Ran over a pothole and now my climate control unit doesn't work...help !

tscdennab · 12-02-2011, 03:10 PM

Hi,

A strange thing happened today: I ran over a pothole with both the right wheels (not a really big one, suspension is ok but it did shake the car pretty good) and now my (dual-zone climatronic) climate control unit doesn't work: no LED on buttons are lit, nothing appears on the display. It's just dead. I do have a 3rd party warranty but I am also technically savvy and I would like to take a look myself at the sockets, fuses, etc. until Monday when I will probably visit the dealership.

Any idea what may have happened ? Could the unit be really damaged from the impact or maybe there's a loose connection/socket somewhere ? I looked at some of the fuses and they seem ok. How can I remove the climate control unit from the dashboard to take a look at the sockets, does anyone have an idea ?

I scanned the car with the BT tool and it seems the unit cannot be accessed:

" Heating and Air conditioner (IHR/IHKA) control unit

Unable to parse fault information for: Heater and Air conditioner (IHR/IHKA) "

Thanks !

ctuna · 12-02-2011, 04:17 PM

When I dissconnected the battery cable on mine the display
on the climate control came up dead until I pressed the left climate
control button. I didn't know it had an on/off switch.
By the way is it manual or dual zone automatic.?

I think I remember hitting the max button when the display was dead
and it came back to life.

Dynavin installation thread shows how to remove it and I think there is also
a DIY on replacing the control unit with the new one that has a single heat zone options.

tscdennab · 12-02-2011, 05:06 PM

Thanks for the info, I pressed every button on it, nothing. It's the dual zone automatic. Are there any other buttons related to the climate control ? I also have iDrive.

I removed the control unit from the dashboard and I checked to see if there is voltage in the back of the unit. There is voltage (5v and 12v) coming at the unit on some wires on the left socket (strange, the red wire does not receive voltage, I assumed that should be a 12v wire). The right socket has no voltage,but I tend to think that is the output socket.

I tend to think the unit is dead...I wonder if there are any test instructions for the climate module somewhere on the Internet ? It does have some test pins on the back of it, but they are useless without instructions.

ctuna · 12-02-2011, 05:16 PM

Allow the car to reboot thats about the only thing left if the fuses are good.

http://bmwcoders.com/forum/attachmen...te-control-pdf

http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/

I found a bunch of pdf's that might be of some use above

tscdennab · 12-02-2011, 05:32 PM

Quote:

Originally Posted by ctuna

Allow the car to reboot thats about the only thing left if the fuses are good.

http://bmwcoders.com/forum/attachmen...te-control-pdf

http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/

I found a bunch of pdf's that might be of some use above

Thanks, I didn't check all the fuses yet, I will check all of them tomorrow. But since it receives some voltage I think it's just dead.

I wonder if this IHKA unit needs coding after replacement ?

cptcrunch · 12-02-2011, 09:21 PM

The only thing I could think of would be the fuses. Would it be worth while to unplug the fuse for the hvac, and then plug it back in? Sort of like rebooting just the hvac screen.

How big of a pot hole? I'm wondering if (unlikely) one of the wires became loose. Still under warranty?

tscdennab · 12-03-2011, 07:24 AM

Thanks everyone.

I just found the fuse #77 was blown. On the diagram, this fuse has to to with glovebox lights and also with air conditioning (which was on when I passed over the pothole). However my glovebox light did not work since a year or so ago, but I ignored it.

BUT after replacement of the fuse #77, the new fuse blew again before anything lit up on the A/C control panel so it's still dead...maybe this fuse doesn't have anything to do with my problem, or maybe a fan seized because of the impact and blows this fuse repeatedly ?

I'll keep searching...I don't have the Bentley manual handy (I'm away from home) but I do have one, I suppose I will have to permanently carry it in the car from now on

I think I will just take the car to the dealership on Monday...

tscdennab · 12-03-2011, 10:12 AM

Problem Solved !

When the glovebox lightbulb blew last year, the glass of the bulb broke and the clamps holding the bulb in place went loose. When I ran over the pothole, the clamps moved such that they touch each other, causing fuse #77 to blow up repeatedly. The #77 also powers the A/C control unit (a bit unintuitive from BMW's part). When I took out the glovebox socket after seeing what was inside it and replaced the fuse #77 once again, everything begun working perfectly. Pfew !

cptcrunch · 12-03-2011, 04:11 PM

Quote:

Originally Posted by tscdennab

Problem Solved !

When the glovebox lightbulb blew last year, the glass of the bulb broke and the clamps holding the bulb in place went loose. When I ran over the pothole, the clamps moved such that they touch each other, causing fuse #77 to blow up repeatedly. The #77 also powers the A/C control unit (a bit unintuitive from BMW's part). When I took out the glovebox socket after seeing what was inside it and replaced the fuse #77 once again, everything begun working perfectly. Pfew !

Good to know. Good troubleshooting!

