E4010 Instrument panel

Description

The gauges and warning lights which form the instrument panel are grouped in a single instrument containing:

• electronic speedometer
• electronic rev counter
• coolant temperature gauge, with overheating warning light
• fuel gauge, with reserve warning light
• warning lights.

Depending on the version, the instrument panel is supplied in two models:

• 'BASIC', fitted with: two LCD displays: one for the odometer, indication of the headlamp adjustmer, etc., the other for the clock, external temperature, etc.
• 'HIGH' with the second LCD display, is of the active matrix type; also contains information relating to the trip computer etc.

The instrument panel is a node on the CAN network through which it exchanges information with the Body Computer and the other electronic units.

Speedometer: the function displays the vehicle speed on the instrument panel: this information comes from the ABS control unit, via the Body Computer.

Engine rpm: the function displays the engine rpm on the instrument panel, via the message sent on the CAN network from the engine management control unit.

Odometer: this function displays and memorises the total mileage counter and trip recorder: the distance travelled information is processed by the Body Computer via a counter; the specific button located on the panel beside the steering wheel resets the trip recorder.

Fuel gauge: the Body Computer receives the signal from the sensor integrated in the pump unit in the fuel tank and processes it so as to ensure appropriate filtering / damping to the instrument panel gauge, and also controls the lighting up of the 'reserve' warning light.

Engine water temperature: the function displays the water temperature on the instrument panel and lights up the water overheating warning light by means of the messages sent via the CAN network from the engine management control unit.

Minimum engine oil pressure: the function lights up the minimum oil pressure warning light on the instrument panel via the message sent on the CAN network from the engine management control unit.

Brake pad wear: the function lights up the specific warning light: the Body Computer detects the state of the brake pad wear associated with the presence of braking (signal from the brake pedal) which is prolonged (intermittent indications are ignored).

Inertial switch state: the instrument panel receives a signal from the switch, lights up the relevant warning light and communicates the activation to the other nodes via the CAN network.

Other information is acquired directly from the instrument panel which manages the lighting up of the relevant warning lights:

• Driver's seat belt not fastened: the instrument panel receives a signal from the seat belt unfastened switch and lights up the relevant warning light.
• Handbrake on: the warning light relating to the handbrake state is controlled by the specific switch; in addition, if this signal is associated with a particular speed threshold being surpassed, an acoustic signal is activated.
• Low brake fluid: the function lights up the 'low brake fluid level' warning light on the instrument panel.

Other warning lights are located on the instrument panel, but managed directly by other electronic units:

• Air Bag failure warning light;
• passenger Air Bag disablement warning light;
• i.e. failure warning light (EOBD)

For the 'HIGH' instrument panel, the active matrix LCD display also displays some commands or messages relating to the use of the radio, telephone Wiring diagram E3570 INTEGRATED RADIO PHONE or navigator Wiring diagram E4090 NAVIGATOR coming from the integrated radio-telephone-navigator.

For more details Characteristic of working principle 5560 Instruments .

This diagram illustrates the operation of the warning lights not contained in other functions; the others are described and illustrated in the diagrams of the components to which they refer:

• side lights, lights failure (check) Wiring diagram E2010 SIDE LIGHTS / NUMBER PLATE
• main beam headlamps Wiring diagram E2012 MAIN BEAM
• direction indicators Wiring diagram E2020 TURN/ HAZARD LIGHTS
• doors open Wiring diagram E2510 ROOF LAMP
• recharging Wiring diagram E5010 IGNITION AND RECHARGING
• EOBD - injection system failure Wiring diagram E5030 PETROL ENGINES ELECTRONIC CONTROL
• minimum oil pressure Wiring diagram E5030 PETROL ENGINES ELECTRONIC CONTROL
• engine overheating Wiring diagram E5030 PETROL ENGINES ELECTRONIC CONTROL
• Cruise Control Wiring diagram E5060 CRUISE CONTROL
• CODE failure Wiring diagram E7010 CODE
• ABS - EBD failure Wiring diagram E7020 ABS
• ASR on/failure Wiring diagram E7021 ASR / TCS
• VDC on/failure Wiring diagram E7022 VDC
• Air Bag failure Wiring diagram E7030 AIRBAG
• passenger Air Bag disablement Wiring diagram E7030 AIRBAG
• selected gears display Wiring diagram E7051 ROBOTIZED GEARBOX
• gearbox failure Wiring diagram E7051 ROBOTIZED GEARBOX

Description of operation

The ignition-operated power supply (INT) of the instrument panel E50 reaches pin 1 of connector A via the line of fuse F37 of the unit under the dashboard B2; the direct supply reaches pin 2 of connector A via the line of fuse F53 of the unit under the dashboard B2; the pin 7 of connector A is earthed (earth controlled by the Body Computer M1).

The instrument panel E50 is connected from pins 3 and 4 of connector A to the Body Computer M1 and via the latter to the whole CAN network: via CAN, the electronic speedometer signal arrives (from the ABS control unit M50): this signal is replicated from pin 37 of M50 to pin 17 of connector A of the Body Computer M1.

The electronic rev counter receives the engine rpm signal coming via CAN from the engine management control unit M10.

The fuel gauge is controlled in accordance with the signals coming from the fuel gauge sender unit located in the fuel pump assembly N40 - at pins 4 and 15 of the Body Computer M1, and from here via CAN to the instrument panel E50.

The seat belt warning light is controlled by a signal sent to pin 15 of connector A of E50 from switch I45.

The inertia switch warning light is controlled in accordance with the signal which reaches pin 12 of connector A of E50 from the relevant switch I50 (N.O. contact: the N.C. contact is the one which interrupts the operation of the petrol pump Wiring diagram E5030 PETROL ENGINES ELECTRONIC CONTROL .

The brake pad wear warning light is controlled in accordance with the signal which reaches pin 23 of connector A of the Body Computer M1 from the relevant sensor K20.

The low brake fluid/handbrake applied warning light comes on through a signal from the handbrake switch I40, which reaches pin 24 of connector E of the Body Computer M1, or from the signal from the low brake fluid level sensor K25, which reaches pin 18 of connector A of M1.

All these signals are transferred via CAN to the instrument panel E50.

Wiring diagram

Components

Component location