Shallow Draft Posted February 24, 2015 Report Share Posted February 24, 2015 I have a minor problem with the sleeper fan. I can turn it on from the dash but not off. With each push of the rocker it goes up like it is supposed to but pushing the rocker the other way does nothing. I have tried another switch and had the same results. I am wondering if anybody else has had this issue. The switch in the sleeper works as it should. Any suggestions as always is greatly appreciated. Greg Link to comment Share on other sites More sharing options...
skp51443 Posted February 24, 2015 Report Share Posted February 24, 2015 Check for a broken wire or failed connector? Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 24, 2015 Author Report Share Posted February 24, 2015 That is my next step to see if the truck plug side is bad. I did push them all in but sometimes they feel tight and can still be non conecting. they did seem to be tight and all felt the same . I am not sure how the switch operates to make the fan speed up. Is it some sort of rotating clicker or does it send a signal somewhere else? Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 24, 2015 Author Report Share Posted February 24, 2015 Also I am being lazy and don't feel like tearing into the dash panels. I hoped the replacement switch was all it would require. Link to comment Share on other sites More sharing options...
ray.service Posted February 25, 2015 Report Share Posted February 25, 2015 IIRC the switch only inputs "presses" to the LECM which controls the blower. No direct link. Probably a bad wire on the "down" signal to the LECM. Finding the pinouts will take a little digging. Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 25, 2015 Author Report Share Posted February 25, 2015 IIRC the switch only inputs "presses" to the LECM which controls the blower. No direct link. Probably a bad wire on the "down" signal to the LECM. Finding the pinouts will take a little digging. thanks Ray it is as I suspected. No direct link. I am not sure where to even look for this, Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 25, 2015 Author Report Share Posted February 25, 2015 what is the LECM ? Also where is it? thanks Link to comment Share on other sites More sharing options...
MrSeas Posted February 25, 2015 Report Share Posted February 25, 2015 I believe he is referring to the Light Control Module (LCM)..... On my 2005 780 it is located in the middle of the front dash behind the radio. It is a flat rectangular box. Not sure if all models and years are located in the same place. Here is a picture of one....don't know if this is the correct part # for your truck. http://www.ebay.com/itm/like/141301262099?lpid=82&chn=ps Scott On Edit: my bad there is a LECM so my post is incorrect for your problem. Sorry. Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 25, 2015 Author Report Share Posted February 25, 2015 thanks I will look for that and check some plugs Link to comment Share on other sites More sharing options...
ray.service Posted February 26, 2015 Report Share Posted February 26, 2015 Living Environment Control Unit - the controller that is attached/behind the control panel in the bunk wall, driver's side. The fan up/down signals come from the switch in the LECU with the dash switch paralleled to it. The signal is a pulsed voltage on connector A of the LECU. Piin 5 is up and pin 6 is down. I's suspect the "down" signal (wire) from the dash switch is FUBAR somewhere. I'm not sure where the two switches are spiced together but this is a possibility. Just a place to start looking. Hope is helps. Link to comment Share on other sites More sharing options...
bmzero Posted February 26, 2015 Report Share Posted February 26, 2015 I have a similar issue. Mine works fine from the dash, but I can only turn the fan down from the bunk, not up. Man, these things have a lot of circuits... Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 26, 2015 Author Report Share Posted February 26, 2015 Thanks Ray that sounds like the situation and I now know that there is such a thing as the LECU Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 26, 2015 Author Report Share Posted February 26, 2015 bmzero sounds like we have the same issue .It is not a big problem but it would be nice to resolve it Link to comment Share on other sites More sharing options...
bmzero Posted February 26, 2015 Report Share Posted February 26, 2015 bmzero sounds like we have the same issue .It is not a big problem but it would be nice to resolve it Agreed. As far as priorities go, it's pretty far down my list right now. Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 26, 2015 Author Report Share Posted February 26, 2015 agreed on the priorities but I might open the panel and have a look at the wires there. I am sure it is a simple fix. just need to find where to do the simple fix. Link to comment Share on other sites More sharing options...
ray.service Posted February 26, 2015 Report Share Posted February 26, 2015 I have a similar issue. Mine works fine from the dash, but I can only turn the fan down from the bunk, not up. Man, these things have a lot of circuits... Still could be the switch. I believe they are identical so just swap them to try Link to comment Share on other sites More sharing options...
ray.service Posted February 26, 2015 Report Share Posted February 26, 2015 agreed on the priorities but I might open the panel and have a look at the wires there. I am sure it is a simple fix. just need to find where to do the simple fix. I hear that! I've got a bunch of annoying little projects on the truck (and trailer) but with the cold wet weather they can wait til spring. Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 26, 2015 Author Report Share Posted February 26, 2015 Still could be the switch. I believe they are identical so just swap them to try I have tried another switch and it had the same results. The 2nd switch is used so it is possible that the 2nd switch is also malfunctioning. I do have access to a known good switch [as soon as he is back from a trip]. I will try that and see how that works before I tear into the back panel. Link to comment Share on other sites More sharing options...
ray.service Posted February 26, 2015 Report Share Posted February 26, 2015 You can ohm out the switch. Here's the pinout. Link to comment Share on other sites More sharing options...
Jack Mayer Posted February 26, 2015 Report Share Posted February 26, 2015 I have the same issue - it just started - it has been working correctly up till now. As with you guys, it is WAY DOWN on my list. I won't even pull the switches/panels until I'm serious about fixing it. For now, it is "localized control". Link to comment Share on other sites More sharing options...
bmzero Posted February 26, 2015 Report Share Posted February 26, 2015 Here's an option if your dash switch is the problem - http://www.ebay.com/itm/Volvo-VNL-Sleeper-Fan-Blower-Switch-Rocker-Switch-8144321-M266X-/261426351850 For the sleeper, it looks like you have to buy the entire assembly - http://www.ebay.com/itm/2006-VOLVO-TRUCK-VNL-SLEEPER-A-C-AC-HEATER-CONTROL-ASSEMBLY-/351207379243?pt=Motors_Car_Truck_Parts_Accessories&hash=item51c597512b&vxp=mtr Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 26, 2015 Author Report Share Posted February 26, 2015 to bad I am not very skilled with an ohm meter. I am never sure what reading should be. Time for a you tube lesson!!!!! Link to comment Share on other sites More sharing options...
SunJuniper Posted February 28, 2015 Report Share Posted February 28, 2015 depending on the build date on your guys Gen 2 trucks , i SHOULD have all the schematics here if you end up needing them. also got a official Bindered Volvo Gen 2 service manuals. Link to comment Share on other sites More sharing options...
Shallow Draft Posted February 28, 2015 Author Report Share Posted February 28, 2015 thanks lou 10 Link to comment Share on other sites More sharing options...
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