relay ACURA CSX 2006 Service Repair Manual


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21-19
System Description
EXPANSION VALVE
(Meters the required amount of
refrigerant into the evaporator) RECEIVER/DRYER
DESICCANT
(Traps debris, and
removes moisture)A/C COMPRESSOR
(Suction and compression)
A/C CONDENSER
(Radiation of heat)
A/C PRESSURE SENSOR
(Triple function)
BLOWER FAN
EVAPORATOR
(Absorption of heat)
EVAPORATOR TEMPERATURE SENSOR
RELIEF VALVE
(Relieves pressure at the A/C compressor
when the pressure is too high)
HIGH PRESSURE VAPORHIGH PRESSURE LIQUID
LOW PRESSURE LIQUID
LOW PRESSURE VAPOR
The air conditioning (A/C) system removes heat from the passenger compartment by transferring heat from the
ambient air to the evaporator. The A/C system refrigerant expands in the evaporator, and the evaporator becomes
very cold and absorbs the heat from the ambient air. The blower fan pushes air across the evaporator where the heat
is absorbed, and then it blows the cool air into the passenger compartment.
This vehicle uses HFC-134a (R-134a) refrigerant, which does not contain chlorofluorocar bons. Pay attention to the
following service items:
 Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
 Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (SP-10) designed for the R-134a A/C compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in A/C
compressor failure.
 All A/C system parts (A/C compressor, discharge line, suction line, evaporator, A/C condenser, receiver/dryer, expansion valve, O-rings for joints) are designed for refrigerant R-134a. Do not exchange with R-12 parts.
 Use a halogen gas leak detector designed for refrigerant R-134a.
 R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service the R-134a air
conditioning systems.
 Always recover refrigerant R-134a with an approved recovery/recycling/charging station before disc onnecting any
A/C fitting.
(cont’d)
When the refrigerant is below
196 kPa (2.0 kgf/cm , 28 psi)
or above 3,138 kPa (32 kgf/cm ,
455 psi), the ECM/PCM turns the
compressor relay off to protect
the A/C compressor.
When the refrigerant is above
1,470 kPa (15.0 kgf/cm , 213 psi),
the A/C pressure sensor
switches the radiator and
A/C condenser fans to high speed.22
2
08/08/21 14:40:59 61SNR030_210_0020
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Climate Control Unit Inputs and Outputs
Cavity Wire
color Terminal
name Description Signal
21-24Climate Control
System Description (cont’d)
CLIMATE CONTROL UNIT 32P CONNECTOR
1 GRY ILL Power source for illumination With lighting switch ON: battery
voltage
2 BRN RrDEF Ry Drives rear window defogger relay
3 LT GRN IG2 IG2 power source With ignition switch ON (II): battery voltage
5 BLK GND Ground for climate control unit (G504)
6 RED ACS Outputs A/C ON signal
7 BLK S5V Outputs sensor 5V With ignition switch ON (II): about 5V
8 BRN Teva Detects evaporator temperature sensor signal
9 LT BLU M-COOL Drives air mix control motor COOL side Drive on COOL side: 7 V 15 V
10 WHT M-VENT Drives mode control motor VENT side Drive on VENT side: about 14.5 V
11 PNK M-HOT Drives air mix control motor HOT side Drive on HOT side: 7 V 15 V
