Acura RL (1996-2004 year). Manual — part 63
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–
60-3
HVAC
13
)
(’04 Navi 7)
1
)
(’04 Navi 16)
(’96-’03 16)
17
)
Climate Control
See Ground
Distribution,
page 14-12.
CLIMATE
CONTROL
UNIT
BLK/YEL
HEATER
MOTOR
40A
M
G402
BLOWER
MOTOR
RELAY
CONDENSER FAN RELAY
COOLING FAN RELAY
7.5A
UNDER-
HOOD
FUSE/
RELAY
BOX
UNDER-
DASH
FUSE/
RELAY
BOX
C307
3
WHT
C403
2
(’96-’03 17)
18
)
2
5
4
BLOWER
MOTOR
BLOWER
MOTOR
HIGH
RELAY
3
4
1
Blower motor
control
feedback
Power
transistor
control
Blower motor
high relay
control
BLOWER
POWER
TRANSISTOR
1
2
G404
A
8
B
ORN
BLK
3
RED/BLK
BLU/RED
BLU/RED
LT GRN
BLK
LT GRN
BLU/RED
1
5
3
BLU/RED
BLK/YEL
See Ground
Distribution,
page 14-13.
BLK
BLK
BLK/YEL
BLK/YEL
See Power
Distribution,
page 10-6.
See Power
Distribution,
page 10-6.
BLK
BLK
BLK
BLK
C446
5
BLK/YEL
C324
1
C446
15
)
(’96-’03 14)
WHT
WHT
BLK/YEL
C446
BLK
1
BLK/YEL
3
BLK
C446
HOT IN ON
HOT AT ALL TIMES
2004 American Honda Motor Co., Inc.
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▼
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60-4
HVAC
How the Climate Control Circuit Works
The climate control unit controls the blower
controls, air delivery, and A/C compressor controls
either automatically or semi-automatically. The
control unit receives battery voltage at all times
through fuse 56. With the ignition switch in ON
(II), battery voltage is supplied through fuse 3.
The control unit is grounded at G402.
Fully-automatic Operation
To put the climate control in fully automatic mode,
press the AUTO button and set the fan control
dial to AUTO, then set the desired temperature
by turning the temperature control dial. You will
see FULL AUTO in the system’s display.
The system automatically selects the proper mix
of cooled and/or heated air that will, as quickly as
possible, raise or lower the interior temperature
from its current level to the set temperature. The
system also adjusts the fan speed and changes
direction of air delivery.
When you set the temperature to its lower limit
(60
F/18
C) or its upper limit (90
F/32
C), the
system runs at full cooling or full heating only. It
does not regulate the interior temperature. When
the temperature is set between the lower and
upper limits, the system regulates the interior
temperature to the set value.
Semi-automatic Operation
You can manually select various functions of the
climate control system when it is in FULL AUTO.
All other features remain automatically controlled.
Making a manual selection causes the word
FULL to go off.
However, when you select A/C OFF, the system
cannot regulate the inside temperature if you set
the dial lower than the temperature outside.
Blower Controls
The fan speed is automatically controlled in the
fully-automatic mode. You can manually select
the fan speed by turning the fan control dial
clockwise, just past the AUTO position. This
takes the fan from automatic mode to its lowest
manually controlled speed. Turning the dial
further clockwise increases the fan’s speed,
which increases air flow.
Battery voltage is applied through fuse 37 to the
blower motor relay contacts at all times. With the
ignition switch ON (ll), the blower motor relay in
the under-hood fuse/relay box is energized which
feeds battery voltage to the blower motor. The
blower power transistor controls the blower motor
in all speeds except HIGH. The blower power
transistor is controlled by the climate control unit.
When the control unit requests HIGH blower
speed, it grounds the blower motor HIGH relay
coil, energizing the relay, which connects the
blower motor directly to ground, making the
blower run at high speed.
In cold weather, the blower will not come on
automatically until the heater starts to produce
warm air.
Air Delivery
The climate control unit controls the blower motor
and supplies a 5 VDC reference voltage to the air
mixture control motor.
The air mix and mode control motors each
receive inputs from the control unit. The air mix
motor regulates the mixture of cold and hot air by
varying the position of the heater-evaporator
door. The mode control motor controls the
direction and volume of outlet air. Use the MODE
button to select the vents the air flows from.
Some air will flow from the side vents and the
dashboard corner vents in all modes. Each time
you press the MODE button, the display shows
the mode selected. Press the button four times to
see all the modes. Both the air mix control motor
and mode control motor are grounded by the
control unit.
The recirculation control motor receives battery
voltage through fuse 3 when the ignition switch is
ON (II). It regulates the position of the fresh/recirc
door, and is controlled by two position inputs from
the control unit (“Recirc” and “Fresh”).
A/C Compressor Controls
Voltage is provided at all times to the A/C
compressor clutch relay contacts through fuse 5.
With the ignition switch ON (II), voltage is supplied
to the relay coil through fuse 3.
With the ignition switch ON (II), the climate
control unit grounds the A/C ON input of the PCM
through the A/C pressure switch and the fan
control unit. The PCM then grounds
2004 American Honda Motor Co., Inc.
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▲
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60-5
HVAC
How the Climate Control Circuit Works
the A/C compressor clutch relay coil. This
energizes the coil, which closes the relay
contacts and provides voltage through fuse 5 to
the A/C compressor clutch. The clutch then
engages and begins turning the compressor. By
default, when the climate control system is on,
the A/C is also on.
Evaporator Temperature Sensor
The evaporator temperature sensor is located on
the evaporator housing. If the temperature at the
evaporator gets too cold, the evaporator
temperature sensor sends a signal to the climate
control unit to turn off the A/C compressor clutch.
This prevents condensation from freezing on the
evaporator fins and blocking air delivery into the
passenger compartment.
A/C Pressure Switch
The A/C pressure switch is located in the
condenser outlet line where refrigerant is in a
high temperature/high pressure liquid state. The
switch will sense abnormally high or low
pressure, and open the circuit. This removes
ground from the PCM, and turns off the
compressor.
Refer to the Service Manual (Section 22,
Automatic Climate Control) for specific tests or
troubleshooting procedures.
2004 American Honda Motor Co., Inc.
▼
▼
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63
Fans
BLK/YEL
C331
4
CONDENSER
FAN RELAY
BLU
RADIATOR
FAN MAIN
RELAY
1
4
2
BLK
LT GRN/BLK
5
M
RADIATOR
FAN
MOTOR
1
C333
See Ground
Distribution,
page 14-7.
BLK
2
C333
M
CONDENSER
FAN
MOTOR
1
C334
2
C334
3
RED
BLU/ORN
3
4
1
2
UNDER-HOOD
RELAY BOX A
BLU
BLK
BLU
G302
CONDENSER
FAN
20A
C307
11
UNDER-
HOOD
FUSE/
RELAY
BOX
RADIATOR
FAN
RELAY
1
3
)
(
*
5 )
2
(
*
3)
5
)
UNDER-
HOOD
RELAY
BOX C
COOLING
FAN
20A
YEL
C306
4
1
C327
CONDENSER FAN RELAY
COOLING FAN RELAY
7.5A
3
5
G301
UNDER-
HOOD
RELAY
BOX A
BLU
BLU/ORN
WHT
LT
GRN/
BLK
BLK/YEL
BLK/YEL
BLK
BLK/YEL
LT GRN/BLK
LT GRN/BLK
BLU
See Ground
Distribution,
page 14-7.
LT GRN/BLK
*
= ’96-’97
HOT IN ON
HOT AT ALL TIMES
2004 American Honda Motor Co., Inc.
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▲
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