C43 S205 DRL and indicator issue

[DamoC43]

Hi all, So there are quite a few posts about DRL issues but none of them seem to draw a conclusion. I will make sure that this one does - assuming i solve it of course!

Car is C43 S205 2019 plate
Head lighs are multibeam part no: A2059069505

So fault is i was driving when error messages popped up on dash - Side light, turn signal, parking light malfunction. When i stopped to check the DRL on passenger side was flickering and the indicator was not working. Inside the car the indicator switching was super fast - indicator on side mirror and rear cluster passenger side woking fine. Drivers side everything working as normal. Headlight had a bit of condensation so i left some silica packs in over night. This morning on first start DRL was running fine but as soon as i put on left hand indicator the fast switching ensued and so did the flickering DRL or it stopped all together. I discovered the module for DRL's is the smallest one of the 3 on each headlight assembly and i happened to have a spare from the original headlight i replaced some time back so i switched them over this morning but no joy. The rest of the passenger headlight functions fine though (Low / High beam).
I've checked for a signal at the plug - apparently i should be able to detect a 0 to 12v alternating signal on one of the plug wires using multi meter but I can't detect one. Have confirmed 12v supply is there. I also tried plugging the old headlight back in after i'd switched the modules over but still nothing however that headlight had the 2 main modules missing so doubt that was a fair test.
So my question really is:
A) Should i be able to detected an alternating voltage at the main headlight plug with indicators switched on - using a multi meter? I've already confirmed i have a good ground and 12v supply. I can verify this myself tomorrow by testing on the drivers side.
B) Can i also trace the same wire back to SAM module (assuming above point is valid) and check there too. Current assumption is that it's a SAM related fault. I'm also struggling to work out if the SAM module is up near the battery or is in the cabin on passenger side?

I've also scanned and picked up a bunch of faults mostly comms related errors B162A64, B16EF64, U118A08, U118A67.

Any advice much appreciated. PS: I like to try and solve such issues myself so please don't suggest i take it to a garage - i will if i can't solve but i'm not giving in just yet.
Any additional info required please let me know

 

[DamoC43]

Hi all, So there are quite a few posts about DRL issues but none of them seem to draw a conclusion. I will make sure that this one does - assuming i solve it of course!

Car is C43 S205 2019 plate
Head lighs are multibeam part no: A2059069505

So fault is i was driving when error messages popped up on dash - Side light, turn signal, parking light malfunction. When i stopped to check the DRL on passenger side was flickering and the indicator was not working. Inside the car the indicator switching was super fast - indicator on side mirror and rear cluster passenger side woking fine. Drivers side everything working as normal. Headlight had a bit of condensation so i left some silica packs in over night. This morning on first start DRL was running fine but as soon as i put on left hand indicator the fast switching ensued and so did the flickering DRL or it stopped all together. I discovered the module for DRL's is the smallest one of the 3 on each headlight assembly and i happened to have a spare from the original headlight i replaced some time back so i switched them over this morning but no joy. The rest of the passenger headlight functions fine though (Low / High beam).
I've checked for a signal at the plug - apparently i should be able to detect a 0 to 12v alternating signal on one of the plug wires using multi meter but I can't detect one. Have confirmed 12v supply is there. I also tried plugging the old headlight back in after i'd switched the modules over but still nothing however that headlight had the 2 main modules missing so doubt that was a fair test.
So my question really is:
A) Should i be able to detected an alternating voltage at the main headlight plug with indicators switched on - using a multi meter? I've already confirmed i have a good ground and 12v supply. I can verify this myself tomorrow by testing on the drivers side.
B) Can i also trace the same wire back to SAM module (assuming above point is valid) and check there too. Current assumption is that it's a SAM related fault. I'm also struggling to work out if the SAM module is up near the battery or is in the cabin on passenger side?

I've also scanned and picked up a bunch of faults mostly comms related errors B162A64, B16EF64, U118A08, U118A67.

