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DI-747
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3FL-04
Back Up Power Source Circuit
CIRCUIT DESCRIPTION
This is the back up power source for the A/C control assembly. Power is supplied even when the ignition
switch is off and is used for diagnostic trouble code memory, etc.
WIRING DIAGRAM
Driver Side J/B No. 1 J18 J6 A/C control assembly
J/C J/C
3 10 12
A A A A
1W 1V C11 B
R R G-Y
W-R Engine Room J/B No. 2
3 DOME SHORT PIN 3
2J 2B
W
FL MAIN
Battery
I21120
INSPECTION PROCEDURE
1 Check DOME fuse.
Engine Room J/B No. 2 PREPARATION:
Remove DOME fuse from engine room J/B No.2.
CHECK:
Check continuity of DOME fuse.
DOME Fuse
OK:
Continuity
NG Check for short in all the harness and compo-
I04416
nents connected to the DOME fuse (See at-
tached wiring diagram).
OK
2001 SIENNA (RM787U)
Author : Date : 901
DI-748
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check voltage between terminal +B of A/C control assembly connector and body
ground.
PREPARATION:
+B
Remove the A/C control assembly with connector still con-
nected.
CHECK:
Measure voltage between terminal +B of A/C control assembly-
connector and body ground.
OK:
(+) (-) Voltage : 10 - 14 V
I21001
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-697 ).
NG
Check and repair harness and connector between A/C control assembly.
2001 SIENNA (RM787U)
Author : Date : 902
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