
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting
55-46
Inspection procedure 8
Blower does not operate in HI mode.
Probable cause
If the blower does not operate in HI mode when the temperature is set to 17 or
32, the cause is probably a malfunction of the blower motor HI relay circuit system.
D
Malfunction of blower motor HI relay
D
Malfunction of blower motor
D
Malfunction of connector or harness
D
Malfunction of A/C-ECU
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor HI relay and the
A/C-ECU, and repair if necessary.
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor HI relay and the
blower motor, and repair if necessary.
OK
Measure at the blower motor HI relay connector B-34.
D
Disconnect the connector, and measure at the harness
side connector.
(1) Connect terminal (1) to earth.
OK: Blower operates.
(2) Continuity between terminal (3) and body earth
OK: Continuity
(3) Voltage between terminal (4) and body earth (Ignition
switch: ON)
OK: System voltage
(1) NG
Check the following connector:
B-34
D
Blower motor HI relay check (Refer to P.55-57.)
D
Blower motor check (Refer to P.55-21.)
NG
Repair
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor HI relay and the
body earth, and repair if necessary.
(2) NG
Check the following connector:
B-34
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor HI relay and the
junction block, and repair if necessary.
(3) NG
Check the following connector:
B-34
NG
Repair
OK
Check the trouble symptom.
YES
Check the following connector:
B-04
OK
Separate A/C-ECU connector B-04 and connect the terminal (12)
of the harness side connector to the earth. Does the blower
operate?
NO
Check the following connector:
B-34
NG
Replace the A/C-ECU.