External lighting devices include: headlights, front, rear and side marker lights, license plate lights, ground light (door steps), rear fog lights, rear reflectors
The headlights have halogen double-filament lamps AKG12-60+55. 60 W thread - high beam, 55 W thread - low beam.
The headlights are turned on by the central light switch in the third position.
Attention! When installing a halogen lamp in a headlight, do not touch the bulb with your fingers to avoid reducing the luminous flux or destroying the bulb during operation.
The headlights are adjusted with the engine not running at a special station equipped with a working platform, a flat screen with a matte finish, a light meter with a photodetector and a device that orients the relative position of the bus and the screen.
Two adjustment screws are located behind the headlight rim on the right and left. Adjustment in the vertical plane is made by simultaneously rotating both screws in the same direction, and horizontal adjustment is made by rotating the screws in opposite directions.
To adjust the headlights:
Install the bus in running order (with normal tire pressure) at a distance of 5 meters from the screen on which the markings are made in accordance with the figure.
Remove the headlight rims by unscrewing the screw that secures them.
Turn on the low beam and, closing one of the headlights, adjust the other with the adjusting screws so that the cut-off boundary of the low beam beam is located as shown in the figure.
Then, the second headlight should be adjusted in the same way.
For adjusted headlights, the upper boundary of the light spots should align with the line X-X (see Fig. 1), and the intersection points of the horizontal and inclined sections of the cut-off line should align with the lines G-G and D-D.
License plate lights (AC 12-5 lamps) are switched on by the central light switch.
The ground light (lamp A 12-21-3), installed under the casing covering the passenger door opening mechanism.
They turn on when the central light switch and the limit switch included in the door drive mechanism are on.
Rear fog lights (lamp A 12-21-3), are turned on by a switch on the instrument panel when the low beam headlights are on.
The control lamp built into the switch signals that they are turned on.
When switching to the “High beam” or “Parking lights on” modes, the rear fog lights go out.
Fog lights should only be used when driving in fog or other conditions of poor visibility.
Connecting fog lights parallel to brake lights is prohibited.
Interior lighting devices include interior lamps (lamp A 12-21-3), driver's lamp (lamp A 12-10), instrument panel lighting lamps AMN 12-3
Maintenance of the lighting system consists of checking its serviceability during daily technical inspection and performing the work specified in the list of maintenance work.
External signaling includes direction and hazard indicators, side repeaters, side lights, brake and reverse lights, and electric horns.
Direction and hazard indicators
The bus is equipped with an electronic switch for direction indicators and hazard warning lights, which also provides control over the serviceability of the signal lamps.
If, when turning on the turn indicators, the turn signal lamp flashes at double frequency, this indicates a malfunction of the lamp of one of the turn indicators on the right or left side of the bus (lack of contact or burnout).
If, when turning on the direction indicators, there is a one-time light signal from the indicator lights, then this is a consequence of a short to ground of the contacts of the flashlight or the supply wiring.
If the turn signal lamp does not light up, but the turn signal lamps are working properly, then you need to check the serviceability of the signal lamp.
If, when the turn signal lights are turned on, their lamps and the indicator lamp do not light up, this means that the turn signal fuse or breaker (or its circuit) is faulty.
The emergency flashing system simultaneously turns on all direction indicators in flashing mode, warning vehicles in front and behind about a bus malfunction in order to avoid an emergency situation.
The alarm system consists of an emergency signal switch alarm, relay-interrupter of direction indicators and direction indicator lights.
The switch is installed on the instrument panel. Switching on is done by pressing the switch button.
At the same time, the control lamp in the button lights up, confirming the activation of the emergency flashing alarm system
The brake signal is activated by two pneumatic switches installed on the brake valve in the sections of the front and rear circuits of the working brake system. The brake lights have A12-21-3 lamps.
The switches are connected in parallel to ensure that the brake lights continue to operate in the event of a malfunction of one of the brake system circuits or one of the switches.
The electric horn consists of a single high or low tone signal with an electromagnetic diaphragm drive system.
The signal is turned on by a button on the steering wheel, through an auxiliary signal relay. To amplify and direct the sound, the signal has a horn (resonator).
The signal relay is used to relieve the button contacts from the large current consumed by the signal.
When you press the button, the auxiliary relay circuit is closed, and the relay contacts include operating current in the signal circuit.
Maintenance of the electrical signal consists of checking its functionality during daily technical inspection.
Possible malfunctions of sound signals and ways to eliminate them
When you press the button, the signal does not sound
- Broken wire going to the button
Open the button, strip the wire from insulation, put on the tip and solder
- Broken wire in the steering column
Replace wire
- Unsoldering the signal coil leads from the breaker plate or output terminals
Solder the leads
- Burning of signal relay contacts
Clear contacts
The signal sounds weak or does not sound when the engine is not running and sounds when the engine is running
- Battery is low
Charge the battery
The signal has a rattling sound
- The signal fastening, the fastening of the cover or the signal coil is loose
Tighten the fastening
The turn signal lights include two front turn signal lights (right and left), two rear turn signal lights (right and left), two side turn signal lights, a turn signal switch and headlights located on the steering column.
The neutral position of the switch lever is ensured by the automatic release of the switch cams by a special release washer when the steering wheel is turned.
When you turn the turn switch to the right or left position, the lamps of the lights on the right or left side of the bus turn on in a flashing mode, respectively.
Working in flashing mode is carried out using a turn relay.
Simultaneously with the turning on of the direction indicator lights, the “Turn” indicator lamp on the instrument panel turns on.
The internal alarm system consists of control lamps on the instrument panel and a noise alarm (buzzer). The buzzer is installed under the instrument panel and is designed to give a signal from the passenger compartment to the driver about the need to stop.
