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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Reverse and taillight stays on??
Hi guys I am getting fed up ,fix one problem discover another this is the latest.
I turned off the car today but for some reason the reverse and one of the tail light stays on .Anyone know what can cause this ?
They stay on even with the key removed .
Thanks
Erick
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: Reverse and taillight stays on??
Not positive but a start.
If I correctly remember my like issues, two things come to mind, low battery charge, effecting the SAM/security or a leak thru the rubber antenna over the windshield, also effecting the SOS/tele-aid/security, in the overhead console. Two simple checks without too much effort. |
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Re: Reverse and taillight stays on??
No its geting worst. All rear light are on with engine off and the key remote and blinkers does not work
Any idea guys?
Thanks
Erick |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: Reverse and taillight stays on??
http://www.benzworld.org/forums/g-class/2503209-new-me-g500-lots-so...
You need to check for water entry or the battery charge?
Have you experienced lots of rain and is the truck parked outside? |
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| RE: Reverse and taillight stays on??
thanks for the link I think this is my problem
are these SAMS easy to remove? |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: Reverse and taillight stays on??
Can't say, never had to do it. But I did find water leaking into the overhead console, via the rubber roof antenna.
Open the area where the CD changer is mounted and see if it's wet. |
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Re: Reverse and taillight stays on??
all bone dry , I did just restproof the area where the CD used to be . but I think it all started when I boosted the car |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: Reverse and taillight stays on??
What is boosted? |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| Re: Reverse and taillight stays on??
NHDave - 10/1/2016 11:20 PM
What is boosted?
Jump started? |
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Re: Reverse and taillight stays on??
Haha haha. Boosted is jump started in Quebec |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| RE: Reverse and taillight stays on??
Many other MB models that use the SAM architecture have known issues with the SAMs being damaged from a jump start. It sounds to me like your G may be in the same boat. |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| RE: Reverse and taillight stays on??
Floobydust - 10/2/2016 11:34 AM Many other MB models that use the SAM architecture have known issues with the SAMs being damaged from a jump start. It sounds to me like your G may be in the same boat. Floobydust Even when booted correctly, one could damage the SAM's or is it only if polarity was reversed? Could this happen to our trucks by jump starting another car? |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| RE: Reverse and taillight stays on??
The information came from my Indie at the time who said it can be a problem on several different chassis types. The only one I remember specifically is the ML because I had one then. He said that even a correct polarity jump can damage the SAMs and recommended that for my ML that I use a trickle charger to bring up the battery voltage slowly before jumping if I ever had a completely dead battery. Fortunately I never had to test that theory with the ML. |
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Re: Reverse and taillight stays on??
I opened up the Sam and it has a burt chip
Got a new one on order
Thanks guys |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| RE: Reverse and taillight stays on??
Floobydust - 10/3/2016 3:07 PM The information came from my Indie at the time who said it can be a problem on several different chassis types. The only one I remember specifically is the ML because I had one then. He said that even a correct polarity jump can damage the SAMs and recommended that for my ML that I use a trickle charger to bring up the battery voltage slowly before jumping if I ever had a completely dead battery. Fortunately I never had to test that theory with the ML. Thank you for the clarification FD. The OP seems to have a burnt SAM. Would like to know how though. We've all known reversing polarity could cause an explosion, "from our first early days of jumping any car". I'm guessing any handyman knows this fact! I'm still puzzled how easily this could happen with a simple jump, even if done properly. A trickle charge is best but not when your caught away from home. Triple A will not show up with a trickle charger, so what can we do to prevent this? Even if we carry a jump pack, could this burn the SAM. Should we use some sort of resistance, inline to prevent a surge? Sorry for the multi Q's |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: Reverse and taillight stays on??
Ertech - 10/3/2016 4:56 PM I opened up the Sam and it has a burt chip Got a new one on order Thanks guys Front or rear SAM? |
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| Re: Reverse and taillight stays on??
I'm not sure what the damage mechanism is. I've always speculated that jumping causes some sort of voltage spike that propagates through the electrical system. In the old days, MB used a centralized electrical protection scheme (the OVP or Over Voltage Protection Relay). This was a robust affair with fuses and a massive Zener diode that could protect the various system modules (there weren't many then) against just about anything including a reverse polarity jump. But as the number of modules proliferated, MB had to go to a module based protection system and unfortunately this is not as robust so modules can succumb to electrical disturbances easier. I suspect that the less robust module protective devices (smaller Zener diodes, integrated circuit regulators, etc.) can't handle large excursions and so burn out. It's like the old saying, "the transistor will always blow to protect the fuse".
As for what to do to prevent it if I'm stuck away from home- I'm not sure. I think I would first try jumping battery to battery with the jump vehicle not running and the key out of the ignition in the MB. This would limit the system voltage to ~12.6 volts instead of the up to 14.6 volts of a running vehicle. I'd make the connection and let it stand (and equilibrate) for about 10 or 15 minutes first before attempting a start. But this is all speculation on my part. I have been lucky and never had to jump any of my SAM equipped vehicles.
Edited by Floobydust 10/3/2016 9:00 PM
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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| Re: Reverse and taillight stays on??
I not sure for a G SAM, but on many models new SAM modules require "coding" with the SDS system to function correctly. I hope it is plug and play on the G. |
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Re: Reverse and taillight stays on??
what I think happened is:
was jumpstarting to fast did not let the car get a good charge and the car did not start right away .hope this is clear
btw it was the rear SAM |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: Reverse and taillight stays on??
Thank you FD for all your input here. All that info isn't hard to understand, seems these MB SAM vehicles have evolved so fast, leaving most weekend FIY peeps paying dearly for doing nothing out of the ordinary.
It's a shame, $900 per SAM replacement.
Ertech pays forward for doing nothing wrong.
Keep us posted Ertech? |
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