w221 s65 dead battery electronics help pls
06-23-2017, 04:02 AM
#1
w221 s65 dead battery electronics help pls
I disconnected starter battery and left car for two months.
Came back after two months and car dead. I put charger on the special postive post in engine compartment next to the starter battery and negative post of starter battery. After few hours the car started.
problem is when key remove none of the electronics work, can't lock door with remote and even interior light does not come on. Also seat massage function doesnt come on which tells me the consumer battery is low on power.
But the car starts and runs fine. Just when not running it has no electric power.
I tried charging consumer battery directly in the rear. No change.
Am i correct to assume the consumer battery is dead and needs to be replace?
Came back after two months and car dead. I put charger on the special postive post in engine compartment next to the starter battery and negative post of starter battery. After few hours the car started.
problem is when key remove none of the electronics work, can't lock door with remote and even interior light does not come on. Also seat massage function doesnt come on which tells me the consumer battery is low on power.
But the car starts and runs fine. Just when not running it has no electric power.
I tried charging consumer battery directly in the rear. No change.
Am i correct to assume the consumer battery is dead and needs to be replace?
06-23-2017, 09:58 AM
#2
I disconnected starter battery and left car for two months.
Came back after two months and car dead. I put charger on the special postive post in engine compartment next to the starter battery and negative post of starter battery. After few hours the car started.
problem is when key remove none of the electronics work, can't lock door with remote and even interior light does not come on. Also seat massage function doesnt come on which tells me the consumer battery is low on power.
But the car starts and runs fine. Just when not running it has no electric power.
I tried charging consumer battery directly in the rear. No change.
Am i correct to assume the consumer battery is dead and needs to be replace?
Came back after two months and car dead. I put charger on the special postive post in engine compartment next to the starter battery and negative post of starter battery. After few hours the car started.
problem is when key remove none of the electronics work, can't lock door with remote and even interior light does not come on. Also seat massage function doesnt come on which tells me the consumer battery is low on power.
But the car starts and runs fine. Just when not running it has no electric power.
I tried charging consumer battery directly in the rear. No change.
Am i correct to assume the consumer battery is dead and needs to be replace?
Johan
06-23-2017, 10:16 AM
#3
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W221
I disconnected starter battery and left car for two months.
Came back after two months and car dead. I put charger on the special postive post in engine compartment next to the starter battery and negative post of starter battery. After few hours the car started.
problem is when key remove none of the electronics work, can't lock door with remote and even interior light does not come on. Also seat massage function doesnt come on which tells me the consumer battery is low on power.
But the car starts and runs fine. Just when not running it has no electric power.
I tried charging consumer battery directly in the rear. No change.
Am i correct to assume the consumer battery is dead and needs to be replace?
Came back after two months and car dead. I put charger on the special postive post in engine compartment next to the starter battery and negative post of starter battery. After few hours the car started.
problem is when key remove none of the electronics work, can't lock door with remote and even interior light does not come on. Also seat massage function doesnt come on which tells me the consumer battery is low on power.
But the car starts and runs fine. Just when not running it has no electric power.
I tried charging consumer battery directly in the rear. No change.
Am i correct to assume the consumer battery is dead and needs to be replace?
06-23-2017, 10:06 PM
#5
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Join Date: Apr 2016
Location: Colorado
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2004 W240 Maybach 57
In cars with two batteries, I believe the disconnect procedure is Consumer battery negative terminal first, then Starter battery negative terminal second. So, if you disconnected your Starter battery out of sequence, you may have fouled up the Consumer side controllers/computers. Lets hope not. ALSO, batteries can be tested for health (ability to hold charge), so I would not replace a battery without having it checked out first.
07-05-2017, 03:36 AM
#6
MBWorld Fanatic!
Did you charge the rear consumer battery with an appropriate AGM-aware charger? If the battery has drained, it may take a few charges overnight to get the battery to maximum capacity. What kind of charger did you use, and what did the charger indicate the voltage values and capacity values were?
07-05-2017, 03:54 AM
#7
initially i used a cheap $22 dollar black and decker charger i bought on amazon. i think it was defective.
Then i used a ctek charger and everything came back on properly. so consumer battery is still good, did not have to change it.
Then i used a ctek charger and everything came back on properly. so consumer battery is still good, did not have to change it.
