Honda 2004 Odyssey Service Manual page 1541

Heating/Air Conditioning
Symptom Troubleshooting Index
Symptom
Recirculation control doors do not
change between Fresh and
Recirculate.
Blower motor runs, but one or
more speeds do not work.
Blower motor does not run at all.
Blower, heater controls, and A/C
do not work.
Both fans do not run at low speed
with the A/C on when the
refrigerant pressure is below
1,520 kPa (15.5 kgf/cm , 220 psi).
Condenser fan does not run at
high speed when the engine
coolant temperature is above
210°F (99°C) or the refrigerant
pressure is above 1,520 kPa
2
(15.5 kgf/cm , 220 psi) with the A/C
on.
Both fans do not run at high speed
with the A/C on when the
refrigerant pressure is above
1,520 kPa (15.5 kgf/cm , 220 psi).
Compressor clutch does not
engage. (but both fans run with
the A/C on)
A/C system does not come on
(both fans and compressor do not
work); heater is OK.
21-10
Diagnostic procedure
Recirculation control motor
circuit troubleshooting (see
page 21-21)
Blower motor circuit
troubleshooting (see page
21-22)
Blower motor circuit
troubleshooting (see page
21-22)
Heater control power and
ground circuit
troubleshooting (see page
21-26)
Radiator and condenser fan
low speed circuit
troubleshooting (see page
2
21-27)
Condenser fan high speed
circuit troubleshooting (see
page 21-30)
Radiator and condenser fan
high speed circuit
troubleshooting (see page
2
21-31)
Compressor clutch circuit
troubleshooting (see page
21-32)
A/C pressure switch circuit
troubleshooting (see page
21-35)
Also check for
• HVAC DTCs (see page 21-8)
• Blown fuse No. 3 (7.5A) in the driver's under-
dash fuse/relay box
• Cleanliness and tightness of all connectors
• HVAC DTCs (see page 21-8)
• Blown fuse No. 56 (40A) in the under-hood
fuse/relay box, and No. 3 (7.5A) in the driver's
under-dash fuse/relay box
• Poor ground at G201 and G401
• Cleanliness and tightness of all connectors
• HVAC DTCs (see page 21-8)
• Blown fuse No. 56 (40A) in the under-hood
fuse/relay box, and No. 3 (7.5A) in the driver's
under-dash fuse/relay box
• Poor ground at G201 and G401
• Cleanliness and tightness of all connectors
• HVAC DTCs (see page 21-8)
• Blown fuse No. 54 (40A) in the under-hood
fuse/relay box, No. 3 (7.5A) in the driver's
under-dash fuse/relay box, and No. 13 (7.5A)
in the passenger's under-dash fuse/relay box
• Poor ground at G401
• Cleanliness and tightness of all connectors
• HVAC DTCs (see page 21-8)
• Blown fuse No. 58 (30A) in the under-hood
fuse/relay box, and No. 3 (7.5A) in the driver's
under-dash fuse/relay box
• Poor ground at G201
• Cleanliness and tightness of all connectors
• HVAC DTCs (see page 21-8)
• Blown fuse No. 3 (7.5A) in the driver's under-
dash fuse/relay box
• Poor ground at G201
• Cleanliness and tightness of all connectors
• HVAC DTCs (see page 21-8)
• Cleanliness and tightness of all connectors
• HVAC DTCs (see page 21-8)
• Blown fuse No. 59 (7.5A) in the under-hood
fuse/relay box, and No. 3 (7.5A) in the driver's
under-dash fuse/relay box
• Cleanliness and tightness of all connectors
• HVAC DTCs (see page 21-8)
• Cleanliness and tightness of all connectors