SOLVED 04 XC90 another parasitic draw

2686 Views 32 Replies 8 Participants Last post by ORBrickDude, Oct 13, 2021

Dust101496

Discussion Starter · Sep 20, 2021

Hang on here with me,, sorry for the long post... Hey guys, kinda new here so please be lenient. I work mostly on German and American cars. This is my second xc90, first was a 2011, current is a 2004 T6. Long story short, when I got the car it needed the CEM repaired due to water damage. Got it done through xemodex. Car started and ran great with a new battery but has srs, brake assist, anti skid and bulb failure messages on dash. Also occasionally has security alarm system message. Driver door window and mirror doesn't work, also won't unlock unless you use the key in the door. Driverside rear door doesn't lock/unlock at all unless inside using the little knob on top. Idk if my DDM is bad or if it's electrical issues causing my multiple driver side door issues. Any advice? But the MAIN ISSUE is I parked it over the weekend and now my battery is dead. When I put the key into the ignition the rear cargo relay RMA3 (for my rear window defroster) clicks like crazy and the power in the entire car flickers and then just dies. Now my battery only has 9.67 volts and the car has no power what so ever. NONE. Turn the key and nothing, no dash, no interior lights, nada. The car makes a buzzing sound from the CEM area while just sitting there that freaked me out so I disconnected the battery in fear and it stopped. Obviously it's getting power but not in a good way...Battery is currently charging, there was no change when I set the charger to jump start and tried to start the car. Same thing happened. WHAT IS GOING ON????? I haven't found any blown fuses yet but I did discover an old blown 10amp fuse near the cargo fuse/relay box laying underneath...no fuses missing or blown in the fuse box. Any help is greatly appreciated.

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SwissXC90

· #6 · Sep 22, 2021

A parasitic draw of 0.19mA (190uA, or 190 microamps) is absolutely nothing whatsoever and well below the perfectly normal level.
In fact, it is so incredibly low that I would suspect something is wrong.

On these cars, somewhere around 10mA to 20mA would be normal when in full sleep mode. But not more than 20mA, and certainly not less than 1mA, as you are reporting.

As for all the electrical weirdness, that was just low battery voltage. Charge the battery outside the car (as you did), clear all the fault codes (you should do this) and see what happens next.

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SwissXC90

· #23 · Sep 27, 2021

If you have parasitic draw, and a factory alarm, unplug or pull the fuse for the alarm siren. See if the drain drops.

The siren has an internal battery that charges from the vehicle power. The batteries are known to leak and drop battery alkaline onto the circuit board. This causes many weird issues.

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SwissXC90

· #25 · Sep 27, 2021

Ah the good old binary search algorithm put into practical use

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