Terminal C Inspection

Measure the wave pattern of the terminal C on the panel light control switch using an oscilloscope.
Set the headlight switch to either the TNS or headlight position.

Fig 1: Inspecting Panel Light Control Switch
Courtesy of MAZDA MOTORS CORP.
Set the panel light control switch to the brightest position.

Fig 2: Checking For Pattern (1 Of 2)
Courtesy of MAZDA MOTORS CORP.
Verify that the pattern on the screen is as shown in the figure.
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: Checking For Pattern (2 Of 2)

Courtesy of MAZDA MOTORS CORP.