Air conditioner operating and display unit -J255 Measured value block 001 Display zone 1 Measured control current for air conditioning system compressor regulating valve -N280 (in Amperes) J Readout 0.05 A - Compressor off. J Readout 0.30 A to 0.65 A - Compressor in loop control mode Display zone 2 Duty factor for operation of compressor regulating valve -N280 (in %) J Readout 0 percent - Compressor off. J Readout 30....40 percent to 100 percent - Compressor in loop control mode Display zone 3 Duty factor for pressure signal from high-pressure sender -G65 (in percent) J Readout 0 percent to 5 percent - Open circuit in wiring/voltage supply or earth connection - High-pressure sender -G65 defective J Readout 5 percent to 12 percent - Pressure in refrigerant circuit too low (system empty) - High-pressure sender -G65 defective J Readout 12 percent to 87.5 percent - Pressure in refrigerant circuit within permissible range J Readout above 87.5...90 percent - Pressure in refrigerant circuit too high - Activation of radiator fan not OK - High-pressure sender -G65 defective - Radiator and/or condenser dirt-clogged - Fault in refrigerant circuit J Readout 90....100 percent - Short - Open circuit in voltage supply or earth connection - High-pressure sender -G65 defective Display zone 4 Pressure in refrigerant circuit (in bar absolute pressure) J Readout below 2.6 bar - Pressure in refrigerant circuit too low (system empty) - High-pressure sender -G65 defective J Readout 2.6 bar to 29 bar - Pressure in refrigerant circuit within permissible range J Readout above 29 bar (even for a short time) - Pressure in refrigerant circuit too high - Activation of radiator fan not OK - High-pressure sender -G65 defective - Radiator and/or condenser dirt-clogged - Fault in refrigerant circuit Measured value block 002 Display zone 1 Current valid compressor shut-off condition Display zone 2 Last compressor shut-off condition Display zone 3 Last-but-one compressor shut-off condition Display zone 4 Last-but-two compressor shut-off condition Breakdown of compressor shut-off conditions: - 0 Compressor on (no shut-off condition detected) - 1 Compressor off (pressure in refrigerant circuit was or is too high) - 2 Compressor off (basic setting not performed) - 3 Compressor off (pressure in refrigerant circuit is too low) - 4 Compressor off (engine has been running for less than 5 sec.) - 5 Compressor off (engine speed is below 300 rpm) - 6 Compressor off (compressor switched off by ECON12 Compressor off (because of a request from the engine control unit) - 13 Compressor off (because of a faulty signal from high-pressure sender G65) - 14 Compressor off (because of a fault in the data bus system) - 15 Compressor off (the pressure in the refrigerant circuit in this driving period was at least 30 times too high) - 16 Compressor off (the measured temperature downstream of the evaporator has for over a minute been below 0?C) - 17 Compressor off (the measured temperature downstream of the evaporator is below -5?C) - 18 Compressor off (there is no valid measured value for the ambient temperature, e.g.: both sensors defective) - 19 Compressor off (the engine is not running and the -J255 is in auxiliary heating mode) - 20 Compressor off (no readout currently planned) - 21 Compressor off (the automatic air recirculation function is set, the measured ambient temperature is between -8?C and 5?C, there is no request for air recirculation - 22 Compressor off (the measured ambient temperature is between -8?C and 5?C, there is a request for air recirculation but the measured temperature in the passenger compartment is below 8?C) - 23 Compressor off (a fault in the radiator fans activation) Measured value block 003 Display zone 1 Actual feedback value of recirculated air flap control motor potentiometer -G143 (in recirculated air flap control motor -V113) Display zone 2 Specified feedback value for recirculated air flap control motor potentiometer -G143 (calculated by operating and display unit -J255) J Display range 55...205 Display zone 3 Value of the recirculated air flap control motor potentiometer -G143 with control motor set to lower stop determined during basic setting and stored in the operating and display unit -J255 (air recirculation flap closed, fresh air mode) J Readout above 55 and below 95 Display zone 4 Value of the recirculated air flap control motor potentiometer -G143 with control motor set to upper stop determined during basic setting and stored in the operating and display unit -J255 (air recirculation flap open) J Readout above 165 and below 205 Measured value block 004 Display zone 1 Actual feedback value of air flow