
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting
55-45
Inspection procedure 7
Blower does not operate.
Probable cause
If no air comes out of the blower even though the blower switch is on, the
cause is probably a malfunction of the blower motor relay circuit.
D
Malfunction of blower motor relay
D
Malfunction of blower motor
D
Malfunction of connector or harness
D
Malfunction of A/C-ECU
Can an operating sound be heard when the blower speed change-
over switch is operated?
NO
Inspection procedure 15 (Refer to P.55-52.)
YES
D
Blower motor relay check (Refer to P.55-13.)
D
Blower motor check (Refer to P.55-21.)
NG
Repair
OK
Measure at the blower motor relay connector B-72.
D
Disconnect the connector, and measure at the harness
side connector.
(1) Continuity between terminal (1) and body earth
OK: Continuity
(2) Voltage between terminal (3) and body earth (Ignition
switch: ON)
OK: System voltage
(3) Voltage between terminal (5) and body earth
OK: System voltage
(1) NG
Check the harness between the blower motor relay and the body
earth, and repair if necessary.
(2) NG
Check the harness between the blower motor relay and the ignition
switch, and repair if necessary.
(3) NG
Check the harness between the blower motor relay and the fusible
link No.1, and repair if necessary.
OK
Measure at the blower motor connector B-33.
D
Disconnect the connector, and measure at the harness
side connector.
D
Voltage between terminal (1) and body earth (Ignition
switch: ON)
OK: System voltage
NG
Check the following connector:
B-76
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor relay and the blower
motor, and repair if necessary.
OK
Check the following connector:
B-33
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor and earth, and
repair if necessary.