Acura CSX. Manual — part 474
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Celsius to Fahrenheit Conversion Table
Alphanumeric Conversion Table
Alphanumeric Conversion Table (Mode Positioning)
21-14
Climate Control
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
0
32
10
50
20
68
30
86
40
104
1
34
11
52
21
70
31
88
41
106
2
36
12
54
22
72
32
90
42
108
3
37
13
55
23
73
33
91
43
109
4
39
14
57
24
75
34
93
44
111
5
41
15
59
25
77
35
95
45
113
6
43
16
61
26
79
36
97
46
115
7
45
17
63
27
81
37
99
47
117
8
46
18
64
28
82
38
100
48
118
9
48
19
66
29
84
39
102
49
120
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
50
122
60
140
70
158
80
176
90
194
51
124
61
142
71
160
81
178
91
196
52
126
62
144
72
162
82
180
92
198
53
127
63
145
73
163
83
181
93
199
54
128
64
147
74
165
84
183
94
201
55
131
65
149
75
167
85
185
95
203
56
133
66
151
76
169
86
187
96
205
57
135
67
152
77
170
87
188
97
207
58
136
68
154
78
172
88
190
98
208
59
139
69
158
79
174
89
192
99
210
Display Reading
(Alphanumeric)
°C
°F
%
A1 thru A9
1 thru
9
30 thru 16
1 thru
9
B0 thru B9
10 thru
19
14 thru
2
10 thru
19
C0 thru C9
20 thru
29
4 thru
20
20 thru
29
D0 thru D9
30 thru
39
22 thru
38
30 thru
39
E0 thru E9
40 thru
49
40 thru
58
40 thru
49
F0 thru F9
100 thru
109
Display Reading
(Alphanumeric)
Mode Position
2
OVER VENT
A
VENT
8
VENT-HEAT/VENT
c
HEAT/VENT
d
HEAT/VENT-HEAT
9
HEAT
b
HEAT-HEAT/DEF
3
HEAT/DEF
7
HEAT/DEF-DEF
6
DEF
E
OVER DEF
08/08/21 14:40:58 61SNR030_210_0015
SNR9A00G10500000000GAAT80
Checking the DTCs by HDS
DTC
Detection Item or Symptom
ECU
DTC type
Page
21-15
DTC Troubleshooting Index
B1200
Communication bus line error
Climate control
unit
Loss of
communication
(see page 22-107)
B1202
Climate control unit internal error
Climate control
unit
Internal error
(see page 21-28)
B1205
Climate control unit lost communication
with gauge control module (TACH)
(VSP/NE message)
Climate control
unit
Loss of
communication
(see page 21-28)
B1206
Climate control unit lost communication
with gauge control module (TACH) (ECT
message)
Climate control
unit
Loss of
communication
(see page 21-28)
B1207
Climate control unit lost communication
with gauge control module (TACH)
(ILLUMI message)
Climate control
unit
Loss of
communication
(see page 21-28)
B1220
A short in the recirculation control motor
circuit
Climate control
unit
Signal error
(see page 21-29)
B1225
An open in the in-car temperature sensor
circuit
Climate control
unit
Signal error
(see page 21-31)
B1226
A short in the in-car temperature sensor
circuit
Climate control
unit
Signal error
(see page 21-32)
B1227
An open in the outside air temperature
sensor circuit
Climate control
unit
Signal error
(see page 21-33)
B1228
A short in the outside air temperature
sensor circuit
Climate control
unit
Signal error
(see page 21-34)
B1229
An open in the sunlight sensor circuit
Climate control
unit
Signal error
(see page 21-35)
B1230
A short in the sunlight sensor circuit
Climate control
unit
Signal error
(see page 21-36)
B1231
An open in the evaporator temperature
sensor circuit
Climate control
unit
Signal error
(see page 21-37)
B1232
A short in the evaporator temperature
sensor circuit
Climate control
unit
Signal error
(see page 21-39)
B1233
An open in the air mix control motor circuit
Climate control
unit
Signal error
(see page 21-40)
B1234
A short in the air mix control motor circuit
Climate control
unit
Signal error
(see page 21-41)
B1235
A problem in the air mix control linkage,
door, or motor
Climate control
unit
Signal error
(see page 21-42)
B1239
An open or short in the mode control
motor circuit
Climate control
unit
Signal error
(see page 21-44)
B1240
A problem in the mode control linkage,
doors, or motor
Climate control
unit
Signal error
(see page 21-46)
B1241
A problem in the blower motor circuit
Climate control
unit
Signal error
(see page 21-47)
B2983
A problem in the recirculation control
motor linkage, door, or motor
Climate control
unit
Signal error
(see page 21-51)
B2986
An open in the recirculation control motor
circuit
Climate control
unit
Signal error
(see page 21-52)
08/08/21 14:40:58 61SNR030_210_0016
SNR9A00G10500000000HBAT01
Symptom
Diagnostic procedure
Also check for
21-16
Climate Control
Symptom Troubleshooting Index
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•
•
•
•
•
•
•
•
•
•
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–
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•
The blower and heater
controls and the A/C
system do not work
Probable cause: Climate control unit malfunction
Do the climate control power and ground circuit
troubleshooting (see page 21-53)
HVAC DTCs (see page 21-9)
Blown fuse No. 36 (10 A) in the
driver’s under-dash fuse/relay
box
Poor ground at G504 (see page
22-30)
Poor or loose connections at the
terminals
The A/C compressor
clutch and the A/C
condenser/radiator
fans are inoperative,
but the blower and
heater controls work
Probable cause: A/C pressure sensor circuit
malfunction
Troubleshoot the pressure sensor circuit:
A/C pressure sensor circuit low voltage
(see page 11-301)
A/C pressure sensor circuit high voltage
(see page 11-303)
NOTE: The A/C pressure sensor can malfunction
