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Troubleshooting Parasitic Drain, 2006 Mazda3


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schmooot 
Member - Posts: 12
Member spacespace
Joined: February 26, 2008
Posted: September 28, 2021 at 6:51 PM / IP Logged Link to Post Post Reply Quote schmooot
Not sure where else to ask but here goes.
I've had this car in my shop for a week now and I've been tinkering with it a little bit here and there, trying not to spend too much time on it because the owner isn`t planning on paying an exorbitant amount for me to find the issue, but I'm stuck so Here's the details
It's a 2006 Mazda3, 2.3L. It is drawing 120ish mA while sitting. Enough to kill the battery in a couple days. Acceptable current draw should be 50ish according to my experience. I've narrowed it down to the door trigger circuit. I've attached the schematic. My ammeter is hooked up in series in place of the 40A BTN fuse
Here is the weird part, read carefully: The drain goes away when I open all the doors. I have the interior lights all off (except for the ignition light, door open light, and dim blue dash courtesy lights which come on when the driver`s door is opened, I have also accounted for these lamps being on in my calculation).
For example: 120mA draw with all doors closed, I open one door, now its 110, open another door, now its 90, open the 4th door and it goes down to 70mA...which I can get down to just above 50 if I disable the warning and courtesy lights
I`ve already removed all aftermarket accessories including a poorly installed alarm remote start unit which had isolation diodes on all the door triggers and resistors, a real hack job. I cut it all out and repaired the wires back to factory. So I feel I can confidently say the vehicles electrical is restored back to stock, even factory audio
Logically, the circuit should draw more amperage when I open doors...especially the drivers door.   According to the schematic, the bcm is seeing ground through the door triggers, when the door is opened it opens the circuit and cuts that ground off. I`m kinda stumped on what else to try. Any bright ideas from the community Troubleshooting Parasitic Drain, 2006 Mazda3 -- posted image.

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