Repair and Diagnosis: Electrical: Gauges: Instruments: Description: General

The instrument pack consists of four analogue dials, four warning lamp packs and a Liquid Crystal Display (LCD) odometer.

The four dials are used to indicate:

• Road speed.
• Engine speed.
• Fuel tank level.
• Engine coolant temperature.

The dials are driven by a microprocessor from information received from the serial communication link. Information input is received as either:

• Digital.
• Analogue.
• Pulse train.
• Pulse Width Modulation (PWM).

The LCD provides information for:

• Odometer.
• Trip distance.
• Selected gear (on vehicles fitted with an automatic gearbox).

A trip reset button is provided to zero the trip display, this button also allows the selection of "miles" or "kilometers" for the display. A photocell controls the illumination of the LCD, maintaining contrast of the display during ambient light changes.

Within the four warning lamp packs there are 28 lamps. A long life bulb illuminates the high beam warning lamp and the rest of the warning lamps are illuminated by Light Emitting Diodes (LED's). All warning lamp legends are invisible until lit. When lit the symbols are illuminated on a black background.

The warning lamps illuminate in one of four colors. The color indicates the level of importance to the driver, as follows:

• Red = warning.
• Amber = caution.
• Green = system operative.
• Blue = main beam operative.

The first warning lamp pack is located in the top left-hand side of the instrument pack and contains the following warning lamps:

• Traction control warning lamp.
• Transfer box in neutral warning lamp.
• Differential lock warning lamp
• Overspeed warning lamp (activated for gulf market only).
• Brake system warning lamp.
• Hill Descent Control (HDC) information warning lamp.
• Malfunction Indicator Lamp (MIL)/ SERVICE ENGINE SOON warning lamp.

The second warning lamp pack is located in the center of the instrument pack and contains the following warning lamps:

• Direction indicator warning lamps.
• High beam warning lamp.
• Anti-lock brake system warning lamp.

The third warning lamp pack is located in the top right-hand side of the instrument pack and contains the following warning lamps:

• SRS warning lamp.
• SLS off road mode warning lamp.
• Trailer warning lamp.
• Glow plug warning lamp.
• Water in fuel filter warning lamp.
• Seat belt warning lamp.
• Transmission high temperature warning lamp.

The fourth warning lamp pack is located underneath the tachometer of the instrument pack contains the following warning lamps:

• Oil pressure warning lamp.
• Alternator charge warning lamp.
• HDC fault warning lamp.
• Self Levelling Suspension (SLS) warning lamp.
• Active Cornering Enhancement (ACE) warning lamp.
• Gearbox manual/sport mode warning lamps.

The serial communication link is used to allow information to travel to and from the instrument pack, and it provides the ability to configure the instrument pack to a specific market. It also allows the instrument pack to be controlled by TestBook for diagnostics.

There are five market specific variants of the instrument pack:

• United Kingdom (UK).
• North American Specification (NAS).
• Canada.
• Australia.
• Rest Of the World (ROW), Gulf and Japan.

The main difference between the five markets is that the speedometer will indicate road speed in mph as major figures and km/h as minor figures, km/h as major figures and mph as minor figures or km/h only.

When TestBook is used to diagnose the instrument pack it demands each of the dials and warning lamps to operate in-turn so a visual check of their operation can be made.