flap control motor potentiometer -G113 (in air flow flap control motor -V71) Display zone 2 Specified feedback value for air flow flap control motor potentiometer -G113 (calculated by operating and display unit -J255) J Display range 60...200 Display zone 3 Value of the air flow flap control motor potentiometer -G113 with control motor set to lower stop determined during basic setting and stored in the operating and display unit -J255 (air flow/fresh air flaps closed, recirculated air mode) J Readout above 60 and below 100 Display zone 4 Value of the air flow flap control motor potentiometer -G113 with control motor set to upper stop determined during basic setting and stored in the operating and display unit -J255 (air flow/fresh air flaps open) J Readout above 160 and below 200 Measured value block 005 Display zone 1 Actual feedback value of defroster flap control motor potentiometer -G135 (in defroster flap control motor -V107) Display zone 2 Specified feedback value for defroster flap control motor potentiometer -G135 (calculated by operating and display unit -J255) J Display range 70...195 Display zone 3 Value of the defroster flap control motor potentiometer -G135 with control motor set to lower stop determined during basic setting and stored in the operating and display unit -J255 (defroster flap closed) J Readout above 70 and below 110 Display zone 4 Value of the defroster flap control motor potentiometer -G135 with control motor set to upper stop determined during basic setting and stored in the operating and display unit -J255 (defroster flap open) J Readout above 155 and below 195 Measured value block 006 Display zone 1 Actual feedback value of front left defroster/chest vent shut-off flap control motor potentiometer -G318 (in front left defroster/chest vent shut-off flap control motor -V200) Display zone 2 Specified feedback value for front left defroster/chest vent shut-off flap control motor potentiometer -G318 (calculated by operating and display unit -J255) J Display range 10...250 Display zone 3 Value of the front left defroster/chest vent shut-off flap control motor potentiometer -G318 with control motor set to lower stop determined during basic setting and stored in the operating and display unit -J255 (flap closed) J Readout above 10 and below 50 Display zone 4 Value of the front left defroster/chest vent shut-off flap control motor potentiometer -G318 with control motor set to upper stop determined during basic setting and stored in the operating and display unit -J255 (flap open) J Readout above 210 and below 250 Measured value block 007 Display zone 1 Actual feedback value of front right defroster/chest vent shut-off flap control motor potentiometer -G317 (in front right defroster/chest vent shut-off flap control motor -V199) Display zone 2 Specified feedback value for front right defroster/chest vent shut-off flap control motor potentiometer -G317 (calculated by operating and display unit -J255) J Display range 5...250 Display zone 3 Value of the front right defroster/chest vent shut-off flap control motor potentiometer -G317 with control motor set to lower stop determined during basic setting and stored in the operating and display unit -J255 (flap closed) J Readout above 5 and below 45 Display zone 4 Value of the front right defroster/chest vent shut-off flap control motor potentiometer -G317 with control motor set to upper stop determined during basic setting and stored in the operating and display unit -J255 (flap open) J Readout above 200 and below 250 Measured value block 008 Display zone 1 Actual feedback value of left footwell flap control motor potentiometer -G139 (in left footwell flap control motor -V108) Display zone 2 Specified feedback value for left footwell flap control motor potentiometer -G139 (calculated by operating and display unit -J255) J Display range 5 ... 250 Display zone 3 Value of the left footwell flap control motor potentiometer -G139 with control motor set to lower stop determined during basic setting and stored in the operating and display unit -J255 (flap closed) J Readout above 5 and below 50 Display zone 4 Value of the left footwell flap control motor potentiometer -G139 with control motor set to upper stop determined during basic setting and stored in the operating and display unit -J255 (flap open) J Readout above 210 and below 250 Measured value block 009 Display zone 1 Actual feedback value of right footwell flap control motor potentiometer -G140 (in right footwell flap control motor -V109) Display zone 2 Specified feedback value for right footwell flap control motor p...
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