01-23-2022, 08:55 AM | #23 |
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Kind of stating the obvious here, once you guys are able to find wire colors and pin locations, you might be able to do the old fashioned work of using a multimeter to see if you have power and where. I.e. does the seat get power but not get warm (issue in the seat), does the seat not get power from an ECU type module (ECU being dumb / busted), does the switch itself maybe not actually work properly, is a wire powered but only part way indicating a break in it. And so on.
My seats seem to work but I've been following along and hope you get it sorted out! |
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01-23-2022, 11:05 AM | #24 |
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Hey tracer. Yeah I checked a couple of places with the multimeter, the power to the passenger seat module and to both of the rear seat switches and they have power to them.
I'm not sure if a multimeter works to check the LIN_BUS (yellow coloured wire) with a Multimeter. From what I see on the internet you need some special analytical tool to properly check the LIN_BUS?. I attached photos of the rear seat switches, passenger seat and AUC Sensor that I checked and put an arrow to the LIN_BUS wire (Yellow) – that’s according to the previous photos. I also put this link that gives a simple breakdown of the LIN_BUS and CAN_BUS – (simple – yeah right – hahah). But seeing that there is a Master and a Slave confuses me more and maybe there is an issue with the Slave and thus that row of components don’t work? I’m not sure which part is the Slave on this line – if there is even one. https://www.csselectronics.com/pages...l-intro-basics .... and again I'm really just trying to trouble shoot with a very very limited knowledge (okay none) on LIN_BUS and CAN_Bus so if anyone knows that stuff please HELP!!! haha |
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01-23-2022, 02:00 PM | #25 | |
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01-24-2022, 08:04 AM | #26 |
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Thanks Jonmon, that’s awesome and language I can understand – haha. Makes a lot of sense now. I’ll check the LIN_BUS lines on some of the modules (Slaves) this week and see what the readings are.
One question – would you know if it’s possible for the JBE to lose it’s coding for all of the 7 slaves on that line? Or would that be highly unlikely or impossible. |
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01-24-2022, 03:38 PM | #27 | |
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01-24-2022, 05:27 PM | #28 |
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Drives: F25 X3, F23 M235i, F83 M4
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SOLVED! There are three seat heat modules, one under each of the seats that have no heat: right front and both rear. They are all the same, BMW part number 61-35-7-490-465 Control Module. My dealer (Sandia in ABQ) suggested that I take my shiny new module and try it under EACH of the three seats, one at a time. Sure enough, like a series-wired light circuit, if one fails, the whole string goes down. On my third attempt (right rear), the whole system came alive and all works normally. So get a new module and try it under each seat until you hit on the correct one. (Hopefully only one of three is bad, as was my case!) They are easy to get and remove with no tools.
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01-24-2022, 10:24 PM | #30 | |
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01-25-2022, 08:34 AM | #32 | |
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01-25-2022, 05:17 PM | #33 | |
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Last edited by mineralfarmer; 01-25-2022 at 05:26 PM.. |
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01-31-2022, 11:17 AM | #35 |
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Absolutely great timing on this, as this just happened to me this weekend. Wifey not happy I was the only one to have heat at 22 degrees F - though I did ask if she wated to dive, as only the driver seat heat is working! It was not convincing enough an argument though...
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02-01-2022, 03:42 PM | #36 |
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You were right jonmom
Hey Jonmon, just got a chance to take a look at my modules and you were right!!! I unplugged my right rear seat module and both rear heated seat lights went on and the left rear and right front heated seats began to work.
So it looks like the right rear module was the problem and just like you thought, when the bad module was unplugged, it solved the issues for the other heated seats and AUC sensor. I hooked up the Diagnostic Scanner and now the 7 codes cleared and it only shows the R.R. seat as an error. Probably won’t pay the $550.00 CAD for a new module, I’ll just have the family members I don’t like sit in that rear seat in the winter. - hahah I’ve attached some photos of the connection that I unplugged at the module. I see Lurcher has the same problem so this might help him and more importantly his wife – hahaha. Thanks again to Jonmom and Mineralfarmer for solving the problem if it wasn’t for you guys I’d still be in search of that illusive X227”1V junction. I was obsessed. Hahah. Anyway I owe you guys a beer!!!! |
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02-01-2022, 09:53 PM | #37 | |
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02-02-2022, 06:06 PM | #38 |
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I might do that. I called our local bmw dealer last week after mineralfarmer showed the part number 61-35-7-490-465 for the Control Module and that one is $550 here so the backseat ones may be cheaper. I’ll do some checking on line too. Thanks again.
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02-15-2022, 09:10 AM | #39 |
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Just replaced mine - left rear. Of course I started with front right , then rear right....
For those who don't know - rear seat, bottom cushon, just pulls up from the front lip of the cushon. Modules on the left and right side attached underneath. 3 cable bundles in pic above, just use your nail and push tab down and pull out. Module has a snap fitting you just pull out to release. Paid ~$300 US for module. ~20 min to fix. Just replace one , crank car, try to tun rear seat on. Get a light - found the bad one - if not, try again! |
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tracer bullet3444.00 |
10-15-2022, 01:24 PM | #40 |
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X3 F25 Passenger front seat heater not working
Thanks for the awesome thread! Unplugging the power from passenger rear module was the ticket for me as well! Rear seat heater switches illuminated, and all is good in the neighborhood! I'll order a replacement via e-bay as there are a ton listed for <$50.00. Note: when turning off the switches, there is a faint 'click' signaling (to me at least) the module is operating properly.
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12-14-2022, 01:24 PM | #41 |
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Hi, thank you guys to share your experiences and knowledges. I got the exact issue and found the root cause - the R.R seat control module.
Merry Christmas and Happy New Year! |
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12-04-2023, 12:14 PM | #42 |
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Just wanted to thank everyone on this post that did the hard work. I had just noticed recently my rear heated seats weren't working and this fit my problem to a T. I originally thought it was related to some work the dealership did that where they had to recode the truck, but low and behold it was the same passenger rear seat module. Its sooo weird that everyone seems to have the same seat module location as the problem.
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03-09-2024, 12:43 PM | #44 |
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another one fixed - thanks!
Just thought I'd add another success story (and thanks) My front passenger and rear seat heaters weren't working, found this thread, replaced the controller under the passenger side rear seat, solve the problem!
I found a used controller on ebay for under $10 shipped, worked fine. Looks like the original part number might be superseded but I went with the original, we'll see how long it lasts |
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