Brake Fluid Level Switch Test

WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

Check for continuity between the terminals (1) with the float in the down position and in the up position.

Remove the brake fluid completely from the reservoir. With the float down, there should be continuity.
Fill the reservoir with brake fluid to the MAX (upper) level (A). With the float up, there should be no continuity.

Fig 1: Checking Continuity Between Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.