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Navigation: Wiring information

BMW DCT (wiring)

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BMW DCT related links

BMW DCT BIG HOWTO. <-- READ this guide, please, just do it before asking questions already covered.

BMW DCT error codes.

BMW DCT TCU firmware flashing.

BMW E9x DCT CAN protocol.

BMW INPA diagnostic tool.

DCT clutch relearn.

DCT hardware identifier

DCT hardware upgrade.

BMW installation and wiring.

DCT Realtime Data description.

DCT shifting options.

MTune - DCT Control.

MTune - DCT Settings.

 

Hardware needed for E9x BMW M3 DCT gearbox installation

 

 

1 - DCT cable harness between MaxxECU and DCT gearbox.

clip1107

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.

 

 

2 - BMW E9x DCT/DKG gearbox (GS7D36SG)

Note: we do not support the F-series gearboxes.

clip1110

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.

 

3 - BMW M3 shifter

clip1108

BMW E9x M3 shifter assembly.

 

 

4 - Drivelogic button

clip1109

The BMW drivelogic button.

 

 

5 - Paddle shifters

clip1111

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.

 

 

Required hardware and inputs

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

 

BMW M3 E9x DCT gear selector

61317842102

 

BMW M3 E9x DCT shift knob with boot

25122283705

 

Drivelogic button

61317835039

 

BMW INPA or other diagnostic tool for DCT

BMW INPA

 

Brake pedal/stop light active input.

 

 

Vehicle speed input (wheelspeed sensor).

 

Vehicle speed input is REQUIRED (preferable on UNDRIVEN WHEELS)

Any paddle shifter (which closes a circuit).

 

If you want paddle shifters, which you most likely want...

MaxxECU DCT cable harness.

2015

We ONLY support this cable harness, if you make your own, you are on your own...

DCT transmission fluid

Pentosin FFL-4

Most DCT/DSG oil will most likely work...

 

 

 

clip1319

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,

 

clip1320

A similar park unlock mechanism MUST BE USED since we do not control the park solenoid, it can be bought here (product ID: 2015).

 

 

 

X8500 (DCT gearbox connector) pinout (not the cable side) of the actual connector (not gearbox side).

clip0986

 

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

-

 


 

3

CAN L

 


2

4

+12V (wake up)

 

 

10

5

Paddles Sensor GND

 

 

5

6

-

 

 

 

7

-

 

 

 

8

-

 

 

 

9

-

 


 

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

Not used

Park signal to ECU


1

16

GND

Chassie GND


14

 

clip1112

DCT connector (gearbox side)

 

 

X1708 (Gear Selector Switch)

clip0985                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

Pin

Description

Usage

Note

1

+12V

Power supply


2

LIN bus

Backup from GWS

 

3

CAN L

 


4

CAN H

 

 

5

+12V

Wake up power

 

6

GND

Chassie GND

 

7

Drivelogic -

 

 

8

Drivelogic +

 

 

 

 

 

X8503 (Drivelogic switch)

Pin

Description

Usage

Note

1

GND

 

 

2

-

 

 

3

Drive logic +

 

 

4

+12V

 

 

5

Drive logic -

 

 

6

-

 

 

 

 

 

12-pin GT150 connector

Pin

Description

Usage

Note

A

+12V power supply

Must be powered at the same time as MaxxECU

 

B

-

 

 

C

CAN H

To MaxxECU CAN H

 

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

 

 

F

-

 

 

G

GND

To chassie/engine GND


H

Paddle GND

 

ONLY to be used as the paddle shifter ground point, NOTHING ELSE!!!

J

CAN L

To MaxxECU CAN L


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

-

 


M

-