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.
Blower Motor Works Only In Max High
1991 Mazda 929 BaseSECTION Blower Motor Works Only In Max High
- Perform POWER TRANSISTOR test under TESTING. If power transistor is okay, check continuity between ground and power transistor connector terminal 102. See Fig 1 .
- If there is no continuity, repair harness. If continuity exists, check continuity between power transistor connector terminal B12 and control unit connector terminal B12. See Figure and Fig 1 .
- If there is no continuity, repair harness. If continuity exists, check continuity between power transistor connector terminal B11 and control unit connector terminal B11. If there is no continuity, repair harness. If continuity exists, perform BLOWER SWITCH test under TESTING.
RENDER: 1.0x
NO RELATED
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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.