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 system is installed on the Audi A4. This system monitors eight functions and operating states after switching on the ignition and side or brake lights. And also provides control during the movement. Thanks to this, the car's auto-control system replaces a certain number of traditional warning lights that are standard.
The fault indicator, whose light field is located in the middle of the combined instrument panel, is divided into groups «danger indication» And «warning indication».
Defects that reduce the level of safety of the car or can lead to damage are considered a danger indication and light up red in the indicator field. Additionally, the combined instrument panel's chime sounds three times. This:
Brake system:Brake fluid level is too low.
Engine oil pressure: The engine oil pressure is too low. Measuring methods as in conventional oil pressure monitoring (described above).
Coolant: The coolant temperature is above 120°C, or the operating temperature is not reached, or the coolant level is too low.
A yellow warning indication appears in the light field in combination with a one-time acoustic signal. This:
Stoplights: this symbol appears as soon as the ignition is switched on. When the brake pedal is pressed, the symbol goes out - provided that both brake lights are working.
Lighting: This check cannot be performed automatically by the control system. For control, the driver must first turn on the dipped beam headlights. At the same time, the dipped beam headlights and taillights are checked. Due to its design, the system cannot show the simultaneous failure of both incandescent lamps of dipped beam headlights or rear lights. Although this is an incredible defect.
Battery: The battery symbol will illuminate if the battery voltage is not within the nominal value of 10.6 to 15.6V.
Windshield washer system: this indication indicates that the fluid level in the washer reservoir is too low.
Fuel tank: The petrol station symbol flashes when there is 12 liters of petrol left in the fuel tank. If there are several faults in the warning display area, the symbols light up one after the other as long as the ignition is switched on.
indication «OK» should appear when, after turning on the ignition and after pressing the brake pedal, the inscription goes out «Bremslicht» – «brake lights». «OK» means that all items are checked without receiving a signal of the presence of a defect. After a short time, the light symbol disappears.
How is verification carried out?
To carry out its work, the vehicle control system first receives information about the operational state of the engine. This information comes from the ignition/injection control unit (engine speed information), from starter terminal 50 (engine running) and from terminal 61 of the generator (engine running).
The vehicle lighting control positions function completely differently. These «light bulb control devices» operate on an electromagnetic basis and compare the current flow in the wires, for example, to the right and left dipped beam headlights. If, as a result of a fault in one wire or a defect in the lamp, there is no current at all, then the control device makes a difference and sends a signal to the control unit. Of course, there is no difference even if there is a really extremely rare case when both lamps are faulty. Against this, the control device is powerless.
Tip: When connecting the socket for a trailer clutch that has been installed afterwards, it must be taken into account that the wires to the rear lights already have a lead from the lamp tester (he is in «13 place relay base» in slots 4 and 5). If the current for the socket is taken from one of the rear lights, there are different currents in the lamp monitor when the trailer lights are on and it reports «lamp defect».
Checking the car control system on its own is only partially possible: first, all sensors are checked, if a defect was not found there, then the cause of the malfunction is in the car control system itself.
Troubleshooting in the vehicle control system
1. Sensors are checked in the same way as with the control lights in a traditional dashboard.
2. The liquid level sensor, which is installed only in the vehicle control system, is checked as follows: if, despite the filled tank with washer fluid, the control light is on, then disconnect the wire connector on the water pump. If the warning light now goes out, the sensor in the water pump is faulty.
3. Checking the combined lamp tester front and rear (mounting position: «13-position relay support», slots 4 and 5) you must provide the workshop.
4. The vehicle control system is a structural element of the combined instrument panel equipped in this way. In case of a defect, it must be replaced with a new device. Another possibility: workshops can help in some cases.
Self-monitoring of the indicator module
1. With the ignition on and the vehicle at a standstill (or moving at a speed of max. 5 km/h) press the button on the bottom left of the combined instrument panel.
2. All indicator symbols are interrogated one by one, if the indicator and the system are in order.
3. Polling is not possible if there is a danger indication.
Additional functions on the indicator field of the vehicle monitoring system
Speed warning: After storing the current speed, the vehicle control system informs you by the appearance of a symbol and an audible signal if this speed is significantly exceeded. This information is stored in memory until the ignition is turned off, unless a different speed is stored in the memory or existing information is erased (keep the button on the left pressed for approx. 1 s.). It is possible to memorize two speeds.
Radio frequency indicator: if the indicator field is not occupied by information coming from the car control system, then it shows the set radio frequency if the Audi radio is equipped accordingly. Additionally, the indicator field informs about stereo reception or the supplied audio cassette (track). When there are radio stations with Radio Data System signals, the display shows «RDS».
Instructions for the driver: When the warning indicator flashes, you can receive instructions from the display on what to do at the moment. To do this, press the button at the bottom left next to the display of the vehicle control system, then a written message appears: after the signal for insufficient oil level, for example, the text «Motor abstellen, olstand prufen» – «Turn off the engine, check the oil level».
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