Headlights
On cars, a headlight unit is used that combines low beam and high beam headlights (with single filament lamps) and direction indicators. In addition, one of the headlights has a position light bulb.
The scheme of inclusion of headlights is shown in fig. 7-21. The dipped and main beam headlights are switched on using auxiliary relays K4 and K5 located in the mounting block. The control voltage to the relay windings is supplied from the headlight switch 3, if the key of the outdoor lighting switch 5 is fully pressed. When the low beam is turned on, the low beam lamps are on, and when the high beam is turned on, all the lamps are on (both near and far).
Pic. 7-21. Headlight switching pattern:
1 - block headlights;
2 - mounting block;
3 - headlight switch;
4 - ignition switch;
5 - outdoor lighting switch;
6 - control lamp high beam headlights in the instrument cluster;
K4 - relay for switching on the dipped headlights;
K5 - high beam headlight relay;
A - to power supplies.
Regardless of the position of the switch button 5, you can switch on the main beam for a short time by pulling the headlight switch lever 3 towards you. In this case, the voltage to the contact «30» switch 3 is supplied directly from the power sources.
Fog lights
The scheme of inclusion of fog lamps is shown in fig. 7-22. Headlights are turned on by switch 4 using auxiliary relay 5 of type 904.3747-11 or 904.3747-11A, installed in a block attached to the rear side of the mounting block. The fog lights can only be switched on if the outdoor lighting is switched on with switch 3.
Pic. 7-22. Scheme for switching on fog lights:
1 - fog lights;
2 - mounting block;
3 - outdoor lighting switch;
4 - fog lamp switch;
5 - relay for turning on fog lights;
A - to power supplies.
Fog light
The scheme of switching on the fog light is shown in fig. 7-23. Fog lamps 3 in the rear lights are switched on by switch 4 through the APS control unit 5 only if the headlights are on (the corresponding key of the switch 2 for outdoor lighting is fully pressed). When the side lights are turned off, the rear fog lights turn off automatically.
Pic. 7-23. Scheme for switching on fog lights:
1 - ignition switch;
2 - outdoor lighting switch;
3 - fog light lamps in the rear lights;
4 - rear fog lights switch;
5 - control unit of the automobile anti-theft system.
Outdoor Lighting
The scheme for switching on external lighting is shown in fig. 7-24. The side light is switched on by the switch 6 for outdoor lighting.
Pic. 7-24. Scheme for switching on outdoor lighting:
1 - side light lamps in block headlights;
2 - engine compartment lamp;
3 - engine compartment lamp switch;
4 - mounting block;
5 - ignition switch;
6 - outdoor lighting switch;
7 - side light lamps in the rear lights;
8 - brake light lamps in the rear lights;
9 - additional braking signal;
10 - license plate lights;
11 - control lamp for turning on the outside light in the instrument cluster;
12 - stoplight switch;
K1 - lamp health monitoring relay (inside the relay, the contact jumpers are shown, which must be installed in the absence of a relay);
A - to power supplies;
B - to instrument lighting lamps.
The side light and brake light lamps are powered through relay K1 for lamp health monitoring. If the lamp health monitoring relay is not installed in the mounting block, then instead of it there should be contact jumpers, shown by arrows in fig. 7-24.
Direction indicators
The scheme of inclusion of indexes of turn and the alarm system is shown in fig. 7-25. The right or left side direction indicators are switched on by switch 3. In the alarm mode, switch 6 turns on all direction indicators. The flashing of the lamps is provided by the relay-breaker K3 in the mounting block.
Pic. 7-25. Scheme of switching on direction indicators and alarms:
1 - direction indicator lamps in headlights;
2 - ignition switch;
3 - turn signal switch;
4 - side direction indicators;
5 - turn signal lamps in the rear lights;
6 - alarm switch;
7 - instrument cluster with control lamps for direction indicators and alarms;
8 - mounting block;
K3 - relay-breaker for direction indicators and alarm;
A - to power supplies.