Components Inside Passenger Compartment, Group 1

• Perform On Board Diagnostic (OBD) on A/C system using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.

• The request for the kick-down shut-off by the Climatronic Control Module -J255- / by the A/C Control Module -J301- kick-down switch-off, via the A/C Compressor Regulator Valve -N280- is made by the Engine Control Module (ECM). The data is exchanged via the data bus. The actual condition can be read in the Climatronic control module or in the A/C control module measured values block using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" (for the A/C system and the engine control module).

• Removing and installing vent, refer to Removal and Installation .

• Seat heater is not installed in all vehicles (optional equipment).
• Vehicles with automatically regulated A/C system: activation of seat heater is displayed in measured value block of Climatronic control module, check using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
• Vehicles with manually regulated A/C system: function and activation of seat heater check using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
• Seat heating, servicing, refer to Removal and Installation .
  NOTE:

  From MY 2009, as a running change, the Climatronic control module (or control modules for seat heating) is being installed, whereby the specified temperature is set to a lower characteristic line. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".

• Not installed on vehicles with manually regulated A/C system.
• Removing and installing, refer to LEFT VENT TEMPERATURE SENSOR .

• Side window/driver side.
• Removing and installing, refer to Removal and Installation .

• Removing and installing instrument panel vents, refer to INSTRUMENT PANEL VENT  and Removal and Installation .

• With Outside Air Temperature Display -G106-.
• The measured value from the Outside Air Temperature Sensor -G17- is evaluated by the control module inside the instrument cluster and then transmitted to the Climatronic control module or to the A/C control module. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
• The Climatronic control module calculates the current outside temperature from the outside temperature received and sends it back to the Instrument Cluster Control Module. Ambient temperature sent by Climatronic control module is displayed in the outside air temperature display. If the temperature display if faulty, check the measured values of the temperature sensor (vehicles with automatic A/C) using. Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
• Vehicles with manually regulated A/C system: the temperature that is calculated by Instrument Cluster Control Module due to the measured value of outside air temperature sensor is displayed in Outside Air Temperature Display.

• Removing and installing instrument panel vents, refer to INSTRUMENT PANEL VENT  and Removal and Installation .

• Removing and installing instrument panel vents, refer to INSTRUMENT PANEL VENT  and Removal and Installation .

Climatronic Control Module (on vehicles with automatically regulated A/C system) 

• Different versions (with a button for automatic air recirculation or a OFF  button, without or with seat heater control, with and without radio navigation system or radio with large control panel), allocation
• Removing and installing, refer to CLIMATRONIC CONTROL MODULE .
• Instrument Panel Interior Temperature Sensor -G56- is integrated in the Climatronic control module.
• Interior Temperature Sensor Fan -V42- is installed in the Climatronic control module, however it cannot be replaced individually, refer to INTERIOR TEMPERATURE SENSOR FAN .
• Also observe additional notes for Climatronic control module, refer to CLIMATRONIC CONTROL MODULE .
• Guided fault finding of the Climatronic control module is to be performed as described using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
• Buttons and display fields are illuminated by Light Emitting Diodes (LED), cannot be replaced.
  NOTE:

  • Different versions on vehicles with and without Fresh Air Intake Duct Temperature Sensor -G89- 
  • From model year 2006, the fresh air intake duct temperature sensor has been gradually discontinued, on vehicles without this temperature sensor, only the Climatronic control module with part no. as of index M is or may be installed.
  • On vehicles without fresh air intake duct temperature sensor, a Climatronic control module with part no. up to index L installed enters a DTC into the DTC memory.
  • To the end of model year 2007, the Air Flow Door Motor -V71- is being discontinued as a running change, on vehicles without the air flow door motor the air flow door (fresh air door) is actuated via a curved washer and lever of the Recirculation Door Motor -V113-, refer to RECIRCULATION DOOR MOTOR . Therefore note the correct allocation of the Climatronic control module, if the allocation or the adaptation is not OK this is detected during basic setting and stored as a malfunction, refer to CLIMATRONIC CONTROL MODULE .
  • From MY 2009, as a running change, the Climatronic control module is being installed, whereby the specified temperature is set to a lower characteristic line. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
  • From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. On vehicles with Start/Stop system, the Climatronic control module prevents the Stop function. If, for example, defrost is selected, the Stop Function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature is greater than a specified value. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
  • If the vehicle has the Start/Stop System, there is no additional coolant pump. An electric coolant pump may be present depending on the vehicle engine, which is controlled by an ECM. Refer to GENERAL INFORMATION and refer to COOLANT PUMP AND COOLANT THERMOSTAT ASSEMBLY OVERVIEW and Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
  • On vehicles with the Start/Stop System, only the Climatronic control module, part number 8P0 820 047 starting with index BK is or will be installed. Refer to the CLIMATRONIC CONTROL MODULE .

  A/C Control Module -J301- (vehicles with manually regulated A/C system) 

• Guided Fault Finding of the A/C control module is to be performed as described using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
• Different versions depending on vehicle equipment (with and without Driver Heated Seat Adjuster -E94- and Front Passenger Heated Seat Adjuster -E95-).
• Removing and installing, refer to HEATER CONTROLS .
• Function, electrical testing and activation of heated rear window, heated seats, etc. by (A/C control module), check using Vehicle Diagnosis, Testing and Information System VAS5051 in the "Guided Fault Finding" function.
  NOTE:

  • Beginning with MY 2009, as a running change, seat heating control modules are being installed, whereby the specified temperature for the seat heating is controlled by a lower characteristic line. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
  • From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. If the vehicles has a manual climate control system, then, depending on the setting on the A/C control module (for example, the heater is on) the Stop function will prevent the engine from being started again as soon as there is a request for heating. In cooling mode, the Stop function is not limited by the A/C control module. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
  • If the vehicle has the Start/Stop System, there is no additional coolant pump. An electric coolant pump may be present depending on the vehicle engine, which is controlled by an engine control module. Refer to GENERAL INFORMATION and refer to COOLANT PUMP AND COOLANT THERMOSTAT ASSEMBLY OVERVIEW and Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
  • If the vehicle has a Start/Stop System and a manual climate control system, then install A/C control module, part number 8P0 820 047, starting with index D.
  • From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. On vehicles with the Start/Stop System, seat heating is switched off whenever the Stop function is active (by the Vehicle Electrical System Control Module -J519- to protect the battery). After the engine is started again by the Start function, seat heating is switched on again. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".

• Not installed on vehicles with manually regulated A/C system.
• Installed in Climatronic control module.
• Interior Temperature Sensor Fan, removing and installing, refer to INTERIOR TEMPERATURE SENSOR FAN .

• Not installed on vehicles with manually regulated A/C system.
• Installed in the Climatronic control module, cannot be replaced individually.