The light signaling system (Fig. 1) is designed to notify drivers of other vehicles about a turn (U-turn) or braking, as well as to signal the state of vehicle assembly units that affect traffic safety
The light signaling system includes: hazard warning lights, brake lights, turn signals and indicator lamps for turning on the turn signals of the vehicle and trailer, indicator lamps for locking the center differential, the parking brake system, a drop in air pressure in the pneumatic drive circuits of the brake mechanisms, combined into control lamp blocks, as well as the corresponding switches, circuit breakers and relays.
Electrical diagram of the light signaling system: 1, 2 - left and right front lights; 3 - flasher relay for direction indicators and hazard warning lights; 4 - fuse PR119 (6 A); 5 - combined light switch; 6 - fuse 13.3722 (7.5 A); 7 - fuse PR310 (10 A); 8 - hazard warning light switch; 9,10 - right and left direction indicators; 11,12 - left and right rear lights; 13 - brake light switch; 14 - trailer electromagnetic valve switch; 15 - brake light relay; 16 - sound signal (buzzer); 17,18,19 - switches for indicators of pressure drop in the air brake actuator receivers; 20 - switch for indicator of the parking brake system; 21 - relay-interrupter of indicator of engagement of the parking brake system; 22 - switch for reversing light; 23 - reversing light; 24 - 24 V trailer socket; 25 - switch for indicator of locking of the center differential; 26, 28 - units of indicators; 27 - oil filter clogging indicator switch: I - to the instrument and starter switch: II - to the coolant temperature gauge: III - to the tachometer gauge: IV - to the speedometer gauge
The hazard warning light switch 8 ensures the simultaneous switching on of all direction indicators in intermittent mode.
In this case, the indicator lamp mounted in the switch handle lights up; the indicator lamps of the direction indicators in the indicator lamp block may not light.
The indicator lamps are switched on by the combination switch 5 when the instrument and starter switch is in the working position.
The contact-transistor relay-interrupter 3 ensures the intermittent operation of the direction indicators of the car and trailer; the operation of the indicators is indicated by lamps (separately for the car and trailer) in the block of 26 control lamps.
The brake signal in the rear lights is switched on when the car's brake systems are activated.
In this case, the contacts of the pneumatic-electric sensor 13 for switching on the brake signal are closed, the intermediate relay 15 of the brake signal is triggered, and the brake signal lamps of the rear lights are lit.
The brake signal circuits are included in the power supply circuit through an ammeter, bypassing the instrument switch and starter.
The brake signal is also switched on when the parking brake system is switched on.
In this case, the contacts of the sensor 20, installed in circuit III of the pneumatic drive of the brake mechanisms, are closed, and the control lamp lights up.
A relay-breaker 21 is installed in the power supply circuit of the control lamp for switching on the parking brake system, as a result of which the lamp lights up intermittent light.
At the same time, the circuits of the brake signal lamps of the rear lights are closed via the intermediate relay.
Functional diagram of the external light signaling and wheel lock. All KAMAZ vehicles: F4 - fuse PR01; S22 - combined light switch; S14 - hazard warning light switch; F3 - fuse box PR02; V3 – flasher switch of direction indicators PC951A; E24 – front direction indicator; X33 – trailer socket PS300A3; H3 – brake system indicator lamp unit; S1 – reversing light switch; E8 – Headlight; E30 – side direction indicator repeater; E2 – front direction indicator; K19 – trailer relay 901.3747; S17 – interwheel differential switch; X32 – trailer socket; E3 – side repeater; E7 – left rear light; E20 – right rear light; K5 – brake light relay; B1 – auxiliary sensor brake; S5 – brake light switch; S2, S3, S4 – center differential lock switch
Fig. 2. Functional diagram of external light signaling and wheel locking. Applies to all KAMAZ vehicles
Fig. 3. Functional diagram of the light and sound signaling of the brake system. Applies to all KAMAZ vehicles
