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DI-622
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3WA-14
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the A/C control assembly (contains the ECU) and servomotors, etc.
WIRING DIAGRAM
Driver Side J/B Center J/B A/C Amplifier
2 GAUGE 5 9 2 26
1I 1F 3D 3D A31 IG+
B-Y B-Y
B-Y
I14 Engine Room R/B
Ignition Switch AM1
4 2 W
2
IG1 AM1 2 1
W 1 2
2
ALT
Battery J/C
J9
A 16 17 14
3E 3E A31 GND
W-B W-B
Center J/B
IF
I21902
2002 4RUNNER (RM887U)
Author : Date : 798
DI-623
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminals IG and GND of A/C control assembly connec-
tor.
ON PREPARATION:
(a) Remove A/C control assembly with connectors still con-
nected (See page AC-84 ).
GND(-)
(b) Turn ignition switch to ON.
IG(+) CHECK:
Measure voltage between terminals IG and GND of A/C control
assembly.
OK:
BE3840 Voltage : 10 - 14 V
I00356 I00372
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-586 ).
NG
2 Check continuity between terminal GND of A/C control assembly and body
ground.
PREPARATION:
Turn ignition switch to LOCK.
LOCK CHECK:
Measure resistance between terminal GND of A/C control as-
GND(-) sembly and body ground.
OK:
Resistance : Below 1
I00373
NG Repair or replace harness or connector.
OK
2002 4RUNNER (RM887U)
Author : Date : 799
DI-624
DIAGNOSTICS - AIR CONDITIONING SYSTEM
3 Check GAUGE fuse.
PREPARATION:
No. 1 J/B
Remove GAUGE fuse from No. 1 J/B.
CHECK:
Check continuity of GAUGE fuse.
OK:
Continuity exists.
GAUGE Fuse
I09233
NG Check for shot in all the harness and compo-
nents connected to the GAUGE fuse (See page
IN-28 ).
OK
Check and repair harness and connector between A/C control assembly and battery.
2002 4RUNNER (RM887U)
Author : Date : 800
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