Disassembly
In our description we adhere to the most frequently installed VDO instrument cluster on the Audi-100:
Without disassembling the instrument cluster panel, you can remove the following elements from the back side:
Ambient temperature indicator: Remove the two Phillips head screws on the indicator block, then two more at the plug.
Light/radio buzzer: remove the mounting bracket from the instrument panel.
Indicators (control lamps): If you need to get to all the indicators, you need to remove the 2 TORX screws on top of the instrument cluster. Then you can fold the back cover of the housing down. The indicator bulbs in Audi are firmly soldered into their sockets and can only be purchased as a single unit. When buying a spare bulb, pay attention to the color of the socket: 1.1-watt, 1.2-watt and 2-watt bulbs are installed (with differently colored cartridges). To remove it, turn the cartridge a quarter turn to the left and pull it out.
Scale illumination: see "Indicators".
Adjustment resistor for scale illumination: loosen 2 TORX screws and fold back the housing cover down. Unscrew two hex nuts, remove the adjustment resistor.
Plug with code for on-board computer: remove.
Control unit for mini-test (auto-self-checks) on-board computer: loosen 2 TORX screws and fold back the instrument cluster housing cover downwards. Unscrew the control unit from the inside of the instrument cluster housing cover.
After disassembling the instrument cluster (to do this, remove the 8 screws from the outside on the back of the device, lift the main plate) the following elements become available.
Speedometer: carefully remove from plug connections and remove.
Watch with a regular dial (large size in the instrument panel): carefully remove from plug connections.
Tachometer: Unscrew the three screws on the back of the device.
Digital Clock: Remove the tachometer. Remove the two small slotted screws on the digital clock and pull the clock forward.
Fuel quantity indicator or temperature indicator: unscrew two hex nuts on the back side. Remove the front part of the housing from the fastening hooks.
Self-check system (mini) (coolant/Brake/Oil Pressure Indicator Block): remove the tachometer or large digital clock, loosen the two slotted screws, remove the indicator block from the connecting contacts.
Self-test system (auto): like a mini-test.
Instrument cluster printed circuit board: remove all control devices, as well as the adjustment resistor for the scale illumination. Loosen the screw connections, remove the board.
Voltage stabilizer: soldered to the printed circuit board.
The combined instrument panel (2) is removed from its mounting location (1) with the wires still connected.
This plug on the combined instrument cluster can only be removed after lifting up (arrows) this plastic bracket. On the plug next to it, you need to squeeze two plastic brackets.
Left: With the bumper (2) removed, the ambient temperature sensor (1) is visible, which provides information to the instrument panel.
Right: On the left edge of the combined instrument panel is the so-called code plug (arrow), which in cars with an on-board computer has different designations accepted in different countries.
Material republished from the website audimanual.ru