Mercedes W220 S320 - Right SAM module, does not start, locks the key

Hello, vin: WDB2200651A019279 (w220 s320 99r benz + lpg)

Fault: when replacing the compressor I wanted to replace the relay in the right SAM module, by mistake I took out the motor electronics relay (K) instead of (N), so everything went out in the car (the car was always connected to the AKU). In the main fuses from the modules under the passenger's feet (the so-called cartridge) it fuses and burns the plug of the brown cable (attachment), I replaced the right module with the same number [A 027 545 45 32] and the whole cartridge and the car came alive, almost everything works, clocks , displays gears, reads the key, however, it DOES NOT DUST. Something terribly sypi on the CAN bus, after the first attempt to fire, the key is blocked, the fan is turned on to the max and the ignition can not be turned on until the battery is unplugged. After this you can re-insert the key, the steering wheel leaves and you can only turn the ignition once, then lock the key completely but each time after inserting the ignition key the steering wheel leaves. I thought that "I do not read" the new SAM module, but inserting the old original SAM tape does not change anything.

symptoms:
1. The clocks are lit, the airmatica compressor works, everything inside works normally.
2. Displays the position of the transmission.
3. When attempting to start, the radiator fan turns on, the temperature from the board disappears, then locks the key and it can not be turned again.
4. The connected SD sees low battery voltage (7-8V while the battery has 12.3V) so I have to have charged SD batteries to do anything.
5. SD is not able to communicate with the device when all plugs are plugged in, it freezes while the ignition is on.

Interestingly: Disconnecting the plug from the right SAM module marked with a red cable and white with a red stripe (photo) allows normal turning of the key in the ignition, however, the gearbox position disappears on the dashboard and the car does not start, however, in this situation the SD is able to communicate and make a short test. A lot of mistakes are poured out on the test. The voltage on these two cables is 12V, the same disconnection of the brown cable does not give anything, must be disconnected these two thick cables (probably go to the ignition?) And then the car "functions normally"

Any suggestions? Please help. Soon I will try to do a "clean short test", i.e. remove all the trouble codes, connect the plug - I will try to start the car, disconnect the plug and run a short test again to see which trouble codes are there.

A photo of this unfortunate plug (goes to the red relays, I'm not sure but the brown goes probably to the starter relay)

Somewhere you probably do not have mass (scorched, stitched)

That's exactly what I think, however, the brown cable visible in the photo has mass, I bet there is no permission to start because some module lost mass and sheds a lot of errors on CAN, I will be doing a communication test in SD and put a log in the forum. In general, how do you think this brown cable burnt in the picture can be taken elsewhere? I can not find it in wis or epc

Kubik213 wrote:

when replacing the compressor

there is no weight in the stringer in the area? The fuses and ankles do not burn from the outlet of the relay system.

nothing related to the compressor and airmatic, the airmatic works very well even the SD detects it and does not see any problems. I place a .pdf from the test with SD with the plug removed (ie you can not see the gear on the meter and the key can be turned as much as you want). In addition, I found such a mane that I can plug in and remove fuse No. 49 from the front right SAMa, which is marked as connector 15. How much do I guess the connector is connected to power after turning the ignition? Generally, when I take out this fuse, the board displays the gear positions and the key can be turned as much as you want (does not block the key) however, the SD does not connect, there is no communication - the ignition of the SD does not see it (ignition, of course).

In addition, in the communication with the plug unplugged the error of the motor controller, gearbox, etc.

The question is also why is there only 8V in the socket (terminal 15)? In general, the 15R relay is already 10V after turning the ignition switch



Added after 2 [hours] 25 [minutes]:

In general, one more curiosity, I got into a different DELPHI interface this time and it's better than SD. Delphi normally read all the modules and snoozed errors that SD did not see, SD has big problems with communication because he sees a very low voltage, etc. And a very interesting curiosity, while the interface from Delphi is normally auto CROSS, but does not start !!! So it looks as if Delphi releases the CAN line and communication between modules is possible? and the motor controller transmits a signal to start the car?

Give mass from aku to bude and engine.

the mass on the shed is, because the battery directly goes to the body of the car, the engine is also rather mass because the starter turns on the short and at the hook delphi was spinning all the time, but in the morning I will try and give the mass directly from the engine, although I think to find all the points of mass in the car and clean them with IPA, abrasive paper and connect again.

Another thing I found is the fact that "terminal 15" which in my case has a low voltage of 8V goes just to the coils on the motor through this 20A fuse, it is a clamp that gives the battery voltage after turning the ignition switch, for me this voltage is only 8V instead of 12.5V, the question is where does it lose tension? Terminal 15 exits from the EZS ignition switch to the right and left modules, in the left. There is a 15 and 15R relay, both have some strange voltage, instead of 12V it was 10V

I think that with your delphi tester you confine the mass in OBD pin 4 and 5.

hmmm interesting, just what does it mean then? pin 4 and pin 5 have different mass connection points? at the entrance in the morning I will check the voltage on the OBD2 plug (pins 16 and 4/5) and the voltage / transition between pin 4 and 5

Added after 13 [hours] 32 [minutes]:

You think, pin 4 is the mass of the battery and pin 5 is the signal mass and now to the point:
Pin 4 has access to ground, zero problems.
Pin 5 has no mass at all, there is voltage and now:
* If all cubes and fuses are inserted as it should be, it indicates 9V voltage constantly, regardless of the state of the key, but then it locks the key! (I took the mass from the shock cup)
* If I eject the cube (the one with two thick cables and one brown one from the photo) supplying the right SAM, the voltage drops almost to 0 (about 0.1-0.2V)
* If I pull out the 20A fuse, the voltage is 9V only in the case of ignition (it's obvious because this 20A fuse is responsible for the connector 15 which gives power when the ignition is on)
* If I pull out the motor electronics relay, the voltage drops to ~ 0.1V !! This is the first relay on the side of the windshield, the relay works, ticks, then you hear something snapping in the engine, something goes on there and suddenly on pin 5 (potential GND) 9-10V appears.

