SL/R230: Malfunction
Thread Starter
Junior Member
Joined: Apr 2006
Posts: 27
Likes: 0
From: North Carolina
2005 SL500
Malfunction
The convenience battery (in the trunk) of my 2005 SL500 is connected to a CTEK battery when parked in the garage. The starter battery (under the hood) is not connected.
Periodically, the SL500 displays a malfunction during which a) the hardtop cannot be raised or lowered and/or b) the cigarette lighter is similarly not operative. After driving for a period, the malfunction disappears and everything functions normally.
Has anyone else experienced this situation? Is the convenience battery due for replacement? I have replaced the starter battery once during my seventeen years / 11,000 miles of ownership.
Periodically, the SL500 displays a malfunction during which a) the hardtop cannot be raised or lowered and/or b) the cigarette lighter is similarly not operative. After driving for a period, the malfunction disappears and everything functions normally.
Has anyone else experienced this situation? Is the convenience battery due for replacement? I have replaced the starter battery once during my seventeen years / 11,000 miles of ownership.
Newbie
Joined: May 2021
Posts: 4
Likes: 0
04 SL500
Malfunction
I’ve had the same issues on my 04 SL500. Finally I had service call and AAA guy said the consumer battery was fully charged. I’m getting the consumer battery replacement tomorrow. At some point I don’t think the battery will hold the charge.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 1,232
Likes: 168
From: Glasgow, Scotland, UK
SL 350 R230 (3.7L with AMG Speedshift autobox)
Batteries are low, your voltage maybe okay but the current maybe weak, check your alternator is giving out 14.1 V.
Replace the battery with a genuine Mercedes battery or Varta, I did this and never had the issue again, I do not use a trickle charge as its not required, I can leave the car for a month and it will start right up .
Replace the battery with a genuine Mercedes battery or Varta, I did this and never had the issue again, I do not use a trickle charge as its not required, I can leave the car for a month and it will start right up .
Super Member
Joined: Sep 2019
Posts: 623
Likes: 213
From: My house
SL55AMG, GL450, SLK, S550, Maserati Coupe
It's almost unimaginable that a 2004 could still be using an original battery, that's what, 17 years?!
The battery you buy is your choice, of course. All the Mercedes I've put batteries in over the past several years, I've bought Duracell AGM batteries, and never had any trouble after that.
I just thought, who knows batteries better then Duracell? And the coppertop black and copper color looks good to me. Naturally they have a good warranty.
Obviously a Mercedes brand battery is going to perform perfectly as well. I wonder what the price difference is, if any.
The giant trunk batteries I've bought have ranged around $200-230 USD. Best of luck, to all!
The battery you buy is your choice, of course. All the Mercedes I've put batteries in over the past several years, I've bought Duracell AGM batteries, and never had any trouble after that.
I just thought, who knows batteries better then Duracell? And the coppertop black and copper color looks good to me. Naturally they have a good warranty.
Obviously a Mercedes brand battery is going to perform perfectly as well. I wonder what the price difference is, if any.
The giant trunk batteries I've bought have ranged around $200-230 USD. Best of luck, to all!
Last edited by tonylinc; May 20, 2021 at 06:37 PM.
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Super Member
Joined: Aug 2017
Posts: 520
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From: Scottsdale AZ
2015 SL550 & 2012 S550 4matic
Just replaced both my batteries which were 7 and 9 years old MB OEM with same from local dealer. Shopped all the parts stores for batteries and discovered that many were available and prices were within 10% of MB. In addition 1 stop not 2 as not all stores carried both in stock. I asked for a discount and MB parts gave me 10% off which helped.
starter $ 216 trunk $185 less core 22.50 ea. plus sales tax, $431.00 out the door. Ez diy.
starter $ 216 trunk $185 less core 22.50 ea. plus sales tax, $431.00 out the door. Ez diy.
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Junior Member
Joined: Dec 2009
Posts: 60
Likes: 4
SL500-R230
Periodically, the SL500 displays a malfunction during which a) the hardtop cannot be raised or lowered and/or b) the cigarette lighter is similarly not operative. After driving for a period, the malfunction disappears and everything functions normally.
Has anyone else experienced this situation? Is the convenience battery due for replacement? I have replaced the starter battery once during my seventeen years / 11,000 miles of ownership.
Has anyone else experienced this situation? Is the convenience battery due for replacement? I have replaced the starter battery once during my seventeen years / 11,000 miles of ownership.
What is the message on the malfunction if you arrow up
You could have a fault with K75, or N10/10 driver SAM but those do have a supply from the starter battery so you may be right
Last edited by m60kaf; May 23, 2021 at 07:22 PM.
