2. Remove the appropriate device, component or printed circuit board, referring to Figures 12.10, 12.11 and 12.12.
3. Many devices require the use of an Audi tester to check, but the following can be performed without the use of special equipment.
4. To check the voltage stabilizer, connect the device wiring and restore the connection of the negative battery terminal.
5. Connect a voltmeter between the positive connection of the voltage regulator and ground (fig. 12.13) (photo). Turn on the ignition, the voltmeter should show approximately the battery voltage. If not, check for damage to the wiring that feeds the stabilizer.
6. Check the output voltage of the stabilizer by connecting a voltmeter between connection 3 (positive output) and 1 (ground), as shown in Fig. 12.14. With the ignition on, the voltage should be 9.75-10.25 volts. If not, replace the voltage stabilizer. Turn off the ignition after completing the check.
7. The accuracy of the fuel gauge can be checked as follows: Remove all fuel from the tank, then add exactly 12.0 liters of fuel.
8. Turn on the ignition, wait two minutes for the meter readings to stabilize. After this, the pointer should align with the upper edge of the red reserve zone. If necessary, turn the adjusting screw under the pointer to correct the readings.
9. The instrument panel is assembled in the reverse order.
(The text is based on materials from the website: audimanual)