•BMW DCT BIG HOWTO. <-- READ this guide, please, just do it before asking questions already covered.
•BMW DCT TCU firmware flashing.
•DCT Realtime Data description.
MaxxECU cable harness (ID: 2015) for the 335/M3 gearbox, you could make your own, but then you are on your own, we ONLY support our harness.
Note: we do not support the F-series gearboxes.
The actual BMW E9x gearbox...see DCT hardware identifier.
Note: If your intention is to pass more than 850-900Nm throu this gearbox, read our DCT hardware upgrade.
BMW E9x M3 shifter assembly.
The BMW drivelogic button.
Paddle shifters from example Mercedes, part number A 171 267 00 46. Or any other paddle shifters (or buttons on the steering wheel) that "closes" the circuit when pressed.
We do not support the stock BMW paddles.
Description |
Part no |
Note |
MaxxECU controlling the engine |
All MaxxECUs |
Preferable with E-Throttle (but works with regular wire also). |
BMW M3 E9x DCT gearbox |
GS7D36SG |
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BMW M3 E9x DCT gear selector |
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BMW M3 E9x DCT shift knob with boot |
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Drivelogic button |
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BMW INPA or other diagnostic tool for DCT |
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Vehicle speed input (wheelspeed sensor). |
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Vehicle speed input is REQUIRED (preferable on UNDRIVEN WHEELS) |
Any paddle shifter (which closes a circuit). |
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If you want paddle shifters, which you most likely want... |
MaxxECU DCT cable harness. |
We ONLY support this cable harness, if you make your own, you are on your own... |
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DCT transmission fluid |
Most DCT/DSG oil will most likely work... |
The above 2-pin connectors is not used in our harness, our intention was to use the park feature on the gearbox, but we disabled its usage and you must instead use a park disabling mechanism,
A similar park unlock mechanism MUST BE USED since we do not control the park solenoid, it can be bought here (product ID: 2015).
Pin |
Description |
335/M3 Usage |
Note |
Mechatronix pin |
1 |
Paddles signals |
Multiplexer input |
5.5V (normal), 4.1-3.3V (shift+), 1.6-2.1V (shift-) |
3 |
2 |
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3 |
CAN L |
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2 |
|
4 |
+12V (wake up) |
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|
10 |
5 |
Paddles Sensor GND |
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5 |
6 |
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7 |
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8 |
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9 |
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10 |
CAN H |
|
7 |
|
11 |
LIN GWS |
LIN backup signal from Gear Selector Switch |
|
11 |
12 |
+12V |
Parking lock |
|
15 |
13 |
+12V |
Signal parking lock |
|
13 |
14 |
+12V fused 12A |
Power supply for DCT |
16 |
|
15 |
Park signal to ECU |
1 |
||
16 |
GND |
Chassie GND |
14 |
DCT connector (gearbox side)
Pin |
Description |
Usage |
Note |
1 |
+12V |
Power supply |
|
2 |
LIN bus |
Backup from GWS |
|
3 |
CAN L |
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4 |
CAN H |
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|
5 |
+12V |
Wake up power |
|
6 |
GND |
Chassie GND |
|
7 |
Drivelogic - |
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|
8 |
Drivelogic + |
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Pin |
Description |
Usage |
Note |
1 |
GND |
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2 |
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3 |
Drive logic + |
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4 |
+12V |
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5 |
Drive logic - |
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6 |
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Pin |
Description |
Usage |
Note |
A |
+12V power supply |
Must be powered at the same time as MaxxECU |
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B |
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C |
CAN H |
To MaxxECU CAN H |
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D |
Paddle UP shift |
Paddle GND this input to trigger UP SHIFT |
Do NOT put any other ground than the Paddle GND to this input! |
E |
Park signal |
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F |
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G |
GND |
To chassie/engine GND |
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H |
Paddle GND |
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ONLY to be used as the paddle shifter ground point, NOTHING ELSE!!! |
J |
CAN L |
To MaxxECU CAN L |
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K |
Paddle DOWN shift |
Paddle GND this input to trigger DOWN SHIFT |
Do NOT put any other ground than the Paddle GND to this input! |
L |
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M |
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