Stereo Component Amplifier 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.
- INSPECT FUSE (RAD NO. 1, RAD NO. 2, ACC)
- Remove the RAD NO. 1 and RAD NO. 2 fuses from the engine room No. 1 relay block, junction block.
- Remove the ACC fuse from the cowl side junction block RH.
- Measure the resistance of the fuses.
Standard resistance: Below 1 Ω
NG : REPLACE FUSE
OK : GO TO NEXT STEP
- CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - BATTERY AND BODY GROUND)
- Disconnect the U29 and U31 amplifier connectors.
- Measure the voltage of the wire harness side connectors.
Standard voltage
TESTER CONNECTION AND SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition U31-1 (+B) - Body ground Always 10 to 14 V U31-10 (+B2) - Body ground Always 10 to 14 V U29-12 (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 CHARTTester Connection Condition Specified Condition U31-16 (GND) - Body ground Always Below 1 Ω U31-15 (GND2) - Body ground Always Below 1 Ω
NG : REPAIR OR REPLACE HARNESS AND CONNECTOR
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE