5 Series E61 523i (N52) TOUR
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Valve block
The valve block contains the solenoid valves, the hydraulic pressure sensor, the pressure accumulator and
a check valve.
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Solenoid valves
A total of 4 solenoid valves are installed in the valve block:
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1 solenoid valve for controlling the clutch actuator
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1 solenoid valve for shifting to 1st, 3rd, 5th gear and reverse (shift travel valve)
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1 solenoid valve for shifting to 2nd, 4th, and 6th gear
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1 solenoid valve for controlling the selector angle brake (for switching the shift gate). At the same
time, the solenoid valve serves as a pressure relief valve for the hydraulic system.
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SMG control unit
The SMG control unit (GS35) computes the actuation of the solenoid valves for clutch operation and gear
change. Moreover, the SMG control unit sends information to various control units, e.g. to the engine speed
adjustment and drive program indicator. (The SMG control unit can be programmed and encoded.)
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Reversing light
The reverse light is switched on on the basis of messages from the SMG control unit to the light module (LM).
Signal path:
Signals from the shift path sensor and from the selector angle sensor -> SMG control unit -> PT-CAN -> Safety
and gateway module (SGM) before 09/2005 or body-gateway module (KGM) as from 09/2005 -> K-CAN -> LM
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Transmission
The transmission housings of the 6-speed manual transmission GS6-37BZ and GS6-53BZ have been modified
to accommodate the following components:
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The hydraulic unit with the actuators for engaging and disengaging the clutch and for switching gears
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The additional sensors (shift travel sensor, selector angle sensor, inductive sensor for the transmission
input speed)
The construction of the transmission and the clutch remain unchanged.
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Instrument cluster display
The following information is displayed on the LC display (liquid crystal display) in the instrument cluster:
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Selected drive position
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Drive program
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Check control messages
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Operation in emergency program.
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Additional measured variables from the following components:
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Brake light switch
The brake light switch signal is transmitted on the PT-CAN (powertrain controller area network) by the DME
control unit. For reasons of safety, the signal is also transmitted by a direct wire from the brake light switch to the
SMG control unit.
The brake-light switch signal is used for the following operations:
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To release the shift lever lock (shift-lock)
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To detect a brake application
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To shift to "N" when the engine is shut-down
SBT Sequential manual gearbox E60, E61, E63, E64
BMW AG - TIS
06.02.2013 00:28
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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