[SASS3220]

The Cruise Control on-off button, and the Set rocker switch, on my '08 MDX, have recently decided to "retire" from active duty! If you push the "on" button, the green light comes on momentarily, but does not activate the system. I haven't been able to locate a "master" fuse for the system, or where the actuator is on the engine. Does anyone know if this is electrical, or vacuum operated?
Thanks for such a GREAT forum!

 

[johny_2000]

This is a completely electronic system. You can diagnose all the buttons with a multimeter or a Honda HDS scanner (my preferred way of doing). Essentially, all the buttons on the steering wheel go to a body Input / Output module called MICU, mounted under the dashboard kick panel on the driver's side.
From there, they are transmitted through the body network (called B-CAN) to the instrument cluster board, which acts as a network gateway between the body network and the drivetrain network (called F-CAN).
The engine control module operates on the F-CAN and receives commands (e.g. cruise control on, off, set, +/-) from the instrument cluster gateway and process them to the throttle body servomotor and other drivetrain components.

In your case, it could be worn clock spring spiral cable on the steering wheel or water ingress into the under-dash fuse/relay module (MICU) that receives and processes the buttons.

In terms of fuses - it's Fuse #7 (10A) in the under-dash fuse/relay module and Fuse #11 (15A) in main under-hood fuse box (small box next to the battery).

 

[SASS3220]

This is a completely electronic system. You can diagnose all the buttons with a multimeter or a Honda HDS scanner (my preferred way of doing). Essentially, all the buttons on the steering wheel go to a body Input / Output module called MICU, mounted under the dashboard kick panel on the driver's side.
From there, they are transmitted through the body network (called B-CAN) to the instrument cluster board, which acts as a network gateway between the body network and the drivetrain network (called F-CAN).
The engine control module operates on the F-CAN and receives commands (e.g. cruise control on, off, set, +/-) from the instrument cluster gateway and process them to the throttle body servomotor and other drivetrain components.

In your case, it could be worn clock spring spiral cable on the steering wheel or water ingress into the under-dash fuse/relay module (MICU) that receives and processes the buttons.

In terms of fuses - it's Fuse #7 (10A) in the under-dash fuse/relay module and Fuse #11 (15A) in main under-hood fuse box (small box next to the battery).

THANK YOU JOHNY! This is most helpful! One day the cruise system was working...the next day it wasn't! Now I know where to start looking.👍