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Honda Odyssey 2004. Manual - part 74

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Symptom

Diagnostic procedure

Also check for

10-20

Fan Controls

Symptom Troubleshooting Index

•
•

Radiator fan does not run at all,
but condenser fan runs with A/C
ON

Radiator and condenser fan circuit troubleshooting A (see
page 10-22).

Both radiator fan and condenser
fan do not run on low or high
speed with the A/C ON or when
the engine coolant temperature
is above 210°F (99°C)

Check the No. 3 (15A) fuse in the driver’s under-dash
fuse/relay box.

If the fuse is faulty, replace it.
If the fuse is OK, repair the open in the wire between the
No. 3 (15A) fuse in the driver’s under-dash fuse/relay
box and the radiator and condenser fan relays.

Condenser fan runs but radiator
fan does not run when the
engine coolant temperature is
above 199°F (93°C), but both
fans run with the A/C ON

Replace the radiator fan control relay.

Both the radiator fan and
condenser fan do not run at low
speed when the engine coolant
temperature is above 199°F
(93°C), but both fans run with
A/C ON and when the engine
coolant temperature is above
210°F (99°C)

Radiator and condenser fan circuit troubleshooting B (see
page 10-23).

Both radiator and condenser
fans do not run when the
engine coolant temperature is
above 199°F (93°C), but radiator
fan runs with A/C ON

Radiator and condenser fan low speed circuit
troubleshooting (see page 21-27).

Both radiator fan and condenser
fan run with ignition switch ON
(II), with A/C OFF, and when the
engine coolant temperature is
below 199°F (93°C)

Radiator and condenser fan circuit troubleshooting C (see
page 10-24).

Both radiator fan and condenser
fan do not run at high speed
with the A/C ON

Radiator and condenser fan high speed circuit
troubleshooting (see page 21-31).

Both radiator fan speed and
condenser fan speed do not
change from low to high when
the engine coolant temperature
is above 210°F (99°C), but both
fans speed change with A/C ON

Radiator and condenser fan high speed circuit
troubleshooting (see page 10-24).

Condenser fan speed does not
change from low to high with
A/C ON or the when engine
coolant temperature is above
210°F (99°C)

Condenser fan high speed circuit troubleshooting (see
page 21-31).

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０１

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−

10-21

Circuit Diagram

IG2 HOT in ON (II)

IGNITION SWITCH

BOX

FUSE/RELAY

UNDER DASH

PASSENGER’S

G201

BLK

BLU/RED

FAN MAIN
RELAY

RADIATOR

BLK/YEL

BLU/BLK

BLK

FAN SWITCH B

RADIATOR

G101

Closed : Above
210°F (99°C)

BLU/RED

GRN

BLU/RED

GRN

BLU/RED

BLK/YEL

FAN MOTOR

CONDENSER

BLU/RED

SYSTEM

AIR
CONDITIONING

DRIVER’S

GRN

BLU/YEL

RELAY

FAN

CONDENSER

UNDER HOOD FUSE/RELAY BOX

BATTERY

No.3
(7.5A)

BAT

IG2

199°F (93°C)

Closed : Above

UNDER DASH

G201

G101

No.41 (120A)

RADIATOR
FAN
RELAY

BLU/BLK

RADIATOR

WHT

YEL

FUSE/RELAY
BOX

RADIATOR
FAN SWITCH A

BLK

No.42 (50A)

No.57 (30A)

No.58 (30A)

FAN MOTOR

GRN

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０１

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YES

10-22

Fan Controls

Radiator and Condenser Fan Circuit Troubleshooting A

RADIATOR FAN RELAY 4P SOCKET

JUMPER
WIRE

RADIATOR FAN RELAY 4P SOCKET

NOTE: Refer to the symptom troubleshooting index
before troubleshooting.

1. Check the No. 57 (30A) fuse in the under-hood

fuse/relay box.

Go to step 2.

Check for a short in the wire between the

radiator fan relay, radiator fan motor and fan
control relay, condenser fan motor or a faulty fan
motor.

2. Remove the radiator fan relay from the under-hood

fuse/relay box and test it (see page 22-88).

Go to step 3.

Replace radiator fan relay.

3. Measure the voltage between radiator fan relay 4P

socket terminal No. 1 and body ground.

Go to step 4.

Replace the under-hood fuse/relay box.

4. Connect a jumper wire between radiator fan relay

4P socket terminals No. 1 and No. 2.

Go to step 5.

Go to step 7.

5. Disconnect the jumper wire, and turn the ignition

switch ON (II).

6. Measure the voltage between radiator fan relay 4P

socket terminal No. 4 and body ground.

Repair an open in the wire between the

radiator fan relay and the A/C pressure switch.

Replace the under-hood fuse/relay box.

Terminal side of female terminals

Is the f use OK ?

Is the r elay OK ?

Is ther e batter y voltage?

Does the r adiator f an r un?

Is ther e batter y voltage?

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０２

２１

２２

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YES

YES
NO

10-23

Radiator and Condenser Fan Circuit
Troubleshooting B

RADIATOR FAN MOTOR 2P CONNECTOR

BLU/BLK

GRN

RADIATOR FAN SWITCH A
2P CONNECTOR

BLK

7. Disconnect the radiator fan motor 2P connector.

8. Measure the voltage between fan motor 2P

connector terminal No. 2 and body ground.

Go to step 9.

Repair an open in the wire between radiator

fan relay 4P socket terminal No. 2 and radiator 2P
connector terminal No. 2.

9. Disconnect the jumper wire.

10. Test the radiator fan motor (see page 10-11).

Repair an open in the wire between radiator

fan motor 2P connector terminal No. 1 and body
ground G201.

Replace the radiator fan motor.

NOTE: Refer to the symptom troubleshooting index
before troubleshooting.

1. Disconnect the radiator fan switch A 2P connector.

2. Turn the ignition switch ON (II).

3. Measure the voltage between the radiator fan

switch A 2P connector terminal No. 2 and body
ground.

Go to step 4.

Repair an open in the wire between the

radiator fan switch A connector and under-hood
fuse/relay box.

4. Turn the ignition switch OFF, and check for

continuity between the radiator fan switch A 2P
connector terminal No. 1 and body ground.

Replace radiator fan switch A.

Check for an open in the wire between the

radiator fan switch A connector and body ground. If
the wire is OK, check for poor ground at G101.

Wire side of female terminals

Wire side of
female terminals

Is ther e batter y voltage?

Is the f an motor OK ?

Is ther e batter y voltage?

Is ther e continuity?

03/07/29 09:15:24 61S0X050_100_0023

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