Table of Contents
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Symptom Troubleshooting Index
Symptom
Rear blower motor does not run at
all.
Rear blower motor does not run at
low speed position.
Rear blower motor does not run at
middle speed position.
Rear blower motor does not run
on low, middle, and high for
heating, but runs on high for
cooling.
Rear blower motor does not run at
high speed position for heating.
Rear mode control doors do not
change between ceiling vents
(cool) and floor vents (hot).
Diagnostic procedure
Rear blower motor circuit
troubleshooting (see page 21-125)
Rear blower motor low speed circuit
troubleshooting (see page 21-127)
Rear blower motor middle speed
circuit troubleshooting (see page 21-
129)
Rear blower motor high speed
circuit troubleshooting hot and/or
cold (see page 21-131)
Rear blower motor high speed
circuit troubleshooting hot and/or
cold (see page 21-131)
Rear mode control motor circuit
troubleshooting (see page 21-134)
Also check for
•
Blown fuse No. 60 (40A) in the multi-
fuse/relay box ('99-02 models), or
the No. 80 (40A) fuse in the under-
hood sub huse box (03'-04 models)
located under-hood next to battery,
and No. 3 (7.5A) in the driver's
under-dash fuse/relay box
•
Poor ground at G401 and G582
•
Cleanliness and tightness of all
connectors
•
Faulty rear blower motor low relay
•
Faulty rear blower resistor
•
Open in the wire
•
Poor ground at G582
•
Cleanliness and tightness of all
connectors
•
Faulty rear blower motor middle
relay
•
Faulty rear blower resistor
•
Open in the wire
•
Poor ground at G582
•
Cleanliness and tightness of all
connectors
•
Faulty rear blower motor main relay
Open in the wire
•
•
Poor ground at G582
•
Cleanliness and tightness of all
connectors
•
Faulty rear blower motor main relay
•
Faulty rear blower motor high relay
•
Faulty rear blower resistor
•
Open in the wire
•
Poor ground at G582
•
Cleanliness and tightness of all
connectors
•
Blown fuse No. 3 (7.5A) in the
driver's under-dash fuse/relay box
•
Faulty rear heater-A/C passenger's
mode control motor relay
•
Faulty rear heater-A/C passenger's
control panel
•
Open in the wire
•
Poor ground at G582
•
Cleanliness and tightness of all
connectors
21-123
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