N55 Equipped Cars

Special thank you to Evan Schulte for taking the time to put together the following guide!

Overview

The biggest difference for N55 is that the DME is located under the intake manifold rather than in the “DME box”.  The DME box in N55 cars stores some plastic dividers and a few relays/fuses.

Shown: N55 “DME box”

Removing all of the contents in this box will leave you with 4 connectors.  1 of these connectors is x60001, this is the only connector you will need to use wires from in this box.  I chose to cut the connectors off and terminated all of the wires with heat shrink to free up any space I could in the DME box.

Shown: Connector x60001

X60001

This is the connector that you will use for DBW, Radiator fan, key on power, and CAN interface.  This connector also has other pins that can be used if desired, but are not required for the swap.

Holley Main Power

Wire the holley main power wire directly to your battery.  There is a relay on the battery of these cars which will switch off the power that goes to the DME after x period of time - this will cause your Holley unit to lose tune and TPS autoset will need to be done again.  This can be coded out, but the best solution is to just wire the Holley directly to the battery - Holley also tells you to do this in all of their ECU manuals.

Holley Key On Power - UPDATE recommend to use the cigarette lighter fuse at fuse 8 with a fuse tap for a key on ignition source.

Note: Some people have used pin 8 (blue/red) as a switched power source.  This switched power source turns on/off quickly when the car is unlocked/locked, when doors open, and various other reasons.  It technically does provide power with ignition, but it also provides unwanted short bursts of power that may not be good for the holley unit in the long term.

Shown: Connector x60001, power region

Pinout:

BMW Start car to brake switch mod

This is required on an factory automatic car to get the start button functional. If you had a factory manual and are still a manual you do not need to do this. If you are a factory manual and now automatic you do need to do this and additionally jump the clutch switch.

You need to connect pin 5 on connect x6031 which should be a blue/black wire to the brake light switch on the X600001 DME connector pin 8. This will send the 12v brake signal to the CAS pin 41 when the brake switch is pressed allowing the start button to function correctly.

Connect pin 1 on x6011 (large gauge black wire) to starter solenoid

Drive By Wire

Shown: Connector x60001, accelerator pedal region

Pinout:

Radiator Fan

Shown: Connector x60001, radiator fan region

Pinout:

To configure your holley unit to control the radiator fans, follow the link below to Michael Page’s documentation.  Be sure to take note of which output wire you use on the holley harness as this will be used in the configuration.

Alternator

This is assuming you have a 1 wire alternator.  The green (fuel pump) wire from the holley harness is a good option to wire up the exciter wire.  You really just need any 12v ignition signal with a 470ohm resistor inline.  The resistor is important to avoid burning out the alternator’s voltage regulator.

LSE9x Can Box coding N55 chassis

Disclaimer: be sure you understand how to properly code and backup the factory coding of these cars before you continue.

Using Android app and Protool with any compatible cable.  Amazon K-can cable with adapter works

then go to coding  -> edit coding -> expert --> 



Then change this value, there should be only two options, change it to the one not selected. Then re-code the kombi.