Diagnostic Trouble Codes Through 00975

Diagnostic Trouble Codes through 00975

NOTE: For this vehicle, the basic setting (e.g. country version, left-hand drive or right-hand drive) is coded in the Instrument Cluster Control Module J285 and transmitted via the "CAN-Bus comfort system" to the connected vehicle systems. The currently valid code is displayed in the measuring value block. The direct entry of a code in the operating and display module, Climatronic Control Module J255 is only provided for certain items of equipment (e.g. Heated Windshield Z2, vehicle model: Sedan, Avant or Cabrio and sunroof with solar cells) Scan Tool Testing and Procedures

NOTE: Reception of the information is displayed in the measuring value block (display group "125"). Scan Tool Testing and Procedures

NOTE:
- The Anti-Theft Immobilizer Control Module J334 is installed in the Instrument Cluster Control Module J285.
- The malfunction (Anti-Theft Immobilizer Control Module J334) is only detected by an operating and display module, Climatronic Control Module J255 with hardware/software as of version "0711". This function was incorporated as part of enhancement of the anti-theft protection system.
- If the ignition is switched on using a key not released for this vehicle, the operating and display module, Climatronic Control Module J255 switches automatically to "Off" mode after switching on the ignition and can only be switched to "Def" mode with the ignition switched on (no other settings possible).

NOTE:
- If the electrical system voltage (at connector "C", contact "13") drops to a value below 9.5 V, the heating of e.g. the Heated Rear Window Z1, Drivers Seat Heating Element Z6 and Front Passengers Seat Heating Element Z8 is deactivated.
- The malfunction "Signal too large" may also be displayed for example if an unsuitable charging unit is used for charging the Battery A.

NOTE:
- The DTC "Adaptation limit exceeded" is only detected during basic setting. If this malfunction occurs, a substitute value is stored as adaptation value (adaptation value for this potentiometer) and displayed in the corresponding measuring value block.
- If the DTC "Adaptation limit exceeded" is displayed, check whether door reaches both end stops and that there is no excessive play in the operating levers (wear).

NOTE:
- This control motor is used to activate the air flow/fresh-air door.
- The DTC "Adaptation limit exceeded" is only detected during basic setting. If this malfunction occurs, a substitute value is stored as adaptation value (adaptation value for this potentiometer) and displayed in the corresponding measuring value block.
- If the malfunction "Adaptation limit exceeded" is displayed, check whether the doors reach both end stops and that there is no excessive play in the operating levers (wear).

NOTE: In the case of an operating and display module, Climatronic Control Module J255 up to hardware/software version "0203", the type of malfunction "Short to Ground (GND)" or "Open circuit/short to positive" may also be displayed for this control motor. The malfunction with these operating and display modules, Climatronic Control Module J255 is the same as for the malfunction "Blocked or no voltage".

NOTE:
- The Recirculation Door Motor V113 only moves the recirculated-air door. The air flow/fresh-air doors are moved by the Air Flow Door Motor V71.
- In the case of operating and display modules, Climatronic Control Module J255 up to hardware/software version "0203", the type of malfunction "Short to Ground (GND)" or "Open circuit/short to positive" may also be displayed for this control motor. The malfunction with these operating and display modules, Climatronic Control Module J255 is the same as for the malfunction "Blocked or no voltage".

NOTE: The Instrument Panel Interior Temperature Sensor G56 is installed in the operating and display module, Climatronic Control Module J255. The Instrument Panel Interior Temperature Sensor G56 cannot be checked and replaced separately. In the event of a malfunction, the entire operating and display module, Climatronic Control Module J255 must be replaced.

NOTE:
- The Interior Temperature Sensor Fan V42 is installed in the operating and display module, Climatronic Control Module J255. The Interior Temperature Sensor Fan V42 cannot be checked and replaced separately. In the event of a malfunction, the entire operating and display module, Climatronic Control Module J255 must be replaced.
- The RPM measured by the operating and display module, Climatronic Control Module J255 for the Interior Temperature Sensor Fan V42 is displayed in the measuring value block (display group "011"). Scan Tool Testing and Procedures
- In the case of an operating and display module, Climatronic Control Module J255 up to hardware/software version "0203", the type of malfunction displayed for the Interior Temperature Sensor Fan V42 may also be "Blocked or no voltage" or "Signal outside tolerance". The malfunction with these operating and display modules, Climatronic Control Module J255 is the same as for the malfunction "RPM deviation too great".
- In the event of a malfunction at the Interior Temperature Sensor Fan V42, a temperature greater than 30 degrees C may be indicated or set on the display of the operating and display module, Climatronic Control Module J255. At the same time, the operating and display module, Climatronic Control Module J255 switches to outlet air flow control, as the temperature in the passenger compartment can no longer be measured.

