SE Drive Smart 450

[Jomac]

I am working on a conversion system for changing gears that does not require any programming of the SAM or any other unit in the car. I have used Jaguar XF gear paddle switches which are easy to mount. The gear up and down is transmitted using a small radio module and the receiver will connect to the original SE Drive PCB. I have designed a small logic board that connects between the receiver and the SE Drive PCB which switches and routes the signals correctly when changing gears, the logic fools the SE Drive into thinking you are changing gears on the gear lever and not on the steering wheel. I am after the full circuit so I can see if there is an easier way to interface the receiver and the logic interface board.

[Ahnungslos]

A easy way to realize the paddleshift without activation keys and programming already exists for Smarts with ZEE before BJ 2003.

Look at this site!

This little box will be connected in the cable connection between the SE Drive and the ECU.

The output of the SE Drive is the Input of this box and the connection to the ECU is the output of this box.

 

The paddleshift of the smart is based on the Voltage level of the horn connection.

If you press the up or down Button of the paddleshift, the voltage level of the horn connection assumes a defined value.

The resistors in the paddles form a voltage devider and the voltage Level takes on a value depending on the resistors.

The voltage level of the Horn connection will be guided via the cicuit of the pcb.

And the box will form the switching commands for the ECU.

I think your logic board should have the same functions to modulate the switching commands like this box, in this case based on the signals of your Paddle Receiver Module.

The switching commands to the ECU are based on the Informations of the Pins 3,4,5 and 8 from the SE Drive Unit.

Pin 9 is for the sending of the switching mode Manual or Automatic to the ECU.

 

The Connections between the SE Drive and the ECU will be listed on that site.

And the complete connections of the ECU will be listed here.

 

I think it will be a problem to get a detailed full schematic or complete circuit diagram of the SE Drive. 🥺

This is a well-kept secret of Mercedes/Brabus.

bearbeitet vor 22 Stunden von Ahnungslos

[Jomac]

vor 22 Stunden schrieb Ahnungslos:

An easy way to realize the paddleshift without activation keys and programming already exists for Smarts with ZEE before BJ 2003.

Look at  this site!

This little box will be connected in the cable connection between the SE Drive and the ECU.

The output of the SE Drive is the input of this box and the connection to the ECU is the output of this box.

 

The paddleshift of the smart is based on the Voltage level of the horn connection .

If you press the up or down Button of the paddleshift, the voltage level of the horn connection assumes a defined value.

The resistors in the paddles form a voltage devider and the voltage level takes on a value depending on the resistors.

The voltage level of the Horn connection will be guided via the circuit of the pcb.

And the box will form the switching commands for the ECU.

I think your logic board should have the same functions to modulate the switching commands like this box, in this case based on the signals of your Paddle Receiver Module.

The switching commands to the ECU are based on the information of the pins 3,4,5 and 8 from the SE Drive Unit.

Pin 9 is for sending the switching mode Manual or Automatic to the ECU.

 

The Connections between the SE Drive and the ECU will be listed on  that site.

And the complete connections of the ECU will be listed  here.

 

I think it will be a problem to get a detailed  full schematic or complete circuit diagram of the SE Drive.  🥺

This is a well-kept secret of Mercedes/Brabus.

I have seen this other website Evilution, I am a paid for member there and I have been talking to Kane, the owner of the website about this paddle shift. Whichever system you try to use you are faced with great expense and some of the conversions also require programming at a cost of around £100. Then you have the added problem of finding a steering wheel which has the gear change paddle switches already fitted, I have been watching eBay and other websites for quite a few weeks and I've not found a suitable steering wheel. The conversion I have done does not require programming, It is done by using 433MHz remote control, the receiver and logic are mounted next to the SE Drive PCB and no wires need to be run up to the steering wheel. I designed a simple interface that prevents the gear change system from sending more than one signal back into the car, I wasn't sure how the car would react to receiving more than one signal. This interface simply copies the gear + and Gear - signals. The total cost so far is less than £25 for a working system. An earlier post here showed part of the SE Drive circuit, this wouldn't have been done by Mercedes, the schematic looks like it has been done using Eagle, a PCB design software, someone has reverse engineered the SE Drive circuit board. Whilst my system works, having the schematic would be useful to see if the idea can be simplified.