Doors, Hood and Trunk: Description and Operation
Handles, Locks, Latches and Entry Systems
COMPONENT LOCATION (SHEET 1 OF 2)
NOTE: Left-Hand Drive (LHD) shown; Right-Hand Drive (RHD) similar.
COMPONENT LOCATION (SHEET 2 OF 2)
NOTE: LHD shown; RHD similar.
OVERVIEW
All the vehicle hinged panels are secured by latches with mating strikers. The latches incorporate panel ajar switches that will inform the driver of an open access point.
The central locking system is operated by either the remote handset, front door central locking buttons or the instrument panel central locking switches. The central locking system controls the automatic locking and unlocking of the vehicle entry points. The software used to control the central locking system is incorporated within the CJB.
The central locking system is also integrated with the interior lighting function. The interior lights and exterior mirror lamps are illuminated via the RF receiver and CJB following a valid unlock request from the remote handset.
If configured by the dealer, the exterior door mirror power fold function is also operated by the central locking system.
A concealed mechanical door lock is provided in the front LH door exterior handle, and is used to gain access to the vehicle if the battery is discharged or the central locking system fails.
DOOR LATCHES
The door latches are installed at the rear edge of each door and engage with corresponding strikers mounted to the 'B' and 'C' pillars. Each interior and exterior door handle is connected with a release cable to the corresponding door latch. In the front LH door a third release cable is connected between the door latch and the concealed emergency mechanical door lock.
Each door latch is a sealed unit that comprises the following:
^ Lock motor
^ Double lock motor (all except North American Specification (NAS), Japan and Gulf vehicles)
^ Door ajar switch.
An electrical connector is incorporated in each door latch and provides the interface with the door control module, CJB, and AJB. The front door control modules are connected to the CJB on the medium speed Controller Area Network (CAN) bus; the rear door control modules are connected via the Local Interconnect Network (LIN) bus to the front door control modules. Power supply for the door latch lock and double lock motors is provided from the AJB.
The lock and double lock motors control the engagement of the door latches with the release cables to lock and unlock the vehicle. When the vehicle is locked, the lock motors disengage the door latches from the exterior release cables. When the vehicle is double locked, the double lock motors also disengage the door latches from the interior release cables. When the vehicle is subsequently unlocked, the interior and exterior release cables are re-engaged with the door latches.
All the door interior release handles incorporate a locking button. When a front door central locking button is pressed/pulled, all the vehicle doors will centrally lock/unlock. When a rear door locking button is pressed/pulled, the locking button will only lock/unlock the activated rear door.
When the door locking button is pressed, the interior release cable is pushed and causes the exterior release cable to be disengaged from the door latch. On the rear doors, pressing the locking button will also disengage the interior handle from the interior release cable.
When the door locking button is pulled away from the door, the door interior release handle is re-engaged with the interior release cable. As the interior release cable is re-engaged it is pulled, causing the door latch to re-engage with the exterior release cable.
Rear Door Child Locks
The rear door latches incorporate child locks that provide additional rear occupancy safety. The child locks are manually operated using the emergency key blade within the remote handset. Setting the child lock to the locked position will disengage the door latch interior release cable from the door latch, and prevent opening of the rear door using the interior release handle.
For further information on child locks, refer to the Owners Handbook.
Door Ajar Switch
An ajar switch is installed in each door latch and is hardwired to the CJB. If the ignition is in power modes 4 (Accessory) or 6 (Ignition) and a door is opened or is not fully closed, the corresponding door ajar switch is opened to disconnect the ground from the CJB. A message is transmitted by the CJB via the medium speed CAN bus to the instrument cluster, to inform the driver that a door is ajar.
On vehicles with a low-line instrument cluster the door ajar symbol is illuminated.
On vehicles with a high-line instrument cluster, the door ajar symbol is illuminated and a message is also displayed in the message center.
The door ajar switch is also integrated with the vehicle security system and is used as the detection device for unauthorized vehicle entry.
Emergency Mechanical Door Lock
The remote handset contains an emergency key blade, concealed in the key fob. The front LH exterior door handle incorporates a mechanical operated door lock that is concealed behind a removable plastic cover. The door lock allows the front LH door to be mechanically unlocked and locked using the emergency key blade in the event that the remote central locking operation fails, or a vehicle power failure occurs.
When the mechanical door lock is used the central locking system will not operate, and if already armed the vehicle alarm will sound when the door is opened. The vehicle is not able to be double locked, or the alarm system armed using the emergency key blade.
HOOD LATCHES
The hood is secured in the closed position by 2 latches located on each side of the hood latch panel. The hood release lever is located below the instrument panel on the LH 'A' pillar and is connected with a cable to the hood latches. Operation of the hood release lever will open the 2 hood latches and release the hood.
