[cristi.falan]

Hello,

I have a 2011 A160 petrol with CVT which after was parked does not want to start anymore. When I turn the key there is no sound from the starter and on the instrument panel are missing the informations about the gearbox lever position. I've read the errors and there is no communication with the TCU. There were no errors before this and the car was running fine. I've checked the fuses near the battery and all are OK, but i see that there is no voltage on the fuses F26 and F27 after i turn the key. Could this be the problem? Does anyone knows if the TCU is powered from a relay on the SAM or have a wiring diagram for the CVT ?

 

[MB•David]

Hi,

Here's a link to a CVT files I have - it's too big to upload here (69 files), so I put it on WeTransfer - they only keep uploads for 7 days though:

169 245 CVT.zip

1 file sent via WeTransfer, the simplest way to send your files around the world

we.tl

Also check Forrera's YT channel: https://www.youtube.com/user/forrera168/videos - everything and anything about A- and B-class from the top expert on the subject, including CVT problems, etc.

 

[MB•David]

This video in particular could be relevant:

 

[cristi.falan]

Thank you David,

A lot of interesting things in your documentation, I've found someting inside, but a wiring diagram is what I need. Now I know that the TCU receive 2 inputs one on circuit 31 and one on 87 but which is each and from where, is unknown to me.
I've looked at the videos too, but nothing helpful.

 

[MB•David]

What is your car's Baumuster - the first six digits of the VIN?

 

[cristi.falan]

What is your car's Baumuster - the first six digits of the VIN?

WDD169031

I've found that between the F26 F27 and + battery I have 12V which means there is a shortcircuit to the ground somwhere. I didn't have time to check more but in the next days I will try to separate the cables to restrain the area where to look for.

 

[MB•David]

Pulled these for you, some are year-specific, so only posting facelift ones:

 

[forrera]

Hello,

I have a 2011 A160 petrol with CVT which after was parked does not want to start anymore. When I turn the key there is no sound from the starter and on the instrument panel are missing the informations about the gearbox lever position. I've read the errors and there is no communication with the TCU. There were no errors before this and the car was running fine. I've checked the fuses near the battery and all are OK, but i see that there is no voltage on the fuses F26 and F27 after i turn the key. Could this be the problem? Does anyone knows if the TCU is powered from a relay on the SAM or have a wiring diagram for the CVT ?

Yes, one of the relays behind the glove box has something to do with transmission, starting and brake fluid level warning sign.

 

[cristi.falan]

Yes, one of the relays behind the glove box has something to do with transmission, starting and brake fluid level warning sign.

Hello,

Problem solved.
It was the relay N that powers the transmission and you are right, it was the brake fluid warning too.

Thank you both for your precious help.