Before my computer catches on fire, I have searched and cannot find a similar problem with a conclusive answer to my problem. So here it goes...

Last spring the climate control in my FC worked brilliantly. The car sat over the summer and now that I am driving it again, the logicon is completely inoperable.

The temperature slider works and all the buttons push in and out, but none of the logicon lights illuminate and there is absolutely no "blowing" coming out from the dash.

In searching, I found that the cigarette, room, and meter fuse in the driver's kick panel can cause the logicon to not operate. Those three fuses and the two fusible links are good.

Is my logicon simply bad? I don't think the blower is bad, otherwise the logicon would still illuminate, right? So it must be the logicon...

Can someone please point me in the right direction? Thanks guys!

 

Did you + or - anything electrical (i.e. aftermarket) within that same time frame?


-Ted

 

First:

Check the breakers. They are located in the top left and right corners of the kick panel fuse box. The red button is the "reset".

Second:

I've had bad logicons with all the lights still working on them, so thats a bad indicator to use as to whether or not its blown.

Third:

Pull the plug off the blower motor (accessible without ANY disassembly) its on the bottom of the blower motor assembly under the dash on the passenger side. Probe the prongs on the plug with a DMM and check for voltage, if none is present when you have the fan setting on, then your logicon is probably bad - or a relay along the circuit has gone kaput.

 

That was my first thought too. When I last drove the car in the spring, I had installed an SAFCII and a few gauges. Now that I have the car back I went through to check for any problems and the only thing I found was that the cigarette lighter was not plugged in. All other connections are correct.

I am not currently running a CD player and the PO had been using an aftermarket deck. There is an aftermarket wiring harness installed and I checked those wires also. The 12v, switched power, and illumination wires all function properly, but there is one other wire that is also labeled "power." There is no power going to this wire under any circumstances, however I don't know if this would have any bearing on the logicon's functioning.

1. Are referring to the ones labeled "heater" and "defog?" If so, I did check them and they are in working order.

3. There are a couple plugs on the blower. Can you tell me which one it is?




Thanks for the help guys.

 

The plug for the fan motor should be coming out of the bottom of the fan motor itself (the black round thing in the bottom right corner of your pic)

Except, I should actually see the plug, but its not present in your picture, it SHOULD be there though - otherwise, thats the problem

 

Thanks for the help, I will have time to pull that plug tomorrow and see what's up. Just to be sure, I believe we are talking about this plug. It's the only plug in the black round thing...

 

I pulled the plug going into the motor today and it did not read any voltage at all.

I also tried supplying 12v directly to the blower motor hoping it would start putting out some air and nothing happened there either, although I don't know if that is the correct way to test the motor.

I will check out the relays tomorrow/Monday, and also check for voltage going into the logicon.

Is anyone else seeing something here that I am not?

Thanks guys.

 

When my logicon stopped working I just replaced it and havent had a problem since. My blower stopped working at the time. I thought it was the heater core at first.

 

yea when i had my 86 sport my logicon went out and i just popped a new one in and it worked fine, but sounds like your having more problems then i did good luck on it

 

do a search on cold solder. the logicon in my 86 was acting up similar to your's and it was a cold solder issue. works just fine now.

 

I may just look to pop a new logicon in then. That's very promising, thanks guys.

Did you resolder, or just put in a new unit?

 

As long as you're popping in a new logicon anyway, you might as well attempt to resolder your current one. Worst case scenario you poke an electronic chip with your soldering iron and need a new logicon. The FC's dash electronics got a sub-standard soldering job from the factory. You can search for diagrams to tell you which joints to resolder, or you could resolder the whole logicon.

 

resoldered, it's not hard to do.

 

OH BS. See your picture? See the relay with the RED/YELLOW and BLUE/WHITE wires???

Pull the plug off that relay. Jumper a wire b/t those two wires mentioned above. Now turn the key to ON and the fan slider to the right.

The motor should blow at full speed no matter where you put the slider (except full left, but that is common sense).

Fan not work? Remove the fan motor. It's only three small bolts at the bottom. Lefty lucy til the motor falls in your hands. Now jumper 12v to one spade on the fan and a neg to the other. Fan spins or does not spin. No spin? Bad motor, and by the way, you probably fried the transistor on the fan housing while it burnt out. Done.

In the S5 FSM there's a very easy step by step method to figure out what is wrong. The above is NOT in that manual. Why waste time. Just do it.

Helpful hint number one: The Red/Yellow should be *hot*. The Blue/White goes to the fan motor. The gnd should already be at the fan motor if the plug is attached to it.

 

This might not apply to this situation, but i had a similar problem...i went through all the wiring in the interior, removing any wires that were not being used, audio, etc...after reinstalling the dash the blower wasn't working and there were no lights on the logicon....went in again and checked my wiring...turned out I accidentally removed a ground from the harness behind the dash, not along the firewall....everything works like a charm now...like i said, might not apply, but just figured I would throw it out there

 

to who? or to what?

 

Does this hold true for the S4? (N/A)

 

24hrs a day, seven days a week. Red/Yellow should be hot when the slider is moved to the right.......Blue/White is the feed to the fan motor which should have a gnd on it if you don't remove any plugs other than the relay mentioned above.

See page U-11 of the online, free, FSM for the series five. Follow the trail from the fan Red/Yellow backwards.

 

B.S to all the fiddle ******* around trying to find out why the fan does not work and suggesting swapping out parts, soldering parts when there has been no attempt to find out just why the thing does not work. Called Trouble Shooting using the FSM and it's schematics, quite unlike guessing and swapping out parts to fix something.

There was no paticular WHO or WHAT being addressed by the B.S.

 

How do I jumper 12V to something?

 

If we're still talking about getting the fan to work by jumpering the Red/Yellow wire to the Blue/White wire.........see the self explanatory jpg attached.

IF it does not make the fan run, withe the key ON and the slider to the right, then check for the 12v at the Red/Yellow wire. It should be there. If it isn't there, then go to the series five fsm and the pages I attached in another reply above and figure out just why it isn't there. If the 12v is there, either the motor is locked up or the plug is off the motor or the gnd for the motor is detached or???? several other options.