Terminal C Inspection

Measure the wave pattern of the terminal C on the panel light control switch using an oscilloscope.

Fig 1: Measuring Wave Pattern Of Terminal C On Panel Light Control Switch Using Oscilloscope
Courtesy of MAZDA MOTORS CORP.
Set the headlight switch to either the TNS or headlight position.
Set the panel light control switch to the brightest position.
Verify that the pattern on the screen is as shown in the figure.

Fig 2: Identifying Wave Pattern Of Terminal C (Brightest Position)
Courtesy of MAZDA MOTORS CORP.
Verify that the pattern on the screen matches the pattern shown in the figure as the panel light control switch is gradually turned to the darkest position.

Fig 3: Identifying Wave Patterns Of Terminal C (Darkest Position)
Courtesy of MAZDA MOTORS CORP.