How well do I think this short circuit occurs somewhere when the motor electronics are switched on, i.e. the starter or something else causes a short circuit to ground? generally how to look for it now? Evidently something in the engine, engine electronics, I wonder what is under this.
I gave the engine mass, but there was no difference, in general the mass on the engine is, I checked with the mass of the car body. Any ideas?




Added after 27 [minutes]:

I am wondering if I am accidentally offended by the engine driver? does the motor electronics relay also activate the motor computer or does the motor computer always be energized, even without this relay?

Added after 47 [minutes]:

I took out the ECU and the voltage dropped almost to 0 (0.02-0.03V) I think I also have a culprit ... Anyone have an idea how to manually change flash and eeprom or the same eeprom to the used ECU? If I only sell the eeprom memory to a stimulant, it's probably enough?

Search where the mass of the injection beam has disappeared, is somewhere bolted to the engine

you think this is not ECU fault, only the injection beam has a short circuit ?? With the ECU removed, just the voltage disappears, I understand that ecu gives voltage for injection, etc.? ECU dismantled, in the middle of no signs of burning, short circuit, could possibly transistor somehow but I doubt, and besides how to connect the Delphi interface is the engine turns - it also in my opinion eliminates the ECU fault ... the injection beam for review? What signals should be on the injection beam?

The beam has no short circuit, there is no connection to the ground, therefore there is voltage on the signal pin of the obd connector after connecting the motor controller

Well, I'm already lost, is it a normal symptom when the beam on the engine loses mass? Generally I connected the motor controller and I noticed that unplugging this plug (marked as C) causes the voltage to drop to 0 (picture below). Cables from this plug do not go to the injection beam, they only go out and go to the airmatic valves and towards the left SAM, they do not go directly to the engine, the engine comes out with the two plugs on the right side. ECU failure can I reject? Generally, I did not see any mass on the injection beam, I also disconnected all the injections but nothing changed

Buddy as there is no weight plus "retreating" after mass cables not having this mass? /? Power loop. No easier. If you do not get involved, take it to the recommended electrician because in a moment you will not be able to save. And check from the beginning what you were buried and where, as I have written since removing the relay, nothing has the right to burn.

I have checked the mass of the engine mass, right and left SAM also have a mass, I checked 4 points of mass, can go the way of the PIN5 wire from the diagnostic socket and look where it comes from mass? As if the ECU was being whacked, the car would not be spinning after plugging in under the delphi, right? I wonder why it does not start with delphi, no power supply for coils, injections?

See the mass point behind the dashboard if it is not burnt there. You need to pull out the indicators.

Here I put a schematic from the WIS, evidently masoey no. 5 goes to the right SAM and he just burned here to me, and the right one to the ME or engine driver. I also checked the mass cable under the legs of the passenger but this is according to the scheme of pin 4 and is fully OK.


Added after 49 [minutes]:

There is no mass points behind the indicator board, there is only a bunch of clocks, the cable referred to (pin5) is brown with a white stripe, however it enters just behind the socket for a large bundle and this bundle goes to the front of the wall so you can see

Added after 9 [minutes]:



in my opinion it is clearly an ECU, this signal mass from it is coming out, through the comfort module right SAM up to the diagnostic socket

See this mass.

Your meter measurements, without load, do not give much, they even mislead you. Masses check with a light bulb, with power supplies, do not combine. Masses check directly on the pins, because the cable in the connector can be fired.

Also, the problem solved gentlemen - sincerely thank you for your help, although they were not accurate, it led me to solve the mystery

Cause? Burnt ECU. I do not conceal that before this I checked all connections of the mass to the body, etc., I flew almost the entire WIS, all points to mass, a lot of diagrams and everything connected to ECU. Yesterday I ordered a used ECU with the same numbers (this is important!) For only PLN 44 (including shipping), today I reached it, I searched the internet and found the EEPROM memory of the immobilizer in ECU. I sold the old scatter to a new computer and voila, SD is connected, the car fires. At the beginning it was 4 cylinders, two ignition coils were burned (before that the engine worked perfectly).


In addition, when the radiator fan starts spinning, he announces no communication with the ECU. To make sure, as soon as I used the used ECU with a completely different eeprom I threw it into the car and checked the behavior after turning the key. Pin 5 did not have reverse voltage, SD communicated and the only mistake was the error of the authorization of the start up, the cooler fan did not spin. If someone has a similar problem, it is worth even ordering ECU and insert, check the behavior of the engine and connect with the modules. In the event that nothing changes, you can send it back.

Thank you again for help, if anyone needs help, please priv. Greetings.