Mirrors: Description and Operation
Rear View Mirrors
COMPONENT LOCATION
NOTE: Left-Hand Drive (LHD) shown; Right-Hand Drive (RHD) similar.
OVERVIEW
The rear view mirrors comprise an interior mirror mounted to the windshield, and an exterior mirror mounted on each front door cheater.
For Japanese specification vehicles, a driver proximity mirror is installed on the LH front corner of the hood.
The types of mirrors and associated operating functions installed depend on the specification and trim level of the vehicle.
INTERIOR MIRROR
The interior rear view mirror is provided as a manual dimming or an electrically operated automatic dimming type. On certain vehicles, a cabin humidity sensor is incorporated in the electrically operated mirror casing.
Manual Dimming Mirror
The manual dimming mirror comprises a prismatic glass housed within a surrounding case that is attached with a ball joint connector to the mirror stem.
Manual dimming of the mirror is achieved using the lever mounted on the underside of the mirror body. Operating the lever will tilt the mirror head from the 'day' position to the 'night' position.
Automatic Dimming Mirror
The automatic dimming mirror comprises an electro-chromatic glass housed within a surrounding case that is attached with a ball joint connector to the mirror stem. The mirror stem incorporates an 8-pin electrical connector that is connected to the roof panel wiring harness. The wiring harness provides hardwired and a Local Interconnect Network (LIN) connection to the CJB.
Light sensors are mounted on the front and rear of the mirror surround case. The sensors control the automatic dimming feature to reduce glare from the headlights of following vehicles.
The automatic dimming function is permanently active when the ignition is in power mode 4 (Accessory) and power mode 6 (Ignition). The forward facing light sensor monitors the ambient light level at the front of the vehicle; the rearward facing light sensor monitors the light level coming from the rear of the vehicle. When light from the rear of the vehicle exceeds the ambient light level from the front of the vehicle, the automatic dimming circuit darkens the interior mirror surface.
Automatic dimming is inhibited when reverse gear is selected to provide the driver with maximum vision. On vehicles with automatic transmission, the reverse gear signal is provided by the TCM via the high speed Controller Area Network (CAN) bus to the CJB. The CJB then provides a power feed to the mirror. On vehicles with manual transmission, the reverse gear signal is provided by a transmission switch that is hardwired to the CJB.
Cabin Humidity Sensor
Depending on the vehicle specification, the automatic dimming interior mirror may also incorporate a cabin humidity sensor. The cabin humidity sensor is located in the mirror rear casing near to the windshield, and provides the ATC module with information regarding the probability of windshield misting. This information is used to vary the automatic operation of the climate control system.
EXTERIOR MIRRORS
Electrically operated and heated exterior mirrors are installed as standard. Depending on the specification and trim level of the vehicle, the following options are available:
^ Power fold (switch pack operated feature) and auto fold (remote handset operated feature)
^ Memory recall
^ Reverse gear mirror dip
^ Exterior mirror lamps.
The power fold/auto fold feature is available only when power fold mirrors are installed to the vehicle.
The auto fold and reverse gear mirror dip functions are not customer configurable, but may be enabled or disabled by the dealer using the Land Rover approved diagnostic system. The diagnostic system enables or disables either or both functions by setting the EEPROM contained within the instrument cluster.
The LH door mirror incorporates an ambient air temperature sensor that is hardwired to the ECM. The ECM is connected to the CJB and other control modules via the high speed CAN bus. The sensor provides information to the ECM that is then transmitted on the medium speed CAN bus for use by other control modules. On vehicles installed with a high-line instrument cluster, the CJB transmits the temperature signal to the instrument cluster that provides a display of the ambient temperature to the driver.
The exterior mirror lamps are controlled by the interior lighting function.
