Jun 10, 2015, 11:38 AM
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Easiest way to reset my ECU
Thread Starter
Senior Member
Joined: Dec 2009
Posts: 338
Likes: 1
From: Melbourne, Australia
2011 Ultima GTR
Yazid - Hmmm, unsure now really. I think the best bet is the battery in the boot. Seriously, it takes 30 seconds to do. Can just do it at night when parking and in the morning when leaving.
MBWorld Fanatic!
Joined: Apr 2009
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2009 c63, 2010 E63
Thread Starter
Senior Member
Joined: Dec 2009
Posts: 338
Likes: 1
From: Melbourne, Australia
2011 Ultima GTR
settings like which?
and no, didn't/don't lose anything. all the settings on my command are pre-programmed (radio stations etc) and the time is taken from the GPS I think (at least, I've never set it or had to set it)
and no, didn't/don't lose anything. all the settings on my command are pre-programmed (radio stations etc) and the time is taken from the GPS I think (at least, I've never set it or had to set it)
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Joined: Apr 2010
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2017 Mini Cooper S Clubman ALL4 - British Racing Green
The ECU utilizes non volatile ram (nvram), which is memory that maintains it's state whether or not there is any power supplied. Supplemental controls/instructions are stored elsewhere, probably in the supporting components for the ECU. Odds are they also use nvram.
So, the answer, if you disconnect the battery, you should not lose anything that involves the ECU. The radio on the other hand, since it is WINCE based (Windows CE.. like the old pocket pc's and such), probably stores its settings on the hard drive, or built in flash memory (likely the latter due to the speed with which the radio turns on, hard drives would take longer).
So, the answer, if you disconnect the battery, you should not lose anything that involves the ECU. The radio on the other hand, since it is WINCE based (Windows CE.. like the old pocket pc's and such), probably stores its settings on the hard drive, or built in flash memory (likely the latter due to the speed with which the radio turns on, hard drives would take longer).
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MBWorld Fanatic!
Joined: May 2008
Posts: 1,601
Likes: 14
From: dfw
'10 C63
i'd like to try this reset but don't want to lose radio/sat settings, and seat, mirror settings. from what i've read so far, it seems the radio stuff will stay but not sure about the seats and mirrors.
i've never even seen the battery in the trunk, but is it really that easy to disconnect? no tools required or something?
and you're supposed to unplug only the neg(-) right?
i've never even seen the battery in the trunk, but is it really that easy to disconnect? no tools required or something?
and you're supposed to unplug only the neg(-) right?
MBWorld Fanatic!
Joined: Feb 2010
Posts: 5,649
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2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)
i'd like to try this reset but don't want to lose radio/sat settings, and seat, mirror settings. from what i've read so far, it seems the radio stuff will stay but not sure about the seats and mirrors.
i've never even seen the battery in the trunk, but is it really that easy to disconnect? no tools required or something?
and you're supposed to unplug only the neg(-) right?
i've never even seen the battery in the trunk, but is it really that easy to disconnect? no tools required or something?
and you're supposed to unplug only the neg(-) right?
Super Member
Joined: Feb 2010
Posts: 603
Likes: 2
From: Houston Exburb-Richmond TX
2014 CLS 550 & 2004 CL55
I use this to quick disconnect and reconnect the battery on my Navigator for a chronic power liftgate reset issue.
http://www.amazon.com/Moroso-74103-B.../dp/B000COO1P4
It might work for this application if you feel the need to actually disconnect the battery with any regularity.
http://www.amazon.com/Moroso-74103-B.../dp/B000COO1P4
It might work for this application if you feel the need to actually disconnect the battery with any regularity.
Super Member
Joined: May 2011
Posts: 883
Likes: 72
From: Vancouver
2018 e63s edition 1
Hey fellow Aussie. The procedure to reset the ECU is as follows;
1. Turn the igniiton key to the "on" position which is just before you crank the engine to start.
2. Press the accelerator to the floor and hold for 5 seconds.
3. Then turn the key to the off position but do not remove the key, then release the accelerator.
4. Wait at least 2 minutes, the ECU is then reset.
5. ECU is now reset and you are ready to get new rear tyres.
The ECU rest procedure only erases the adaptive transmission and throttle settings. It does not erase any of the fuel, timing or other programming.
1. Turn the igniiton key to the "on" position which is just before you crank the engine to start.
2. Press the accelerator to the floor and hold for 5 seconds.
3. Then turn the key to the off position but do not remove the key, then release the accelerator.
4. Wait at least 2 minutes, the ECU is then reset.
5. ECU is now reset and you are ready to get new rear tyres.
The ECU rest procedure only erases the adaptive transmission and throttle settings. It does not erase any of the fuel, timing or other programming.
Last edited by ShaneN.; Jun 20, 2015 at 06:27 AM.
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2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)
After you've turned the key to the off position and then let off the accelerator, do you have to wait 2 minutes with the key left in the off position? I tried this last night and it didn't work but after I got to the end of step 3 i pulled the key out and left the car so that when I came back it was reset, and it wasn't.
