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 MANUALSTOYOTA2006SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGPOWER TRANSISTOR HVACTESTING AND INSPECTION
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
Power Transistor HVAC: Testing and Inspection
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION Testing and Inspection
INSPECTION
1. INSPECT POWER TRANSISTOR
a. Connect the positive (+) lead to terminal 1 through 12 V - 3.4 W test bulb and the negative (-) lead to terminal 4.
b. Check the test bulb lights up when another positive (+) lead is connected to terminal 2 through a 12 V - 3.4 W test bulb.
If operation is not as specified, replace the power transistor.
c. Measure the resistance between terminals 3 and 4
Standard resistance: 2.0 to 2.4 kOhms
If resistance is not as specified, replace the power transistor.
1. INSPECT POWER TRANSISTOR
a. Connect the positive (+) lead to terminal 1 through 12 V - 3.4 W test bulb and the negative (-) lead to terminal 4.
b. Check the test bulb lights up when another positive (+) lead is connected to terminal 2 through a 12 V - 3.4 W test bulb.
If operation is not as specified, replace the power transistor.
c. Measure the resistance between terminals 3 and 4
Standard resistance: 2.0 to 2.4 kOhms
If resistance is not as specified, replace the power transistor.
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.