The emergency switch is designed to prevent fire as a result of a traffic accident.
The emergency switch performs the following functions:
- – disconnection of batteries using a remote switch via relay contacts;
- – switching on all direction indicators in flashing mode through relay contacts and relay breaker;
- – disconnecting the generator excitation winding through relay contacts.
Emergency shutdown is performed by a switch installed on the instrument panel.
The emergency switch can have three key positions:
- - I - switched off, while the button is not pressed and is fixed with a locking flag (movement mode);
- - II - mode of turning off the “+ battery” and turning on the alarm; to do this, turn the locking flag and press the button until it is in a fixed position;
- - III - switching off the battery is done by pressing the switch key to the extreme (not fixed position). After you stop pressing the key returns to position "II".
Attention! It is prohibited to hold the emergency switch key in the extreme (not fixed) position for more than two seconds
Emergency door control system
When an emergency (emergency) opening of the passenger compartment door occurs, a buzzer is activated, which rings until the driver closes the door.
When a passenger presses the “Stop on demand” button, an intermittent ((4-5) sound pulses) buzzer signal appears and the indicator lamp lights up in a flashing mode until the bus stops and the door opens for the passenger to disembark.
When the emergency door is opened (single-door modification of the bus), a continuous buzzer signal occurs and the second door lights up warning lamp with the "Door" symbol until the emergency door closes and the latch returns to its original position.
Windshield wipers
The electric windshield wiper is driven by a DC electric motor.
The electric motor is turned on by a switch that provides two speeds of rotation of the electric motor armature.
The motor circuit includes a thermal bimetallic vibration fuse mounted on the wiper gear housing.
To set the windshield wiper blade to its extreme position when turning it on, there is a limit switch.
Rotation from the electric motor shaft to the brush drive shaft is transmitted through a worm gear.
For proper operation of the windshield wiper, it is necessary to prevent prolonged operation of the blades on dry glass in order to avoid overheating of the electric motor and scratches on the glass, and also to prevent gasoline or oil from getting on the rubber bands of the brushes to avoid their warping.
Blower fan
If the electric motor commutator becomes oily or burns, wipe it with a rag soaked in gasoline.
If this does not help, clean the collector with glass sandpaper. Then blow with compressed air.
Check the pressure of the brushes, which should be (2-4) N.
Fuses
All bus power consumer circuits are protected by fuses.
The bus has 5 fuse blocks: 1 block of “power” fuses BPR-5-4, located in the battery box on the right side, 3 blocks BPR13 and 1 block BPR2.02, located near the steering column.
The layout of the fuse blocks near the steering column is shown in Fig. 2.
Attention! It is prohibited to replace faulty fuses with fuses with a higher rating.
Notations used:
- "+15" – circuit after turning the ignition key to position "I";
- "+30" - circuit after turning on the remote battery switch;
- "+50" - circuit after turning the ignition key to position "II";
- "+battery" – circuit after disconnecting the remote battery switch.
Purpose of fuses
No. Circuit Fuse rating, A - Fuse purpose
1FU1
- 1FU2 +Battery 10 - Control of interior doors from the driver’s seat; Electronic speedometer
- 1FU3 +Battery 10 - Turning relay; Alarm
- 1FU4 +15 10 - Air dryer; Electronic speedometer
- 1FU5 +15 10 - Stop solenoid valve
- 1FU6 +15 10 - Generator excitation relay winding; Generating set control lamp; Instrument cluster and tachometer; ABS brakes
- 1FU7 +15 10 - Control lamps; Reversing lights; Glow plug block control
- 1FU8 +30(40) 10 - Liquid heater control
- 1FU9 +30(40) 10 - Circulation pump
- 1FU10 +30(40) 10 - Window washer; Voltage indicator
- 1FU11 +30(40) 15 - Sound signals
- 1FU12 +58 10 - Right side marker lights; Door lamps
- 1FU13 +58 10 - Left side marker lights; Instrument lighting
2FU1
- 2FU2 +30(40) 10 - Lamps for the right side of the cabin
- 2FU3 +30(40) 10 - Left windshield wiper
- 2FU4 +30(40) 15 - Right windshield wiper; Brake lights
- 2FU5 +30(40) 10 - Side window blower motor
- 2FU6 +30(60) 15 - Windshield defogger motor
- 2FU7 +30(60) 15 - Driver’s seat heater electric motor; Additional circulation pump (for PAZ-32053-07)
- 2FU8 +30(60) 15 - Left side heater electric motor No. 1; Left side heater motor No. 2
- 2FU9 +30(60) 15 - Rear fog lights; Right side heater electric motor No. 1; Right side heater motor No. 2
- 2FU10 +56 10 - Left headlight high beam
- 2FU11 +56 10 - Right headlight high beam; Indicator lamp "High beam"
- 2FU12 +56 10 - Left low beam headlight
- 2FU13 +56 10 - Right low beam headlight
3FU1
- 3FU2 +15 10 - Speed limiting device (for PAZ-32053-77)
- 3FU3 +30(40) 15 - Power supply for headlights
- 3FU4 +30(40) 15 - Lamp lamps for the left side of the cabin. Portable lamp socket. Engine compartment lamp
- 3FU5 +30(40) 10 - Forced ventilation electric motors
- 3FU6 +30(40) 10 - Driver fan motor
- 3FU7 +30(40) 10 - Fog lights
- 3FU8 +30(40) 10 - Heated rear view mirrors
- 3FU9 +30(40) 10 - Power supply for transport talking device; Power supply
- 3FU10 +30(40) 10 - Reserve
- 3FU11 +30(40) 10 - Door drive. Emergency door opening
- 3FU12 +30(40) 10 - Reserve
- 3FU13 +30(40) 10 - Reserve
Schematic diagrams for connecting lighting and light signaling devices
