E4023 Auxiliary instrument(dashboard centre) (<5/98)

Description

The module in the centre of the dashboard includes the:

• fuel gauge, with reserve warning light
• engine coolant temperature gauge, with maximum temperature warning light
• analogue clock.

The fuel level is displayed via electronic circuitry inside the module, which operates the gauge and the reserve warning light (about 7 litres) and "dampens" the signal preventing fluctuations.

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 flashes and stays on, a fault has been detected in the connection or the level gauge.

The coolant temperature gauge is controlled directly by a sensor on the engine. The maximum temperature warning light is controlled by a sensor on the engine with another signal, independent of the gauge, or by the engine control unit.

During starting, when the ignition is turned on, the maximum temperature warning light comes on for about 4 seconds as a self-test, then goes out.

The analogue clock consists of a face with hour and minute hands. It is electronic with a quartz oscillator. It is adjusted by means of a button inside the dial.

The centre instrument operates when the ignition is switched ON.

In the "night" position (side lights on), the brightness can be adjusted to three levels by an external button. ( Wiring diagram E2530 INSTRUMENT LIGHTING ).

Description of operation

The supply for the centre module E20 arrives directly from the battery. (maxifuse J/B1 of B5) to pin 2 via fuse F10 of the junction unit B1; the supply controlled by the ignition (INT) reaches pin 1 of the line protected by fuse B11. Pin 3 is earthed.

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The sender unit K35 sends two independent signals: the first is proportional to the engine coolant temperature: it reaches pin 10 of module E20 and acts on the gauge; the second signal, connected to the maximum temperature thermal contact, reaches pin 9 and causes the relevant warning light to come on.

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Sender unit K35 sends a signal proportional to the temperature of the engine coolant to pin 10 of module E20. The overheating signal reaches pin 9 from the engine control unit M10.

Pins 4 and 5 of the centre instrument E20 receive signals (positive and negative) coming from the fuel gauge N40 located in the fuel pump unit.

Wiring diagram

Components

Component location