BMW F20 engine N13
#FRONTELECTRONICMODULE #INTEGRATEDSUPPLYMODULE #ENGINECONTROLUNIT #S0392 #DME #FEM #IVM #CARNOTSTART #BMWF20 #BMWN13

How far I went to understand the reason why the car doesn't start or crank? Is the reason; dead DME, FEM unit, battery, short circuit or integrated supply module?

00:00 Intro
The car worked great about two weeks after the timing chain change!
The engine does not crank or start
Various check control messages will be displayed
Driving stabilisation failure
Flat Tyre Monitor (RPA) failure
Starter / ignition failure
00:55 Fault diagnosis with ISTAD
A total of 65 fault codes !!
Main fault code: S0392
No communication possible with engine electronics
Other modules have CAN faults stored due to missing messages from the DME
Let's look a little more closely fault codes
Main suspect: power supply for DME.
It would appear that the DME is not receiving power
Or the DME itself is faulty!
Reset engine control unit DME
Check voltage supply, integrated supply module
The engine control unit is not responding
04:44 Check all fuses
from the trunk, engine compartment, REM unit and also FEM unit
Replacing the battery did not help with this problem!
05:24 Diagnosis Integrated supply module
Let's take a closer look at the Integrated supply module,
It supplies power for DME
Check that the relays of the Integrated supply module are in ok
Measure resictances from relays from integrated supply module:
DME main RELAY, Valvetronic RELAY and
RELAY for the ignition and fuel injection
Resictances should be approximately 230 Ohm
06:16 Dismantle the Integrated supply module
check the fuses from inside the power distribution box
Dismantle with heat gun and sharp knives
Carefully! Do not cut too deep to avoid damaging the circuit board!
The power distribution box contains fuses and relays
Normally, If one of the fuses or one of the relays is faulty,
the complete power distribution box must be replaced
They say that fuses and relays cannot be replaced separately!
Remove the circuit board from the housing
08:48 Remove FEM front electronic module
Liquid found on the FEM unit connector ?!
Let's take a closer look at the FEM module!
Remove all connectors and loosen red lock
Unlock top positive battery cable connector and disconnect battery positive lead
Release bolt and remove control unit
09:52 Dismantle FEM unit
Remove fuses and do not mess up the order of the fuses!
The protective film on the circuit board has melted at one point
PIN 1 is for engine start signal from FEM to DME
There's green liquid in plug connector!
FEM unit back in place!
14:10 Measure voltages from components and sensors
Measure the voltage from the DME engine control unit body
At this point I started to doubt the DME unit,
15:48 Dismantle engine control unit
At this point, I decided to order a used DME motor control unit!

Let’s continue with the next episode! Stay tuned!


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Watch my previous videos on Youtube related to the maintenance and diagnose of BMW F20 with engine N13!
See the whole series from here:
   • BMW F20  Diagnosis and maintanence  


My purpose is to encourage people to do things themselves!
Plus, this is a nice hobby for myself and at the same time I have the opportunity to save a lot of money by doing all the maintenance myself!
I’m not a professional with cars or motorcycles, I just want to learn how to do things myself.
If you do this service yourself, always check the correct instructions in the official service manuals. This is just my way of doing it!

Jani Voutilainen

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