HONDA CR-V: 2000
Alright guys and girls, I've got a pretty strange one for you. This one is giving me a fit and I'm coming to you already armed with a 1,395 page Honda CR-V service manual and plenty of know-how as far as diagnostics go but I'm flat out stumped on this one.
Symptoms...yea, two of em.
1) Blower Motor only works on high(I know what you're thinking...)
2) A/C compressor and fans do not come on...period.
Start off with 1)Blower Motor Speed deficiency. You're probably thinking power transistor module. Well I am on the 3rd one, swore it was that from the testing and research I've done but after installing the 3rd Honda genuine part I'm now presented with 2 options. It's not the Power transistor module causing the issue, or whatever is causing this problem instantly fries the power transistor module so scratch out replacing the power transistor module because I've done it twice already with brand new Honda parts and that didn't fix it, what are the chances of that? Slim.
2) A/C compressor and fans do not come one.
All relays for the entire system check out.
I've ran the associated tests and really, the two options as possible fixes from the flow charts I followed in the service manual are...apparently the correct fix. That is, to replace the heater control panel AND the PCM. Tricky eh?
Riddle me this, why would I be getting voltage at the PCM #17 terminal(Blk/Red wire going from PCM to Compressor relay inductor) with A/C turned both on AND off yet the relay is not energized(Nevermind the other side of the inductor that is a Key-on hot blk/yellow wire) You'd think with voltage at both ends of the inductor the relay would be tripped thus turning on the compressor...NOT. The manual says if you ARE getting voltage at this terminal then perhaps the PCM needs to be replaced but for me, that's contradictory. It's basic electricity...if 12V is flowing through an inductor on a relay that is normally open...when that 12V is energizes the inductor it closes the relay switch and thus feeds 12V to the compressor which isn't happening.
Like I said, I'm friggin lost. I have to say, this system is extremely over-engineered. For crying out loud, basic switches and relays have worked blower speed and AC compressor activation for years. Honda had to goof it up and make it just about impossible to fix by yourself by integrating them into the friggin powertrain control module and a heater control panel that is more complex than an old Packard Bell.
I was thinkin it's the heater control panel so I replaced that with a used one but that didn't fix it so I put the old one back in. The used one may have the same problem but c'mon...how realistic is that? So far I don't have A/C or a blower motor that works worth a damn and my dash has been gutted for about 6 months working on this in my spare time. WHAT THE F?
Thank you very much....if anyone wants, perhaps for sparing your knowledge and expertise I could maybe send you the service manual if that would at all benefit you. I try