m_05_0936.pdf

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05–936
DIAGNOSTICS
–
AIR CONDITIONING SYSTEM
05L3M–01
BLOWER MOTOR CIRCUIT
CIRCUIT DESCRIPTION
The blower motor is operated by signals from the A/C amplifier assy. Blower motor speed signals are trans-
mitted by changes in the duty ratio.
Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, A is the period of continuity
in one cycle, and B is the period of non–continuity.
The blower motor controller controls the blower motor speed.
The blower motor controller reads the signal from the A/C amplifier and controls rotation and speed.
Blower Level
HI
M8
M7
M6
M5
M4
M3
M2
M1
LO
Duty Ratio =
A
A+B
A
x 100 (%)
ON
OFF
B
1 cycle
0
26.3 30.9 37.8 44.7 51.6 58.4 65.3
74.5
83.7
100 (%)
SI duty (%)
COROLLA VERSO REPAIR MANUAL (RM1100E)
05–937
DIAGNOSTICS
–
AIR CONDITIONING SYSTEM
WIRING DIAGRAM
B15
Blower Motor Controller
P
2
W–B
1
3
II1
5
II1
P
W–B
Instrument Panel J/B
+B
B
3
1
II1
B
2
DF
B4
Blower Motor
L–B
2
1
To Battery
A
J14
J/C
IK
3
DF
A/C Amplifier
(A/C Control Assembly)
20
A12 BLW
SI
GND
VM
L
4
4
II1
L
I41089
COROLLA VERSO REPAIR MANUAL (RM1100E)
05–938
DIAGNOSTICS
–
AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1
(a)
(b)
(c)
PERFORM ACTUATOR CHECK
Set the actuator in the check mode (see
page 05–871).
Press the blower switch to change to step operation.
Check the air flow level by hand.
Display Code
0
1
2
3
4
5
6
7
8
9
Blower level
0
1
16
16
16
16
16
16
16
31
OK:
Blower level changes in accordance with each dis-
play code.
NG
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE
PAGE 05–884)
Go to step 2
COROLLA VERSO REPAIR MANUAL (RM1100E)
05–939
DIAGNOSTICS
–
AIR CONDITIONING SYSTEM
2
CHECK HARNESS AND CONNECTOR(BLOWER MOTOR CONTROLLER – AIR
CONDITIONING AMPLIFIER) (SEE
PAGE 01–33)
(a)
(b)
Disconnect the connectors from the blower motor control-
ler and A/C amplifier.
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
Condition
Always
Always
Specified condition
Below 1
Ω
10 kΩ or higher
A12–20 (BLW) –
B15–2 (SI)
A12–20 (BLW) –
Body ground
Blower Motor Controller Connector
Front View:
B15
1
2
3
4
SI
A/C Amplifier Connector
Wire Harness View:
A12
I41091
I42554
BLW
I42490
NG
REPAIR OR
CONNECTOR
REPLACE
HARNESS
OR
OK
3
CHECK HARNESS AND CONNECTOR(BLOWER MOTOR CONTROLLER – BODY
GROUND) (SEE
PAGE 01–33)
(a)
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
Condition
Always
Specified condition
Below 1
Ω
B15–1 (GND) –
Body ground
Blower Motor Controller Connector
Front View:
B15
1
2
3
4
GND
I41515
NG
REPAIR OR
CONNECTOR
REPLACE
HARNESS
OR
OK
COROLLA VERSO REPAIR MANUAL (RM1100E)
05–940
DIAGNOSTICS
–
AIR CONDITIONING SYSTEM
4
INSPECT BLOWER MOTOR
(a)
(b)
2
B4
Blower Motor Connector
Wire Harness View:
1
Remove the blower motor.
Connect the positive (–) lead to terminal 2 of blower motor
connector, negative (+) lead to terminal 1.
OK:
Blower motor operates smoothly.
E50529
I42388
NG
REPLACE BLOWER MOTOR
OK
5
CHECK HARNESS AND CONNECTOR(AIR CONDITIONING AMPLIFIER – BLOWER
MOTOR CONTROL) (SEE
PAGE 01–33)
(a)
(b)
Disconnect the connectors from the blower motor and
blower motor controller.
Measure the resistance according to the value(s) in the
table below.
Tester connection
B15–3 (+B) – B4–1
B15–4 (VM) – B4–2
B15–3 (+B) –
Body ground
Condition
Always
Always
Always
Always
Specified condition
Below 1
Ω
Below 1
Ω
10 kΩ or higher
10 kΩ or higher
Blower Motor Connector
Front View:
B4
Blower Motor Controller Connector
Wire Harness View:
B15
B15–4 (VM) –
Body ground
+B
VM
I38797
NG
REPAIR OR
CONNECTOR
REPLACE
HARNESS
OR
OK
COROLLA VERSO REPAIR MANUAL (RM1100E)

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