After replacing the E87 control unit, check and, if necessary, correct the code, perform the basic installation and read the faults.
If the display shows a temperature of 22°C, regardless of the set temperature, check the connection of the terminal «30» in accordance with the electrical diagram.
The E87 control unit can be activated after the ignition is switched off (up to 30 min) at the touch of a button «Rest».
In the event of an incorrect temperature measurement by the G56 sensor, check the condition of the air intake grille.
Vehicles with air quality sensor G238 can be identified with the button A For «automatic air recirculation» (automatic air recirculation) instead of a button Off on the control unit E87.
Withdrawal
Control units with indices up to «K»
Remove central ventilation grilles.
Remove the central section of the instrument panel.
Disconnect the electrical connectors from the back of the control box.
Pic. 17–17. Screw location (A) fixing the air conditioning control unit
Unscrew the four screws securing the control unit and remove it (pic. 17–17).
If the E87 control unit does not come out of the center section of the instrument panel, first remove the trim panel «under the tree» from the center section of the instrument panel.
Control units with indices up to «M»
Remove central ventilation grilles.
Pic. 17–18. Removal of an overlay of the central section of the panel of devices
Remove the overlay of the central section of the instrument panel (pic. 17–18).
Remove radio or navigation unit.
Different design of the decorative panel of cars with a radio receiver is possible (with large control panel) or the navigation system unit, as well as the control unit with display on vehicles with heated seats.
Pic. 17–19. Screw location (A) fixing the air conditioning control unit
Remove the four screws securing the control unit (pic. 17–19).
Disconnect the electrical connectors from the back of the control box.
Disconnect the rear window heater electrical connector.
Remove the seat heater switches. To do this, release the latches and, pulling back, remove the switch.
Installation
Installation is carried out in the reverse order of removal.
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