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Honda Ridgeline. Manual - part 424

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YES

21-132

Climate Control

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

UNDER-HOOD RELAY BOX CONNECTOR H (18P)

A/C PRESSURE SWITCH 4P CONNECTOR

BLU/RED

A/C PRESSURE SWITCH 4P CONNECTOR

BLU/RED

JUMPER WIRE

18. Check for proper A/C system pressure.

Replace the A/C pressure switch.

Repair the A/C pressure problem.

19. Disconnect under-hood relay box connector H (18P).

20. Check for continuity between the A/C pressure

switch connector No. 4 terminal and under-hood
relay box connector H (18P) No. 3 terminal.

Go to step 21.

Repair open in the wire between the relay

control module and the A/C pressure switch.

21. Reconnect under-hood relay box connector H (18P).

22. Connect the A/C pressure switch connector No. 4

terminal to body ground with a jumper wire.

23. Start the engine.

Replace the relay control module.

Check for loose wires or poor connections. If

the connections are good, check the grounds. If the
grounds are good, replace the relay control
module.

Wire side of female terminals

Is the pr essur e within specif ications?

Is ther e continuity?

Do the A/ C compr essor and f ans come on?

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21-133

In-car Temperature Sensor Test

In-car Temperature Sensor
Replacement

IN-CAR TEMPERATURE SENSOR

50
10

68
20

86
30

104 °F
40 °C

TEMPERATURE

RESISTANCE
(k

)

12
11
10

9
8
7
6
5
4
3
2
1

1. Remove the in-car temperature sensor (see page

21-133).

2. Test the in-car temperature sensor while holding it

in front of the dashboard center vent.

• Measure the resistance with the system set to

Max Cool.

• Measure the resistance with the system set to

Max Hot.

3. Compare the resistance reading between the No. 1

and No. 2 terminals of the in-car temperature
sensor with the specifications shown in the graph;
the resistance should be within the specifications.

4. If the resistance is not as specified, replace the in-

car temperature sensor (see page 21-133).

1. Remove the driver’s dashboard lower cover

(see page 20-83).

2. Remove the self-tapping screws and the in-car

temperature sensor (A) from the driver’s
dashboard lower cover (B).

3. Install the sensor in the reverse order of removal.

Be sure to connect the air hose securely.

Terminal side of male terminals

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21-134

Climate Control

Sunlight Sensor Test

Sunlight Sensor Replacement

ORN

RED/BLK

1. Remove the sunlight sensor (A) from the

dashboard.

2. Turn the ignition switch ON (II). Measure the

voltage between the terminals with the (

) probe

on the No. 1 terminal and the (

) probe on the

No. 2 terminal with the connector connected.

NOTE: The voltage readings will not change under
the light of a flashlight or a fluorescent lamp.

Voltage should be:

• 3.6

3.7 V or more with the sensor out of direct

sunlight.

• 3.3

3.5 V or less with the sensor in direct

sunlight.

3. If the voltage is not as specified, replace the

sunlight sensor (see page 21-134).

1. Remove the sunlight sensor (A) from the

dashboard, then disconnect the connector (B). Be
careful not to damage the sensor and the
dashboard.

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

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Max Cool:

About 0.5 V

Max Hot:

About 4.5 V

21-135

Driver’s Air Mix Control Motor Test

Driver’s Air Mix Control Motor
Replacement

DRIVER’S AIR MIX CONTROL MOTOR

NOTE: Before testing, check for HVAC DTCs (see page
21-8).

1. Disconnect the 7P connector from the driver’s air

mix control motor.

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

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

driver’s air mix control motor, and ground the No. 2
terminal; the driver’s air mix control motor should
run, and stop at Max Cool. If it doesn’t, reverse the
connections; the driver’s air mix control motor
should run, and stop at Max Hot. When the driver’s
air mix control motor stops running, disconnect
battery power immediately.

3. If the driver’s air mix control motor did not run in

step 2, remove it, then check the driver’s air mix
control linkage and door for smooth movement.

• If the linkage and door move smoothly, replace

the driver’s air mix control motor (see page
21-135).

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

as needed.

• If the driver’s 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 driver’s 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. 7 terminals.

7. If either the resistance or voltage readings are not

as specified, replace the driver’s air mix control
motor (see page 21-135).

1. Remove the driver’s dashboard lower cover

(see page 20-83).

2. Remove the self-tapping screws and the duct (A).

3. Disconnect the 7P connector (A) from the driver’s

air mix control motor (B). Remove the self-tapping
screws and the driver’s air mix control motor from
the heater 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.

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