12 GRN M-DEF Drives mode control motor DEF side Drive on DEF side: about 14.5 V
13 YEL BLW-G Outputs power transistor gate
14 BLU BLW-V Feedback signal of power transistor drain voltage
15 ORN REC Drives recirculation control motor REC side Drive on REC side: about 14.5 V
16 PUR FRS Drives recirculation control motor FRESH side Drive on FRESH side: about 14.5 V
18 RED ILL Ground for illumination
19 RED S-COM Ground exclusive for sensor
20 BLU MODE 4 Inputs mode motor signal 4
Wire side of female terminals
08/08/21 14:41:02 61SNR030_210_0025
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21-26Climate Control
Circuit Diagram
PNK
RED/BLK
12
1 2
Q6
1 2
GRN/REDRED
IG2 HOT in ON (II)
CAN HI
CAN LO
FAN HI ACC L
FAN LO A14
A4
A5 13
A/C COMPRESSOR
2
RED/WHT
BLU
F26 MICU
1
19
21
A37
A36
BLK
A9 A33 A16 A19 PNK
WHT RED
1
23
RED
LT GRN
5V
BLK
VCC6
ACPD
TW2 GRN12
SG BLK
No. 15
(7.5 A)
(20 A) No. 6 A/C DIODE A
GRY RED
WHT
LT GRN
BRN
42 3 5
1 IG2
BAT
ORNNo. 36 (10 A)
BRN
BLK RED
BLU
2
1
G301 ECM/PCM
BATTERY
No. 1 (BAT) (100 A)
24
2
3
PUR
13
41 No. 9 (40 A)
No. 2 (IG) (50 A)
1
3
42
WHT
BLK
G301
No.20(7.5A)
1
3
2
4
PUR
UNDER-HOOD FUSE/RELAY BOX IGNITION SWITCH
UNDER-DASH
FUSE/RELAY BOX
RADIATOR
FAN RELAY
FAN CONTROL
RELAY
A/C
CONDENSER
FAN RELAY A/C
COMPRESSOR
CLUTCH RELAY
BLOWER
MOTOR
RELAY
RADIATOR
FAN
MOTOR
PGM-FI
SUB
RELAY
A/C
CONDENSER
FAN
MOTOR
ENGINE
COOLANT
TEMPERATURE
(ECT) SENSOR 2A/C PRESSURE
SENSOR
GAUGE
CONTROL
MODULE
(TACH)
A/C
COMPRESSOR
CLUTCH
UNDER-DASH
FUSE/RELAY
BOX
THERMAL
PROTECTOR
A/C
DIODE B
H1 C3 Q16
G12
D1
F11 F14 F12 F2 F7 F20 E8 F1 J2 No. 7 (20 A)
08/08/21 14:41:03 61SNR030_210_0027
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21-27
RED
(With navigation system)
30 29 28
F3 F2 F4
NAVIGATION UNIT
CLKSO
BLU
RED
YEL 12 V
PURBLU
LT GRN
BRN
BRN
BLU
REAR WINDOW DEFOGGER RELAY DASH LIGHTS
BRIGHTNESS
CONTROLLER
GRY
1
RED 18
2
32 6
PNK 5
3
19 20 21
22 23
12 10 15 16
31 9 11 27 7 24 8 26 25 13 14
G5041
1 2 2
2
YEL
RED REDPNK
LT BLU
RED RED
WHT BLU
LT GRN
PUR
ORN GRN RED
YEL
ORN GRY
PNK
LT BLU YEL
BLU
4
2
1
S-COM
REC
FRS FRD-P S5V
S-COM
M-DEF
M-VENT
MODE 4 MODE 2
MODE 3 MODE 1
2 2 1
BRN
PUR BLK
RED BLK
5V
1
3 5
4 6 1 2
3 5 BLK
CLIMATE CONTROL UNIT 1
2 1
RED
G401GRN
3
WHT
5
3
1
2
BLK
S5V
AMD-P
M-HOT
M-COOLS-COM WHT
7 7
7
DRIVING
CIRCUIT BLOWER
MOTOR
POWER
TRANSISTOR
OUTSIDE AIR
TEMPERATURE SENSOR
AIR MIX
CONTROL
MOTOR
RECIRCULATION
CONTROL
MOTOR
MODE
CONTROL
MOTOR
IN-CAR
TEMPERATURE SENSOR
EVAPORATOR
TEMPERATURE SENSOR
SUNLIGHT SENSOR
No. 14 (7.5 A)
In the under-dash
fuse/relay box SI
: CAN line
B-CAN
08/08/21 14:41:04 61SNR030_210_0028
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NO YES
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YES
NO
DTC B1220 or DTC indicator E and AUTO:
21-2921-29
GAUGE CONTROL MODULE (TACH) 36P CONNECTOR
UNDER-DASH FUSE/RELAY BOX CONNECTOR Q (16P)
PNK
PNK
8. Disconnect under-dash fuse/relay box connector Q (16P).
9. Disconnect the gauge control module (TACH) 36P connector.
10. Check for continuity between under-dash fuse/relay box connector Q (16P) terminal No. 6 and the
gauge control module (TACH) 36P connector
terminal No. 21.
