ACURA CSX 2006 Service Repair Manual



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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
21-7221-72 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.
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21-7321-73
Mode Control Motor Test Mode Control Motor Replacement
MODE CONTROL MOTOR
A
B
A B
NOTE: Before testing, check for HVAC DTCs (see page
21-9).
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 terminal No. 1 of the mode control motor, and ground terminal No. 2;
the mode control motor should run smoothly, and
stop at Vent. If it doesn’t, reverse the c onnections;
the mode control motor should run smoothly, and
stop at Defrost. 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 (see page 21-73).
 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 terminals No. 3, 4, 5, and 6 and terminal
No. 7 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 (see page
21-73). 1. Remove the glove box (see page 20-104).
2. Remove the wire harness clip (A), the self-tapping
screws, and the passenger’s heater duct (B).
3. Disconnect the 7P connector (A) from the mode control motor (B). Remove the self-tapping screws
and the mode 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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Recirculate: About 4.0 V
Fresh: About 1.0 V
21-7421-74 Climate Control
Recirculation Control Motor Test Recirculation Control Motor
Replacement
RECIRCULATION CONTROL MOTOR
A
B
NOTE: Before testing, check for HVAC DTCs (see page
21-9). 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 terminal No. 1 of the recirculation control motor, and ground terminal
No. 2; the recirculation control motor should run,
and stop at Recirculate. If it doesn’t, reverse the
connections; the recirculation control motor should
run, and stop at Fresh. When the recirculation
control motor stops running, disconnect battery
power immediately.
3. If the recirculation control motor did not run in step 2, remove it, then check the recirculation control
linkage and door for smooth movement.
 If the linkage and door move smoothly, replace the recirculation control motor (see page 21-74).
 If the linkage or door sticks or binds, repair them as needed.
 If the recirculation 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 recirculation 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 recirculation control motor
(see page 21-74). 1. Remove the glove box (see page 20-104) and the
kick panel (see page 20-66).
2. 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.
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.
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21-7521-75
Climate Control Unit Removal/
Installation Dust and Pollen Filter Replacement
B
A A
A
B
1. Remove the center panel:  ’06-08 models with navigation (see page 23-155)
 ’06-08 models without navigation (see page23-80)
 ’09 model with navigation (see page 23-355)
 ’09 model without navigation (see page 23- 256)
2. Remove the dials (A), the self-tapping screws, and the climate control unit (B).
3. Install the control unit in the reverse order of removal. After installation, operate the various
functions to see whether works properly.
4. Run the self-diagnostic function to confirm that there are no problems in the system (see page
21-11). 1. Open the glove box. Remove the glove box stop on
each side, then let the glove box hang down
(see page 20-104).
2. Remove the dust and pollen filter assembly (A) from the evaporator.
3. Remove the filter (A) from the housing (B), and replace the filter.
4. Install the filter in the reverse order of removal. Make sure that there is no air leaking out of the
evaporator.
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21-76 Climate Control
Blower Unit Removal/Installation
A
A A
B
B A
1. Remove the glove box (see page 20-104).
2. Cut the plastic cross brace (A) in the glove box
opening with diagonal cutters in the area shown,
and discard it.
3. Remove the bolts and the glove box frame (A). 4. Remove the wire harness clip (A), the self-tapping
screws, and the passenger’s heater duct (B).
5. Disconnect the connector (A) from the blower motor. Remove the wire harness clip (B).
Cut here.
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21-7721-77
Blower Unit Component
Replacement
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
B
A C
BA
6. Disconnect the connector (A) from the recirculation
control motor. Remove the self-tapping screws, the
bolt, the mounting nuts, and the blower unit (B).
7. Install the unit in the reverse order of removal. Make sure that there is no air leakage. Note these items when overhauling the blower unit:
 The recirculation control motor (A), blower motor (B), and the dust and pollen filter (C) can be replaced
without removing the blower unit.
 Before reassembly, make sure that the recirculation control linkage and door move smoothly without
binding.
 After reassembly, make sure the recirculation control motor runs smoothly (see page 21-74).
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21-7721-77
Blower Unit Component
Replacement
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
B
A C
BA
6. Disconnect the connector (A) from the recirculation
control motor. Remove the self-tapping screws, the
bolt, the mounting nuts, and the blower unit (B).
7. Install the unit in the reverse order of removal. Make sure that there is no air leakage. Note these items when overhauling the blower unit:
 The recirculation control motor (A), blower motor (B), and the dust and pollen filter (C) can be replaced
without removing the blower unit.
 Before reassembly, make sure that the recirculation control linkage and door move smoothly without
binding.
 After reassembly, make sure the recirculation control motor runs smoothly (see page 21-74).
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21-78 Climate Control
Evaporator Core Replacement
A
6x1.0mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
6x1.0mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
A B
C
D
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft) A
1. Recover the refrigerant with a recovery/recycling/
charging station (see page 21-90).
2. Disconnect the clamp (A), then remove the bolt.
3. Remove the nut, then disconnect the A/C lines (A) from the evaporator core. 4. Remove the stud bolt.
5. Remove the blower unit (see page 21-76).
6. Disconnect the connectors (A) from the evaporator
temperature sensor and the power transistor, then
remove the connector clip (B). Remove the
self-tapping screws, the expansion valve cover (C),
and the seal (D).
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21-79
BA
94 mm
(3.70 in.) 229.5 mm
(9.04 in.)
A
B
7. Carefully pull out the evaporator core (A) withoutbending the lines, then remove the plate (B).
8. Remove the clips (A) and the evaporator temperature sensor (B). 9. Install the core in the reverse order of removal, and
note these items:
 If you’re installing a new evaporator core, add refrigerant oil (SP-10) (see page 21-7).
 Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
 Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture
absorption.
 Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil
contacts the paint, wash it off immediately.
 Make sure that there is no air leakage.
 Charge the system (see page 21-92).
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