newbizie

Hey guys I am trying to see if anyone has had or heard of any electrical short problems, I have a 08 GL 450, that lately ONLY when it rains I get all kinds of error messages. It first started out as saying my trailer lights where out and my brake lights were out but I had no trailer connected, so assuming it was a common hitch connector issue I checked and rewrapped the connector but it was dry anyway. When this would happen my brake lights on the truck would stay on weather I was depressing the brake pedal or not. As soon as the rain stops and everything dries we are back to normal everything works fine! Yesterday with a torrential down pour I started the truck (havn't driven anywhere yet) and again brake lights not working but now I get all kinds of SRS messages along with my horn slightly beeping my gas hand doesn't work and my wipers quit working talk about a fun time but now today everything has dried and working as normal except for my gas guage? Any one have any recommendations as to a gremlin I checked around for water in places where it isnt supposed to be with no luck.

Plutoe

Sounds like you have issues with one or both of the SAM's. The bad news is that you need factory or equal diagnostic software to corroborate my WAG as you can DIY your **** off and still not solve the problem!!

alx

your rear sam (connector) is getting water. you need to check for wetness and leaks.

the sam is located passenger side rear near the fuse block

newbizie

Yep found the cotton material was soaking wet it has mostly dried but i think it may have permanitly damaged the sam because my rear hatch constantly says its open and my battery just died because something will not turn off i dont know exactly what yet but i can hear a slight buzz when i enter the truck

alx

Your rear hatch lock might need to adjusted. They become misaligned with time and might not be rain related. If the hatch is ajar it will drain battery. When it buzzes try to push firmly with both hands hatch down and see if buzzing stops.

However, first you need to blow compressed air in the plug and connector of the Sam. There is water in there. If drying everything doesn't help then adjust hatch.

And goes without saying- find the leak.