3360711 - E2020 DIRECTION INDICATORS / HAZARD WARNING LIGHTS - Description

Description

The left and right direction indicators are operated by raising or lowering the left lever on the stalk unit. the function is activated with the ignition key in the ON position.The hazard warning lights (right and left direction indicators operated simultaneously) are turned on by the pressing a button in the centre of the dashboard and both the direction indicators come on at the same time.An LED in the back of the button also comes on flashing in synchronization with the outside lights; the function is always activated.The switching on of the direction indicators / hazard warning lights is managed by the Body Computer which also controls the flashing frequency which is sent to the other connectors via the CAN serial network.In this way, the two direction indicator warning lights in the instrument panel are also lit up; in addition, as well as the flashing of the warning lights, the system also produces a low frequency auditory signal., via a relay in the Body Computer.

The correct operation of the lights is controlled by the direction indicators 'check' function: the following is controlled for each of the two circuits (right branch and left side):

• open circuit or 21 W bulb missing (right front, right rear, left front, left rear)
• short circuit to earth (bulb short circuit or wiring short circuit to earth)
• short circuit to Vbatt (wiring short circuit to Vbatt)
• 5W bulb replaced with a 21 W bulb

If one of the situations described above is detected, the Body Computer notifies the CAN of the failure state: a special 'lights failure' warning light comes on in the instrument panel and, at the same time, the information is shown on the display. There is also a signal that one of the front or rear 21 W bulbs is missing with an increase in the nominal flashing frequency of the warning lights in the instrument panel and the auditory feedback (buzzer).