|
Xoutpost server transfer and maintenance is occurring.... |
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Power TCU trough Ignition position -Battery Drain- Solved
Long story short: Besides this power drain, the bluetooth module is working great and I love the quality of the microphone and everything else. I really would like to keep it in working condition. The solution that came to my mind is to power the TCU trough a power source that is directly bond to the ignition switch position. Logic: Key turned = TCU powered, Key removed = TCU without power. I could cut the original power supply to fuse 74 and steal the power from the rear lights, but I guess the LCM would notice a too high power drain. Maybe some of you have a smarter idea or approach on how to power this unit (obviously always securing the circuit with the proper fuse). Last edited by whizzkid23; 07-11-2019 at 04:10 AM. |
Sponsored Links | |
|
#2
|
|||
|
|||
Quote:
|
#3
|
|||
|
|||
Maybe approach the problem at a different angle. Use the same power feed but install a relay to open the existing circuit when the key is off. Not sure though what effect this would have on the TCU operation, it might need to have power all the time or maybe need power before the key is turned on.
__________________
1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#4
|
|||
|
|||
Quote:
I will now use the car without fuse 74 in the coming days, to confirm the culprit 100%. |
#5
|
|||
|
|||
Quote:
Prior i will obviously check if the system works when the tcu is powered on later... |
#6
|
|||
|
|||
There must be other circuits you could use, but yes if you want to use rear lights then using a small relay (and a capacitor and diode because the light circuits are PWM) you might be able to get away with not triggering a warning from the LCM. Does the power draw come from the TCU itself or the fact that it wakes up the car?
__________________
1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#7
|
||||
|
||||
Fuse 74 responsible for:
__________________
Digital Competition Systems The older I get... The faster I was... No Fear |
#8
|
||||
|
||||
I cured mine by removing it and putting it in a box in the house. Hasn't bothered anything since
I tried replacing it at first with a unit off ebay which worked for a week or so and it was back draining the battery again. Went to an aftermarket radio and ditched the tcu was the final solution. That said your idea of making it key switch would be a good solution.
__________________
Just BMW's - All cars and trucks was two pages long 1994 318is 1997 528i 2000 323i 2001 X5 3.0 auto 2005 X5 3.0 auto 2011 535xi auto 2013 X5 xdrive35 Turbo More are at my website Aftermarket E53 Radio Install |
#9
|
|||
|
|||
Quote:
|
#10
|
|||
|
|||
Quote:
Thanks a lot to all for the help. I actually don't think the faulty part is the TCU (even if it's the one which drains the power). The fact that you replaced yours and had the same problem a few days later somehow confirms this thinking. In my case the module keeps waking up every 5-10 minutes ...draining for 3-4 minutes and then goes to sleep again. I really would like to understand what is causing this but....it's so time consuming that I really tend towards simply cutting the power supply trough the ignition switch position. |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|
|