NOTE: If the power transistor is faulty, check the blower motor for damage. If necessary, replace the blower motor.
12.
Blower motor relay check:
Blower motor relay check
?1.
Turn the vehicle to the OFF (LOCK) mode.
?2.
Remove the blower motor relay from the under-dash relay holder A, and test it.
Is the relay OK?
YES
Go to step 13.
NO
Replace the blower motor relay.?
13.
Open wire check (+B HTR MTR line):
Open wire check (+B HTR MTR line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Blower motor relay: disconnected
Test point 1
Blower motor relay 4P socket No. 1
Test point 2
Body ground
Is there battery voltage?
YES
The +B HTR MTR line is OK. Go to step 14.
NO
Repair an open in the wire between the No. D3 (30 A) fuse in the auxiliary under-dash fuse box and the blower motor relay.?
14.
Open wire check (IG2 A/C line):
Open wire check (IG2 A/C line)
?1.
Turn the vehicle to the ON mode.
?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Blower motor relay: disconnected
Test point 1
Blower motor relay 4P socket No. 7
Test point 2
Body ground
Is there battery voltage?
YES
The IG2 A/C wire is OK. Go to step 15.
NO
Repair an open in the wire between the No. C24 (7.5 A) fuse in the under-dash fuse/relay box and the blower motor relay. If wire is OK, replace the under-dash fuse/relay box.?
15.
Open wire check (GND line):
Open wire check (GND line)
?1.
Turn the vehicle to the OFF (LOCK) mode.
?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Blower motor relay: disconnected
Test point 1
Blower motor relay 4P socket No. 8
Test point 2
Body ground
Is there continuity?
YES
Repair an open in the wire between the blower motor relay and the blower motor.?
NO
Check for an open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G403.?