Electrical equipment and devices of car Volkswagen Polo 4

Electrical equipment system. General information
Safety note: High voltage is generated in the vehicle, for example in the ignition system and when using xenon lamps. Therefore, persons with a pacemaker should not perform any...

Installation of additional components of the electrical equipment system
Wires that need to be laid when installing additional components in addition to the wires installed in the vehicle as standard should, if possible, always be laid along the...

Troubleshooting electrical equipment
When troubleshooting an electrical system, a systematic approach is important. This applies to both checking for failed light bulbs and checking for inoperative electric motors....

Checking the serviceability of an electrical switch
Most electrical consumers are switched on and off manually via a switch. There are also switches that operate automatically. Such switches include, for example, oil level and...

Checking the relay
Many electrical circuits have a built-in relay. The switching relay works as a switch. When the consumer of electricity is switched on manually through the switch, the relay...

Checking the rear window heating
When the rear window heating is switched on, the glass field with visible conductors should be free of fogging or ice after a while. If there is a malfunction, first check the...

Disconnecting electrical plug connectors
"A": To disconnect the plug connector, press the "arrow" plate with a screwdriver and pull the plug. When connecting the connector, the plug should lock with an audible click....

Checking the brake light
Checking the bulbs and fuse Check and replace brake light bulbs if necessary. If the brake light bulbs are OK, check the brake light switch. When you press the brake pedal, the...

Removal and installation the POLO on-board electrical system control unit
Note: The on-board electrical system control unit is located in the instrument panel above the driver's footwell. Removal Disconnect the ground (-) cable from the battery....

Removal and installation the horn
Note: The horn is located in the bumper, behind the left air grille. Removal Disconnect the ground (-) cable from the battery. Attention: Follow the instructions given in the...

Removal and installation batteries in a key with a remote radio control
Caution: When removing the batteries, check whether the batteries are embossed with polarity markings, otherwise the mounting position of the batteries must be marked. Folding...

Removal and installation batteries/bulbs in a key with backlight
Attention: When installing batteries, observe the correct polarity. Polarity markings are located on the batteries and on the case. Insert a coin into the slot on the side of the...

Replacing fuses
To prevent damage to wires and electrical system current consumers due to short circuits and overloads, individual electrical circuits are protected by fuses. Before replacing a...

Removal and installation the POLO fuse holder
Removal Press the left side dashboard cover . Take off lower shelf under the dashboard from the driver's side. Unscrew the 2 "arrow" screws, detach the fuse holder "1" from the...

Removal and installation the battery/battery holder
The battery is located in the engine compartment at the front under the fuse holder. Before removing the battery, you must first remove the fuse holder and set it aside. Caution:...

Cleaning the battery terminals
Check the battery terminals for corrosion. Corrosion on the terminals appears as white or yellowish powdery deposits. Remove the battery, see the relevant chapter above . To...

Checking the battery
Before winter sets in, the battery needs to be checked. In extreme cold, when starting the engine, the voltage of a moderately charged battery drops sharply. Maintenance-free...

Spontaneous discharge of the battery
Depending on the vehicle version, the natural spontaneous discharge of the battery is supplemented by the discharge caused by the current consumption of various control devices...

Charging the battery
Safety instructions: Do not disconnect the battery while the engine is running. Never short-circuit a battery, meaning that the positive (+) and negative (-) terminals are not...

Storage of the battery
If the car is not used for two months, the battery must be removed and stored in a charged state. The most favorable storage temperature is 0... +27°C. At this temperature, the...

Diagnosis of battery faults
*) These points apply to normal battery only.

Removal and installation the generator/checking the generator charging voltage
The car is equipped with an alternator. Depending on the model and version, generators of different power can be installed. Caution: Before installing additional electrical...

Removal and installation the voltage regulator/replacing the voltage regulator brushes
Removal Remove the generator, see previous chapter . Note: depending on the model, it is also possible to remove the voltage regulator with the generator installed. Generator 1:...

Generator fault diagnostics

Removal and installation the starter
An electric motor called a starter is used to start an internal combustion engine. In order for the car engine to start, the starter must spin the engine crankshaft to a frequency...

Checking the starter traction relay
Starter/traction relay wiring diagram If the traction relay "1" is defective, the starter gear "2" does not extend to the flywheel ring gear and the starter cannot turn the engine...

Starter fault diagnostics

Removal and installation the instrument panel
POLO Removal With the ignition off, disconnect the ground (-) cable from the battery. Attention: Follow the instructions given in the chapter " Removal and installation the...

Removal and installation steering column switches
The steering column switches combine the following switches: low beam, high beam, windshield wiper system. Removal With the ignition off, disconnect the ground (-) cable from the...

Removal and installation light switches
Removal With the ignition off, disconnect the ground (-) cable from the battery. Attention: Follow the instructions given in the chapter " Removal and installation the battery "....

POLO: headlight beam angle adjuster
Removal With the ignition off, disconnect the ground (-) cable from the battery. Attention: Follow the instructions given in the chapter " Removal and installation the battery "....

Radio/heating control unit switches on console
POLO Removal With the ignition off, disconnect the ground (-) cable from the battery. Attention: Follow the instructions given in the chapter " Removal and installation the...

Driver's door window switches
Removal With the ignition off, disconnect the ground (-) cable from the battery. Attention: Follow the instructions given in the chapter " Removal and installation the battery "....

Switch in the passenger door next to the driver/in the rear door
IBIZA Removal With the ignition off, disconnect the ground (-) cable from the battery. Attention: Follow the instructions given in the chapter " Removal and installation the...

Driver's door mirror electric switch
Removal With the ignition off, disconnect the ground (-) cable from the battery. Attention: Follow the instructions given in the chapter " Removal and installation the battery "....

Removal and installation of POLO radio
Cars are serially equipped with radio receivers with anti-theft coding. Anti-theft coding prevents unauthorized connection of the device in the event of a power failure. A power...

Removal and installation speakers
Low frequency loudspeaker/POLO Removal Remove the door trim . Disconnect the speaker plug. Using a suitable drill, drill out the 4 rivets and remove the defective speaker. Remove...

Removal and installation the antenna on the roof of the POLO
Note: For radio reception, an antenna with an electronic amplifier is installed on the roof of the car as standard. The antenna amplifier is located at the base of the antenna. 1...

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