RIGHT KNOB FOR SEAT HEATING (AND NECK HEATING) ON Front A/C Display Control Head 5 -E778-, REMOVING AND INSTALLING: Installing
Install in reverse order of removal. Note the following:
The control heads for the left and right side exchange information with the Climatronic Control Module -J255- via a "LIN Bus" data wire. The left and right knobs emit different signals. Therefore, a knob may only be installed on its designated side. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
There are different versions of the Front A/C Display Control Head 5 -E778- (for example, for the left and right seat, for vehicles with or without neck heating, etc.). Ensure the correct version and allocation.
Different data signals from the Climatronic Control Module -J255- control head sent on the LIN Bus data wire are used to allocate the signal for the seat heating activation (and/or neck heating) from the Front A/C Display Control Head 1 -E774- for the left seat and the signal from the Front A/C Display Control Head 5 -E778- for the right seat. For problems with seat heating activation (and/or neck heating) on identical or interchanged control heads, use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function (for the Climatronic Control Module -J255-). Refer to the appropriate Wiring Diagram.
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.
-- Then check the function of the seat heating (and the neck heating).