Radio Receiver Power Source Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Radio Receiver Power Source Circuit - Wiring Diagram

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INSPECT FUSE (RAD NO. 3, ACC)
1. Remove the RAD NO. 3 fuse from the cowl side junction block LH.
2. Remove the ACC fuse from the cowl side junction block RH.
3. Measure the resistance of the fuses.
  Standard resistance: Below 1 Ω
NG : REPLACE FUSE

OK : GO TO NEXT STEP

CHECK WIRE HARNESS (RADIO ASSEMBLY - BATTERY AND BODY GROUND)

Disconnect the K54 receiver connector.

Measure the voltage of the wire harness side connector.

Standard voltage

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
K54-1 (B) - Body ground	Always	10 to 14 V
K54-11 (ACC) - Body ground	Engine switch on (ACC)	10 to 14 V

Measure the resistance of the wire harness side connector.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
K54-20 (GND) - Body ground	Always	Below 1 Ω

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 2: Identifying K54 Receiver Connector Terminals

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