A mechanically operated safety hook is installed at the front center of the hood. The safety hook prevents the hood from fully opening in the event that the hood latches are open, and the vehicle is in motion. The safety hook is spring operated to bias the hook to the latched position, and is formed with a lever plate. The lever must be pressed to release the safety hook from the mating latch plate when the hood is to be fully opened.
Hood Ajar Switch
The RH hood latch incorporates the hood ajar switch that is hardwired to the CJB. If the ignition is in power modes 4 (Accessory) or 6 (Ignition) and the hood is opened or is not fully closed, the hood ajar switch is opened to disconnect the ground from the CJB. A message is transmitted by the CJB via the medium speed CAN bus to the instrument cluster, to inform the driver that the hood is ajar.
On vehicles with a low-line instrument cluster the hood ajar symbol is illuminated.
On vehicles with a high-line instrument cluster, the hood ajar symbol is illuminated and a message is also displayed in the message center.
The hood ajar switch is also integrated with the vehicle security system and is used as the detection device for unauthorized vehicle entry.
LIFTGATE LATCH
The liftgate latch is mounted at the bottom center of the liftgate interior body panel and is a fully electrically operated unit. The liftgate latch incorporates the liftgate lock motor, and receives a power supply via a hardwired connection from the CJB. A release microswitch is housed within a touch-pad that is located on the underside of the liftgate exterior handle.
The liftgate latch is released by the CJB when the vehicle is stationary and either the remote handset button is pressed, or the exterior handle touch-pad is applied. The liftgate latch is also released when the instrument panel central locking switches are simultaneously pressed for 3 seconds, and the vehicle speed is less than 8 km/h (5 mph).
Liftgate Ajar Switch
The liftgate latch also incorporates the liftgate ajar switch that is hardwired to the CJB. If the ignition is in power modes 4 (Accessory) or 6 (Ignition) and the liftgate is opened or is not fully closed, the liftgate ajar switch is opened to disconnect the ground from the CJB. A message is transmitted by the CJB via the medium speed CAN bus to the instrument cluster, to inform the driver that the liftgate is ajar.
On vehicles with a low-line instrument cluster the liftgate ajar symbol is illuminated.
On vehicles with a high-line instrument cluster, the liftgate ajar symbol is illuminated and a message is also displayed in the message center.
The liftgate ajar switch is also integrated with the vehicle security system and is used as the detection device for unauthorized vehicle entry.
FUEL FILLER DOOR ACTUATOR
The fuel filler door is electrically locked and unlocked with an actuator and plastic pin. The actuator is located behind the fuel filler door housing, and operates the pin to engage or release a spigot on the door mounting hinge arm.
The fuel filler door actuator is hardwired to the CJB and is operated by the vehicle central locking system. The CJB reverses the polarity of the actuator power and ground connections, allowing the pin to move in both directions for locking and unlocking. When unlocked, the fuel filler door is manually opened to gain access to the fuel tank filler cap.
CENTRAL LOCKING SYSTEM CONTROLS
The central locking system provides the driver with control over the locking and unlocking of the vehicle entry points, from inside or outside the vehicle. Manual operation of the central locking system is achieved using the following:
^ Remote handset and RF receiver
^ Front door central locking button
^ Instrument panel central locking switches.
Remote Handset
The remote handset is a sealed waterproof unit that contains a Printed Circuit Board (PCB), transponder and a rechargeable battery. The remote handset battery is charged whenever the remote handset is located in the start control unit, and the engine is running.
The remote handset contains an emergency key blade, concealed in the key fob. The emergency key blade is used to access the vehicle through the LH front door if the central locking system fails. The emergency key blade is also used to enable or disable the rear door child locks, and to disable the passenger airbag.
The remote handset is identical for all vehicle specifications, but differs in the preset frequency and power that the remote handset operates. The remote handset for each vehicle specification is identified by a suffix change to the base part number as follows:
Each remote handset features a unique identification code that is programmed within the integral transponder. The RF signal produced by the remote handset contains the unique identification code and also a rolling code. During vehicle production, the unique identification codes of the valid remote handsets are programmed into the CJB, and the rolling codes are also synchronized with the CJB.
When the remote handset is operated, the CJB checks the unique identification and rolling code. The CJB will only respond if the RF signal produced is from a valid remote handset for the vehicle.
A total of 30 'slots' are available in the CJB software to allow for replacement, and the addition of remote handsets. In service, the Land Rover approved diagnostic system may be used to communicate with the CJB for the following:
^ Identification of remote handset allocation within the CJB.
^ Enabling of new remote handsets.
