Instruments (Description): Description and operation

Description

General

The instrument packs fitted to all Freelander models are similar, with the only differences being the mph or km/h speedometer, odometer readings, tachometer maximum rev/min band and certain warning lamps.

The instrument pack is a totally electronic controlled device receiving electrical signals from sender units and CAN messages from the Engine Control Module (ECM), ABS ECU and the Electronic Automatic Transmission (EAT) ECU and transposing them via a microprocessor into analogue gauge readouts and warning lamp illumination.

The instrument pack is connected to the fascia harness by connectors C0230 and C0233 which provide all input and output connections for instrument pack operation.

A Printed Circuit Board (PCB) is located on the rear of the pack. The analogue displays, warning lamps and the LCD are integral with the PCB. No internal components are serviceable.

The instrument pack contains a non-volatile EEPROM memory which records the vehicle identification number (VIN), engine type and odometer reading. The stored odometer value cannot be changed. The EEPROM is protected by a security code to prevent unauthorised access.

A flash memory stores software and hardware identifiers which are accessible via diagnostics.

The main function of the instrument pack is to provide information to the driver of the vehicle status. The instrument pack features the following displays: l Tachometer - large analogue display l Speedometer - large analogue display l Fuel gauge - small analogue display l Engine coolant temperature gauge - small analogue display l Odometer, trip meter - Liquid Crystal Display (LCD) l Gearbox status (KV6 and Td4 JATCO automatic models only) - LCD.

The instrument pack also features a number of warning lamps. The warning lamps illuminate in one of four colours which indicate the level of importance of the warning as follows: l Red = Warning l Amber = Caution l Green = System operative l Blue = Headlamp main beam operative.

The warning lamps are located in various positions around the periphery of the analogue gauges in the instrument pack display and in the lower half of the tachometer. The direction indicators and main beam warning lamps are located at the top of the display.