Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 acsy ciblower
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DI-765
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI7SL-02
Blower Motor Circuit (Front A/C)
Blower Level CIRCUIT DESCRIPTION
The blower motor is operated by signals from the A/C control
HI
assembly. Blower motor speed signals are transmitted by
M2 changes in the Duty Ratio.
Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
M1
For example, if A is the period of continuity in one cycle, and B
LO
is the period of non-continuity, then.
0 30 43 67 100
Si duty (%)
A
Duty Ratio = x 100 (%)
A+B
A
ON
OFF B
1 cycle
WIRING DIAGRAM
B3 B7 A/C control assembly
Blower Motor Blower Motor Liner Controller
3
BR 1 2 4 2
From A24 BLW
Heater Relay B-W B-Y
BR 3 1
W-B
IJ
I21113
2001 SIENNA (RM787U)
Author : Date : 919
DI-766
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check blower motor.
2 1 PREPARATION:
Remove blower motor (See page AC-56 ).
CHECK:
Connect positive (+) lead connected to terminal 2 of blower mo-
tor connector, negative (-) lead to terminal 1.
OK:
Blower motor operates smoothly.
I07839
NG Replace blower motor.
OK
2 Check harness and connector between battery and blower motor linear control-
ler, blower motor and body ground (See page IN-31 ).
NG Repair or replace harness or connector.
OK
3 Check harness and connector between blower motor linear controller and A/C
control assembly (See page IN-31 ).
NG Repair or replace harness or connector.
OK
2001 SIENNA (RM787U)
Author : Date : 920
DI-767
DIAGNOSTICS - AIR CONDITIONING SYSTEM
4 Check A/C control assembly (See page IN-31 ).
NG Replace A/C control assembly.
OK
Replace blower motor linear controller.
2001 SIENNA (RM787U)
Author : Date : 921
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