Exterior Mirror Adjustment
The door mirrors are controlled using a switch pack located on the driver's door. The switch pack contains 2 non-latching mirror select switches labeled 'L' and 'R' and a 4-way directional joystick. The switch pack is connected to the driver door control module via the LIN bus. The driver and front passenger door control modules are connected via the medium speed CAN bus. A hardwired connection between each door control module and the corresponding door mirror, provides the supply and ground paths for the mirror motors.
Each exterior door mirror incorporates 2 motors to control horizontal (left/right) and vertical (up/down) adjustments.
On vehicles installed with a driver's power operated memory seat and memory exterior mirrors, a potentiometer is incorporated within each mirror motor and is used to provide information regarding the actual motor positions. The current position and memory positions of each door mirror motor are maintained and stored within the corresponding door control module.
The memory exterior mirror positions are also monitored and stored within door control module memory when the reverse gear mirror dip function is used.
When reverse gear is selected, the door control modules store the current mirror positions and will then dip both the driver and passenger mirror glass to a default dip position. While reverse gear is selected it is possible to store a preferred dipped mirror position by adjusting the driver/passenger mirror glass to the desired position via the mirror switch pack. When the desired position is achieved using the switches, the new dip positions will be automatically stored by the door control modules when reverse gear is de-selected. Therefore when reverse gear is re-selected, the dip position recalled by the door control modules will be the new reverse gear mirror dip stored position. When reverse gear is deselected the mirror glass will automatically move to the previous stored position prior to reverse gear selection.
Reverse gear mirror dip is only available when memory mirrors are installed, and reverse gear mirror dip is enabled within the instrument cluster.
If the driver selects a memory recall function using the memory seat switch pack, the driver's memory seat and exterior memory mirrors are moved to a stored memory position.
Mirror Power Fold and Auto Fold Feature
Exterior mirrors with the power fold/auto fold feature incorporate a motor located in the hinge of each exterior mirror arm. Operation of the power fold feature is achieved using the exterior mirror switch pack. Operation of the auto fold feature is achieved using the remote handset.
The power fold function is active when the ignition is in power mode 6 (Ignition).
Both exterior mirrors will power fold when the mirror switch pack 'L' and 'R' switches are pressed together. Pressing the switches again will unfold the mirrors.
When the instrument cluster is configured for the auto fold feature, the mirrors will fold in when the remote handset lock button is pressed. The mirrors will unfold when the vehicle is unlocked using the remote handset unlock button.
NOTE: If the mirrors are folded in using the mirror switch pack (power fold) and the vehicle is then locked, subsequent unlocking of the vehicle will not unfold the mirrors.
When the remote handset unlock button is operated, the CJB recognizes the remote handset for that vehicle and acknowledges the request. The door control modules are connected directly to the AJB for power supply to the exterior mirror folding motors.
When the vehicle is locked the door control modules reverse the polarity of the mirror fold motor, power and ground connections to operate the mirrors in the opposite direction.
Exterior Mirror Heating
Exterior mirror heating is provided with heater elements bonded to the back of the mirror glass. Power supply for the mirror heating elements is provided by the corresponding driver or passenger door control module via the AJB.
The door control modules receive a power supply from the AJB, and are both connected on the medium speed CAN bus to the ATC module. A ground terminal from each door control module completes the circuit. The ATC module automatically controls the mirror heating function whenever the ignition is in power mode 4 (Accessory) and power mode 6 (Ignition).
DRIVER PROXIMITY MIRROR (JAPANESE SPECIFICATION ONLY)
The proximity mirror allows the driver to view the 'blind spots' below the level of the hood when performing low speed maneuvering. The mirror is manufactured in plastic and comprises a lens housing attached to a pivot arm that is attached to the LH front corner of the hood. Two lenses in the housing provide coverage across the front and along the LH side of the vehicle. The mirror is manually adjusted in the horizontal plane only.
CONTROL DIAGRAM
NOTE: A = Hardwired; D = High speed CAN bus; N = Medium speed CAN bus; O = LIN bus.
