BMW E46 K-Bus Devices

Every once in a while I get a call from someone what has all sorts of problems with their E46 BMW. Not just door locks, but, turn signals, sunroof, windows, dash lights an the list goes on. I just tell them it's a problem with the K-Bus, which usually makes more confused and I haven't researched it so I can't help. So I decided to start looking into what is on the K-Bus. Here is story of someone who had a K-Bus problems

After poking around the BMW WDS I found what I was looking for. A diagram which showed everything on the K-Bus. Ok, here it goes.

A1 - General Module
A2 - Instrument Cluster Control Unit
A3 - Light Switching Centre Control Unit
A11 - Heating and A/C Control Unit
A12 - Multiple Restraint System Control Unit
A21 - Driver's Seat Memory Control Unit
A33 - Sunroof Module Control Unit
A81 - Park Distance Control (PDC)
A85 - Tire Pressure Control System Control Unit
A169 - Switch Center
A212 - Mirror Memory Control Unit Driver's Side
A213 - Mirror Memory Control Unit Front Passenger Side
A417 - Tire Defect Indicator Control Unit (RPA)
A836 - Electronic Immobiliser Control Unit
B57 - Rain Sensor
IO1002 - Volute Spring (steering wheel controls)
N9 - Radio Control Unit (head unit)
N22 - CD Changer

The letter number preceding the control unit is the module number. If you want to find it on the WDS just go to control units and look up the letter/number and it will take you right to it. The K-Bus is wire number X10116 and is on a WS/RT/GE (White/Red/Yellow) colored wire with 0.35 diameter or approximately 20 AWG.

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