Automated manual transmission control unit

[jwight]

So, what's really controlling the transmission?

Location
The automated manual transmission control unit is located in the passenger compartment under the driver seat.
General
The transmission control converts the driver's shift requests into corresponding control signals to the clutch and the 5-speed automated manual transmission. This is done by relaying the shift signal about the shift request at the electronic selector lever module control unit over a direct line to the automated manual transmission control unit. The automated manual transmission control unit checks the plausibility of the shift request in relation to the vehicle speed, the load (accelerator pedal position) and the engine speed. If the plausibility check is passed, the automated manual transmission control unit sends the signal to initiate the selected shift operation to the two actuator motors for the two selector drums and to the clutch motor to open or close the clutch.
Task
The automated manual transmission control unit controls the following functions depending on the input information:
• Engaging first gear at vehicle standstill
• Gear change
• Compulsory upshift just before maximum engine speed is reached
• Compulsory downshift when engine idle speed is approached
• Downshift for kickdown
• Disengaging the gear after 1 s when a door is opened without the service brake or accelerator pedal being actuated
• Crawl function
• Clutch operation
• Monitoring of clutch load

The automated manual transmission control unit directly reads the signals from the following components:
• Transmission rpm sensor (L2)
• Transmission motor 1 (M17/3)
• Transmission motor 2 (M17/4)
• Clutch motor (M18)
• Electronic selector lever module control unit (N15/5)
• Park pawl switch (S16/2)

[xcrew229x]

Ok, John, that' a bit more informative than any other similar posts here, is there a LOT more where that came from? Inquiring minds need to know........

[jwight]

It's all in here, and more: Smart Car technical spec manual

[Karl Roth]

This stuff can't be right. The salesman didn't tell me any of this stuff...lol
karl

[mvaldes]

Being able to paddle shift while in "D" is nice. I actually use that on our Mini.

[SmartCard]

under the driver seat huh?
That explains the irregular shifting behaviour when I pass gas!

[mvaldes]

Originally Posted by SmartCard

under the driver seat huh?
That explains the irregular shifting behaviour when I pass gas!

...and new meaning to the "three bars of death"

[jwight]

Originally Posted by mvaldes

Being able to paddle shift while in "D" is nice. I actually use that on our Mini.

Not on the 08s, but apparently has been added to the 09s.

[Evilution]

This was all controlled by the ECU before in the 450 but the addition of an extra gearchange motor and their insistence on using a dumber ECU meant the job had to be farmed out to an extra unit.

[VinceLA]

Originally Posted by jwight

Location
The automated manual transmission control unit is located in the passenger compartment under the driver seat.

I don't quite get it....there is the passenger's side, and the driver's side. How do you get to the "passenger compartment under the driver seat"? Under the driver's seat belongs to the driver's side.

Is this one of those "the left side of your right hand" thing?