Diagnostic Trouble Codes From 01044

Diagnostic Trouble Codes from 01044

NOTE: The operating and display module, Climatronic Control Module J255 switches automatically to "Econ" mode if basic setting was not performed after installing a new operating and display module, Climatronic Control Module J255.

NOTE: If "ignition off time period signal" is not detected by the operating and display module, Climatronic Control Module J255 when the ignition is switched on (transmitted by Instrument Cluster Control Module J285 via CAN-Bus comfort system), the operating and display module, Climatronic Control Module J255 assumes a standing time of more than 4 hours and the engine temperature is taken to be the same as the ambient temperature. In heating mode, this can lead to delayed start-up of the Fresh Air Blower V2 despite the engine being warm. The Outside Air Temperature Display G106 in the instrument cluster may also display incorrect ambient temperature values.

NOTE: The installation of an A/C Humidity Sensor G260 is not scheduled at present (date of introduction not yet finalized). this malfunction is displayed if a vehicle with no A/C Humidity Sensor G260 has been installed with an operating and display module, Climatronic Control Module J255 for vehicles with A/C Humidity Sensor G260 (not provided at present, date of introduction not yet finalized).

NOTE: The A/C Compressor Regulator Valve N280 is installed in the compressor Refrigerant R134a.

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 Fresh Air Blower V2 contains the Fresh Air Blower Control Module J126 as an integral component which cannot be replaced separately.
- The status of the Fresh Air Blower is displayed in the measuring value block (display group "018"). By way of this status display, the operating and display module, Climatronic Control Module J255 is informed by the Fresh Air Blower Control Module J126 of any malfunctions at the Fresh Air Blower V2. Scan Tool Testing and Procedures
- The malfunction "Voltage supply too high/SP" may also be displayed if an unsuitable charging unit is used for charging the Battery A.

NOTE:
- This control motor is used to activate the air flow/fresh-air door.
- 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: If, for example, the engine control module does not supply any information on the current engine RPM (via the drive CAN-Bus system), the Instrument Cluster Control Module J285 cannot incorporate this information into the data for the CAN-Bus comfort system and this malfunction entry is made in the DTC memory of the operating and display module, Climatronic Control Module J255.

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

NOTE: With certain operating and display modules, Climatronic Control Module J255, the Multi-function Unit Control Module J501 was stored as malfunction location in the software instead of the Vehicle Electrical System Control Module J519.

NOTE: With certain operating and display modules, Climatronic Control Module J255, the Multi-function Steering Wheel Control Module J453 was stored as malfunction location in the software instead of the Steering Column Electronic Systems Control Module J527.

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

NOTE: Under certain circumstances, radio wave interference (e.g. amateur or police radio systems) may cause sporadic malfunction entries for the Air Quality Sensor G238. this malfunction entry can be erased if applicable as the function of the operating and display module, Climatronic Control Module J255 is not affected.

NOTE:
- If, on a vehicle with no Heated Windshield Z2, the operating and display module, Climatronic Control Module J255 is coded for a vehicle with the Heated Windshield Z2 optional extra, the malfunction "Open circuit/short to Ground (GND)" or "Short to positive" is entered (depending on software version in operating and display module, Climatronic Control Module J255).
- 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 Heated Windshield Z2 may also be "Open circuit/short to Ground (GND)".The malfunction with these operating and display modules, Climatronic Control Module J255 is the same as for the malfunction "Short to positive".

NOTE:
- New replacement operating and display modules, Climatronic Control Module J255 are supplied without VIN coding. The first time the ignition is switched on following installation, the VIN transmitted via the CAN-Bus comfort system is read into the operating and display module, Climatronic Control Module J255 (as of hardware/software version "0711") and stored (anti-theft protection).
- The VIN stored in the operating and display module, Climatronic Control Module J255 is indicated in display group 081" (Reading measuring value block). Scan Tool Testing and Procedures
- If an operating and display module, Climatronic Control Module J255 (as of hardware/software version "0711") is installed in a different vehicle (e.g. swapped over), the transmitted and stored VINs no longer coincide and the malfunction "Control module incorrect Vehicle Identification Number (VIN)" is stored in the operating and display module, Climatronic Control Module J255. Entering the PIN in the "Adaptation" function erases the VIN stored in the operating and display module, Climatronic Control Module J255.

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 malfunction "Adaptation limit exceeded" is displayed, check whether door reaches both end stops and that there is no excessive play in the operating levers (wear).