battery drain caused by #60 fuse . . .maybe FSU?

[mcurcio1989]

FSR not FSU oops

Hello I just purchased a 2004 x5 6 spd manual. The PO noted two issues one being the panormaic sunroof and the other that "the mirror motors were both bad and caused a battery drain but pulling #60 fuse prevented the drain." This seemed suspect but a trusted dealer told him that. Anyways when I got the car the mirrors would not stay closed when you pressed the close button and the reverse drop on the passenger mirror was more like a bobble head doll. An hours worth of time and some help from members and I got the mirrors functioning perfect. However I cam doubtful that that was actually causing the battery drain. Here is the thing tho when you shut the car off I can here the sound of a motor turning very slowly. . it sounds kind of like one of those fish tank pumps. This seems to be coming from the hvac control unit. when #60 fuse is pulled voilla it stops and when the fuse is replaced the noise starts up. I am wondering if this is a final stage resistor issue but so far the fan seems pretty flawless no surging or anything like that. I have a video of the sound if that would help?

I will probably try unplugging the FSR tomorrow after work and see what that does to the sound but in the mean time ideas are great! thanks

[admranger]

You have to let the car go into sleep mode which is 15-20 minutes after shutting it off and closing the doors. Then you can see whether that noise is still there (or if there is a drain on the battery).

Glad you got your mirrors working though. One success at a time!

[TerminatorX5]

fuse F60 is feeding the GM module, pin 4 on the connector X254.. naturally, the GM receives power from multiple venues, the F60 being the biggest fuse at 30A... unfortunately, i can't divulge into internal schematics of the modules, to trace the power feed from that fuse but i would think, removing that fuse will disable multiple functions within the car...

do you have air ride?

[mcurcio1989]

^okay that is certainly interesting. I have sport package so air ride in the rear. It looks like the e46 and e53 final stage resistors are the same and my e46 definitely needs one. The fan is all over the place and sometimes will just randomly shut off for a while. So I'm gonna order that for my 3 series and than I can try and plug it in to the x5 as well to see if it takes care of anything.

I guess my question here is is anyone familiar with that sound coming from the hvac unit? It certainly doesn't seem right.

[Zulu95]

Cabin temperature sensor uses a small fan. It is behind the small grill on the HVAC Head unit.

[mcurcio1989]

^well that def sound like a likely candidate for this noise.

I think I really need to verify that there is a drain there cause who knows what stunts the stealership was trying to pull that told the PO that. All I know is that he claims that the he had replaced the battery and the vehicle was dying overnight. Dealership diagnosed it as bad motors in the mirrors. I don't believe that for a second.

This does bring up an interesting question. What exactly does the GM control?? I know it controls a lot of the locking functions but anything else? The dealership instructed the PO to pull the 30amp fuse overnight which he had been doing and he would leave it out all the time. With it out nothing but front driver side and front passenger side doors will unlock. I am pretty sure the mirrors still function tho which is very amusing to me. Sure would be nice if I had a wiring diagram so I could actually know what components are on the #60 circuit.

[TerminatorX5]

the F60 is direct wire to pin on that connector on GM... the other end of the F60 goes to F200, the 200Amp master fuse. The GM has 3 more fused power connections... the GM controls wiper functions, windows, tells the other modules to go to hell... err... go to sleep... obviously the door locks... talks to the alarm system...

[mcurcio1989]

Huh so it sounds like there are really a lot of things that the GM could shut off then. That said the only things that I am noticing the #60 fuse are the ones I noted above as well as this little motor sounds. . .I think some metering and 15 minute waits are in order here to get a better idea.

[Qsilver7]

If your HVAC system's blower fan is running after shut down, or operating erratically...then it's probably the cause of your battery drain. The FSR/FSU controls this operation. But don't confuse the FSR/FSU and the HVAC's blower fan with the little fan inside the IHKA control panel. These are two different components with two different functions & purpose.

Originally Posted by mcurcio1989

...This does bring up an interesting question. What exactly does the GM control?? I know it controls a lot of the locking functions but anything else?

You can get an idea of what the GM controls in the topology chart below. The IKE (instrument cluster electronics) is the considered the "main gate-keeper" since all of the communication buses run to it or thru it:

TIP:

• FZV = central locking system (as well as FBZV - remote central locking)
• DWA = anti-theft alarm siren system

As other's mentioned, the faint sound you hear after turning the vehicle off is probably the little fan inside the IHKA unit. It draws air into the vent on the left side of the IHKA across a thermistor which is how the IHKA regulates & maintains the air temp you have set.

This little fan is on the P-bus which is a low command bus...and there are certain components that remain active until the car goes into SLEEP mode...or become active when the car WAKES.

To check the little fan in the IHKA...as others already mentioned, you need to check back 16 minutes after shut down of the car. BUT YOU CAN NOT LIFT A DOOR HANDLE OR PRESS A BUTTON ON THE REMOTE...if you do, then you WAKE the vehicle up again, thus starting-up the little fan again. You'll need to roll a window down, or remain inside the car touching nothing for the requisite time interval.

[admranger]

There's a guy that repairs the modules out there in the inter webs…ahhh, here's his site:

GM3 repair

I sent him a question about the GM5 module in my wife's E46M3 regarding an intermittent door lock problem we were having. He could have said to just send him the module for repair, but instead he directed me to a more likely cause. Based on that alone I have to say he's worth sending an email too describing your issues. Good luck!