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Honda Odyssey 2004. Manual - part 390

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YES

21-36

Heating/Air Conditioning

A/C Pressure Switch Circuit Troubleshooting (cont’d)

HEATER CONTROL PANEL 22P CONNECTOR

YEL/GRN

BRN

HEATER CONTROL PANEL 22P CONNECTOR

HEATER FAN SWITCH 7P CONNECTOR

GRN

HEATER FAN SWITCH 7P CONNECTOR

BLK

11. Measure the resistance between the No. 17 and No.20

terminals of the heater control panel 22P connector.

Go to step 12.

Repair cause of high resistance in the

evaporator temperature circuit.

12. Disconnect the heater fan switch 7P connector.

13. Check for continuity between the No. 21 terminal of

the heater control panel 22P connector and the
No. 2 terminal of the heater fan switch 7P
connector.

Go to step 14.

Repair open in the wire between the heater

control panel and the heater fan switch.

14. Test the heater fan switch (see page 21-40).

Go to step 15.

Replace the heater fan switch.

15. Check for continuity between the No. 1 terminal of

the heater fan switch 7P connector and body
ground.

Check for loose wire or poor connections at

the heater control panel 22P connector, the heater
fan switch 7P connector and at the A/C pressure
switch 4P connector. If the connections are good,
substitute a known-good heater control panel, and
recheck. If the symptom/indication goes away,
replace the original heater control panel.

Check for an open in the wire between the

heater fan switch and body ground. If the wire is
OK, check for poor ground at G401.

16. Check for proper A/C system pressure.

Replace the A/C pressure switch.

Repair the A/C pressure problem.

Wire side of female terminals

Is the r esistance less than 24 k ohms?

Is ther e continuity?

Is the heater f an switch OK ?

Is ther e continuity?

Is the pr essur e within specif ications?

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Max Cool

about 0.7 V

Max Hot

about 4.2 V

21-37

Air Mix Control Motor Test

Air Mix Control Motor Replacement

AIR MIX CONTROL MOTOR

1. Disconnect the 7P connector from the air mix

control motor.

Incorrectly applying power and ground to
the air mix control motor will damage it.
Follow the instructions carefully.

2. Connect battery power to the No. 1 terminal of the

air mix control motor, and ground the No. 2
terminal; the air mix control motor should run, and
stop at Max Cool. If it doesn’t, reverse the
connections; the air mix control motor should run,
and stop at Max Hot.

3. If the air mix control motor did not run in step 2,

remove it, then check the air mix control linkage
and doors for smooth movement.

• If the linkage and door move smoothly, replace

the air mix control motor.

• If the linkage or door sticks or binds, repair them

as needed.

• If the air mix control motor runs smoothly, go to

step 4.

4. Measure the resistance between the No. 5 and

No. 7 terminals. It should be between 4.2 to 7.8 k

5. Reconnect the air mix control motor 7P connector,

then turn the ignition switch ON(II).

6. Using the backprobe set, measure the voltage

between the No. 3 and No. 5 terminals.

7. If either the resistance or voltage readings are not

as specified, replace the air mix control motor.

1. Disconnect the 7P connector (A) from the air mix

control motor (B). Remove the rod (C) of the air mix
control motor from the air mix control linkage (D).
Remove the self-tapping screws and the air mix
control motor from the heater unit.

2. Install the motor in the reverse order of removal.

Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.

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21-38

Heating/Air Conditioning

Mode Control Motor Test

Mode Control Motor Replacement

MODE CONTROL MOTOR

1. Disconnect the 7P connector from the mode control

motor.

Incorrectly applying power and ground to
the mode control motor will damage it.
Follow the instructions carefully.

2. Connect battery power to the No. 1 terminal of the

mode control motor, and ground the No. 2
terminal; the mode control motor should run
smoothly, and stop at Defrost. If it doesn’t, reverse
the connections; the mode control motor should
run smoothly, and stop at Vent. When the mode
control motor stops running, disconnect battery
power immediately.

3. If the mode control motor did not run in step 2,

remove it, then check the mode control linkage and
doors for smooth movement.

• If the linkage and doors move smoothly, replace

the mode control motor.

• If the linkage or doors stick or bind, repair them

as needed.

• If the mode control motor runs smoothly, go to

step 4.

4. Use a digital multimeter with an output of 1 mA or

less at the 20 k

range. With the mode control

motor running as in step 2, check for continuity
between the No. 3, 4, 5, and 6 terminals and the
No. 7 terminal individually. There should be
continuity for a moment at each terminal as the
motor moves past the switch’s terminal.

5. If there is no continuity for a moment at each

terminal, replace the mode control motor.

1. Disconnect the 7P connector (A) from the mode

control motor (B). Remove the rods (C) of the mode
control motor from the mode control motor linkage
(D) and the mode control linkage (E). Remove the
self-tapping screws and the mode control motor
from the heater unit.

2. Install the motor in the reverse order of removal.

After installation, make sure the motor runs
smoothly.

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21-39

Recirculation Control Motor Test

Recirculation Control Motor
Replacement

RECIRCULATION CONTROL MOTOR

1. Disconnect the 7P connector from the recirculation

control motor.

Incorrectly applying power and ground to
the recirculation control motor will damage it.
Follow the instructions carefully.

2. Connect battery power to the No. 1 terminal of the

recirculation control motor, and ground the No. 5
or No. 7 terminals; the recirculation control motor
should run smoothly. To avoid damaging the
recirculation control motor, do not reverse power
and ground. Disconnect the No. 5 or No. 7
terminals from ground; the recirculation control
motor should stop at Fresh (when the No. 7
terminal is disconnected) or Recirculate (when the
No. 5 terminal is disconnected). Don’t cycle the
recirculation control motor for a long time.

3. If the recirculation control motor did not run in step

2, remove it, then check the recirculation control
linkage and doors for smooth movement.

• If the linkage and doors move smoothly, replace

the recirculation control motor.

• If the linkage or doors stick or bind, repair them

as needed.

1. Remove the glove box stops, and let the glove box

hang down (see page 20-71).

2. Remove the wire harness connectors from the

evaporator.

3. Disconnect the 7P connector (A) from the

recirculation control motor (B). Remove the self-
tapping screws and the recirculation control motor
from the blower unit.

4. Install the motor in the reverse order of removal.

Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.

03/07/29 10:10:34 61S0X050_210_0040

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