I33367

Driver Side J/BI18 Ignition SW

J/B No.3 A/C Amplifier

Engine Room R/B

AM1 IG1

LY

WL

2 4

2 7IC IK

IG1 No.2 GR GRL 6 63E 3D GRL

1A13

6WB

2

2

AM12

2

2 1 12

W

AJ23J/C

ILBattery

IG

GND

B

A13ALT

05658DIAGNOSTICS AIR CONDITIONING SYSTEM

832Author: Date:

2003 LEXUS GX470 (RM1006U)

IG POWER SOURCE CIRCUIT

CIRCUIT DESCRIPTIONThis is the power source for the A/C amplifier and servomotor, etc.

WIRING DIAGRAM

055UM03

I33663

GND IG

DIAGNOSTICS AIR CONDITIONING SYSTEM05659

833Author: Date:

2003 LEXUS GX470 (RM1006U)

INSPECTION PROCEDURE

1 CHECK FUSE(IG1 FUSE)

(a) Remove the IG1 No.2 fuse from the driver side J/B.(b) Check that the continuity exists of IG1 fuse.

NG REPLACE FUSE

OK

2 CHECK HARNESS AND CONNECTOR(A/C AMPLIFIER BATTERY)

(a) Remove the A/C amplifier with the connectors being con-nected.

(b) Turn the ignition switch to ON.(c) Measure voltage between terminal IG and GND of the

A/C amplifier.Voltage: 10 14 V

NG REPAIR OR REPLACE HARNESS ORCONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE(See page 05602)