^ Disabling of existing remote handsets.
^ Re-enabling a previously disabled remote handset.
If the remote handset rolling code loses synchronization with the CJB, the remote handset functions will not operate. Synchronization between the remote handset and CJB is restored by starting the engine with the affected remote handset, and allowing the engine to run for a minimum of 6 minutes.
Additional buttons are located on the remote handset to provide convenience operation of the liftgate release, headlamp delay and panic alarm functions.
RF Receiver
The RF receiver is installed above the headlining, adjacent to the rear interior light. The receiver provides functionality for the remote central locking system, and is also used by the tire pressure monitoring system and interior lighting function.
The RF receiver is identical for all vehicle specifications, but differs in the preset frequency that the receiver operates. The RF receiver for each vehicle specification is identified by a suffix change to the base part number as follows:
The RF receiver converts the signals transmitted by the remote handset into digital messages, and then transmits the message via the LIN bus to the CJB.
A permanent power feed is supplied to the RF receiver by the CJB.
Front Door Central Locking Button
Both the front door interior locking buttons will activate the central locking function. When a front door central locking button is pressed/pulled, all the vehicle doors will centrally lock/unlock.
When a front door central locking button is pressed/pulled, the door control module on the activated door transmits the central lock/unlock request to the CJB. The CJB then transmits the central lock/unlock command to all the vehicle door control modules to lock/unlock all the vehicle doors.
The central locking feature using the front door central locking button is inhibited if either of the front doors is ajar. If a front door is ajar when a front door central locking button is pressed to lock the doors, the doors will lock and then instantly unlock.
Instrument Panel Central Locking Switches
Interior lock and unlock switches are located in the instrument panel to provide manual control of the vehicle central locking system. The switches are non-latching and allow all the vehicle entry points to be centrally locked or unlocked from inside the vehicle.
When the instrument panel central lock or unlock switch is pressed, a ground is connected to the CJB that energizes the lock or unlock motor in the door latches, liftgate latch and the fuel filler door actuator. The doors will only respond to the central lock/unlock command when they are fully closed. If a door is ajar the central locking feature is inhibited.
The liftgate latch will release when the instrument panel central locking switches are simultaneously pressed for 3 seconds, and the vehicle speed is less than 8 km/h (5 mph).
CONTROL DIAGRAM
NOTE: A = Hardwired; F = RF transmission; N = Medium speed CAN bus; O = LIN bus.
PRINCIPLES OF OPERATION
Central Locking System - Manual Operation
The central locking system provides the option of 2 or 3 manual locking modes, dependent on the vehicle specification. The locking modes are activated using the instrument panel central locking switches, front door central lock/unlock buttons, or the remote handset lock/unlock buttons:
^ Internally locked mode
^ Externally locked mode
^ Double locked mode (all except NAS, Japan and Gulf vehicles).
When the vehicle is externally locked, the CJB flashes the direction indicators once for 250 milliseconds. When the vehicle is double locked, the CJB flashes the direction indicators twice for 250 milliseconds with a 250 millisecond pause between flashes. When the vehicle is unlocked with the remote handset, the CJB flashes the direction indicator lamps twice for 250 milliseconds with a 250 millisecond pause between flashes.
The remote handset may be configured by the driver for single point entry or global entry, by simultaneously pressing the remote handset lock and unlock buttons for 4 seconds. The vehicle must initially be in an unlocked state and the remote handset recently removed from the start control module prior to the mode change. The direction indicators will flash twice for 250 milliseconds with a 250 millisecond pause between flashes to confirm the mode change. The vehicle will also lock and then unlock in the selected mode.
When single point entry is enabled, an unlock command from the remote handset will only unlock the driver's door, liftgate and the fuel filler door. To unlock the remaining entry points, a second unlock command from the remote handset or the instrument panel central unlock switch is required.
Additional options for speed dependent locking and automatic relocking modes may be configured by the dealer. All vehicles incorporate an automatically operated crash unlocking mode.
Internally Locked Mode
The internally locked mode is activated by a single press of the instrument panel central lock switch, or a single press of a front door central lock/unlock button. When in the internally locked mode:
^ The exterior door release handles are disengaged from the door latches to prevent opening of the doors from outside the vehicle.
^ The CJB disregards an open request from the liftgate exterior handle to prevent opening of the liftgate from outside the vehicle.
^ The vehicle may be unlocked by either a single press of the instrument panel central unlock switch, pulling a front door central lock/unlock button, or a single press of the remote handset unlock button. The vehicle will also unlock if the driver or front passenger door is opened.
