Parasitic Battery Drain e53

[Clavurion]

Originally Posted by andrewwynn

The FSU can draw any amount from almost zero to multiple amps. The are two of them and they can fail with no other symptom than parasitic draw

The rear FSU doesn't have a direct Terminal 30 supply but is supplied via ignition switch. So the rear one can't cause parasitic drain unless the ignition switch has also failed.

[andrewwynn]

Good to know about the back FSU not always powered


Sent from my iPhone using Tapatalk Pro

[Bmwe5320023.0]

Tried both FSU in the front and rear, no change.

So I start with 2.3 amp draw.
Car goes to sleep, I have around 700mA draw
I removed this connector

Car goes to 400mA draw

Now I remove this connector

Draw goes to 113mA

I disconnect remote starter, draw goes to 92 mA

I disconnect driver side door module, draw goes down to 77mA
I disconnect passenger side door module, draw goes down to 64mA

I disconnect a fuse I used for power supply for my fiber optical headliner, draw goes to 27mA

I disconnect fuse F86 5A Auxiliary heater and draw goes to 23mA

Everything else I tried disconnecting, draw remains the same. Not sure what is still active but 23mA is fine.
I guess with door modules connected it would be 51mA, which would be acceptable. Extra 21mA draw would be acceptable for a remote starter.
If I'm around 72mA draw, that'd be pretty good. I haven't isolated how much the front/rear camera would draw, but probably not too much.

I guess all the major draw comes from the 2 connectors going to the fuse box. Now just gotta look up what fuses they're responsible for and continue investigating where it leads me.

[Bmwe5320023.0]

Looks like XO blocked the use if external image services.
These are the connectors responsie for about 600 of 700 mA of draw while car is in sleep.

[wpoll]

Originally Posted by Bmwe5320023.0

Looks like XO blocked the use of external image services.

I'm not sure what's happened here - I've seen this happen too but your links don't work on their own, so it might not be XO that is the problem... but I cannot post links right now either...

(I cannot even mention i-m-g-b-b.c-o-m or the post gets blocked...).

Originally Posted by Bmwe5320023.0

These are the connectors responsie for about 600 of 700 mA of draw while car is in sleep.

Left side connector is X10460 (32pin).

Right side connector is X10456 (10-pin).

There are mulitple items associated with these plugs - you'll need to isolate each item after identifying them via WDS etc.

[Bmwe5320023.0]

Maybe it was a glitch, pictures loaded

What I found on WDS

X10460
F11, 12, F13, 14, 15, 41, 42, 43, 44, 45

F11

(5A) Immobilizer

F12

(5A) Instrument illumination, steering position sensor

F13

(5A) Alarm system, interior rearview mirror

F14

(5A) Multifunction control module 1

F15

(5A) Tyre pressure monitor control module(^02/04)

F41

(5A) Rear screen wash/wipe system, multifunction control module 1

F42

(5A) Interior lamps

F43

(5A) Instrument panel

F44

(5A) Airbag, electric seats

F45

(5A) Instrument panel

X10456
F27, 28, 29, 51, 57, 58, 59, 60,

F27

(20A) Multifunction control module 1

F28

(30A) Headlamp washers

F29

(10A) Airbag

F51

(10A) Anti-lock brake system (ABS), engine management

F57

(15A) Suspension control module

F58

(20A) Sunroof

F59

(20A) Auxiliary heater

F60

(30A) Multifunction control module 1


Now time to start pulling fuses to see where the draw is coming from.

[Bmwe5320023.0]

Findings

Drops in parasitic draw

Drop from 700 mA to 430 - 470 when fuse 43 (Instrument panel) is pulled

Drop from 700 mA to 390 - 410 when fuse 48 (Heater/air conditioning (AC)) is pulled

Drop from 700 mA to 375 - 385 when fuse 27 (Multifunction control module 1) is pulled

Pulling fuse 14 (Multifunction control module 1) causes alarm to go off for some reason

While I was pulling all these fuses, I noticed something weird. Draw would sometimes drop to 300-400 mA or sometimes to even around 70-100 mA.
Then I noticed a faint sound of a fan. I knew right away it was the small fan in the heater control panel.
But while I was checking fuses, the fan would come on some times, and go off at others, within 1 minute. The draw would vary based on this.

Pulling fuses 27 and 48 made the small fan stop spinning and draw drops from 700mA to 400.

While sitting in the car I also noticed that the draw would randomly drop from 700mA to around 440 even with the fan spinning. So this must be the drop from the system going to sleep from fuse 43.

