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 MANUALSLEXUS2010RX 450H 3.5 BREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSAUDIO / VIDEO SYSTEM (W/ NAVIGATION) (DIAGNOSTIC CODES & SYMPTOM TESTS)AUDIO AND VISUAL SYSTEM (W/ NAVIGATION SYSTEM)STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT (FROM 8/2009)PROCEDURE

2010 Lexus RX 450h 3.5 B

Stereo Component Amplifier Power Source Circuit (From 8/2009): Procedure

2010 Lexus RX 450h 3.5 BSECTION Procedure

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

Disconnect the stereo component amplifier assembly connector.

Fig 1: Identifying Stereo Component Amplifier Assembly Connector
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
O18-2 (GND) - Body ground	Always	Below 1 Ω
O18-6 (GND2) - Body ground	Always	Below 1 Ω

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

Standard Voltage

Tester Connection	Condition	Specified Condition
O18-1 (+B) - O18-2 (GND)	Power switch off	11 to 14 V
O18-3 (+B2) - O18-2 (GND)	Power switch off	11 to 14 V

TEXT IN ILLUSTRATION

*1	Front view of wire harness connector (to Stereo Component Amplifier Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 2

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.