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Phillip H
Phillip H, Auto Mechanic
Category: Car
Satisfied Customers: 379
Experience:  Vehicle Technician at Richmond Motor Services
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We have discovered after 3 weeks of lockdown that the

Customer Question

We have discovered after 3 weeks of lockdown that the battery on my Korando was dead. After charging it up we discovered that something is drawing 3.4 amps when the car has had the door opened but the engine has not been started. I have recently had some parking sensors fitted by a local guy. Any ideas at all before I berate the parking sensor fitter?
JA: Did you test the battery with a voltmeter? And have you ever changed one before?
Customer: The battery is fine.
JA: What is the make/model/year of your car?
Customer: Ssangyong Korando 2016 2.3 SE
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: We've tried a few of the fuses under the bonnet but some of them we dare'nt try, we don't know enough about them. But the ones we did try told us nothing, they were all alright.
JA: Anything else you want the Mechanic to know before I connect you?
Customer: Is this 3.4 amp draw normal anyway. It doesn't seem good to me.
Submitted: 1 year ago.
Category: Car
Expert:  Phillip H replied 1 year ago.

Hiya

In all modern day vehicles there will be some degree of current draw for 'X' minutes after turning the engine off and locking the vehicle. This is due to the electronic modules which will still be running and communicating with each other. The modules all shut down at different rates and eventually enter into a sleep mode until such time that you unlock the vehicle again.

What the current draw should be on your vehicle while this is happening I couldn't tell you. This information maybe available via your local dealer.

Hope this helps

Regards

Phillip

Customer: replied 1 year ago.
Hi Phillip
It doesn't seem right that a modern cars battery will go flat in 3 weeks just sitting there. I will have to take it to a specialist to track down the "parasitic draw"
Thanks
Expert:  Phillip H replied 1 year ago.

Hiya

It shouldn't go flat in 3 weeks however the question you asked was if 3.5 Amp current draw was normal. The answer to that is yes if the modules haven't all gone into sleep mode at the time you were testing them.

I can't talk for Ssangyong however on a Nissan within an hour all of the modules should be asleep after locking the car. This in turn will make the current draw approx 0.1 amp if you allow for any alarm systems that have to have constant power to monitor the vehicle.

If this has only happened since you had these what I assume are aftermarket parking sensors fitted it is entirely possible that when they were fitted the power for this was taken from somewhere that is now preventing a vehicle module from shutting down.The only way to check this would be to disconnect the parking sensor module that has been fitted and see if that cures it.

When fitting accessories the only safe way to ensure that they won't cause an issue to the vehicle is by ensuring that they are approved by the Vehicle Manufacturer.

Regards

Phillip

Customer: replied 1 year ago.
Thanks Phillip. That sounds like the answer. we'll get the guy who fitted the sensors to check that.