When repairing the electrical equipment of a car, sometimes you have to check all the wiring
To do this, you need to imagine how it passes through the body
All wiring is mostly hidden under the skin and under the cladding panels.
On the harness diagrams you can see how it goes.
Also, these schemes can help out well when transferring electrical harnesses from body to body, when you need to change the body.
Basically, the wiring of all cars is divided into three main parts.
This is the engine wiring harness or it is also called the front harness.
The rear harness is the harness for the car interior. And the dashboard harness.
Additional harnesses include door harnesses and other harnesses.
Depending on the current strength, wires in bundles of different sections are used.
The strongest wires are on the connection of the battery to the starter and generator.
The ignition system uses special high voltage wires that can withstand voltages up to 40,000 volts.
Three harnesses are included in the front harness of the engine compartment.
Battery connecting harness with starter and generator set.
The harness for the control and monitoring system of the power plant. And a harness for lighting, alarms and windshield wipers.
The rear harness serves the signaling and lighting systems of the rear lights, interior lights, fuel module, etc.
All harnesses are connected to each other in a common circuit using connecting blocks.
Since the vehicle system is a single-wire circuit, the negative wire of the wiring harnesses is attached to the vehicle body.
As a rule, the negative wire has black insulation.
When installing or checking electrical connections, it is imperative to pay attention to connecting the ground wire.
In many cases, due to the oxidation of the contact, one or another malfunction occurs in the electrician.
The figures below show the layout of the wiring harnesses of a VAZ-2123 car.
Rear wiring harness 2123-3724210-60:
- to the electric fuel pump;
- to the right rear door harness block;
- to the left rear door harness block;
- to interior lampshade;
- to the individual lighting dome;
- to the right front door harness block;
- to the right side turn signal;
- to the right lantern;
- to the body (ground wire);
- to rear right speaker;
- to the left lamp;
- to tailgate harness block;
- to the license plate light harness block;
- to the body (ground wire);
- to the trunk light;
- to the rear left speaker;
- to the left side direction indicator;
- to the left front door harness block;
- to the door lock control unit;
- to the instrument panel harness connector;
- to the body (ground wire);
- to the ignition harness block;
- to the handbrake sensor;
- to the differential engagement sensor;
- to the vehicle speed sensor;
- to the reversing light switch;
- to the seat heating harness block;
- to the electric mirror control unit;
- to the oxygen sensor;
- to the electric heating control unit;
- to the right seat electric heater;
- to the rear harness block;
- to the left seat electric heater;
- to the rear harness block;
- to the body (ground wire);
- to license plate lights
- - Ignition harnesses 2123-3724026-80 (blue);
- - Front 2123-3724010-50 (red);
- - connecting battery and starter 2123-3724070 (green)
Ignition harness 2123-3724026-80:
- - to throttle position sensor;
- - to idle control;
- - to the coolant temperature sensor;
- - to the injector harness block;
- - to the coolant temperature gauge sensor;
- - to mass air flow sensor:
- - to the ignition module;
- - to the control la sensor oil pressure gauges;
- - to the donation sensor;
- - to the adsorber purge solenoid valve;
- - to the block of the instrument panel harness;
- - to rear wiring harness;
- - to the “plus” of the battery:
- - to "minus" battery;
- - to controller;
- - to the ignition relay and its fuse;
- - to the relay and fuse of the electric fuel pump;
- - to the relay and fuse of the right electric fan:
- - to the relay and fuse of the left electric fan;
- - to the additional relay;
- - to the oxygen sensor;
- - to the relay and fuse of the air conditioner;
- - to the body (ground wire);
- - to the wiring harness of the air conditioning compressor;
- - to knock sensor:
- - to the phase sensor;
- - to the right electric fan of the engine cooling system;
- - to the electric fan of the engine cooling system, left;
- - to the resistor;
- - to the crankshaft position sensor.
Wiring harness front 2123-3724010-50:
- - to the block of the instrument panel harness;
- - to the block of the instrument panel harness;
- - to the wiper motor;
- - to "plus" battery;
- - to the engine compartment lamp switch;
- - to the brake fluid level sensor;
- - to the washer motor;
- - to the right direction indicator;
- - to the right headlight;
- - to the body (ground wire);
- - to the block of the harness of the connecting battery and starter;
- - to the right fog lamp;
- - to the generator;
- - to the engine compartment lamp;
- - to left direction indicator;
- - to the left headlight;
- - to the body (ground wire);
- - to the left fog lamp;
- - to the sound signal;
- - to the air temperature sensor.
Wiring harness connecting battery and starter 2123-3724070 (green):
- 21 - to starter;
- 22 - to the front harness block;
- 23 - to the engine ("ground" wire);
- 24 - to battery plus;
- 25 - to the minus of the battery;
- 26 - to the body (ground wire).
Wiring harness front left door:
- - to the rear harness block;
- - to the electric drive of the rear-view mirror;
- - to the power window gearmotor;
- - to the left / right door power window control buttons;
- - to loudspeaker;
- - to the central locking gearmotor;
- - to the switch of the left front door of the interior lighting
Right front door harness 2123-3724550-20:
- - to the rear harness block;
- - to the electric drive of the rear-view mirror;
- - to the power window gearmotor;
- - to the left / right door power window control buttons;
- - to loudspeaker;
- - to the central locking gearmotor;
- - to the switch of the right front door of the interior light
Wiring harness left/right rear door 2123-372450-10:
- - to the rear harness block;
- - to the central locking gearmotor;
- - to the switch of the right front door of interior lighting
Wiring harness rear additional (tailgate) 2123-3724558:
- - to the rear harness block;
- - to the body (ground wire);
- - to washer motor4
- - to the wiper motor;
- - to the central locking gearmotor;
- - to the tailgate switch of the interior lighting dome;
- - to the glass heating element;
- - to the glass heating element;
- - to an additional stoplight
Instrument panel wiring harness 2123-3724030-90:
- - 1 - diode;
- - 2-6 - to mounting block;
- - 7 - to the body (ground wire);
- - 8 - to the horn relay;
- - 9 - to the seat heater relay;
- - 10 - to the starter relay;
- - 11 - to the fog lamp relay;
- - 12 - to the power window relay;
- - 13 - 14 - to the front wiring harness pads;
- - 15 - to the rear wiring harness block;
- - 16 - to the headlight and turn signal switch:
- - 17 - to the horn switch;
- - 18 - to the windshield wiper and washer switch;
- - 19-20 - to the ignition switch;
- - to the diagnostic block;
- - 22-23 - to the brake light switch;
- - 24 - to the potentiometer;
- - 25 - to the headlight range control;
- - 26 - to the outdoor light switch;
- - 27-28 to instrument cluster;
- - 29 - to the block of the wiring harness of the ignition system;
- - 30 - to the alarm switch;
- - 31 - to the fog light switch;
- - 32 - to the rear fog light switch;
- - 33 - to the air conditioner switch;
- - 34 - to the heated rear window switch;
- - 35 - to the block of control lamps;
- - 36 - to the backlight of the heater control panel;
- - 37-38 - to the radio device;
- - 39 - to heater motor switch;
- - 40 - to the APS control unit;
- - 41 - to the cigarette lighter;
- - 42 - to additional resistance;
- - 43 - to the heater motor;
- - 44-45 - to the glove box light;
- - 46 - to glove box light switch.