Any advice much appreciated. PS: I like to try and solve such issues myself so please don't suggest i take it to a garage - i will if i can't solve but i'm not giving in just yet.
Any additional info required please let me know

Ok i can update - answer to both my questions above is No.
Whats really odd is i've turned on ignition and side lights this morning (Without engine start) and both DRL's are running fine. I then turned on hazard lights and they're both flashing away fine. I tried to look for an alternating signal on both headlight plugs with hazards still on and couldn't detect anything. What i did find is on drivers side 1 particular pin is at 2.7v, the same pin on the passenger side has 11.8v? Other than that i've not found anything. I'm pretty sure that as soon as i drive the car and try and make a left turn i'll get the fault back and a flickering DRL so perhaps the fault resets after a certain amount of time suggesting a bad communication between SAM and DRL / Turn signal module?
So i'm at a bit of a loss as to what to check next. I'd wanted to try and read some live data in scan tool but there isn't an option for live data within the Front divers side SAM option. There are live data feeds for other options related to front left light and front left LED matrix but they just tell me there's voltage there (Which i already knew from using multi meter). Going to have another scan today and see if there's data under a different heading, perhaps Body Control Module?
Anyone got ay other suggestions about what to check then i'm all ears. Is there anything i could check at the SAM module for instance?
Many thanks

 

[DamoC43]

Ok i can update - answer to both my questions above is No.
Whats really odd is i've turned on ignition and side lights this morning (Without engine start) and both DRL's are running fine. I then turned on hazard lights and they're both flashing away fine. I tried to look for an alternating signal on both headlight plugs with hazards still on and couldn't detect anything. What i did find is on drivers side 1 particular pin is at 2.7v, the same pin on the passenger side has 11.8v? Other than that i've not found anything. I'm pretty sure that as soon as i drive the car and try and make a left turn i'll get the fault back and a flickering DRL so perhaps the fault resets after a certain amount of time suggesting a bad communication between SAM and DRL / Turn signal module?
So i'm at a bit of a loss as to what to check next. I'd wanted to try and read some live data in scan tool but there isn't an option for live data within the Front divers side SAM option. There are live data feeds for other options related to front left light and front left LED matrix but they just tell me there's voltage there (Which i already knew from using multi meter). Going to have another scan today and see if there's data under a different heading, perhaps Body Control Module?
Anyone got ay other suggestions about what to check then i'm all ears. Is there anything i could check at the SAM module for instance?
Many thanks

Fault did come back after driving. Next plan is to swap modules with drivers side which means bumper off - sigh!

 

[Diesel Benz]

You should use a wiring diagram when measuring pins from the front light connector (pe82.10-p-2000-97fbc I believe, usually google finds these but I did not have any luck).

You could name the wire colours for your measurements or the connector pin number. I'm afraid there is no individual on/off wire from the SAM but all CAN controlled (assuming 641 lights, vehicle VIN would be useful).

 

[DamoC43]

T

You should use a wiring diagram when measuring pins from the front light connector (pe82.10-p-2000-97fbc I believe, usually google finds these but I did not have any luck).

You could name the wire colours for your measurements or the connector pin number. I'm afraid there is no individual on/off wire from the SAM but all CAN controlled (assuming 641 lights, vehicle VIN would be useful).

Thanks for reply, Is that code in brackets a diagram ref? I've never had much look finding circuit diagrams online either

I've attached a pic of the passenger side plug (Sorry it's rotated 90 deg). If I number them starting top left going straight down

Left hand side of pic
1 = 0v
2 = 11.8v
3 = Ground
4 = 12v
5 = 12v
6 - blank
7 - blank
Right hand side of pic
8 - Top right = 0v
9 = 0v
10 - blank
11 - blank
12 = 0v
13 - blank
14 - blank

On the drivers side plug it's identical except

Top left
1 = 2.7v
2 = 0

When the car has been off all night the DRL's do work again with only ignition on but i've not had the chance yet to get a reading off the plugs while it's in that state. As soon as it's driven or indicator is used the fault returns and after a while the passenger DRL shuts off all together - sometimes - or just stays in a flickering state. These readings were obtained while the DRL had shut down altogether on passenger side, so I might get slightly different results when its powered on. I'm away with work this week so can't repeat this check until at least Saturday.

VIN for vehicle is WDD2052642F896389 if that helps anyone source a wiring diagram.

 

[Diesel Benz]

Your pin numbering makes me confused as it does not follow the numbering that should be printed on the connector. Should not matter but I probably missed something when reading your data.

I assume you get odd measurements from CAN wires, the circuit 30 seemed OK but one of the 30L was zero instead of 12. Don't know if it is because of load protection by the SAM. There is no dedicated wire for the indicator, nor other lights. Just ground wires, CAN, C30 and C30L.