NOTE:
- The Sunlight Photo Sensor G107 has two photo transistors (one each for drivers and front passengers side).
- There are different versions of the operating and display module, Climatronic Control Module J255 and the Sunlight Photo Sensor G107. Attention must therefore be paid to the exact assignment when replacing an operating and display module.
- As of VIN 400000 in Model Year 2005 (for Sedan and Avant; gradual introduction for the Cabrio in week 46/04 without prior specification of any particular VIN), vehicles are to be installed with a modified Sunlight Photo Sensor G107 and a modified operating and display module, Climatronic Control Module J255. Operating and display units, Climatronic Control Module J255 with part No. index up to "AH" are only to be installed with the Sunlight Photo Sensor G107 with part No. 8E0 907 539. Operating and display units, Climatronic Control Module J255 with part No. index "AJ" onwards are only to be installed with the Sunlight Photo Sensor G107 with part No. 8P0 907 539.
- In the event of incorrect assignment between the Sunlight Photo Sensor G107 and the operating and display module, Climatronic Control Module J255, the operating and display module, Climatronic Control Module J255 cannot evaluate the signal from the Sunlight Photo Sensor G107 and there will be problems with air conditioner control (reading measuring value block, display group "016"). Scan Tool Testing and Procedures

NOTE: If a malfunction is detected at the Evaporator Vent Temperature Sensor G263, the operating and display module, Climatronic Control Module J255 switches to emergency operation and the A/C Compressor Regulator Valve N280 is then only activated with a maximum control current of at present approx. 0.3 A to 0.5 A.This reduces the cooling output of the air conditioner and adequate cooling is no longer achieved at higher temperatures (reading measuring value block, display groups "001" and "002"). Scan Tool Testing and Procedures

NOTE:
- The duty cycle transmitted by the High Pressure Sensor G65 is displayed in the measuring value block (display group "001"). Scan Tool Testing and Procedures
- The ambient conditions under which the pressure in the refrigerant circuit was last not OK are displayed in the measuring value block (display groups "026" and "027"). Scan Tool Testing and Procedures
- The operating and display module, Climatronic Control Module J255 switches automatically to "Econ" mode if the pressure measured by the High Pressure Sensor G65 is too low or too high (the compressor must not be switched on). Scan Tool Testing and Procedures

NOTE: In the case of an operating and display module, Climatronic Control Module J255 up to hardware/software version 0203", the type of malfunction displayed for the Drivers Seat Heating Element Z6 may also be "Open circuit". The malfunction with these operating and display modules, Climatronic Control Module J255 is the same as for the malfunction "Output does not switch/short to positive".

NOTE: In the case of an operating and display module, Climatronic Control Module J255 up to hardware/software version 0203", the type of malfunction displayed for the Front Passengers Seat Heating Element Z8 may also be "Open circuit". The malfunction with these operating and display modules, Climatronic Control Module J255 is the same as for the malfunction "Output does not switch/short to positive".

NOTE:
- On vehicles up to VIN 399999 in Model Year 2005 (Sedan and Avant; gradual introduction for the Cabrio in week 46/04 without prior specification of any particular VIN), the Heated Rear Window Z1 is activated directly by the operating and display module, Climatronic Control Module J255 (the relay for switching the current is installed in the operating and display module, Climatronic Control Module J255).
- On vehicles as of VIN 400000 in Model Year 2005 (Sedan and Avant; gradual introduction for the Cabrio in week 46/04 without prior specification of any particular VIN), the Heated Rear Window Z1 will no longer be activated directly by the operating and display module, Climatronic Control Module J255 (operating and display modules, Climatronic Control Module J255 with part No. index "AJ" onwards are no longer installed with a relay). On these vehicles, the Heated Rear Window Z1 is activated via the Rear Window Defogger Relay J9.
- In the case of operating and display modules, Climatronic Control Module J255 up to hardware/software version 0203", the type of malfunction displayed for the Heated Rear Window Z1 may also be "Open circuit". The malfunction with these operating and display modules, Climatronic Control Module J255 is the same as for the malfunction "Output does not switch/short to positive".