[Jonathan G]

2020 Odyssey EX

Anyone know causes and solutions?Symptoms:

1. Can't use the door lock buttons on driver or front passenger to lock the doors once the van is off. Which means the van is unlocked whenever I leave it.

2. Won't remote start or unlock for either of our keys, even after replacing the battery.

3. Won't even start with push button unless I hold the key fob right over the button (which means it is only responding to RFID).

4. Earlier today, it would not start at all. Replaced the battery. The above symptoms remain.

At this point I’m wondering about blown fuses, door actuator, or central computer, but really have no idea.

Update 8/15 - Actuator in one sliding door now making that annoying spinning/slipping noise and door won’t open manually or automated.
Perhaps of note is that the van had been in the dealer twice for FAKRA replacement and the second time, they broke the connection to the back wiring harness, resulting in a complete gutting of the interior to replacing both wiring harnesses. Could that have led to a ground fault or moisture in any electronic components?

 

[DJVAN]

@Jonathan G
Welcome to the ODY Forum!. As a reminder please when asking a technical question include the year and model number of your ODY to help us help you.

First, their may be a simple answer to your question about the locking/unlocking system on your ODY or there may not be an easy one.
I am including one picture and than some pdf files to help. I would start with the Key FOB first (either Key FOBs) and verify if your key fobs are working correct, which they probably are, this is still a good quick check to do verify communication with the ODY. Open up Keyless Access Remote Removal, Installation, and Test 2018 Honda Odyssey.pdf

The next check would be verifying fuse being good. C38 (20 A) fuse in the under-dash fuse/relay box open
All the doors will not lock or unlock with driver's door key cylinder or
door lock switch or keyless remote.pdf

Next check would be the grounding wire G401 check, it may be harder to find or not. It is possible that you may have a internal water leak causing corrosion on your wires or just one loose screw/bolt holding together several gound wires to your chassis.

The last item could be in your BCM (Body Control Module). Either it is toast or it got saturate with a internal water leak. The ODY does not seem to be immune from this happening but it has mainly happened in the rear end-tailgate cargo area. However some people have reported having water in the front floor level causing damage. If you ODY is under warranty, I would probably take it in for repair. Good luck, hope it's something simple. Note: the pictuer show it's at the steering wheel, actually behind the dash at the steering wheel height.

 

[Jonathan G]

@DJVAN thanks so much for the resources! Warranty is expired

Total brain fart on my part… It’s a 2020 EX. The fobs are fine. There are enough oddities going on that I’m thinking it’s the BCM. But I’m going to open your docs first and see what shakes out before laying out cash. Fingers crossed it’s a fuse!

Again, big thanks for taking the time to share your thoughts and resources!

 

[DJVAN]

@Jonathan G
You're very welcome!

 

[Jonathan G]

Update: Power sliding doors aren’t power sliding. 🫠