Hi guys, I have a 2010 Honda Accord EX-L w/ 4 cyl & HFL, but no navigation. The key fob is an aftermarket unit. Only one key.

The key fob will not roll down the windows with either holding down the unlock button or key in door handle lock method.

All of my windows and sunroof works. all the buttons on the key fob work except for the roll down feature. My Autel scanner did not pick up any previous or current codes that could associate with my problem.

Is my problem in the key fob or the car itself?

Thank you for any and all help!
- D.C.

 

The problem sounds like an issue with the multiplex integrated control system since turning the key in the door cylinder doesn't operate the windows and moonroof either.

Possibly an issue with one of the following:

• driver's door multiplex control unit (MCU), built into the driver's door master switch
• or the under-dash MICU (Multiplex Integrated Control Unit), which is part of the driver's under-dash fuse/relay box.

Power door lock and power window communications run through the same two B-CAN wires (B-CAN Hi (pink wire) and B-CAN Lo (blue wire) that goes from the driver's door MCU to the under-dash MICU.

 

I understand. I'll have to trace the wires back into the MCU to see if it's getting signal. I appreciate the help.

 

Since the power locks and power windows work, this would indicate it is not an issue with the wires (they communicate through the same wires); but, an issue with the either the driver's door MCU or the under-dash MICU.

 

Is there a way to test which one could be the culprit?