Direction Indicators/Hazard Warning Lamps

DESCRIPTION:  The direction indicators are traditional with an incandescent bulb. The left and right direction indicators are switched on by raising or lowering the special left steering column stalk; the function is activated with the key in the KEY position. The hazard warning lights (left and right direction indicators operated simultaneously) are activated via a button on the central tunnel that activates all direction indicators at the same time. An LED at the back of the control button switches on as well. For safety reasons, this function is always active. The device also has a lane change function: when the lever is placed in an unstable position for less than half a second (lane change) the direction indicator on the side selected is activated for 5 flashes and then switches off automatically. The engagement 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 nodes via the CAN serial network. 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' check function checks that the lights are working correctly: the following are checked for each of the two circuits (right side branch and vehicle left side):

• open circuit or missing bulb
• short circuit to ground (bulb s.c. or wiring s.c. to ground)
• short circuit to battery voltage (wiring short circuited to Vbatt)

When one of the situations described above is verified, the Body Computer makes the failure status available to the CAN: in the instrument panel: a special failure warning light comes on and, at the same time, the information is shown in the display only at key on. In addition, at the same time as a failure warning light switches on, the flashing frequency of the visual indication in the display and the acoustic signal increases; the flashing frequency of the exterior lights, on the other hand, remains unchanged.

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.

FUNCTIONAL DESCRIPTION: 

• There is a single (ground) signal sent by the steering column stalk H005 to the Body Computer M001 that manages the left and right direction indicators: from pin 1 of H005 to pin 51 of connector F of M001; the signal sent is coded by means of resistive dividers so that multiple information can be sent by the steering column stalk to the Body Computer via a single connection.
• The reference ground reaches pin 10 of H005 from pin 34 of connector F of M001. The (ground) signal activating the hazard warning lights reaches pin 18 of connector B of M001 from control button H020. The Body Computer M001 - connector A - receives a direct power supply from the battery through the line protected by maxi fuse F01 of the engine compartment control unit B001.
• The Body Computer M001 receives an ignition-controlled power supply (INT) at pin 11 of connector E: this signal is used, amongst other things, to "wake up the network".
• The ground reference reaches pins 9, 10 of connector E of Body Computer M001.
• The Body Computer M001 controls the side direction indicators F020 (left) and F021 (right) from pins 11 and 9 of connector F, the front direction indicators F018 (left) and F019 (right) from pins 10 and 8 of connector F and, lastly, the rear direction indicators F030 (left) and F031 (right) from pins 1 and 3 of connector C.
• The Body Computer M001 is connected, via the CAN line, to the instrument panel E050 to manage the direction indicator warning lights, the buzzer and, if there is a problem in the circuit, the "lights failure" warning light.