I did notice at some point when the fan stopped spinning, the small light on gear shift selector was off. And when it started spinning, the light was on.

So then I sat in a car for a bit and the fan stopped spinning and the light on the gear selector went off, draw dropped to about 70-100mA.

What's interesting, I definitely didn't sit for 16 minutes. So I'm not sure why the car goes to sleep so fast. And maybe it wakes up randomly for some reason too.

Then I noticed if I moved around in the car, the fan would come on and the draw would be back to 700mA.
Maybe it's the movement sensor in the headliner that activates this fan?

Then I literally stopped moving and within 1 minute the fan stopped and draw was back to 70-100 mA.
I then waved my arms in the car and then the fan activated and draw was back to 700 mA.
I repeated this sequence 3 more times.

If I move in the car, fan activates, gear shift selector light comes on and draw goes from under 100 mA to 700 mA.
If I don't move for 1 minute, the fan turns off, draw drops and gearshift selector light goes out.

I guess I'll have to do some more monitoring to see if the car goes to sleep or not.

If it does, I need to think it there's any other draw I need to find or if 70-100 mA is acceptable (I think it is).

The last step would be to figure out the camera draw. Plugging/unplugging the camera makes the draw go up/down by 200-300 mA. Not sure it the camera goes to sleep mode as well and the draw drops as well.

[Fifty150hs]

Originally Posted by Bmwe5320023.0

Findings

Drops in parasitic draw

Drop from 700 mA to 430 - 470 when fuse 43 (Instrument panel) is pulled

Drop from 700 mA to 390 - 410 when fuse 48 (Heater/air conditioning (AC)) is pulled

Drop from 700 mA to 375 - 385 when fuse 27 (Multifunction control module 1) is pulled

Pulling fuse 14 (Multifunction control module 1) causes alarm to go off for some reason

While I was pulling all these fuses, I noticed something weird. Draw would sometimes drop to 300-400 mA or sometimes to even around 70-100 mA.
Then I noticed a faint sound of a fan. I knew right away it was the small fan in the heater control panel.
But while I was checking fuses, the fan would come on some times, and go off at others, within 1 minute. The draw would vary based on this.

Pulling fuses 27 and 48 made the small fan stop spinning and draw drops from 700mA to 400.

While sitting in the car I also noticed that the draw would randomly drop from 700mA to around 440 even with the fan spinning. So this must be the drop from the system going to sleep from fuse 43.

I did notice at some point when the fan stopped spinning, the small light on gear shift selector was off. And when it started spinning, the light was on.

So then I sat in a car for a bit and the fan stopped spinning and the light on the gear selector went off, draw dropped to about 70-100mA.

What's interesting, I definitely didn't sit for 16 minutes. So I'm not sure why the car goes to sleep so fast. And maybe it wakes up randomly for some reason too.

Then I noticed if I moved around in the car, the fan would come on and the draw would be back to 700mA.
Maybe it's the movement sensor in the headliner that activates this fan?

Then I literally stopped moving and within 1 minute the fan stopped and draw was back to 70-100 mA.
I then waved my arms in the car and then the fan activated and draw was back to 700 mA.
I repeated this sequence 3 more times.

If I move in the car, fan activates, gear shift selector light comes on and draw goes from under 100 mA to 700 mA.
If I don't move for 1 minute, the fan turns off, draw drops and gearshift selector light goes out.

I guess I'll have to do some more monitoring to see if the car goes to sleep or not.

If it does, I need to think it there's any other draw I need to find or if 70-100 mA is acceptable (I think it is).

The last step would be to figure out the camera draw. Plugging/unplugging the camera makes the draw go up/down by 200-300 mA. Not sure it the camera goes to sleep mode as well and the draw drops as well.

Motion sensor for the security system signaling the car to wake up when you move? I don't know, just a swag. Is car asleep when you are checking these draws? Takes about 15 minutes for it to go to sleep. The fan your hearing is in the IHKA and it draws air into the temp sensor for the heating/cooling system.

[Bmwe5320023.0]

I swear the car goes to sleep, amp draw is minimal (70mA) and then I stick my hand through a window and the draw jumps to 1.5 amps and trunk door lights come on.
If not motion sensor, then what?

[Fifty150hs]

Originally Posted by Bmwe5320023.0

I swear the car goes to sleep, amp draw is minimal (70mA) and then I stick my hand through a window and the draw jumps to 1.5 amps and trunk door lights come on.
If not motion sensor, then what?

Has to be a motion sensor.