Lexus SC300 / Lexus SC400. Manual — part 28
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the air conditioner control assembly (contains the A/C control assembly)
and servomotor, ect.
DIAGNOSTIC CHART
WIRING DIAGRAM
Check voltage between terminals IG+ and E
of air conditioner control assembly
connector.
Check continuity between terminal E of air
conditioner control assembly and
body ground.
Check HTR fuse.
Check harness and repair and connector be-
tween air conditioner control assembly and
battery
Proceed to next circuit inspection
shown on matrix chart (See page
Check for short in all the harness
and components connected to
the HTR fuse (See attached wir-
ing diagram).
Repair or replace harness or
connector.
AC–70
–
AIR CONDITIONING SYSTEM
Troubleshooting
Check voltage between terminals IG+ and E of air conditioner control
assembly connector.
(1)
Remove console upper panel.(See page
).
(2)
Remove A/C control assembly with connec–
tors still connected.
(3)
Turn ignition switch ON.
Measure voltage between terminals IG+ and E of air
conditioner control assembly.
Voltage:
10 –14 V
Proceed to next circuit inspection shown on matrix
chart (See page
AC-36
).
Check continuity between terminals E of air conditioner control assem-
bly and body ground.
Measure resistance between terminals E of air condi-
tioner control assembly and body ground.
Resistance:
1
or less
Repair or replace harness or connector.
Remove HTR fuse from J/B No. 1.
Check continuity of HTR fuse
Continuity
Check HTR fuse.
Check for short in all the harness and
components connected to the HTR fuse
See attached wiring diagram).
Check and repair harness and connector between air conditioner control assembly and battery.
INSPECTION PROCEDURE
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–71
ACC Power Source Circuit
CIRCUIT DESCRIPTION
This circuit supplies power to the air conditioner control assembly (contains the A/C control assembly).
DIAGNOSTIC CHART
WIRING DIAGRAM
Check voltage between terminals ACC of air
conditioner control assembly connector
and body ground.
Check RADIO No. 2 fuse.
Check and repair harness and connector
between air conditioner control assembly
and battery.
Proceed to next circuit inspection
shown on matrix chart (See page
Check for short in all the harness
and components connected to
the RADIO No. 2 fuse (See
attached wiring diagram).
AC–72
–
AIR CONDITIONING SYSTEM
Troubleshooting
Check voltage between terminals ACC of air conditioner control
assembly connector and body ground.
(1)
Remove console upper panel.(See page
(2)
Remove A/C control assembly with connec–
tors still connected.
(3)
Turn ignition switch ON.
Measure voltage between terminals ACC of air
conditioner control assembly connector and body
ground.
Voltage:
10 – 14 V
Proceed to next circuit inspection shown on matrix
chart (See page
).
Check RADIO No. 2 fuse.
Remove RADIO No. 2 fuse from J/B No. 1.
Check continuity of RADIO No. 2 fuse.
Continuity.
Check for short in all the harness and
components connected to the RADIO No. 2
fuse (See attached wiring diagram).
Check and repair harness and connector between air conditioner control assembly and battery.
INSPECTION PROCEDURE
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–73
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