Rear Window Defroster Switch Inspection

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

Remove the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL .)
Inspect for continuity between the rear window defroster switch terminals using an ohmmeter.

Fig 1: Rear Window Defroster Switch Continuity Table
Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Rear Window Defroster Switch Terminal Connectors
Courtesy of MAZDA MOTORS CORP.
Connect battery positive voltage to terminal 3A and ground to the terminal 3D.
Turn the rear window defroster switch on.
Verify that the LED illuminates.
- If not as specified, replace the fan and rear window defroster switch.