12-02-2011, 03:10 PM	#1
tscdennab Banned 154 Rep 1,809 Posts Drives: BMW 335i Join Date: Oct 2010 Location: Europe iTrader: (0) Garage List 2008 BMW [6.24]	Ran over a pothole and now my climate control unit doesn't work...help ! Hi, A strange thing happened today: I ran over a pothole with both the right wheels (not a really big one, suspension is ok but it did shake the car pretty good) and now my (dual-zone climatronic) climate control unit doesn't work: no LED on buttons are lit, nothing appears on the display. It's just dead. I do have a 3rd party warranty but I am also technically savvy and I would like to take a look myself at the sockets, fuses, etc. until Monday when I will probably visit the dealership. Any idea what may have happened ? Could the unit be really damaged from the impact or maybe there's a loose connection/socket somewhere ? I looked at some of the fuses and they seem ok. How can I remove the climate control unit from the dashboard to take a look at the sockets, does anyone have an idea ? I scanned the car with the BT tool and it seems the unit cannot be accessed: " Heating and Air conditioner (IHR/IHKA) control unit Unable to parse fault information for: Heater and Air conditioner (IHR/IHKA) " Thanks ! Last edited by tscdennab; 12-02-2011 at 03:20 PM..
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12-02-2011, 04:17 PM	#2
ctuna Lieutenant General 2027 Rep 13,331 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Did you try pressing the leftmost control button When I dissconnected the battery cable on mine the display on the climate control came up dead until I pressed the left climate control button. I didn't know it had an on/off switch. By the way is it manual or dual zone automatic.? I think I remember hitting the max button when the display was dead and it came back to life. Dynavin installation thread shows how to remove it and I think there is also a DIY on replacing the control unit with the new one that has a single heat zone options. Last edited by ctuna; 12-02-2011 at 05:13 PM..
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12-02-2011, 05:06 PM	#3
tscdennab Banned 154 Rep 1,809 Posts Drives: BMW 335i Join Date: Oct 2010 Location: Europe iTrader: (0) Garage List 2008 BMW [6.24]	Thanks for the info, I pressed every button on it, nothing. It's the dual zone automatic. Are there any other buttons related to the climate control ? I also have iDrive. I removed the control unit from the dashboard and I checked to see if there is voltage in the back of the unit. There is voltage (5v and 12v) coming at the unit on some wires on the left socket (strange, the red wire does not receive voltage, I assumed that should be a 12v wire). The right socket has no voltage,but I tend to think that is the output socket. I tend to think the unit is dead...I wonder if there are any test instructions for the climate module somewhere on the Internet ? It does have some test pins on the back of it, but they are useless without instructions.
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12-02-2011, 05:16 PM	#4
ctuna Lieutenant General 2027 Rep 13,331 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Battery disconnect Allow the car to reboot thats about the only thing left if the fuses are good. http://bmwcoders.com/forum/attachmen...te-control-pdf http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/ I found a bunch of pdf's that might be of some use above
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12-02-2011, 09:21 PM	#6
cptcrunch Captain Crunch 169 Rep 547 Posts Drives: 2016 340i Join Date: May 2011 Location: Cincinnati iTrader: (0)	The only thing I could think of would be the fuses. Would it be worth while to unplug the fuse for the hvac, and then plug it back in? Sort of like rebooting just the hvac screen. How big of a pot hole? I'm wondering if (unlikely) one of the wires became loose. Still under warranty? __________________ On Order (in transit): BMW iX 50, Oxide Grey Retired: BMW Welt Delivery 4/14/16: European Delivery - 2016 340i EBII/Saddle - ZMP \| ZCW \| ZDA \| ZLP \| ZTP \| M Adaptive \| Rear Shades \| MPPSK Before and After Dyno Retired: 2011 335D Space Grey/Black - ZSP \| ZPP \| ZCW \| 6FL \| Sat Radio \| Nav \| $600 Base Audio Upgrade
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12-03-2011, 07:24 AM	#7
tscdennab Banned 154 Rep 1,809 Posts Drives: BMW 335i Join Date: Oct 2010 Location: Europe iTrader: (0) Garage List 2008 BMW [6.24]	Thanks everyone. I just found the fuse #77 was blown. On the diagram, this fuse has to to with glovebox lights and also with air conditioning (which was on when I passed over the pothole). However my glovebox light did not work since a year or so ago, but I ignored it. BUT after replacement of the fuse #77, the new fuse blew again before anything lit up on the A/C control panel so it's still dead...maybe this fuse doesn't have anything to do with my problem, or maybe a fan seized because of the impact and blows this fuse repeatedly ? I'll keep searching...I don't have the Bentley manual handy (I'm away from home) but I do have one, I suppose I will have to permanently carry it in the car from now on I think I will just take the car to the dealership on Monday...
	Appreciate 0 Quote

12-03-2011, 10:12 AM	#8
tscdennab Banned 154 Rep 1,809 Posts Drives: BMW 335i Join Date: Oct 2010 Location: Europe iTrader: (0) Garage List 2008 BMW [6.24]	Problem Solved ! When the glovebox lightbulb blew last year, the glass of the bulb broke and the clamps holding the bulb in place went loose. When I ran over the pothole, the clamps moved such that they touch each other, causing fuse #77 to blow up repeatedly. The #77 also powers the A/C control unit (a bit unintuitive from BMW's part). When I took out the glovebox socket after seeing what was inside it and replaced the fuse #77 once again, everything begun working perfectly. Pfew !
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