Testing Climate Control Unit for MX-5 Miata (2001)
Heated Glass Element Switch: Testing and Inspection
Rear Window Defroster Switch
1. Remove the climate control unit.
2. Inspect for continuity between the rear window defroster switch terminals using an ohmmeter.
3. Connect battery positive voltage to terminal 3A and ground to the terminal 3D.
4. Turn the rear window defroster switch on.
5. Verify that the LED illuminates.
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If not as specified, replace the fan and rear window defroster switch.