2006 Honda Accord MICU replacement
Thread Starter
Joined: Jul 2024
Posts: 11
2006 Honda Accord EX 2.4 having weird door lock and security issues
Fob will lock all 4 doors.
Fob will only unlock drivers door.
Manual button will lock and unlock all 4 doors.
If you leave 3 doors locked but drivers door unlocked and open the drivers door the alarm goes off.
If you manually unlock all 4 doors and open drivers door the alarm does not go off.
If you unlock with the fob, get in and drive, all 4 locks cycle lock/unlock twice each.
I replaced the MCU (master door switch) and didn’t fix it.
Unplugged the connector in the door jam but don’t know which pins to test nor what to look for.
I did have an issue last year with the sunroof drain in drivers side front corner stopped up and sending water down behind the fuse panel.
I’ve read that the MICU is built into that fuse panel.
Im thinking I need to replace the fuse panel with the built in MICU but I don’t know how hard of a job it is and/or will the new fuse panel need to be programmed. Is there a eprom chip on that panel that will need to be programmed with the original data from the original panel?
This is a tough one, need help guys!
Fob will only unlock drivers door.
Manual button will lock and unlock all 4 doors.
If you leave 3 doors locked but drivers door unlocked and open the drivers door the alarm goes off.
If you manually unlock all 4 doors and open drivers door the alarm does not go off.
If you unlock with the fob, get in and drive, all 4 locks cycle lock/unlock twice each.
I replaced the MCU (master door switch) and didn’t fix it.
Unplugged the connector in the door jam but don’t know which pins to test nor what to look for.
I did have an issue last year with the sunroof drain in drivers side front corner stopped up and sending water down behind the fuse panel.
I’ve read that the MICU is built into that fuse panel.
Im thinking I need to replace the fuse panel with the built in MICU but I don’t know how hard of a job it is and/or will the new fuse panel need to be programmed. Is there a eprom chip on that panel that will need to be programmed with the original data from the original panel?
This is a tough one, need help guys!
Thread Starter
Joined: Jul 2024
Posts: 11
2006 Honda Accord EX 2.4 having weird door lock and security issues
Fob will lock all 4 doors.
Fob will only unlock drivers door.
Manual button will lock and unlock all 4 doors.
If you leave 3 doors locked but drivers door unlocked and open the drivers door the alarm goes off.
If you manually unlock all 4 doors and open drivers door the alarm does not go off.
If you unlock with the fob, get in and drive, all 4 locks cycle lock/unlock twice each.
I replaced the MCU (master door switch) and didn’t fix it.
Unplugged the connector in the door jam but don’t know which pins to test nor what to look for.
I did have an issue last year with the sunroof drain in drivers side front corner stopped up and sending water down behind the fuse panel.
I’ve read that the MICU is built into that fuse panel.
Im thinking I need to replace the fuse panel with the built in MICU but I don’t know how hard of a job it is and/or will the new fuse panel need to be programmed. Is there a eprom chip on that panel that will need to be programmed with the original data from the original panel?
This is a tough one, need help guys!
Fob will only unlock drivers door.
Manual button will lock and unlock all 4 doors.
If you leave 3 doors locked but drivers door unlocked and open the drivers door the alarm goes off.
If you manually unlock all 4 doors and open drivers door the alarm does not go off.
If you unlock with the fob, get in and drive, all 4 locks cycle lock/unlock twice each.
I replaced the MCU (master door switch) and didn’t fix it.
Unplugged the connector in the door jam but don’t know which pins to test nor what to look for.
I did have an issue last year with the sunroof drain in drivers side front corner stopped up and sending water down behind the fuse panel.
I’ve read that the MICU is built into that fuse panel.
Im thinking I need to replace the fuse panel with the built in MICU but I don’t know how hard of a job it is and/or will the new fuse panel need to be programmed. Is there a eprom chip on that panel that will need to be programmed with the original data from the original panel?
This is a tough one, need help guys!