Go to the gauge control module input test
(see page 22-271).
Repair open in the wire between the MICU
and the gauge control module (TACH). 1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure.
5. Turn the ignition switch to LOCK (0).
6. Test the recirculation control motor (see page 21-74).
Go to step 7.
Replace the recirculation control motor
(see page 21-74).
7. Disconnect the recirculation control motor 7P connector (see page 21-74).
8. Disconnect the climate control unit 32P connector.
(cont’d)
A Short in the Recirculation Control Motor
Circuit
Wire side of female terminals Wire side of female terminals
Is there continuity? I s DT C B1220 or E and AU T O i nd i cat ed ?
I s t he r eci r cul at i on cont r ol mot or OK ?
08/08/21 14:41:05 61SNR030_210_0030
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DTC B1241 or DTC indicator P:
21-4721-47
WHT
GRN
CLIMATE CONTROL UNIT 32P CONNECTOR
BLOWER MOTOR 2P CONNECTORJUMPER WIRE GRN
9. Check for continuity between body ground and theclimate control unit 32P connector terminals No. 10
and No. 12 individually.
Repair short to body ground in the wire(s)
between the climate control unit and the mode
control motor.
Go to step 10.
10. Test the mode control motor (see page 21-73).
Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
Replace the mode control motor (see page
21-73), or repair the mode control linkage or
doors. 1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure, check for loose wires or
poor connections on the blower motor circuit.
5. Turn the ignition switch to LOCK (0).
6. Check the No. 9 (40 A) fuse in the under-hood fuse/relay box, and the No. 36 (10 A) fuse in the
under-dash fuse/relay box.
Go to step 7.
Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 9 (40 A) and
No. 36 (10 A) fuses circuit.
7. Connect the blower motor 2P connector terminal No. 2 to body ground with a jumper wire.
(cont’d)A Problem in
the Blower Motor Circuit
Wire side of female terminals
Wire side of female terminals
Is there continuity?I s t he mod e cont r ol mot or OK ? I s DT C B1241 or P i nd i cat ed ?
Ar e t he f uses OK ?
08/08/21 14:42:21 61SNR030_210_0048
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21-49
BLU
YEL
BLU YEL
POWER TRANSISTOR 4P CONNECTOR
CLIMATE CONTROL UNIT 32P CONNECTOR
BLU
YEL
CLIMATE CONTROL UNIT 32P CONNECTOR
BLOWER MOTOR 2P CONNECTOR
WHT
19. Check for continuity between the followingterminals of the climate control unit 32P connector
and the power transistor 4P connector.
32P: 4P:
No. 13 No. 1
No. 14 No. 3
Go to step 20.
Repair open in the wire(s) between the
climate control unit and the power transistor.
20. Turn the ignition switch to ON (II).
21. Measure the voltage between body ground and the climate control unit 32P connector terminals No. 13
and No. 14 individually.
Repair short to power in the wire(s).
Go to step 22. 22. Reconnect the climate control unit 32P connector.
23. Test the power transistor (see page 21-71).
Check for loose wires or poor connections at
the climate control unit 32P connector and at the
power transistor 4P connector. If the connections
are good, substitute a known-good climate control
unit, and recheck. If the symptom/indication goes
away, replace the original climate control unit.
Replace the power transistor.
24. Disconnect the jumper wire.
25. Disconnect the blower motor 2P connector.
26. Measure the voltage between the blower motor 2P connector terminal No. 1 and body ground.
Replace the blower motor.
Go to step 27.
27. Turn the ignition switch to LOCK (0).
28. Remove the blower motor relay from the under- hood fuse/relay box, and test it (see page 22-70).
Go to step 29.
Replace the blower motor relay.
(cont’d)
Wire side of female terminalsWire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there voltage? Is the power transistor OK ?
Is there battery voltage?Is the relay OK ?
