Honda odyssey SMS light is on what it stand for

SOURCE: 2003 Honda Odyssey Brake light replacement

open the rear hatch. Between the tail light housing and the rear hatch opening there is a trim strip with two flush fitted flap doors. Insert a small straight blade screwdriver into the small slot on the tail light side of the flap. Pry gently inboard and the small flap will open (the hinge side of the flap is on the side of the rear hatch opening.) Now you can remove the screws that hold the tail lamp assembly in place. Finally, there is still a "spear point" clip that fits into a socket near the front outboard corner of the assembly. Gently pry with a tape wrapped screwdriver (avoids scratches) and force the assembly straight back. The clip should release and free the assembly so you can change the bulb(s).

SOURCE: 96 honda odyssey abs light stays on sometimes but

I would think if it is a amber brake light its a sensor that read the rotor on your cv axle near behind the brake housing..

SOURCE: 2000 Honda Odyssey - TCS Light stays on.

most likely some of your traction sensors are faulty

SOURCE: door ajar light stays on for passenger side

pin switch bad that tells the car door is shut

SOURCE: honda odyssey engine light stay on

If the light was flashing when it came on, then it means your engine is misfiring.

A solid light can mean anything from a loose/faulty gas cap to a transmission issue.

This light comes on when the computer detects a fault of some sort in its diagnostic tests. If it keeps detecting this issue, the light will remain on. If the light turns off, then it has detected that the issue may no longer be present.

In order to find out what the exact reason was for your light, You need to have your car computer scanned to retrieve the code that the computer would have stored when the light triggered. Most garages will do this free of charge. The code will tell you what may have caused the light to initially turn on.