Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA1991929 BASEREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICTESTINGBLOWER SWITCH
1991 Mazda 929 Base
Blower Switch
1991 Mazda 929 BaseSECTION Blower Switch
- Turn ignition on. Connect voltmeter positive lead to terminal A9 and negative lead to terminal A17 of control unit connector "A". See Figure and Fig 1 .
- With blower switch off, voltage should be zero. As blower switch is gradually increased toward MAX position, voltage should gradually increase to 5 volts.
- Move positive lead to terminal A4. About 5 volts should be present. If voltage is not as specified, replace A/C control unit.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.