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Discussion Starter · #1 ·
I have a 2001 LX -- we're getting no indicator lights on the heating/cooling control head and it will not switch between vent, defrost, heat, etc. Also recirc and A/C buttons do not work. Front and rear blower motors continue to respond.

The A/C has been dead for awhile (needs a compressor), but we've always been able to blow warm air, select mode, etc.

On a hunch I though that this may be related to a pressure issue on the A/C. I disconnected the pressure switch, jumped terminals 1 & 4 and nothing. Also checked fuses that seemed related to A/C.

Any ideas? A quick search didn't show anything obvious.

Thanks!
Dave
 

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Dave,

Did you check fuse 13 (7.5A) and fuse 10 (15A) in the PASSENGERS side fuse box?

(Just in case you haven't been in that box before, it's on the side-floor panel and has a little hatch that swings open.)

Just thought I'd check since they seem to be a possibility ... and just hoping it's something as simple as a fuse (without some serious underlying reason for it blowing). Sorry if it's a dumb question (since you said you already tried to locate/check fuses related to the climate control).
 

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Discussion Starter · #3 ·
Mem...

I just got everything working and your lead pointed me in the right direction.

Seems that fuse 13 (7.5A) on the passengers side acts as a reset to the control head. I pulled the fuse, let it sit for 30 seconds or so, replaced the same fuse and everything seems to work. I suspect the system may put itself in to a "safe mode" if it detects a pressure issue with the A/C and pulling the fuse resets it. Just a theory.

For others who may be reading, the fuse on my passengers side box is labeled Clock Backup, but it also appears to provide power to the electronics of the LX's climate control.

Thanks!
Dave
 

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Great! Good find that it re-set things for you (and I hope it is not a recurring problem).

Wish I could claim some credit for "pointing you in the right direction" - but of course I was just thinking about checking that fuse 13 and it did not occur to me to try and re-set the electronics by pulling the juice.

The repair manual lists Fuse 13 as protecting the Climate control unit and Heater control panel (along with some minor things like the clock - as well as some things like Keyless entry and Power sliding doors which are not on the LX) - so it was a good candidate. Fuse 10 was not a good candidate, but since "climate control" was listed as one of the things it protects I threw it in...

Anyway, glad you're back in business.

Out of curiosity (if you don't mind), what is the story/history with your compressor?
 

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Discussion Starter · #5 ·
Update --- I thought I was on to something with the "pull the fuse" reset. Today, that approach didn't work. Must be an intermittent connection of some sort.
 

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2000 LX - No Lights

My 2000 LX is having similar problems. Control panel has no lights (no a/c, no vent control, etc.), but the front and rear blower controls work at any speed.

The wife’s van... She said the a/c would be working fine and randomly would stop blowing cold. Blower continued working fine, things just got hot. Upon inspection of the controls, the center console controls would show no lights. After a period of time the lights would reappear and the a/c would begin working again. This on/off interval continued for several weeks, but when we took it in to the shop it always seemed to be working. They suggested waiting until it hard broke as to ease diagnosis efforts.

In many respects it sounds the same as all you EX owners who experience Transistor Assembly issues, but upon inspection under the dash on passenger side it doesn't appear I have the same configuration. (Didn’t find the white connector attached to the part in question, just a much smaller black connector... I don't think they're the same).

Any ideas?
 

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I am having a similar issue to N _Ody with my 2001 LX. What did the problem turn out to be please?
Start the car, blower works fine but no lights and no AC. After the car has been running for a few minutes the AC starts and works fine.
I would greatly appreciate your guidance. Thanks!
 

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I'm seeing the same problem on my 2000 EX. The system just completely shuts off, no lights and no fan (as if the Off button was pushed), randomly while driving. Hitting Auto sometimes gets it going again immediately, but other times I've had to wait a while. Any final resolution from those who have seen this before?

Thanks.
 

