Kessy unit drain my battery!
#1
Kessy unit drain my battery!
Hi friends. I need your help. I discovered a big battery drain from my car. I have 2004 Porsche Cayenne Turbo 4.5. So, I bought voltmeter and found two fuses that drain my battery, fuse #40 which is for "Instrument panel, diagnosis" and fuse #41 which is for "Kessy control unit". Then I remove them to check if the drain will stop and it stoped, so I put fuse #40 back and everything was ok until I put fuse #41 and than drain started again from both units. My theory is that something in that Kessy is wrong and keep instrument panel awake and that is major drain. I also hear some noise from that area every 5/6 seconds (maybe more) when voltage from that fuse goes up so it must be something wrong with that Kessy unit. If I purchase another Kessy from other car, my key probably wont work so I want to know if I buy Kessy and the key from the same car, will it work on my car or I have to do something else? Any help or suggestion from would be appreciated! Thank you very much, best regards!
#2
Racer
Is there a chance a door micro switch is stuck and the car doesn't know it is closed up? I don't have keyless entry, but it is my guess that Kessy unit sends a command to the cluster to allow it to go into "accessories" mode (first position on a regular key car).
#3
No, that is not the case. Instrument clusters do not turn on but they are draining my battery because of Kessy unit that sends some kind of signal in that unit and keep it awaken. When I remove fuse for Kessy Instrument unit goes to sleep and everything is ok.
#5
#6
This might help, from another post.
Please update if you fix it.
What is more likely is the kessy module is at fault.
I’ve got slight issues with mine (some door buttons not working, key not found randomly appears) so have been doing some research.
These are long threads but may help.
https://www.renntech.org/forums/topic/37055-keyless-kessy-entry-problem-fixed-after-5-dollars-and-1-hour-o/?page=1
http://www.clubtouareg.com/forums/#/topics/45716?page=1
http://forums.vwvortex.com/showthrea...topics/5734874
Please update if you fix it.
What is more likely is the kessy module is at fault.
I’ve got slight issues with mine (some door buttons not working, key not found randomly appears) so have been doing some research.
These are long threads but may help.
https://www.renntech.org/forums/topic/37055-keyless-kessy-entry-problem-fixed-after-5-dollars-and-1-hour-o/?page=1
http://www.clubtouareg.com/forums/#/topics/45716?page=1
http://forums.vwvortex.com/showthrea...topics/5734874
#7
This might help, from another post.
Please update if you fix it.
What is more likely is the kessy module is at fault.
I’ve got slight issues with mine (some door buttons not working, key not found randomly appears) so have been doing some research.
These are long threads but may help.
https://www.renntech.org/forums/topic/37055-keyless-kessy-entry-problem-fixed-after-5-dollars-and-1-hour-o/?page=1
http://www.clubtouareg.com/forums/#/topics/45716?page=1
http://forums.vwvortex.com/showthrea...topics/5734874
Please update if you fix it.
What is more likely is the kessy module is at fault.
I’ve got slight issues with mine (some door buttons not working, key not found randomly appears) so have been doing some research.
These are long threads but may help.
https://www.renntech.org/forums/topic/37055-keyless-kessy-entry-problem-fixed-after-5-dollars-and-1-hour-o/?page=1
http://www.clubtouareg.com/forums/#/topics/45716?page=1
http://forums.vwvortex.com/showthrea...topics/5734874
Trending Topics
#8
What are the odds that this turned out to be your problem? I'm experiencing EXACTLY the same thing and have had no luck with the dealer. Thanks!
#9
#10
THANK YOU!!!
#11
EDIT:
Also, I was told that my Kessy could communicate with the OBD-II scanner DEFORE the repair and I never have had any issue starting the car with the dummy key prior to the repair. It still functions AFTER the repair, but wasn't sure if there might be more going on. Are these symptoms that you had as well? Did your ignition and key FOB still function as expected even when the Kessy was using the two bad MOSFETs and resistors?
Last edited by munkittrick; 07-04-2023 at 08:39 PM.