Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK WIRE HARNESS (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)

Disconnect the R3 receiver connector.

Fig 1: Identifying R3 Receiver Connector Terminals
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Disconnect the S23 amplifier connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
R3-8 (R+) - S23-11 (R+)	Below 1 Ω
R3-9 (L+) - S23-12 (L+)	Below 1 Ω
R3-18 (R-) - S23-23 (R-)	Below 1 Ω
R3-19 (L-) - S23-24 (L-)	Below 1 Ω
R3-8 (R+) or S23-11 (R+) - Body ground	10 kΩ or higher
R3-9 (L+) or S23-12 (L+) - Body ground	10 kΩ or higher
R3-18 (R-) or S23-23 (R-) - Body ground	10 kΩ or higher
R3-19 (L-) or S23-24 (L-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

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