E4040 Warning lights check

Description

During starting (ignition switched ON), the operation of all the instruments and warning lights is tested: all the warning lights and the LEDs are switched on for around 4 seconds to check their operation. In the case of the milometer (LCD), all the LCD segments are lit up for about 4 seconds to check that they are working.

This test function for the warning lights is managed by the electronic circuits inside the speedometer module which controls the test for the speedometer circuits and sends signals to the rev counter and to the auxiliary instrument and the check module.

Description of operation

The supply controlled by the ignition (INT) for the speedometer module E10 reaches pin 10 of connector A from the line protected by fuse B11 up to 2/99 or fuse F4 of the additional fuse box B98B from 2/99.

Pin 1 of connector A is earthed.

The "warning lights test" signal is sent:

• to the auxiliary instrument E20 (pin 6) from pin 4 of connector A;
• to the check panel E30 (pin 14) from pin 3 of connector A;
• to the rev counter E15 (pin 10 of connector B) from pin 3 of connector B.

Wiring diagram

Components

Component location