312000890 - E2020 DIRECTION INDICATORS/HAZARD WARNING LIGHTS - DESCRIPTION

DESCRIPTION

The left and right direction indicators are switched on by raising or lowering the special lever on the left of the steering wheel interface; the function is active with the key in the MAR position.The hazard warning lights (right and left indicators operated simultaneously) are activated by pressing the special button in the centre of the dashboard. For safety reasons this function is always active.The vehicle is equipped with the Lane Change function: when the lever is placed in the unstable position for less than half a second (lane change), the direction indicator on the side involved flashes 3 times and then goes out automatically.

Following sharp braking that leads to a substantial drop in speed, the Body Computer activates the hazard warning lights having received the vehicle speed signal from the ABS control unit. When the deceleration value goes below a certain preset threshold, the Hazard function is automatically deactivated.

This vehicle has not been fitted with an inertia switch; instead it has a fuel cut off function, which is managed by the Air Bag control unit. After detecting an impact, the Air Bag control unit sends the FPS (Fire Prevention System) signal over the network which activates the hazard warning lights. This condition is also signalled on the instrument panel via the general failure warning light and a special message on the display.The engagement of the direction indicators/hazard warning lights is managed by the Body Computer which also controls the flashing frequency.In this way the two direction indicator warning lights in the instrument panel are also switched on; in addition, the system provides a low frequency acoustic signal in conjunction with the activation of the lights.The direction indicators/hazard warning lights check function carried out by the Body Computer checks that the lights are working properly; the following are checked:

• circuit open or bulb missing;
• short circuit to earth (bulb s.c. or wiring s.c. to earth);
• short circuit to Vbatt (wiring short circuited to Vbatt).

When one of the above situations occurs, the Body Computer makes the fault status available via the CAN network: a special general failure warning light comes on in the instrument panel and, at the same time, the information is shown in the display.The direction indicators are also used to signal that the commands sent by the remote control have been received and/or to signal a manoeuvre not carried out by the passenger compartment access control system.    See E3040 CENTRAL LOCKING