Car locks but do not unlock?

JAVERE7

MEMBER
2011 HONDA CIVIC
2.0L
4 CYL
2WD
MANUAL
87,000 MILES

Hi, I have a fn2 type R, I bought the car with this problem where the door lock switch wont unlock the car but only locks. The remote only locks the car also but do not unlock, pressing the unlock button only disarms the factory alarm system. I ordered new door lock actuators for both doors (coupe) but still the same problem. Checked the fuses also.

Thursday, August 7th, 2025 AT 7:02 AM

3 Replies

STEVE W.

MECHANIC
15,233 POSTS

As it is working one way and responds to the remote with disabling the alarm we know it has power and the wiring is okay because all of the same parts are used for lock or unlock. In operation it simply reverses the polarity in the wires to move the actuator. That is done inside the Multiplex Integrated Control Unit (basically a smart fuse box with body control functions) using the internal relays. The internal parts are not replaceable, you replace the complete MICU then you use a scan tool to register the replacement in the vehicle so the immobilizer doesn't stop the engine from running. The problem will likely be sourcing a replacement part.

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Thursday, August 7th, 2025 AT 11:00 AM

JAVERE7

MEMBER
2 POSTS
2011 HONDA CIVIC
2.0L
4 CYL
2WD
MANUAL
87,000 MILES

I bought this car with this problem where the door lock switch doesn’t unlock the car but only locks it. With the remote it only locks the car and disarms the factory alarm when pressing the unlock buttons. I ordered new door actuator but the problem is still there. I also already checked the fuse.

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Saturday, August 9th, 2025 AT 12:32 PM (Merged)

STEVE W.