Instrument Cluster / Carrier: Description and Operation

Instrument Cluster

OVERVIEW
A new instrument cluster is introduced where in addition to the larger speedometer and tachometer gauges the cluster also incorporates a Thin Film Transistor (TFT) 5" high-definition display unit.

Instrument cluster overview









The TFT display incorporates a 'Message Center' that communicates vehicle information and status data to the driver. Menus displayed in the message center allow access to a number of vehicle functions through the guidance of the message center menus. The driver operates the message center using the 'menu control' located on the right-hand-side of the steering wheel. Refer to the 'Information and Message Center' section for further information.
The instrument cluster features a number of warning indicators, where in addition to those located within the speedometer and tachometer gauges, another six indicators are positioned within the TFT unit above the message center.

DESCRIPTION

Warning Indicators - ROW Diesel Shown









Warning Indicators - NAS Gasoline Shown









Stepper motors are used to actuate the mechanical speedometer and tachometer gauges to provide a smooth and progressive response.
The warning indicators above the message center are functioned using Thin Film Transistor (TFT) technology. LEDs are used to illuminate the warning indicators in the speedometer and tachometer gauges and provide backlight illumination of the instrument cluster.
A single ambient light sensor is used to measure cabin lighting and adjust the backlight brightness of the instrument cluster accordingly. The instrument cluster also incorporates an anti-glare coating.
When the vehicle is locked the TFT unit goes off. When the vehicle is unlocked, a welcome screen is displayed featuring a Land Rover logo and an image of the vehicle, together with the current date and odometer information.
The coolant temperature and fuel quantity gauges are the default display when the stop/start button is pressed. These can be overwritten by different permutations of screens which are available to cover numerous vehicle functions through a menu selection. Refer to the 'Information and Message Center' section for further information.

Thin Film Transistor Display Unit









OPERATION

Control Diagram

NOTE:
A = Hardwired; D = High Speed CAN; N = Medium Speed CAN; O = LIN Bus;









The instrument cluster receives a permanent fused supply from the Battery Junction Box (BJB).

The cluster is connected to other vehicle systems and control modules via the:
- medium speed CAN bus,
- high speed CAN bus and
- LIN bus connections
However, some vehicle sensors are hardwired directly to the instrument cluster.
The steering lock control module is connected to a hardwired connection to the instrument cluster. Security information from other control modules is passed via the network buses and when the conditions are correct the instrument cluster instructs the steering lock control module to unlock the steering column.
The clockspring is connected to the instrument cluster on a LIN bus connection. The LIN bus passes driver selections made on the steering wheel mounted switches to the instrument cluster for processing and transmission to other control modules.