Disassembly
In our description, we adhere to the VDO instrument cluster most often installed on the Audi-100:
Without disassembling the instrument cluster panel, you can remove the following elements from the back side:
Ambient temperature indicator: Unscrew the two Phillips screws on the indicator block, then two more at the plug.
Light/radio buzzer: Remove retaining clip from instrument panel.
Indicators (pilot lamps): if you need to get to all the indicators, remove the 2 TORX screws on the top of the instrument panel. Then you can flip the back cover of the case down. Audi indicator bulbs are firmly soldered into their sockets and can only be purchased as a single unit. When buying a replacement light bulb, pay attention to the color of the cartridge: 1.1-watt, 1.2-watt and 2-watt lamps are installed (with different colored cartridges). To remove, turn the cartridge a quarter of a turn to the left and pull it out.
Scale illumination: see «Indicators».
Adjusting resistor for scale illumination: Loosen 2 TORX screws and fold down the back cover of the housing. Unscrew the two hex nuts, remove the adjusting resistor.
Plug with code for on-board computer: remove.
Control unit for mini check (auto-self-tests) on-board computer: loosen the 2 TORX screws and fold the rear cover of the instrument panel housing down. Unscrew the control unit from the inside in the cover of the instrument panel housing.
After disassembling the instrument cluster (to do this, remove 8 screws from the outside on the back of the device, lift the main plate) the following items become available.
Speedometer: Carefully remove from plug connections and remove.
Clock with regular dial (large size in the instrument panel): Remove carefully from the plug connections.
Tachometer: Remove the three screws on the back of the instrument.
Digital clock: remove the tachometer. Unscrew the two small slotted screws on the digital clock and pull the clock forward.
Fuel quantity indicator or temperature indicator: Remove two hexagon nuts on the back side. Remove the front housing from the mounting hooks.
Self-test system (mini) (coolant/brake/oil pressure indicator box): remove the tachometer or large digital clock, loosen the two slotted screws, remove the indicator block from the connecting contacts.
Self-test system (auto): as a mini-check.
Instrument panel printed circuit board: remove all control devices, as well as an adjusting resistor for illuminating the scales. Loosen the screw connections, remove the board.
Voltage stabilizer: soldered to the PCB.
Combined instrument panel (2) removed from its seat (1) with wires still connected.
This plug on the combination instrument panel can only be removed after lifting up (arrows) this plastic brace. On the plug next to it, you need to squeeze two plastic brackets.
Left: with bumper removed (2) visible sensor (1) ambient temperature, which gives information to the dashboard.
Right: The so-called code plug is located on the left edge of the combination instrument panel (arrow), which in cars with an on-board computer has different designations adopted in different countries.
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