2892455 - Introduction - INSTRUMENT PANEL
LCD
Liquid Crystal Display This consists of elements where, after the electric current passes through, the transparency is altered, composing figures or letters according to the basic electrical circuit.LED
The LED code (Light Emitting Diode) is used for particular diodes capable of emitting light at a certain wavelength when a low voltage electric current passes through.The gauges and warning lights which form the instrument panel are grouped in a single instrument containing:
- electronic speedometer
- total mileage counter/trip recorder
- digital clock
- fuel gauge, with reserve warning light
- warning lights
REAR VIEW
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Instrument pin-out
Connector APin, Signal1, direct supply2, supply controlled by the ignition3, power earth4, electronic earth5, left direction indicators warning light6, right direction indicators warning lightConnector BPin, Signal1, side lights warning light2, main beam headlamps warning light3, speedometer signal output (preparation)4, fuel gauge signal5, fuel gauge earth6, Air Bag failure warning light7, passenger Air Bag deactivation warning light8, handbrake warning light9, N.C.10, N.C11, N.C.12, N.C.Connector CPin, Signal1, generator warning light2, low oil pressure warning light3, engine overheating warning light4, heater plugs warning light5, brake pad wear warning light6, fuel injection failure warning light7, ABS failure warning light8, speedometer sensor supply9, speedometer signal input10, speedometer signal output11, speedometer signal output12, Code failure warning light13, low brake fluid level warning light14, EBD failure warning light15, diesel preheating enablement16, trailer direction indicators warning lightSpeedometer signal
The speedometer signal comes from the specific sensor located on the gearbox.The gauge display is produced by an electronic circuit inside the module. There are also some 'repeat' outputs of the signal for other systems which require this information.Milometer
The milometer consists of an LCD which alternately shows the total and trip mileage.The specific button switches between functions and resets the trip recorder:
- if the button is pressed briefly (less than about 2.5 s), it switches over between total/trip mileage
- if the button is pressed for longer (more than about 2.5 s) and the milometer is on trip recorder, the recorder is reset.
Zeroing the milometer
The total mileage counter can be reset only once - during the first 200 km - following handling during production or prior to delivery to the Customer.In the case of a new instrument, the mileage reading is preceded by an 'H' (e.g. 'H00199').After 200 km, the letter H disappears automatically and the reading becomes '000201'.If the reset button is pressed before 200 km, the letter H disappears and the counting restarts from '000000'.This operation can only be carried out once!Clock
The digital clock is electronic with quartz oscillator. It is adjusted by means of a button inside the dial.The time is adjusted using the 'h' and 'min' buttons.The clock is set to zero if the battery is disconnected for over 10 seconds.Lcd
The segments of the milometer and clock display can be tested as follows: turn the ignition on while holding down the reset button.Fuel gauge
The fuel level is displayed via electronic circuitry inside the module, which operates the gauge and the warning light (which comes on when the gauge is at about 1/8 of its travel). The internal logic 'dampens' the signal, preventing fluctuations (e.g. the warning light comes on if the signal persists for at least 100 s).During starting, when the ignition is turned on, the warning light comes on for about 4 seconds as a self-test, then goes out.If it stays on flashing, and at the same time the gauge goes to '0', this means that there is a fault in the connection (short circuit to earth or A.C.) or in the fuel gauge sender unit.Warning lights
'intelligent' warning lights
Some warning lights come on not only to indicate a fault in the system they are checking, but also if there is a failed connection or a short to earth from the circuit which connects the warning light and relevant control unit: these warning lights have a special internal control circuit which checks that they are connected correctly.These warning lights are:
- 'Air Bag failure'
- 'ABS failure'
'insufficient brake fluid level' and 'handbrake' warning light
The 'insufficient brake fluid level' and 'handbrake' warning light has a dual function:
- if it comes on, during driving, together with the 'ABS failure' warning light, it indicates a fault in the EBD braking system, managed by the ABS control unit (for further details refer to the description of the ABS)
- if, on the other hand, it comes on by itself, the brake fluid level is low or the handbrake is on.