My daughter has a 2013 Base. Her passenger side low beam stopped working, so I figured bulb went out. Replaced both bulbs and tested, but still no good. Switched to high beams, and the drivers side worked fine, but the passenger side was very dim, almost like DRL mode. She also mentioned that her AC is not working. I confirmed that it does not appear that the compressor clutch is engaging when AC switch is turned on.. Final thing that we noticed is that the DRLs are not working at all. Drivers side headlight, both low and high, work just fine. Checked all fuses and they are good. Thoughts?

 

That's a lot of questions, let me try to answer them all.

-The AC compressor clutch relay is far removed from headlights, so I'm going to ignore it for a while.
You say you checked fuses and they looked good but did you try swapping like for like with a nearby circuit and verify the problem is still there? Fuse might look fine but doesn't carry amperage anymore. I lost fuse 24 once like that after an aftermarket horn install. It still tested positive but wouldn't hold current when applied in the car.

-I'll link a fuse box diagram for what's under the dashboard at the bottom just in case you don't have one handy.
-This is the location of the under hood relay for the AC compressor. I lost my compressor relay last June, fans would cycle but the compressor wouldn't kick on. Direct amperage would turn the compressor on, and once the relay was replaced AC functionality was normal. This is a pretty common failure on older fits.


-https://www.autogenius.info/honda-fi...e-box-diagram/

Finally, you may need to consider rodent damage. Honda (and a shitload of other companies) are using soy based wire insulation, and that's pretty edible for rodents.

 

I would just recuse myself and step back and be unhelpful because that is a cornucopia of issues that only may or may not be related.
My only suggestion is that I would maybe approach each issue separately. Maybe starting with the headlights. You could discover the problems are all related, but for a starting point, the headlights are potentially the easiest.

 

Thanks. Yes, I am assuming that the AC compressor and lights are 2 different issues and figured that it was probably the AC relay based on reading through other threads. Being that they were all power related, I just wanted to make sure that someone did not think that maybe they were, i.e. they all share a common ground (literally, not figuratively). I did look around for rodent damage as that was definitely one thought, but did not dig too deep yet (and it was dark out). Hope to tackle it this weekend, but that is interesting on a fuse checking good, but still dragging down the circuit. Would have to be multiple fuses though since the DRL, the low beam and the high beams are all being affected on that one headlight. Did not seem likely, but I guess possible.

 

So I spent about 4 hours last weekend trying to trace down the issue with the headlights. Tore all sorts of stuff apart, checked fuses, checked connections, checked everything I could and finally gave up. In the end, I ran 3 wires across the front of her car since the driver's headlight (DRL, low and high) are working as designed and spliced into the passenger's side. But to me, this is just a temporary fix. I really want to find the root cause. Also, the DRL idiot light on the dash is now lit up during normal driving.

I searched all over the internet for a wiring diagram and had no luck. In the end, I decided to order a Haynes manual which promised a wiring diagram.

Since the DRL light came on, I figured that there must be something controlling the DRL's so I searched for DRL modules, controllers, etc. Went through all the online parts manuals that the Honda dealerships have to see if something would come up and came up blank.

Received the Haynes manual yesterday and started color coding the various circuits so they would be easier to follow. Clearly Haynes did not do a good job with their wiring diagram (see below)

, but it does confirm that there is a DRL Control unit. So on Sunday, I plan on spending more time on this, but was hopeful that someone had a) a factory wiring diagram or b) some idea of where the mystery DRL controller is located.