Evaluating Display Group 010

Display Group 010, Display Fields 1 - 4 - Excessive Coolant Temperature Signal, A/C Compressor Cut-in/out, A/C Pressure Switches -F129-/-G65, Signal From Convertible Top Control Module -J256-

Display Field 1 - 4:

Note on display field 1:
Checking coolant temperature and instrument cluster

Notes on display field 2:
- When A/C clutch -N25- is switched on the output is closed (voltage greater than 5 V).
- If the voltage falls below 5 V while the A/C clutch is switched on (engine control module switches input to Ground), the A/C control head -E87- will switch A/C clutch -N25- off. Evaluating Display Group 001

Notes on display field 3:
- The function of radiator fan control unit -J293 and vehicle wiring layout will vary depending on whether vehicle is equipped with A/C pressure switch -F129 or high pressure sensor -G65-.
- When A/C pressure switch -F129- is open (high/low pressure switch between terminals 1 and 2) the compressor is switched off Evaluating Display Group 001
- If the refrigerant system pressure is less than 1.4 bar or greater than 31 bar, the Coolant Fan Control (FC) Module -J293-(on vehicles with high pressure sensor -G65-) will not send any voltage signal to -E87 and A/C clutch -N25- will be disengaged.

Notes on display zone 4:
- On Audi TT Coupe, display should always read "0".
- On Audi TT Roadster, convertible top control module -J256- sends a ground signal to -E87- (display reads "1") when the convertible top is open. If a hardtop is fitted, -J256- does not send a ground signal to -E87- (display reads "0").
- When the convertible top is opened on Audi TT Roadsters, A/C regulation is altered. Instead of using the measured value from instrument panel interior temperature sensor -G56-, the system assumes pre-programmed outlet temperature values based on the current outside temperature. -E87- receives this information via terminal 5 in connector C from convertible top control module -J256-.