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Boston01X5 08-05-2018 07:56 AM

AC Issue - Control Panel or Control Module?
Hey everyone,

I have an issue where my AC stopped working, the control panel totally shutoff, it turned on heat, and when I pulled key out of ignition blower was still running.

The first time it happened I disconnected the battery and that fixed the issue for a few days, now it's back. I yanked the fuse so the blower isn't constantly running.

From what I've read it could be the FSU (blower resistor), the climate control panel, or the climate control module. Some people have had all 3 fix this issue from what I have read.

The FSU is cheap enough I could start with that.

Would appreciate any advice about how to determine what the problem is.

Thanks very much,


andrewwynn 08-05-2018 09:41 AM

Blower on power off the go-to is FSU (Final stage unit) aka FSR. But that won't usually take out power to the panel.

I would check all fuses related then expect to change FSU

Boston01X5 08-05-2018 09:56 AM

Your correct it's called the FSU, was a typo.

I will check fuses and grab an FSU today and put it in if needed.

Also, not sure if this matters but I have a scanner that can read codes from the individual modules. On this car there is almost 20 I believe. After this problem happened it no longer lists the AC module because I tried to check for codes. Not sure if that might be a clue as to what is wrong.

Appreciate the help very much, thanks


Boston01X5 08-05-2018 10:43 AM

Got a price yesterday for the FSU and was super cheap, $30 at Advanced Auto they ordered it and it was supposed to be here this morning. Just went but to pick it up and it's $130.

What should I pay for an FSU? Online they range from $30 on eBay, to over a hundred. I don't want to spend that type of money if that's not the problem. Generally with electrical parts as soon as you plug them in you cannot return that is what guy said.

Any advice?

Qsilver7 08-05-2018 11:08 AM

Do a google search using the phrase "BMW e39 FSR FSU Bluebee". This is a much discussed topic and back a few years ago Bluebee had a huge thread that discussed the different brands of FSR (final stage resistors) or FSU (final stage units) and many comments were made as to they longevity of several brands and the best ones to get.

Accordingly, any prices listed from over 3-5 years ago will not be the same...but the quality of the brand name should be similar. The e39 and e53 uses the same FSR/FSU.

Boston01X5 08-05-2018 11:41 AM

Thanks very much Qsilver, it's been over 90 here with crazy humidity for the past few weeks with no end in sight so what a time for this problem to happen ;)

I will check out that post now appreciate the heads up.

Boston01X5 08-05-2018 05:19 PM

Hey guys I had the day off so I did some diagnosing.

Found a video online showing how to test the power to the control panel there are two connectors on back, pins 1 on both are the power. With key in ON position they are both getting 12 volts which is perfect.

Also checked the ground to the control panel and it's also perfect.

So this control panel is getting power and has a good ground and is totally dead doesn't turn on at all.

Is it safe to assume I need to replace it?



PS: link to the video, I found it helpful - for anyone who finds this thread in future https://youtu.be/6AUacShEkbk

Boston01X5 08-07-2018 07:51 PM

Hey guys just an update, and in need of some help.

Got a used heater control panel, plugged it in and it is all lit up and controls the blower perfectly :)

It corrected the issue of blowing heat, and the blower running without key in ignition etc.

However there is no AC now, the fan for the AC doesn't kick on or anything.

Any suggestions?



amancuso 08-07-2018 08:18 PM

Did you put all your fuses back in?

Boston01X5 08-07-2018 08:29 PM

Yes I put all the fuses back in after installing the panel.

When I first installed the panel it lit up but blower was not running, then I put back fuse (the big 50 amp) blower kicked on and speed was controlled by the buttons no problem.

So when I click auto it bumps the blower speed to max, but for some reason is not kicking on the AC.

Thanks for the reply :) appreciate it.

Any suggestions where to look next?

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