Service of Audi A4 from 2001 to 2005 release.
1. Operation and maintenance of the car
1.1. General information
1.2. Keys, locks of doors
1.2.1. Keys
1.2.2. System of locks with the central management
1.2.3. Trunk lid
1.2.4. Remote radio control by locks
1.2.5. Security alarm system
1.2.6. The car with the security alarm system
1.2.7. Cowl
1.2.8. Cover of the filling hatch
1.2.9. The car with universal remote radio control of "HomeLink"
1.2.10. Power windows
1.2.11. Lifting and movable panel of a roof
1.3. Governing bodies, combination of devices and equipment of interior of the car
1.4. Seats and means of passive safety
1.5. Conditioning and heating
1.6. Driving and service of the car
2. Engine
3. Transmission
4. Running gear
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment


1.2.4. Remote radio control by locks

The system of radio control by locks allows to unlock and lock the car remotely.
Unlocking and locking of the car is confirmed by a blinking of all lamps of indexes of turn. Besides, when finding switches in the provision of operation, from door contacts illumination of salon joins automatically or switched off.
The transmitter with a battery is built in in the radio key handle. The intake is in interior of the car. The maximum range of action is defined by various factors. In process of discharge of a battery range of action decreases.
Compound component of a radio key is the put small beard intended for mechanical unlocking and locking of the car, and also launch of the engine.
When replacing of the lost key, and also after repair or replacement of the intake, remote radio control is subject to initialization at the specialized enterprise. Only after that its operation is possible.

At inclusion of ignition the device of remote radio control is automatically switched-off.
Imposing of the frequencies working in an identical working strip and transmitters which are near the car can make temporary negative impact on operability of the device (for example, mobile phones, television stations).

Unlocking of the car
Press about 1 sknopka And (fig. 1.19).

Fig. 1.19. Arrangement of buttons radioupravlniya locks

Locking of the car
Press about 1 sknopka In (fig. 1.19).

Opening of a luggage carrier
Press at least 1 sknopka With (fig. 1.19).
Unlocking of the car is confirmed by a double blinking of lamps of indexes of turn. Within about 60 seconds after unlocking of the car the button and, open doors or a luggage carrier as after this time the car is automatically locked. This function interferes with inadvertent and long unlocking of the car.
On cars to system of locks with the central management and additional degree of protection by single pressing of the button and there is an unlocking only of a door of the driver and a cover of the filling hatch, and by double pressing – all car.
At the correct locking of doors and a luggage carrier lamps of indexes of turn once flash.
Besides, when unlocking the car the memory device of provision of a seat and mirrors operated by a key turns on. Reproduction of the programmed provision of a seat of the driver and external mirrors is carried out automatically.
When unlocking and locking the car and finding of switches in the provision of operation from door contacts, illumination of salon joins automatically or switched off.

Use remote control only behind closed doors and a luggage carrier.
Do not press the locking button In in the car until the key is inserted into the ignition lock not to lock inadvertently the car and not to turn on at the same time the security alarm system. If it after all occurred, it is necessary to press the unlocking button.

Synchronization of a radio key is necessary if the car does not manage to be unlocked / locked a radio key.
If the car is closed, open it a mechanical key from the driver's door.
Press the unlocking button in a radio key.
Insert a key into the lock of ignition and include ignition.
Switch off ignition and take a key.
Press the button of unlocking And or the locking button In a radio key

1.2.3. Trunk lid

1.2.5. Security alarm system