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 MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTWARNING SYSTEMSPARK ASSIST / MONITORINGINTUITIVE PARKING ASSIST SYSTEMBACK SONAR SENSOR RH CIRCUITINSPECTION PROCEDURE

2009 Toyota Sequoia Limited, 5.7 Y, RWD

Inspection Procedure

2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Inspection Procedure

REPLACE BACK NO. 2 ULTRASONIC SENSOR RH
1. Replace the back No. 2 ultrasonic sensor with a normally functioning sensor (See REMOVAL ).

CHECK HARNESS AND CONNECTOR (BACK SENSOR RH - REAR CORNER SENSOR RH)

Disconnect the R3 back No. 2 ultrasonic sensor connector.
Disconnect the R2 rear corner No. 1 ultrasonic sensor connector.

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

Standard Resistance

STANDARD RESISTANCE

Tester Condition	Condition	Specified Condition
R3-1 (BI) - R2-2 (BO)	Always	Below 1 Ω
R3-3 (SI) - R2-4 (SO)
R3-5 (EI) - R2-6 (EO)
R3-1 (BI) - Body ground	Always	10 kΩ or higher
R3-3 (SI) - Body ground
R3-5 (EI) - Body ground

Reconnect the back No. 2 ultrasonic sensor connector.
Reconnect the rear corner No. 1 ultrasonic sensor connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 1: Identifying R3 Back No. 2 Ultrasonic Sensor Connector And R2 Rear Corner No. 1 Ultrasonic Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See 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.