Wiring ? for trailer MB Hitch
Thread Starter
Member
Joined: Jun 2006
Posts: 120
Likes: 0
From: Los Angeles, CA
'07 GL450
Wiring ? for trailer MB Hitch
I just had my dealer install the OEM Trailer Hitch. They upgraded the rear SAM and installed a Pollak 7-way RV connector.
It seems that the connections are always live, which leaves my trailer lights on all the time (even with ignition off and alarm armed). The turn signals also, remain "on" all the time. Anyone experience this problem. Could it be a programming issue? I was thinking that the new rear SAM needs to be programmed to recognize the various signals. Please help. Thanks in advance.
Regards,
Mel
It seems that the connections are always live, which leaves my trailer lights on all the time (even with ignition off and alarm armed). The turn signals also, remain "on" all the time. Anyone experience this problem. Could it be a programming issue? I was thinking that the new rear SAM needs to be programmed to recognize the various signals. Please help. Thanks in advance.
Regards,
Mel
Senior Member
Joined: Dec 2006
Posts: 405
Likes: 1
From: Scottsdale, AZ
2007 GL320 CDI, 2001 TJ Rockcrawler, 2005 Scoobie STI
If you unplug the harness, do the turn signals still remain live on the GL?
I can understand the brakes being live with the ignition off, but the turn signals probably shouldnt function with the ignition off. Perhaps they tapped into an unswitched source for the power for the signals when they should have tapped into a switched source.
I don't have my GL yet... (April 26 build date). But I ordered the hitch receiver from the factory. I will be wiring up a trailer brake controller to the GL shortly after, so if I spot anything funky I will reply back here.
I can understand the brakes being live with the ignition off, but the turn signals probably shouldnt function with the ignition off. Perhaps they tapped into an unswitched source for the power for the signals when they should have tapped into a switched source.
I don't have my GL yet... (April 26 build date). But I ordered the hitch receiver from the factory. I will be wiring up a trailer brake controller to the GL shortly after, so if I spot anything funky I will reply back here.
Thread Starter
Member
Joined: Jun 2006
Posts: 120
Likes: 0
From: Los Angeles, CA
'07 GL450
If you unplug the harness, do the turn signals still remain live on the GL?
I can understand the brakes being live with the ignition off, but the turn signals probably shouldnt function with the ignition off. Perhaps they tapped into an unswitched source for the power for the signals when they should have tapped into a switched source.
I can understand the brakes being live with the ignition off, but the turn signals probably shouldnt function with the ignition off. Perhaps they tapped into an unswitched source for the power for the signals when they should have tapped into a switched source.
Regards,
Mel
MBWorld Fanatic!
Joined: Aug 2003
Posts: 5,517
Likes: 20
From: Las Vegas, NV
2011 E350 Cabriolet..White and Almond Mocha
If you unplug the harness, do the turn signals still remain live on the GL?
I can understand the brakes being live with the ignition off, but the turn signals probably shouldnt function with the ignition off. Perhaps they tapped into an unswitched source for the power for the signals when they should have tapped into a switched source.
I don't have my GL yet... (April 26 build date). But I ordered the hitch receiver from the factory. I will be wiring up a trailer brake controller to the GL shortly after, so if I spot anything funky I will reply back here.
I can understand the brakes being live with the ignition off, but the turn signals probably shouldnt function with the ignition off. Perhaps they tapped into an unswitched source for the power for the signals when they should have tapped into a switched source.
I don't have my GL yet... (April 26 build date). But I ordered the hitch receiver from the factory. I will be wiring up a trailer brake controller to the GL shortly after, so if I spot anything funky I will reply back here.
Senior Member
Joined: Dec 2006
Posts: 405
Likes: 1
From: Scottsdale, AZ
2007 GL320 CDI, 2001 TJ Rockcrawler, 2005 Scoobie STI
The one thing that I have going for me... Arizona is on the way to their Los Angeles preping facility. So the truck heading my way may fill up faster than the one going to Denver...
MBWorld Fanatic!
Joined: Aug 2003
Posts: 5,517
Likes: 20
From: Las Vegas, NV
2011 E350 Cabriolet..White and Almond Mocha
NJ, I think that we had identified that we had the same build date a little while back... Its a race to see if they get to North Scottsdale first, or Denver first.
The one thing that I have going for me... Arizona is on the way to their Los Angeles preping facility. So the truck heading my way may fill up faster than the one going to Denver...
The one thing that I have going for me... Arizona is on the way to their Los Angeles preping facility. So the truck heading my way may fill up faster than the one going to Denver...
The race is on....
Trending Topics
Thread Starter
Member
Joined: Jun 2006
Posts: 120
Likes: 0
From: Los Angeles, CA
'07 GL450
It seems that my dealer had to replace a defective SAM unit. They programmed the reverse/tilt mirror feature and reprogrammed the new SAM to make the trailer lights work correctly.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Senior Member
Joined: Dec 2006
Posts: 405
Likes: 1
From: Scottsdale, AZ
2007 GL320 CDI, 2001 TJ Rockcrawler, 2005 Scoobie STI
Good to hear they were able to fix the problem... Hopefully my experience with wiring up the GL and installing the Trailer Brake Controller will be a smooth one.
