Acura CSX. Manual — part 488
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21-69
21-69
Sunlight Sensor Test
Sunlight Sensor Replacement
RED
PUR
A
A
B
1. Remove the sunlight sensor (A) from the
dashboard (see page 21-69).
2. Turn the ignition switch to ON (II). Measure the
voltage between the terminals with the (
) probe
on terminal No. 2 and the (
) probe on terminal
No. 1 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 21-69).
1. Remove the gauge control module (SPEEDO)
(see page 22-277).
2. Remove the sunlight sensor (A) from the
dashboard with a flat-tip screwdriver, then
disconnect the connector (B). Be careful not to
damage the sensor and the dashboard.
3. Install the sensor in the reverse order of removal.
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21-70
Climate Control
Evaporator Temperature Sensor Test
EVAPORATOR TEMPERATURE SENSOR
40
30
20
10
RESISTANCE
(k
)
10
50
20
68
30 °C
86 °F
TEMPERATURE
0
32
1. Remove the evaporator core and the evaporator
temperature sensor (see page 21-78).
2. Dip the sensor in ice water, and measure the
resistance between its terminals.
3. Then pour warm water on the sensor, and check for
a change in resistance.
4. Compare the resistance readings with the
specifications shown in the graph; the resistance
should be within the specifications.
5. If the resistance is not as specified, replace the
evaporator temperature sensor (see page 21-78).
Terminal side of male terminals
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21-71
Power Transistor Test
POWER TRANSISTOR
(To 12 V Power source on vehicle)
JUMPER WIRE
A
1. Remove the passenger’s dashboard undercover
(see page 20-104).
2. Disconnect the 4P connector from the power
transistor.
3. Measure the resistance between terminals No. 3
and No. 4 of the power transistor. It should be
about 1.5 k
.
• If the resistance is within the specifications, go to
step 4.
• If the resistance is not within the specifications,
replace the power transistor.
NOTE: Also check the blower motor. Power
transistor failure can be caused by a defective
blower motor.
4. Carefully release the lock tab on terminal No. 1
(YEL) (A) in the 4P connector, then remove the
terminal and insulate it from body ground.
5. Reconnect the 4P connector to the power transistor.
6. Make sure the YEL wire is completely isolated, then
supply 12 V to cavity No. 1 with a jumper wire.
7. Turn the ignition switch to ON (II), and check that
the blower motor runs.
• If the blower motor does not run, replace the
power transistor.
NOTE: A faulty blower motor can cause the
power transistor to fail. If the power transistor is
replaced, also check the blower motor for
binding, and replace it if necessary.
• If the blower motor runs, the power transistor is
OK.
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Max Cool: About 0.5 V
Max Hot: About 4.5 V
21-72
21-72
Climate Control
Air Mix Control Motor Test
Air Mix Control Motor Replacement
AIR MIX CONTROL MOTOR
B
A
NOTE: Before testing, check for HVAC DTCs (see page
21-9).
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 terminal No. 1 of the air
mix control motor, and ground terminal No. 2; the
air mix control motor should run, and stop at Max
Hot. If it doesn’t, reverse the connections; the air
mix control motor should run, and stop at Max Cool.
When the air mix control motor stops running,
disconnect battery power immediately.
3. If the air mix control motor did not run in step 2,
remove it, then check the air mix control linkage
and door for smooth movement.
• If the linkage and door move smoothly, replace
the air mix control motor (see page 21-72).
• 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 terminals No. 5
and No. 7. It should be between 4.2 to 7.8 k
.
5. Reconnect the air mix control motor 7P connector,
then turn the ignition switch to ON (II).
6. Using the backprobe set, measure the voltage
between terminals No. 3 and No. 7.
7. If either the resistance or voltage readings are not
as specified, replace the air mix control motor
(see page 21-72).
1. Remove the driver’s dashboard undercover
(see page 20-103).
2. Disconnect the 7P connector (A) from the air mix
control motor (B). Remove the self-tapping screws
and the air mix control motor from the heater unit.
3. 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.
08/08/21 14:43:37 61SNR030_210_0073
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