Rear Fog Lamps

DESCRIPTION 

The vehicle is equipped with an extra-bright red rear fog light located at the left back side.

The rear fog light is activated via the special button in the central control unit; when the light is on, the warning light in the instrument panel comes on.

The switching on of the rear fog lamp is managed by the Body Computer; it is activated by:

• key to ON enablement signal (INT);
• a control signal coming from the switch;
• dipped beam headlight signal.

If the dipped beam headlights are turned off, the rear fog light is deactivated even if the operating button is pressed. When the lights are switched on again, the rear fog lamp does not come on automatically, but only when the button is pressed again.

If the key is switched off (OFF position) and then switched back to the KEY (ON) position M, the button must be activated again to turn on the fog lights.

The rear fog lamps check function checks that the light is working correctly: the following are checked:

• 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: a special "lights failure" warning light switches on in the instrument panel and, at the same time, the information is shown in the display.

FUNCTIONAL DESCRIPTION 

• The (ground) signal activating the rear fog lights reaches pin 45 of connector F of M001 from the control button in the central control panel H090 - pin 10.
• The activation control for the rear fog light is sent by pressing the dedicated button of the switch control unit H090.
• The switch control unit H090 is supplied at pin 2 and receives an ground signal at pin 10 from Body Computer M001 pins 12, 45 of connector F.
• 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 power supply of the rear fog light F032 from pin 45 of connector C.
• The Body Computer M001 is connected via the CAN line to the instrument panel E050 to manage the "fog lamps on" warning light and the "lights failure" warning light.