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Old 06-27-2021, 05:01 PM
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Rear final stage resistor

BMW 6 369 561
Has anyone changed the rear FSR? Is it on the same circuit as the front? I'm wondering if this rear resistor is part of my X5 no sleep mode. The speeds work fine on mine.
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Old 06-27-2021, 11:15 PM
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I didn't change it but I could, I have rear blower out right now
Not a pro by any means, but looking at the wiring diagrams, it looks to me they are on different circuits, with the same control module (A11).
If you think the resistor won't let your car go to sleep, maybe just pull it out to test?
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Old 06-28-2021, 07:40 AM
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Thanks to this board, I've acquired a Foxwell NT520 Pro. It will let me command sleep mode on demand. So closing the door latch and commands, I can do further testing. If wiring diagrams show it's on the same module, I'll definitely unplug it and test sleep mode. By information I've found, it seems I'm down to the fixing the consumer cut off relay inside the GM3. I've replaced a few parts and pulled a few fuses for testing sleep mode.
I learned about the rear final stage resistor from a YouTube video.
https://www.youtube.com/watch?v=UK_aO_TV-Rk
The video shows all the dash modules and locations.

The passenger seat may have to come out to reach it.
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Old 06-28-2021, 08:38 AM
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Rear final stage resistor

I would be surprised if rear FSU wouldn't cause the same no sleep condition. There is no connection between no sleep and does it function. Wife's worked fine when it sucked the battery dead over night.

My understanding is it's a lot harder to get to than the front one so hopefully you can pull a fuse to test it
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Old 06-28-2021, 09:33 AM
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Neither of the final stages are connected to any bus so they can't affect sleep mode. Front blower final stage has Terminal 30 (direct battery voltage) supply so it can activate the front blower on it's own and drain the battery. Rear blower final stage is connected to Terminal 15 (voltage supply on ignition switch pos.2) so it can't cause battery drain by itself. Both final stages get separate PWM activation signals from IHKA.
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Old 06-28-2021, 09:43 AM
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Correct, they are not on the BUS system. They are tied to the "P"ark light circuit (right?). The little orange light not going out is driving me crazy. After two days, if not driven, the X5 has to be boosted. With my new scanner, I'll check the amp draw after commanding sleep mode. Hopefully, the amp draw will give clues to what is causing the battery drain.
The front FSR, electric key tumbler, fuse 74 is out, and radio fuse have been pulled or changed for testing. All the interior lights turn off. A few bulbs were replaced. The glove box light is questionable. I have not looked for the glove box switch. The flashlight port does work. Two flash lights have been charged with it. Right now, the flashlights are not inserted.
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Old 06-28-2021, 10:34 AM
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Good news about rear FSU not T30.


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