Checking control instruments and bulbs This chapter covers everything that is controlled or actuated at the push of a button: vehicle and engine status gauges and lights, switches, windscreen wipers...
Combined instrument Here we dismantled the decorative panel of the combined instrument panel (3) to expose both Phillips head mounting screws (1 and 2). Multi-pin connector (2)...
Speedometer — dismantling and checking The speedometer in the Audi A4, it couldn't be otherwise, is an electronic measuring device in the same way as the speed meter. It also processes the RPM...
Tachometer — check The tachometer shows the number of revolutions per minute of the engine crankshaft. To do this, it receives ignition pulses transmitted from the ignition/fuel...
Watches — repair If the clock does not run at all, then troubleshooting is limited to checking the appropriate fuse or lead wire. Repair, as in the case of malfunctions of...
Fuel quantity indicator On the dashboard, the fuel level is shown electrically. The deviation of the needle of the fuel quantity indicator is changed by contact with the ground. This...
Coolant temperature indicator Sensor (1) coolant temperature in a four-cylinder engine is located at the rear of the cylinder head. You will find the designation of the sensor contacts on...
Auxiliary devices As a special equipment, two additional instruments can be installed in the combined instrument panel at the bottom right and left - an oil temperature sensor...
Coolant indicator light Vehicles without autocontrol system If the coolant warning light flashes while driving, stop immediately: 1. Check coolant level (chapter Cooling system ) and,...
Control lamp of level of a brake liquid The control lamp of the brake system flashes when the ignition is switched on during the functional test; when the engine is running, it should go out. If it...
Oil pressure warning light Control lamp of level of a brake liquid The oil pressure in the Audi A4 engine is monitored by an oil pressure sensor in combination with an electronic logic...
Control lamp of indexes of turns To the right and left, next to the small round instruments at the top of the combined instrument panel, are both indicator lamps for direction indicators. They...
Control lights in round-shaped devices (and nearby) When the indicator lamps in the middle indicator field are replaced with the vehicle equipped with the control system, the indicator lamps mentioned below are...
Trailer direction indicator light It flashes rhythmically if the corresponding turn signal lamp on the trailer is on when the trailer lighting is switched on. If the turn signal light on the...
ASR control lamp On vehicles with electronic wheel slip control, this light comes on for a short time when the ignition is turned on and then goes out. The lamp flashes while...
Control lamp of the lock of ignition When the ignition is switched on, the light confirms the alignment of the data on the ignition key and the vehicle. When using someone else's key, the light is...
High beam control lamp When the ignition is on or when the light signal is on, the high beam indicator lamp receives current from the fuse «high beam» (chapter Electrical equipment )...
Airbag warning light This indicator light controls the airbag and seat belt pretensioners in the front seats. To carry out a functional check, it lights up for about 10 seconds...
ABS warning light This control lamp also lights up to check the function of the system when the ignition is switched on. If not, replace the bulb (as described). When the engine...
Parking brake warning light When the parking brake is applied, the switch closes the ground connection. Due to this, the control lamp can light up, because when the ignition is on, it is...
Battery charging control lamp When the engine is running, the charging control lamp should neither glow nor flash. Otherwise, there is a fault in the power supply, see the troubleshooting...
Vehicle auto control system Probe (2) outside temperature indicator is located on the bracket in front of the radiator (1). By special request, the so-called automatic vehicle control...
Switches — dismantling Removing the lever switch, 1st step: after loosening the two Phillips head screws (2 and 3) remove the upper trim of the steering column (1). Removing the...
Egnition lock With the steering column trim removed, both countersunk screws are visible (1 and 2), that secure the ignition switch assembly to the lock. Numeric «3» the...
Checking switches Order of execution 1. With the needle of a test lamp, you can pierce the insulation of the wire and determine which wire has voltage. 2. Locate the wiring...
Lighting signal buzzer The buzzer sounds if the light remains on with the door open and the ignition key removed. The warning sound comes from a warning buzzer, which is integrated...
Cigarette lighter The electric cigarette lighter receives direct current through the appropriate fuse. If, despite a good fuse, the cigarette lighter does not work, then the...
Heated rear window Exposed right roof pillar 1 - antenna connection; 2 - connection of rear heated glass; 3 - antenna wire to the radio receiver; 4 - control line from the radio;...
Checking windshield wipers and washers On the disassembled brush, we marked the following details with numbers 1 - metal lever mechanism; 2 - metal strip; 3 - rubber nozzle of the wiper blade. To...
Wiper motor The wiper motor, when the ignition is on, is supplied with current through the X-contact unloading relay and the fuse (chapter Electrical equipment ). In this...
Help with malfunctions Windscreen wipers Malfunction Her reasons Your help A. Windshield wipers not working 1. Defective fuse 2. Defect in the unload relay 3. Wiper drive crank...
Window washer fluid filling Constant control Exhaust fumes, oil vapor and silicone from paint care products stubbornly settle on the glass. Therefore, in the warm season, it is...
Headlight washer system Depending on the engine and equipment with headlight washer system, the Audi A4 is equipped with different reservoirs for windshield washer fluid (1). But...
Power Mirror Adjustment The power mirrors without tilt function are described below. More information about mirrors (mechanical part) you will find in the chapter Body parts . Both...
Central locking Emergency release of the fuel tank cap in the event of a central locking failure: remove the luggage compartment lining on the right, fold out the insulating...
Power windows with electric drive The operating mode of the power windows is determined not only by the switches, but also by the power window control unit on the support with additional relays...
Power sliding/removable roof If, as a result of a malfunction, the sliding roof does not work, it can be closed using the crank (arrow), which, when not in use, is clipped into the lid of...
Radio receiver — dismantling Here the radio is dismantled using two release brackets (1 and 2). The release brackets press on the mounting springs of the radio receiver and enter the...
Rear window antenna As an antenna for receiving medium waves, this type of antenna uses three metal conductive tracks at the very top of the glass. To receive VHF, the remaining...