Super Moderator
Joined: Sep 2006
Posts: 16,331
From: Houston, TX
No reprogramming needed. Just make sure you get the same part number or equivalent. Look up the OEM part number from a site like hondapartsnow.com for your car.
EDIT: Saw your other post, so I copied it on here.
Look, the sunroof leak could have corroded some wires at the MICU/fuse box connector. It isn't a terrible job to access. Just disconnect the battery before working on the electrical stuff. There are also some grounds in that area that could be corroded.
No programming is needed on the MICU. Just make sure you get an identical part number. or an equivalent. Look at the OEM part numbers from a site like hondapartsnow.com.
EDIT: Saw your other post, so I copied it on here.
Look, the sunroof leak could have corroded some wires at the MICU/fuse box connector. It isn't a terrible job to access. Just disconnect the battery before working on the electrical stuff. There are also some grounds in that area that could be corroded.
No programming is needed on the MICU. Just make sure you get an identical part number. or an equivalent. Look at the OEM part numbers from a site like hondapartsnow.com.
Last edited by PAhonda; Jul 25, 2024 at 11:31 AM.
Super Moderator
Joined: Sep 2006
Posts: 16,331
From: Houston, TX
Nothing in the driver's door to test, because the driver's door works properly. I'd recommend getting an OEM shop manual. automanualsource.com has a pdf you can download for ~$22 that will help.
The MICU sends power and ground to all four door locks. I suspect that you have a flaky ground (G501 or G601), corrosion on one the MICU connectors making a faulty connection, or water/corrsion in the MICU, since you had a water leak in that area. Inspect all electrical connectors in that area as well for corrosion. G501 is above the driver's side fuse box. G601 is under the driver's seat. The shop manual will help with the exact location and worth the investment IMO.
The MICU sends power and ground to all four door locks. I suspect that you have a flaky ground (G501 or G601), corrosion on one the MICU connectors making a faulty connection, or water/corrsion in the MICU, since you had a water leak in that area. Inspect all electrical connectors in that area as well for corrosion. G501 is above the driver's side fuse box. G601 is under the driver's seat. The shop manual will help with the exact location and worth the investment IMO.
Thread Starter
Joined: Jul 2024
Posts: 11
Someone responded to me on another thread and I’ve lost the reply. Please message me if it was you.
I replaced tge MCU and it didn’t fix it, but rather it started locking the doors while key wa in the ignition. Locked me out!
I replaced tge MCU and it didn’t fix it, but rather it started locking the doors while key wa in the ignition. Locked me out!
Thread Starter
Joined: Jul 2024
Posts: 11
I returned the MCU and then metered out the black/white wire from the lock actuator to the mcu plug. It tested good. Put it all back together and mysteriously it’s all working fine.
Im sure it’ll be back so if anyone has experienced this issue and found a fix please post!
Im sure it’ll be back so if anyone has experienced this issue and found a fix please post!
Super Moderator
Joined: Sep 2006
Posts: 16,331
From: Houston, TX
I had a similiar problem on my 95 accord where a faulty driver's door actuator caused all the doors to repeatedly lock.
If the door starts locking on its own again, unplug the connector to the actuator on the driver's door to see if the problem stops. If it doesn't stop, try the unplugging the passenger door actuator, then work to the rear doors until you find one that stops the locking. You can use a volt meter on the connector to the door actuator to see if the MICU is sending power and ground to the actuator.
Once you find one actuator that stops the locking, you probably will likely need to replace or possibly repair the actuator. Google search rebuild accord actuator and you'll come across a thread on a drive accord forum where someone describes their DIY fix that is worth a shot.
If the door starts locking on its own again, unplug the connector to the actuator on the driver's door to see if the problem stops. If it doesn't stop, try the unplugging the passenger door actuator, then work to the rear doors until you find one that stops the locking. You can use a volt meter on the connector to the door actuator to see if the MICU is sending power and ground to the actuator.
Once you find one actuator that stops the locking, you probably will likely need to replace or possibly repair the actuator. Google search rebuild accord actuator and you'll come across a thread on a drive accord forum where someone describes their DIY fix that is worth a shot.
