Prelude Models

Turn main light switch to "ON" position. With harness connector installed, connect voltmeter positive probe to terminal "A" (Red) and negative probe to terminal "B" (Black). Turn controller adjustment knob. If voltage readings vary as control knob is turned, brightness controller is operating normally. See Fig 1 .

Fig 1: Dash Mounted Controller Terminal Identification

Courtesy of AMERICAN HONDA MOTOR CO., INC.