You are here: Forums Wagons Mercedes-Benz R-Class Mercedes-Benz R-Class Maintenance & Repair Mercedes-Benz R-Class Electrical Problems

Mercedes-Benz R-Class Electrical Problems

23 messages,  Last post on Jan 15, 2009 at 4:46 AM

You are in the Mercedes-Benz R-Class Maintenance & Repair Forum. Your Host is kcram

What is this discussion about? Mercedes-Benz R-Class, Electrical, Wagon

Messages Page 3 of 3 1 2 3 Prev Next Last

Go To Msg # Search This Discussion

#17 of 23 Re: Now more then minor problems [ctdan] by lcjd Nov 18, 2008 (9:51 am)
Replying to: ctdan (Nov 18, 2008 7:27 am) MB replaced our steering control unit 7 months ago and ,knock on wood, it seems to have resolved our battery drain issue. Make sure the steering control unit is from a previous year, though. Not a 2008.   I agree, watching the flatbed tow our 2008 - 3 times!- was no fun! Replies to this message: ctdan (Nov 18, 2008 10:23 am)
#18 of 23 Re: Now more then minor problems [lcjd] by ctdan Nov 18, 2008 (10:23 am)
Replying to: lcjd (Nov 18, 2008 9:51 am) Thanks for the response lcjd.   Interesting, my dealer never mentioned a steering control unit as a potential problem. What he did tell me though when I my car was dropped off yesterday with this low voltage issue is that he had another R350 in the shop w/a similar problem.
#19 of 23 Low Voltage problem update by ctdan Nov 18, 2008 (1:59 pm)
Just had an update from my Svc Tech and he confirmed that they found the source of the problem and it is the ISM Motor of the Control Unit.   A quick google of "MB ISM Motor" revealed the exact same problem resulting in the “DRIVE DIRECTLY TO GARAGE WITHOUT CHANGING GEAR” message that I received.   They told me that basically what happened is that the ISM Motor is defective - this is the part that controls the paddle to shift from park to drive & reverse. The faulty ISM was preventing the car from shifting gears, hence the message above about driving without changing gears (a physical impossibility, but let's not split hairs). The drain came from the fact that problem with the ISM Motor prevented the car from recognizing that it was in park and therefore resulted in the repeated beeping and the dome light to be illuminated with no way to shut either off - causing the battery to drain.   He is replacing the ISM Motor tomorrow, hopefully that will do the trick. I'll post an update if it worked... or didn't.
#20 of 23 Sunroof glitches and other problems by diecastaussie Nov 23, 2008 (11:38 pm)
I'm from Australia and this is my first post - I have a 2006 R350 which I purchased 7 months ago from a Mercedes Benz dealer. It is a 6 seater with "touring pack" which means that it has the removable console in between the 2nd row seats. I love the car, it has a couple of very annoying electrical bugs - thankfully not the battery draining issues that I have read about elsewhere on this forum. Firstly the 1 touch auto close on the sunroof doesn't work. When I use this feature the roof almost closes the reverses to a half open position. If I touch the button again it will then close fully. It will also close fully if I hold the button or if I use the key fob from outside the vehicle. So far the dealer has replace the wind deflector and the control module but the fault persists, the dealer is now saying that the rails may be warped and wants to changeover the entire sunroof cassette. Anyone else experienced this problem? Secondly, the auto light switch appears to have a mind of its own, sometimes turning the headlights on in the middle of the day in bright sunlight or refusing to turn the lights on at dusk or in low light conditions such as very heavy rain. The dealer has replaced the optical sensor but the fault persists. Finally, the front parking sensors seem to go crazy on hot days often emitting continuous tone and full led signal for several minutes for no apparent reason. This only affects the righthand side of the vehicle. Dealer says he cannot duplicate the problem. I would very much appreciate any advice or information regarding these annoying faults which spoil an otherwise excellent vehicle.
#21 of 23 Dang was hoping that the 08's were better! by watkinst Dec 18, 2008 (11:36 am)
Looking at 08 Rclass CDI's - anyone with the CDI 08 experiencing these issues? Guessing its all the same stuff just a different engine
#22 of 23 Re: Lighting problems [james3686] by StarTraveler Jan 15, 2009 (12:38 am)
Replying to: james3686 (Nov 16, 2008 2:10 pm) Hi James, Did you ever find out what was going on with your tail lights? My R500 does the same thing. Also my horn has gone out. I'd feel silly if I took it in and someone tightened one screw and charged me $300. I'd love to know what was done to fix it.   Thanks! Don Replies to this message: james3686 (Jan 15, 2009 4:46 am)
#23 of 23 Re: Lighting problems [StarTraveler] by james3686 Jan 15, 2009 (4:46 am)
Replying to: StarTraveler (Jan 15, 2009 12:38 am) Don     Took the car to the local Benz dealer, they were kind enough to fix it free of charge, to me that's indication that they were having problems on many of the cars. If I understand the fix, it has something to do with the light socket making contact to the tail light housing, or lack of making contact. 50,000.00 miles seems to be the magic number, under that and they make a free fix. Spoke with another R350 owner that had the same problem with the tail lights. Can't help you with the horn problem. Hope this is of some help. Take care & travel safe

Messages Page 3 of 3 1 2 3 Prev Next Last

Go To Msg # Search This Discussion

You are here: Forums Wagons Mercedes-Benz R-Class Mercedes-Benz R-Class Maintenance & Repair Mercedes-Benz R-Class Electrical Problems