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
R3-5 (TX+) - S23-6 (TDX+)	Below 1 Ω
R3-15 (TX-) - S23-19 (TDX-)	Below 1 Ω
R3-5 (TX+) - Body ground	10 kΩ or higher
R3-15 (TX-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE OR DIAGNOSTIC TROUBLE CODE CHART