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Author Topic: Implications with disconnecting the battery.  (Read 4287 times)

Offline bgbazz

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Implications with disconnecting the battery.
« on: 10 May 2016, 14:10 »
I've carried various searches and don't seem to come up with a definative answer regarding disconnecting the battery for a short while. I just want to reset the ECU and anything else it affects...I've used this method on various other vehicles of mine, with no issues at all, but not too sure about the VW.

Does anyone really know?
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Mk4 Golf TDI Estate 4Motion, remapped 1.9. Sweet runner = keeper. She is the 66th vehicle I've owned and hopefully, the last.

Offline lemski

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Re: Implications with disconnecting the battery.
« Reply #1 on: 10 May 2016, 14:28 »
When doing clutches amd stuff battery is off for aslong as it takes. Last one I did, the satnav and all came back on fine. Ecu should reset after a hour... I think.
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Offline itavaltalainen

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Re: Implications with disconnecting the battery.
« Reply #2 on: 10 May 2016, 15:40 »
Won't really reset, for that use diagnostics.
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Offline bgbazz

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Re: Implications with disconnecting the battery.
« Reply #3 on: 10 May 2016, 16:02 »
Thanks guys. I think I'm going to give it a try anyway.

On a short drive today I stopped once and noticed the system didn't chirp when locking the car (central locking worked fine, but no chirp). When I came back and unlocked the car, all worked fine and it chirped. Ten minutes down the road, the airbag light came on, followed 5 mins later by the message "airbag fault" on the screen. I pulled over, switched the motor off and waited a couple of minutes before restarting and driving on...same thing happened after a few minutes so I drove home and hooked up my OBD reader. Performed a scan 3 times and the result was always the same...no faults found. I used the setting to turn the light off and that worked fine...but it comes back on after 5 mins or so while driving.

Got me stumped.  :undecided:
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Mk4 Golf TDI Estate 4Motion, remapped 1.9. Sweet runner = keeper. She is the 66th vehicle I've owned and hopefully, the last.

Offline itavaltalainen

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Re: Implications with disconnecting the battery.
« Reply #4 on: 10 May 2016, 16:43 »
What reader do you have? OBD2?
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2019 Seat Leon ST FR DSG 135kW - eclipse orange - 23k miles

Offline bgbazz

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Re: Implications with disconnecting the battery.
« Reply #5 on: 10 May 2016, 17:57 »
Yes I do, but I've just discovered that it can't read airbag faults, so I'm going to head down a different track tomorrow and see what I end up with.
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Mk4 Golf TDI Estate 4Motion, remapped 1.9. Sweet runner = keeper. She is the 66th vehicle I've owned and hopefully, the last.

Offline lemski

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Re: Implications with disconnecting the battery.
« Reply #6 on: 10 May 2016, 18:23 »
Itll more than likely be the seat connection on one of the front seats.
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Offline itavaltalainen

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Re: Implications with disconnecting the battery.
« Reply #7 on: 10 May 2016, 18:34 »
Yeah get VCDS - most useful tool for VWs.
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Offline bgbazz

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Re: Implications with disconnecting the battery.
« Reply #8 on: 10 May 2016, 20:18 »
Quote from: lemski on 10 May 2016, 18:23
Itll more than likely be the seat connection on one of the front seats.

Thanks mate...that is one of the things I'll be looking at in the morning.
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Mk4 Golf TDI Estate 4Motion, remapped 1.9. Sweet runner = keeper. She is the 66th vehicle I've owned and hopefully, the last.

Offline bgbazz

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Re: Implications with disconnecting the battery.
« Reply #9 on: 10 May 2016, 20:21 »
Quote from: itavaltalainen on 10 May 2016, 18:34
Yeah get VCDS - most useful tool for VWs.


You're probably right...I will see if I can find one and get it imported.
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Mk4 Golf TDI Estate 4Motion, remapped 1.9. Sweet runner = keeper. She is the 66th vehicle I've owned and hopefully, the last.
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