Driver's Door switch is not recognized by the vehicle's electronics

Tiny
TUKZ86
  • MEMBER
  • 2004 HONDA ACCORD
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 160,000 MILES
When the driver's door is opened, the gauge cluster still shows that the door is closed. I swapped the actuator with on the body from the driver's door with that of the rear passenger's door, and the gauge cluster shows/picks up that the rear door is open, but still shows the driver's door as closed, indicating that the problem is not with the switch itself, but somewhere else.

I found this website because of this link below, which especially shows the Under Dash Fuse/Relay Box.

https://www.2carpros.com/questions/remote-power-locks

How can I reset either the Control Unit, or figure out exactly which wire may be the issue, and most importantly, how to fix it?

Awaiting your response...
Tuesday, July 5th, 2022 AT 11:12 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,492 POSTS
There is a green wire you must check the connection for to the MICU which is behind the left kick panel, if okay it sounds like the MICU or driver's door module-door multiplex control unit (window switch) might be out. Here are the wiring diagrams for the door locks and open warning system so you can see how the system works. I CAN scan might pick up what the problem is as well. here is a guide to help:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Check out the diagrams (below). Please let us know what happens.
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Wednesday, July 6th, 2022 AT 7:08 PM
Tiny
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Hi Ken, thanks for your speedy response. I will get a Circuit Tester Light, and will have a look at that green wire for continuity, then will inform you if I win.

Thank you
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Thursday, July 7th, 2022 AT 12:19 AM
Tiny
KEN L
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Please let us know what you find. We are interested to see what it is.
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Friday, July 8th, 2022 AT 3:41 PM
Tiny
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Hi Ken, I'm still struggling with locating the MICU. So, firstly my car is RHD (in South Africa), and while that won’t really matter as the wires are the same colors as those on your diagrams, the challenge is in locating the actual plug in the MICU that is specifically for the door switches. Basically, it seems like the plug is actually behind the entire fuse panel!

As such, the plan would be to remove the three bolts holding the fuse panel and check the rear. Not an easy job though, because all those wires hold the panel pretty rigidly, meaning having to unplug some just to get to the back of the panel. Will keep trying though...

Regards.
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Saturday, July 9th, 2022 AT 5:54 AM
Tiny
KEN L
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MICU is inside the fuse panel; you must replace the fuse box unit. Check out the diagrams (below). Please let us know what you find.
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Saturday, July 9th, 2022 AT 12:39 PM
Tiny
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Oh... Umm, well okay, I thought a mere resoldering of a wire maybe or some sort of reset would do. Well, if it requires replacing, then I guess removing it isn’t unavoidable. I’ll look into sourcing a replacement unit before removal.

Thanks Ken, and yeah, I’ll let you know.
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Sunday, July 10th, 2022 AT 1:54 PM
Tiny
KEN L
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You might be able to take it apart and find the problem, a burnt-up transistor etc.
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Monday, July 11th, 2022 AT 9:55 AM
Tiny
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Yeah, that also is possible. Look, I'll see if I can take it out though. From when I tried over the weekend, it won't be easy. Reinstallation will be even harder to pull off.

At this point, I'm thinking to either live with the problem, or possibly even "swap" the rear Right door switch wire with that of the driver's door. Yes, the MICU will still assume the rear door is open when I actually have the Drivers door open, but at least it's less likely to lock itself again and subsequently lock the car key in the car!

Oh, and obviously I still need to attempt the iCan Scanner to see if it will pick something up.
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Monday, July 11th, 2022 AT 9:32 PM
Tiny
KEN L
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Good call, I didn't think of that, I like it. Let me know if it works. :)
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Tuesday, July 12th, 2022 AT 11:05 AM
Tiny
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Will do.
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Tuesday, July 12th, 2022 AT 9:40 PM

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