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 MANUALSTOYOTA2001HIGHLANDER 2WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISDIAGRAMSELECTRICAL DIAGRAMSHEATING AND AIR CONDITIONINGSYSTEM DIAGRAMSERVICE HINTSSERVICE HINTS SYSTEM
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)
Service Hints System
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)SECTION Service Hints System
AIR CONDITIONING (AUTOMATIC A/C)
A3 A/C DUAL PRESSURE SW
1 - 4 : Open with the pressure less than 2.0 kg/sq.cm (28 psi, 196 kPa) or above 32 kg/sq.cm (455 psi, 3138 kPa)
A10 A/C CONTROL ASSEMBLY
12 - GROUND : Always approx. 12 volts
2 - GROUND : Approx. 12 volts with the ignition SW at ON position
11 - GROUND : Always continuity
AIR CONDITIONING (MANUAL A/C)
A3 A/C DUAL PRESSURE SW
1 - 4 : Open with the pressure less than 2.0 kg/sq.cm (26 psi, 196 kPa) or above 32 kg/sq.cm (455 psi, 3138 kPa)
A10 A/C CONTROL ASSEMBLY
11 - GROUND : Always continuity
2 - GROUND : Approx. 12 volts with the ignition SW at ON position
12 - GROUND : Always approx. 12 volts
B8 BLOWER RESISTOR
1 - 3 : Approx. 0.22 Ohms
1 - 2 : Approx. 0.69 Ohms
1 - 4 : Approx. 1.69 Ohms
B5 BLOWER SW
8 - 1 : Continuity with the blower SW at LO, M1, M2 or HI position
6 - 1 : Continuity with the blower SW at M1 position
5 - 1 : Continuity with the blower SW at M2 position
4 - 1 : Continuity with the blower SW at HI position
A3 A/C DUAL PRESSURE SW
1 - 4 : Open with the pressure less than 2.0 kg/sq.cm (28 psi, 196 kPa) or above 32 kg/sq.cm (455 psi, 3138 kPa)
A10 A/C CONTROL ASSEMBLY
12 - GROUND : Always approx. 12 volts
2 - GROUND : Approx. 12 volts with the ignition SW at ON position
11 - GROUND : Always continuity
AIR CONDITIONING (MANUAL A/C)
A3 A/C DUAL PRESSURE SW
1 - 4 : Open with the pressure less than 2.0 kg/sq.cm (26 psi, 196 kPa) or above 32 kg/sq.cm (455 psi, 3138 kPa)
A10 A/C CONTROL ASSEMBLY
11 - GROUND : Always continuity
2 - GROUND : Approx. 12 volts with the ignition SW at ON position
12 - GROUND : Always approx. 12 volts
B8 BLOWER RESISTOR
1 - 3 : Approx. 0.22 Ohms
1 - 2 : Approx. 0.69 Ohms
1 - 4 : Approx. 1.69 Ohms
B5 BLOWER SW
8 - 1 : Continuity with the blower SW at LO, M1, M2 or HI position
6 - 1 : Continuity with the blower SW at M1 position
5 - 1 : Continuity with the blower SW at M2 position
4 - 1 : Continuity with the blower SW at HI position
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.