Terminal H Inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Measure the wave pattern of panel light control switch terminal H using a tester.
Turn the light switch to the TNS or ON position.
Verify that the resistance changes smoothly while turning the panel light control switch from the brightest to the darkest setting.

Fig 1: Measuring Wave Pattern Of Panel Light Control Switch Terminal H
Courtesy of MAZDA MOTORS CORP.