Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fresh Air Blower Control Module J126
The Fresh Air Blower Control Module replacement part is available in different versions. Be sure to use the right one. Refer to the Electronic Parts Information.
With ignition switched on and Fresh Air Blower -V2- is actuated, fresh air blower control module connects B+ from terminal 4 of connector -C- to terminal 1 of connector -B-. Fresh Air Blower speed is regulated by fresh air blower control module via the ground connection between terminal 2 connector -B- and terminal 3 of connector -C-. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding" and Wiring Diagram.
Removing
-- Move the passenger seats as far back as possible.
-- Switch off ignition.
-- Remove glove compartment. Refer to Removal and Installation .
-- Disconnect the connector -A- and -B-.
-- Remove the screws -C-.
Heat sink on Fresh Air Blower Control Module may be hot.
-- Remove the fresh air blower control module -D- from the air intake housing.
Installing
Installation is carried out in the reverse order, when doing this note the following.
-- Check the Climatronic control module -J255- DTC memory and erase any displayed malfunctions if necessary using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
-- To check the function, perform an output Diagnostic Test Mode (DTM) on the A/C system using the Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.