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similar symptoms

Definitely having the same issues, no vent control, no ac, no inside outside air control, but fans work in all areas at all speeds and both fuses appear to be seated well with good connections on passenger and driver sides............makes me now curious what these " Transistor Assembly issues" are and if thats my problem as it just looks like the selector buttons are losing power at times (and specifically with the ac a loss in control voltage means the compressor turns off and i get hot air)

Weirdly enough i have much less flickering and more on time when the parking lights or headlights are on...........enough to keep it running for a minute or 2 before kicking off and on again here and there randomly (no bumps or changes in speed change anything)

any ideas or confirmations on where else to look? loose plug behind the controller in the dash and such?
 

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Well as it turns out that fuse on the passenger side does nothing for the climate control unit, unplugged it and all that went out was the clock and my led's on the vent selector and other buttons didnt flicker (again only with the parking lights on and dimmer circuit activated)............so i guess fuse 13 (7.5A) on the passenger side is labeled correctly on the manual climate control box and whatever fuse is there for the auto climate control box does not apply in this case.


I am getting frustrated with my unit and considering buying a used manual climate control module on ebay for around $100......am I about to waste my money and is it even likely the inner circutry is failing, or is there any way to test these units without finding a very understanding friend? lol
 

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ime thinking it might be the blower motor resistor or a relay.... I just read that if the blower motor goes it cuts power to the climate control...most replace the blower motor and its fixed....test those...
 

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in my case i have full blower control on both front and back and intermittent control of vents a/c and rear defroster when the led's are lit, (things that require a constant signal like the a/c and rear defroster turn off when the led's go out and the little console loses power whereas things like the coolant/heater core valve and vent position will stay in the same place without a signal.........so im pretty much good in the winter once i get it set lol but i would like to find a way to confirm the issue with a meter or something before i go throwing parts at it.

found another thread on a similar problem and tried for help there but it requires posting approval and i apparently dont have it haha, but it may or may not shed light on the problem as the person "found" the problem was the console with an intermittent short but never reported that it was fixed to confirm and was still looking for a cheaper price upon last post

http://www.odyclub.com/forums/24-19...o-c-no-console-lights-but-blower-control.html

thanks again for the advice!
 

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Not to beat an old thread but....

I too have a 2000 LX with the same exact climate control symptoms.
The intermittent problem was happening mainly in the summer, then it stopped and continued to work fine. Last week I went to a pull a part and bought two different climate controls for under 40 bucks. No luck, both have the same issues. So either the ones I bought have the same bug, or it is in my electrical system. Seems lots of people have this problem but no one has the cure. Also, I should mention, that on both of the new-to-me climate controls, the light that illuminates the fan speed works intermittently as well and the temperature hot/cold mix light works fine.
 

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Problem Solution

My 2000 Odyssey LX had this same problem, such that the heater/ac switches worked sporadically, and after the problem happening more often, the panel failed completely, with indicator lamps completely dark. I'm a retired electronics technician, and came to this forum seeking info, and decided to share these results.
The heater panel was removed, brought to the workbench, and the gold-colored screws removed, the dark rear panel removed to expose the circuit board. The edge of the circuit board was then pried upwards very carefully, first at one end, then the other, until the circuit board came free from the housing.
Now, at the center area of the board is a small black heatsink, where a 3-terminal TO-220 5 volt regulator is mounted. This regulator is the power supply for the computer circuit
Here's the problem that was found:--approx. 3/4 in. from the heatsink, there is a "via" that carries the input circuit trace from one side to the other. That via is located Exactly under one of the rubber strips that you found there, and was corroded, so that the current could not flow to the regulator. A wire bridge was soldered around that corroded area, and the circuit assembly reassembled. I plugged it back into the van wiring, and took a quick breath..It now works! My experience tells me that that tiny corroded area is the likely problem in the majority of these situations. One caveat-- to repair this problem requires good soldering skills. The circuit traces must have the coating carefully scraped away to expose shiny copper. Check with your local Amateur Radio Club, and find someone willing to help-tell them I sent you. Any questions? I'm willing to respond to [email protected] take awhile for response. boscoradio
 

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ime thinking it might be the blower motor resistor or a relay.... I just read that if the blower motor goes it cuts power to the climate control...most replace the blower motor and its fixed....test those...
This resolved the A/C issue which was only working at high speed, so now that is ok but heater is off, so what might have caused that
 
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