Automatic Climate Control, ACC

B2406








Stepping motor, air distribution. Flap jammed. Note: Can be set if not calibrated

Fault symptoms
Perceived temperature in cabin too high or too low compared to the set temperature.

The air distribution does not correspond with the illuminated symbol in the ACC window.

Conditions
The following conditions apply:
- When the stepping motor is running in the area 10-90% of the flap's working range (which is 0-100%) and the power consumption exceeds a certain value, the control module will detect this and set the diagnostic trouble code for jammed flap.
- The diagnostic trouble code can be set if the control module has not been calibrated.
- Continuous monitoring and when calibrating.





Diagnostic procedure

1. Mechanical check of motor
- Remove component: Motor, air distribution - defroster/panel/floor.





- Operate the calibration function to run the stepping motor.





- The motor should move when activated.

Is the function correct?
YES
- Go to step 2.
NO
- Replace Motor, air distribution - defroster/panel/floor.
- Go to step 3.





2. Checking for mechanical interference
- Make sure the flap is not sticking or have loose or damaged part.





- Restore the car to normal and calibrate.





- Delete diagnostic trouble codes in all systems.





- Carry out a function check.
- Evaluate the function check.
- Check that the diagnostic trouble code does not recur.

Does the diagnostic trouble code recur?
YES
- See "Before changing a control module." Before Changing a Control Module

NO
- The steps taken to rectify the fault were correct.





3. Final check
- Delete diagnostic trouble codes in all systems.





- Carry out a function check.
- Evaluate the function check.
- Check that the diagnostic trouble code does not recur.

Does the diagnostic trouble code recur?
YES
- See "Before changing a control module." Before Changing a Control Module

NO
- The steps taken to rectify the fault were correct.