Mode switch

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Remove the climate control unit.
Inspect for continuity between the mode switch terminals using an ohmmeter.
- If not as specified, replace the climate control unit.
  
  Fig 1: Mode Switch Continuity Chart
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Circuit Diagram Mode Switch
  Courtesy of MAZDA MOTORS CORP.

Verify that the resistance between the terminals of the mode switch is as shown in the table.

If not as specified, replace the mode switch.

MODE SWITCH TERMINAL RESISTANCE CHART

Terminals	Resistance (ohm)
Terminals	VENT	BI-LEVEL	HEAT	HEAT/DEF	DEFROSTER
A-B	0	2.48	4.96	7.44	9.92
B-D	9.92	7.44	4.96	2.48	0