5 Series E61 523i (N52) TOUR
In parallel to the Hall-effect sensor signals, the control unit measures the current required for the pivoting
movement.
If the permissible current consumption of the DC motor is exceeded during fully automatic pivoting out or in, or
no Hall-effect sensor signals are emitted, the ball head's pivoting movement is halted. The ball head is pivoted
back a short way in the opposite direction (reversed).
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Loudspeakers
> E90 up to 09/2005
The loudspeaker is located on the left under the rear window shelf. An acoustic signal is emitted when the ball
head is unlocked.
The loudspeaker indicates a Check Control message with a continuous tone.
The loudspeaker is actuated by the trailer coupling release control unit.
Several control units are involved in the trailer coupling release:
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Control unit for the trailer coupling release or electrically pivoted trailer coupling
> E60, E61: Control unit for the electrically pivoted trailer coupling
> E90, E91, E92, E93: Trailer coupling release control unit
The control unit energises the drive system's direct current motor. The control unit is not directly connected to
the bus system. The control unit is not capable of self-diagnosis, nor can it be programmed.
> E60, E61
[more ...]
> E90, E91, E92, E93
[more ...]
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CAS: Car access system
The CAS control unit supplies the input signal for the status of terminal 15 at the control unit for the trailer
coupling release (E90, E91, E92, E93) or for the electrically pivoted trailer coupling (E60, E61).
With terminal 15 ON, the trailer coupling cannot be released or pivoted out or in.
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AHM: Trailer module
The trailer module is directly connected to the control unit for the trailer coupling release (E90, E91, E92, E93) or
to the control unit for the electrically pivoted trailer coupling (E60, E61). In the event of a system error, the trailer
module will generate a Check Control message.
The trailer module furthermore serves as a trailer detector. The trailer module identifies a trailer as connected if
at least 2 loads (cold measurement) are detected at the lighting output terminals. The trailer module then
transmits the message "Trailer connected" along the K CAN.
This message is translated by several control units in the towing vehicle. For instance, the ultrasonic sensors at
the rear of the towing vehicle are deactivated via Park Distance Control. The footwell module (E90, E91, E92,
E93) or lights module (E60, E61) deactivate the rear fog light and reversing light on the towing vehicle.
Other components:
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Power distributor in junction box
> E90, E91, E92, E93
The electrical distribution center in the junction box supplies power to the trailer coupling release control unit
(terminal 30g).
The junction box consists of the junction box electronics (JBE) and electrical distributor.
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Front and rear electrical distributors
> E60, E61
The front electrical distributor supplies the control unit for the electrically pivoted trailer coupling with power
(terminal 30).
SBT Electrically operated trailer coupling E60, E61, E90, E91, E92, E93
BMW AG - TIS
06.02.2013 01:23
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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