1 Series E87 118d (M47T2) 5-door
The FZD control unit operates as a data interface for the condensation sensor as follows:
•
The FZD control unit receives the signals from the condensation sensor via the interior mirror connector.
The signals from the condensation sensor are pulse-width-modulated. The signals indicate the relative
moisture on the inside of the windscreen.
•
The FZD control unit converts the signals from the condensation sensor into digital messages for the K-
CAN.
•
The IHKA control unit receives these messages via the K-CAN. The demisting program is started
accordingly.
Gateway for Check Control
The roof control panel issues Check-Control messages providing information about the sliding/tilting sunroof.
•
Anti-trap circuit
•
Loss of normalisation following mechanical actuation: If the sliding/tilting sunroof has been moved
mechanically using the emergency actuating unit, the tilted end stop must be taught in again
(normalisation).
[for further information, please refer to SI Technology (SBT) 61 08 03 030]
Gateway for the electrochromic interior mirror and for the electrochromic exterior mirrors
The FZD control unit is the data interface between the electrochromic interior mirror, K-CAN and electrochromic
exterior mirrors.
The electrochromic exterior mirrors are controlled as follows when a request is sent via the electrochromic
interior mirror:
•
The electrochromic interior mirror sends a signal to the FZD control unit.
•
The FZD control unit evaluates the signal and converts it into a percentage value (the percentage by which
the exterior mirrors are to be dimmed).
•
The FZD control unit sends this percentage value to the footwell module (FRM) via the K-CAN.
•
The footwell module (FRM) sends the "Dim electrochromic exterior mirrors" request to the driver's door
switch block.
•
The driver's door switch block forwards the request to the electrochromic exterior mirror electronics. The
electrochromic exterior mirrors are dimmed accordingly.
For safety reasons, the electrochromic mirrors are not dimmed when reverse gear is engaged.
•
If the vehicle has a manual transmission, the reverse-light switch will send a signal to the footwell module.
The message is forwarded to the FZD control unit from the footwell module via the K-CAN.
If the vehicle has an automatic transmission, the FZD control unit will receive the message "Reverse gear
engaged" from the EGS control unit (via the K-CAN).
(EGS: Electronic transmission control; SMG: Sequential manual transmission)
•
The electrochromic mirrors are not dimmed until the reversing manoeuvre has been completed.
Preconditions for activation
The FZD control unit is active under the following conditions:
-
Terminal R ON, or
-
Terminal 15 ON and
-
K-CAN active
If none of these 3 conditions is met, the FZD control unit will switch to sleep mode
and can be woken up by pressing the buttons for the interior lighting.
SBT Roof control panel E70, E81, E87, E90, E91, E92, E93
BMW AG - TIS
18.01.2013 18:39
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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