x164 trailer wiring not working.
Thread Starter
Junior Member
Joined: Dec 2020
Posts: 15
Likes: 1
MB X164
x164 trailer wiring not working.
Car 2008, 320d, 4matic.
there is no power to the trailer. I have to state that electricity comes to one contact. This is the charging current. nothing for the trailer lights. I read the forum and found information where there may be water damage. I checked . yes SAM had gotten moisture. I detected it by opening SAM. there was about two square centimeters of white corrosion in the lower left corner. I removed it with microcircuit cleaner. plate clean and dry, I put it back together and mounted it back on the car. this well-known error where the water comes from under SAM, I also found it and removed it. as the rear light assembly seal ages, it deforms and lets water in. I installed a new gasket. things back in place and still no electricity. I live in a place where the Mercedes Star program is not available. a mechanic local scanned the SAM and we were able to enable and disable the trailer. we tried to test the relays but without results.
there is no power to the trailer. I have to state that electricity comes to one contact. This is the charging current. nothing for the trailer lights. I read the forum and found information where there may be water damage. I checked . yes SAM had gotten moisture. I detected it by opening SAM. there was about two square centimeters of white corrosion in the lower left corner. I removed it with microcircuit cleaner. plate clean and dry, I put it back together and mounted it back on the car. this well-known error where the water comes from under SAM, I also found it and removed it. as the rear light assembly seal ages, it deforms and lets water in. I installed a new gasket. things back in place and still no electricity. I live in a place where the Mercedes Star program is not available. a mechanic local scanned the SAM and we were able to enable and disable the trailer. we tried to test the relays but without results.
Member
Joined: Apr 2022
Posts: 136
Likes: 34
GL320 2007
I had a nightmare getting LED lights to work.
There is a lot going on with the sensors. But you should be able to get some power readings (noting that it will likely be sensor voltage, so changing). If you have no power on any, then you have a problem. Either fuses or SAM. Either way a scan tool should pick up the issue.
There is a lot going on with the sensors. But you should be able to get some power readings (noting that it will likely be sensor voltage, so changing). If you have no power on any, then you have a problem. Either fuses or SAM. Either way a scan tool should pick up the issue.
