Have 2008 ML500 which suddenly developed multiple electronic problems. Initially SRS light came on with no wipers, fuel gauge, indicators or keyless go and all rear lights permanently on. Disconnected battery and reset and SRS light has gone out, wipers and indicators work and rear lights back to normal. However, keyless go not working, neither is fuel gauge and when any door is opened the tailgate opens.

Anyone experienced similar? PS battery is only 2 years old.

 

These are all the symptoms of a failing rear SAM. There are hundreds of posts in the forum, so search "Rear SAM" and you'll soon find the answer you're seeking