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Old 01-19-2005, 02:41 PM   #1
StopTech
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Default Current Draw on WRX at Rest

Can anybody please pull out their multimeter and check the current that their WRX draws while the car and all accessories are OFF?

I'm getting between 12 and 17 mA and I'm just trying to find out what the normal range is for our cars.

Thanks,
Tim Kelsch
StopTech LLC
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Old 01-19-2005, 04:53 PM   #2
JjSwee
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Sorry, this isnt a helpful post, because I do not own a WRX.
Edit: Measuring from battery to battery terminal. I thought you meant idle not off. Wrote a lot, until I figured that out.

Last edited by JjSwee; 01-19-2005 at 05:07 PM. Reason: Read twice, Respond once.
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Old 01-19-2005, 06:15 PM   #3
StopTech
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Shoot, I don't care if you own a 1994 Legacy Turbo, at this point I have almost no data to go from.

I had the multimeter in series between the male and female positive post terminals on the battery.
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Old 01-24-2005, 04:10 PM   #4
Bayley
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12 - 17 mA at rest ('Q-current' as the industry calls it) actually sounds pretty good. All the Honduh body control modules I've designed had a specific requirement of <2mA Q-current for each module. Since we had three modules in the car, the maximum spec'd current by Honduh was 6 mA. Again, this was for JUST the body controllers (i.e. door lock / power window / security / keyless entry / etc... module). It is my "guesstimate" that most OEM would want an overall Q-current of less than 20 mA to help promote long battery life.

Another item to consider, is when you are taking the measurements. Most modules will have multiple “sleep” (low power mode) shut down requirements. Sometimes the module will go to sleep as soon as the ignition is shut off, sometimes it might wait up to 10 minutes. Your best bet to measure Q-current is to hook up the Amp meter, cycle the ignition (without starting the car!!!) wait a good 10 minutes, then take your measurement.
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Old 01-24-2005, 04:18 PM   #5
Synx
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Haha ya, i think we need to make sure everyone understands DO NOT attempt to start the car with a DMM inline, w00t, can you say 400 CCA passing thru a DMM
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Old 01-24-2005, 04:42 PM   #6
Bayley
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Quote:
Originally Posted by Synx
...can you say 400 CCA passing thru a DMM
As a matter of fact, I can: Instant.. fourth... of... July...

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Old 01-24-2005, 06:12 PM   #7
StopTech
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Wow, thanks Bayley that was incredibly informative. I wish I knew that it was called Q Current instead of current draw when the car and all accessories are turned off.

Thanks again,
Tim Kelsch
StopTech LLC
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Old 01-24-2005, 07:10 PM   #8
Bayley
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Quote:
Originally Posted by StopTech
I wish I knew that it was called Q Current instead of current draw when the car and all accessories are turned off.
The "Q" stands for Quaiscent or something like that. Nobody could ever spell the word properly... yet alone pronounce it. Hence the term "Q-current".

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Old 01-24-2005, 10:51 PM   #9
Uncle Scotty
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It's quiescent


...and some of the 'worst' 'fireworks' I saw was a guy's wedding ring get between a battery terminal and the cable end..... Bad juju. Only 9 fingers left.
Beware.
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