plate lights. To illuminate the loading area two lights are fitted to the lower trim panel. A "P"-section rubber weather seal is fitted to the lower sill.

The lower tail door is mounted on two spring-damped hinges and supported, when lowered, by two straps. A carpeted sprung-flap seals the gap between the tail door and the luggage area. Centrally mounted, is the striker plate for the upper tail door.

The two lower tail door locks engage the laterally mounted striker plates fitted on the vertical tail door frames, and are operated by a switch that can be accessed when the upper tail door is in the open position.

Tail Door Operation

The components for the tail door locking system are

1. Upper tail door external push-button
2. Lower tail door internal push-button
3. CDL button on center console
4. Upper tail door actuator
5. Lower tail door actuators, fitted directly to locks
6. Relay for upper tail door actuator
7. Relay for lower tail door actuators.

Upper Tail Door Button

The upper tail door can be opened electrically by pressing the taildoor release button on the remote handset, the external switch located between the number plate lamps or by pressing the tail door release button on the fascia.

Upper Tail Door

The centrally mounted upper tail door lock can be operated by either the tailgate mounted switch, the remote handset or the tail gate release button mounted on the central console.

In an emergency, or when there is no electrical power, the upper tail door can be manually unlocked by pulling a cable attached to a plastic toggle located in the upper tail door trim panel.

Lower Tail Door

The lower tail door is released by the operating switch fitted to the upper sill and is only accessible with the upper tail door open.

Scheme 103

Actuators

The actuators are accommodated in their respective CDL units and powered by relays.

Relays

The relay for the upper tail door is integrated in the BCU.

The relay for the lower tail door is fitted at the RH rear of the load space.

Lower Tail Door Locks

Each of the two lateral locks is directly fitted to it's respective actuator. Fitted to the top of each lock is a manual release lever.

The operating logic for controlling the tailgate locking system is a function of the BCU.

Note. It is possible to open the tail door with the remote control irrespective of the vehicle central locking status At vehicle speeds > 5 mph (8 km/h) it is not possible to operate the tail door. This facility prevents inadvertent operation while driving.

The tail door is released by a special central locking unit with return spring shuttle.

To unlock/release the tail door, the CDL unit is powered directly for 0.7 seconds via a load switching relay in the BCU.

The table below shows the functions of the upper tail door for which the central locking unit is activated.

UPPER TAIL DOOR FUNCTIONS TABLE

Power is applied to the actuator in the CDL unit and the tail door opens.

The return spring in the CDL unit re-establishes the initial position of the CDL unit.

The lower tail door is opened by a special CDL unit with return spring (shuttle).

The CDL unit is activated by the BCU via a load switching relay and power is applied for 0.7 seconds.

The actuator releases the tail door lock so that the lower tail door can be opened. After power has been applied, the return spring resets the CDL unit to its initial position.

The table below shows the functions of the lower tail door for which the CDL unit is activated.

LOWER TAIL DOOR FUNCTION TABLE

Repeat Lockout

A repeat lockout facility similar to the repeat lockout function of the CDL is used in order to protect the motors from thermal overload in the event of the tail door being locked/unlocked too often in succession.

See also:
• MIRROR FOLD