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 MANUALSTOYOTA2013SEQUOIA LIMITED, 5.7L ENG VIN WREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAIR CONDITIONING SYSTEM (DIAGNOSTIC CODES & CIRCUIT TESTS)AIR CONDITIONING SYSTEMCIRCUIT TESTSECU POWER SOURCE CIRCUITPROCEDURE

2013 Toyota Sequoia Limited, 5.7L Eng VIN W

ECU Power Source Circuit: Procedure

2013 Toyota Sequoia Limited, 5.7L Eng VIN WSECTION Procedure

INSPECT FUSE (A/C)

Remove the A/C fuse from the main body ECU.

Fig 1: Identifying A/C Fuse & Main Body ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
A/C fuse	Always	Below 1 Ω

Reinstall the A/C fuse.

NG → REPLACE FUSE

OK: Go to next step

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY, BODY GROUND)

Fig 2: Identifying Harness And Connector (Air Conditioning Amplifier)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the H24 and H67 air conditioning amplifier connectors.

Measure the resistance and voltage according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
H24-14 (GND) - Body ground	Always	Below 1 Ω
H67-20 (RGND) - Body ground	Always	Below 1 Ω

Standard Voltage

Tester Connection	Condition	Specified Condition
H24-21 (B) - Body ground	Always	11 to 14 V
H67-24 (+B2) - Body ground	Always	11 to 14 V

Reconnect the air conditioning amplifier connectors.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 3

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE

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.