08/08/21 14:42:22 61SNR030_210_0050
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21-50Climate Control
DTC Troubleshooting (cont’d)
BLOWER MOTOR RELAY 4P SOCKET
BLOWER MOTOR RELAY 4P SOCKET
BRN BLOWER MOTOR RELAY 4P SOCKET
BLK
29. Measure the voltage between the blower motorrelay 4P socket terminal No. 1 and body ground.
Go to step 30.
Replace the under-hood fuse/relay box
(see page 22-65).
30. Turn the ignition switch to ON (II).
31. Measure the voltage between the blower motor relay 4P socket terminal No. 3 and body ground.
Go to step 32.
Repair open in the wire between the No. 36
(10 A) fuse in the under-dash fuse/relay box and the
blower motor relay. 32. Turn the ignition switch to LOCK (0).
33. Check for continuity between the blower motor
relay 4P socket terminal No. 4 and body ground.
Repair open in the WHT wire between the
blower motor relay and the blower motor.
Check for an open in the wire between the
blower motor relay and body ground. If the wire is
OK, check for poor ground at G301 (see page 22-64).
Is there battery voltage?
Is there battery voltage? Is there continuity?
08/08/21 14:42:23 61SNR030_210_0051
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21-53
Climate Control Power and Ground Circuit Troubleshooting
LT GRN
CLIMATE CONTROL UNIT 32P CONNECTOR BLK
CLIMATE CONTROL UNIT 32P CONNECTOR
1. Check the No. 36 (10 A) fuse in the under-dash fuse/
relay box.
Go to step 2.
Replace the fuse, and recheck. If the fuse
blows again, check for a short in the No. 36 (10 A)
fuse circuit.
2. Disconnect the climate control unit 32P connector.
3. Turn the ignition switch to ON (II).
4. Measure the voltage between the climate control unit 32P connector terminal No. 3 and body ground.
Go to step 5.
Repair an open in the wire between the No. 36
(10 A) fuse in the under-dash fuse/relay box and the
climate control unit. 5. Turn the ignition switch to LOCK (0).
6. Check for continuity between the climate control
unit 32P connector terminal No. 5 and body ground.
Check for loose wires and poor connections
at the climate control unit 32P connector. If
connections are good, substitute a known-good
climate control unit and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
Check for an open in the wire between the
climate control unit and body ground. If the wire is
OK, check for poor ground at G504 (see page 22-64).
Wire side of female terminals Wire side of female terminals
IsthefuseOK?
Is there battery voltage? Is there continuity?
08/08/21 14:42:24 61SNR030_210_0054
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21-56Climate Control
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
RADIATOR FAN RELAY 4P SOCKET
RADIATOR FAN RELAY 4P SOCKET
JUMPER WIRE
BRN
NOTE:  Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom
troubleshooting index.
 Before performing symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Check the No. 7 (20 A) fuse in the under-hood fuse/relay box, and the No. 36 (10 A) fuse in the
under-dash fuse/relay box.
Go to step 2.
Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 7 (20 A) and
No. 36 (10 A) fuses circuit.
2. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see page 22-70).
Go to step 3.
Replace the radiator fan relay.
3. Connect the HDS to the DLC.
4. Turn the ignition switch to ON (II).
5. Turn on the A/C.
6. Check the FAN LOW CTRL in the PGM-FI Data List with the HDS.
Go to step 7.
Substitute a known-good ECM/PCM (see page
11-7), and retest. If the symptom/indication goes
away with a known-good ECM/PCM, replace the
original ECM/PCM (see page 11-228).
7. Turn the ignition switch to LOCK (0). 8. Measure the voltage between the radiator fan relay
4P socket terminal No. 1 and body ground.
Go to step 9.
Replace the under-hood fuse/relay box
(see page 22-65).
9. Connect the radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.
Go to step 10.
Go to step 19.
Ar e t he f uses OK ?
Is the relay OK ?
I s t he F AN LOW CT RL on? Is there battery voltage?
Do t he A/ C cond enser and r ad i at or f ans r un onlow?
08/08/21 14:42:25 61SNR030_210_0057
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