Externally Locked Mode
The externally locked mode is activated by a single press of the remote handset lock button. When in the externally locked mode:
^ The exterior door release handles are disengaged from the door latches to prevent opening of the doors from outside the vehicle.
^ The CJB disregards an open request from the liftgate exterior handle or the instrument panel central locking switches to prevent exterior opening of the liftgate and doors.
^ The fuel filler door actuator is energized to lock the fuel filler door.
^ The vehicle may be unlocked by a single press of the remote handset unlock button.
Double Locked Mode
The double locked mode is activated by pressing the remote handset lock button twice within 3 seconds. When in the double locked mode:
^ The interior and exterior door release handles are disengaged from the door latches to prevent opening of the doors from inside or outside the vehicle.
^ The fuel filler door actuator is energized to lock the fuel filler door.
^ The CJB disregards an open request from the liftgate exterior handle and the instrument panel central locking switches, to prevent opening of the liftgate and doors.
^ The vehicle may be unlocked with a single press of the remote handset unlock button.
For all UK, Europe and ROW specification vehicles, a single press of the remote handset lock button will externally lock the vehicle to disengage the exterior handles, and will arm the active anti-theft system.
For NAS, Japan and Gulf specification vehicles, a single press of the remote handset lock button will externally lock the vehicle to disengage the exterior handles, and will arm the active and passive anti-theft system.
For all vehicles except NAS, Japan and Gulf specifications, pressing the remote handset lock button twice within 3 seconds will double lock the vehicle to disengage the interior and exterior handles, and will arm the active and passive anti-theft system.
Central Locking System - Automatic Modes
The central locking system features automatic modes to control the vehicle entry points, and provide protection for the system components.
The central locking system incorporates the following automatic modes:
^ Mislock mode
^ Speed dependant locking mode (if programmed)
^ Crash unlocking mode
^ Repetition blocking mode
^ Lockout protection mode
^ Automatic relock mode (if programmed)
^ Transport mode.
Mislock Mode
A mislock occurs if the CJB receives an external lock or double lock request when a hinged panel is ajar. To indicate a mislock the CJB sounds the horns to produce a 100 millisecond 'chirp'.
If a mislock occurs due to an external lock request when a hinged panel is ajar, the CJB will not carry out a lock request on any access points.
Speed Dependant Locking Mode
When speed dependant locking is enabled the CJB will internally lock all the doors when the vehicle speed exceeds 8 km/h (5 mph) with all the doors closed and the engine running. If the driver or front passenger door is opened and then closed, when the vehicle slows down or stops and then increases to more than 8 km/h (5 mph) again, the CJB will internally lock the doors.
Speed dependant locking may be enabled or disabled by the dealer using the Land Rover approved diagnostic system.
Crash Unlocking Mode
With the ignition in power mode 6 (Ignition), if a crash occurs that triggers deployment of the air bags, then the CJB will unlock all of the doors. The CJB is informed of the crash by a status message from the Restraints Control Module (RCM) on the medium speed CAN bus that changes from 'no crash' to 'crash'.
The central locking system will also perform crash unlocking mode if a 'no crash' status message is not received from the RCM every 500 milliseconds.
Repetition Blocking Mode
To protect the central locking system motors and actuators against system mis-use, the CJB incorporates repetition blocking to limit the maximum operating rate of each motor and actuator. The lock motor in each door latch also incorporates thermal protection.
Central Locking System Motor and Actuator Operating Parameters
Lockout Protection Mode
The vehicle is not able to be locked using a front door central locking button or instrument panel central locking switch if any door is open.
If an internal lock request is received from either of the front door central locking buttons, the CJB will centrally lock the vehicle and then centrally unlock the vehicle if any door is open.
If a front door is open and the open door central locking button is pressed and held in the locked position, the open front door may remain in the locked state. When the open door is subsequently closed, the CJB will centrally unlock all doors.
Automatic Relock Mode
Automatic relock prevents accidental operation of the remote handset buttons that will unlock and disarm the vehicle.
When the central locking system is unlocked using the remote handset, and a door or liftgate is not opened or the remote handset is not placed in the start control unit within 1 minute, the CJB will automatically lock or double lock the vehicle again, depending on the previously locked mode.
Transport Mode
All new vehicles are delivered from the factory in transport mode. Transport mode replaces the traditional transit relay and inhibits a number of electrical systems and features to reduce quiescent drain from the battery during delivery. When the vehicle is in transport mode 'transp' is displayed in the instrument cluster odometer. Single point entry is enabled and global locking and unlocking using the remote handset is disabled.
The speed locking mode is also disabled, but crash unlocking mode remains enabled.
To remove the vehicle from transport mode, the Land Rover approved diagnostic system must be connected during the Pre-Delivery Inspection (PDI).