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 DIAGNOSISACCESSORIES & EQUIPMENTWARNING SYSTEMSINTUITIVE PARKING ASSIST SYSTEM (DIAGNOSTICS & CIRCUIT TESTS)INTUITIVE PARKING ASSIST SYSTEMCIRCUIT TESTSBACK SONAR SENSOR LH CIRCUITPROCEDURE

2013 Toyota Sequoia Limited, 5.7L Eng VIN W

Back Sonar Sensor LH Circuit: Procedure

2013 Toyota Sequoia Limited, 5.7L Eng VIN WSECTION Procedure

REPLACE BACK NO. 2 ULTRASONIC SENSOR LH
1. Replace the back No. 2 ultrasonic sensor with a normally functioning sensor. Refer to REMOVAL .
NEXT: Go to next step

CHECK HARNESS AND CONNECTOR (BACK SENSOR LH - BACK SENSOR RH)

Disconnect the R4 and R3 back No. 2 ultrasonic sensor connectors.

Fig 1: Measuring Resistance Of Back No. 2 Ultrasonic Sensors LH Harness & Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Condition	Condition	Specified Condition
R4-1 (BI) - R3-2 (BO)	Always	Below 1 Ω
R4-3 (SI) - R3-4 (SO)
R4-5 (EI) - R3-6 (EO)
R4-1 (BI) - Body ground	Always	10 kΩ or higher
R4-3 (SI) - Body ground
R4-5 (EI) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 3

PROCEED TO NEXT SUSPECTED AREA 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.