KNOB FOR AIR DISTRIBUTION ON Front A/C Display Control Head 4 -E777-, REMOVING AND INSTALLING: Installing
Install in reverse order of removal. Note the following:
The Front A/C Display Control Head 4 -E777- exchanges information with the Climatronic Control Module -J255- via a "LIN Bus" data wire. The signal emitted by the Front A/C Display Control Head 4 -E777- is different depending on the A/C system version. A knob (a Front A/C Display Control Head 4 -E777-) may therefore only be installed on a vehicle with an A/C system to which it was designated. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
There are different versions of the Front A/C Display Control Head 4 -E777-. Ensure the correct version and allocation.
The various display control knobs and instrument panel vents are coded to each other through groove and tongue connections, therefore pay attention to the correct allocation of these components to each other.
There are different versions of the instrument panel vents depending on the component location. Pay attention to the correct arrangement.
-- Check the foam seal -1- on the instrument panel vent for damage and proper adhesion.
-- Check the connectors in the instrument panel vent -2- and on the display control knob -4- for damage and contamination.
-- Insert the display control knob -1- into the instrument panel vent on the proper side -arrow-. While doing so, pay attention to the connectors -2 and 4-.
-- Slide the display control knob -1- all the way into the instrument panel vent and secure it with the pin -3-.
-- Secure the pin -3-.
-- Connect the connector -2-.
-- Install the instrument panel vent. Refer to INSTRUMENT PANEL VENT, REMOVING AND INSTALLING and OVERVIEW - INSTRUMENT PANEL .
-- Check the DTC memory (of the Climatronic Control Module -J255-) and delete any displayed entries using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
-- Check the heating and A/C system function.