without setting a DTC
HVAC DTCs (see page 21-9)
Powertrain DTCs (see page
11-3)
A/C signal circuit
troubleshooting (see page
21-64)
Poor or loose connections at the
terminals
The A/C compressor
clutch does not engage,
but the A/C condenser/
radiator fans operate,
and the blower and
heater controls work
Probable cause: No power to the A/C compressor
clutch
Do the A/C compressor clutch circuit
troubleshooting (see page 21-62)
HVAC DTCs (see page 21-9)
Blown fuse No. 20 (7.5 A) in the
under-hood fuse/relay box
A/C system pressure is normal
(see page 21-21)
A/C thermal protector has
continuity (see step 4 on page
21-85)
Poor or loose connections at the
terminals
The A/C condenser fan
and/or the radiator fan
do not run with the A/C
on
Probable cause: Condenser/radiator fan low
speed circuit malfunction
Do the radiator and A/C condenser fan low speed
circuit troubleshooting (see page 21-56)
HVAC DTCs (see page 21-9)
Powertrain DTCs (see page
11-3)
Blown fuse No. 7 (20 A) in the
under-hood fuse/relay box
Poor ground at G301 (see page
22-22)
Poor or loose connections at the
terminals
The condenser/radiator
fans do not run at high
speed, but do run at
low speed
Probable cause: Malfunction in the fan(s) high
speed circuit
Do the following troubleshooting as needed:
A/C condenser fan high speed circuit
troubleshooting (see page 21-60)
Radiator fan high speed circuit troubleshooting
(see page 10-26)
HVAC DTCs (see page 21-9)
Powertarin DTCs (see page
11-3)
Blown fuse No. 6 (20 A) and/or
No.7 (20 A) in the under-hood
fuse/relay box
Poor ground at G301 (see page
22-22)
Poor or loose connections at the
terminals
Voice commands do
not work
Probable cause: Communication problem
between the climate control unit and the
navigation system
Do the navigation communication line circuit
troubleshooting (see page 21-54)
HVAC DTCs (see page 21-9)
Navi system link (see page
23-135)
Poor or loose connections at the
terminals
08/08/21 14:40:58 61SNR030_210_0017
Symptom
Diagnostic procedure
Also check for
21-17
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–
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•
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•
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•
•
Blower fan runs slower
than expected in cold
weather (when in
AUTO mode)
NOTE: It is normal for
the blower fan to run
slowly until the coolant
temperature rises
when in AUTO mode
Probable cause: Engine coolant temperature
(ECT) circuit malfunction
Troubleshooting the ECT sensor circuit:
ECT sensor 2 circuit low voltage (see page
11-170)
ECT sensor 2 circuit high voltage (see page
11-172)
HVAC DTCs (see page 21-9)
Powertrain DTCs (see page
11-3)
Blower motor operation
The A/C compressor
clutch cycles rapidly on
and off
Probable cause: A/C system is very low on
refrigerant, indicating a possible leak
Do the refrigerant leak check (see page 21-93)
and repair any leaks. Replace the receiver/dryer
(see page 21-89), then recharge the system to
specifications (see page 21-92)
HVAC DTCs (see page 21-9)
If there is no leak and the
refrigerant level is normal, do
the A/C compressor clutch
circuit troubleshooting
(see page 21-62), and look for
an intermittent problem
Warm air comes out of
the vents, and the high
pressure liquid line is
very hot
Probable causes: The A/C system is overcharged
(too much refrigerant), or the condenser is
malfunctioning
Recover A/C refrigerant (see page 21-90), then
check the condenser for restrictions or poor
airflow. Repair as needed. Recharge the system
to specifications (see page 21-92)
Incorrect tension or abnormal
wear on the drive belt. Replace
the belt and/or the belt
tensioner as needed
Proper operation of the
condenser/radiator fans. Repair
as needed
Signs of an overheated engine.
Repair as needed
Warm air comes out of
the vents. The suction
line is cool to warm,
and the discharge line
is warm to hot
Probable cause: A/C system is low on refrigerant,
indicating a possible leak
Do the refrigerant leak check (see page 21-93)
and repair any leaks. Recharge the system to
specifications (see page 21-92)
HVAC DTCs (see page 21-9)
Add refrigerant oil depending
on the part you replaced
(see page 21-7)
Warm air comes out of
the vents. The suction
line is cool to warm,
the discharge line is
warm to hot, and there
is no frost on the
expansion valve
Probable cause: Excessive air and/or moisture in
the system, indicating a possible leak
Do the refrigerant leak check (see page 21-93)
and repair any leaks. Replace the receiver/dryer
(see page 21-89), then recharge the system to
specifications (see page 21-92)
HVAC DTCs (see page 21-9)
Check the amount of refrigerant
oil in the system. Adjust the oil
level as needed
Warm air comes out of
the vents. The liquid
line or the condenser
outlet is abnormally
cool, or there is frost or
condensation on the
receiver/dryer
Probable cause: A restriction in the high-pressure
side of the system
Recover A/C refrigerant (see page 21-90), then
check the liquid line, the receiver/dryer, and the
condenser for restrictions. Repair as needed.
Recharge the system to specifications (see page
21-92)
HVAC DTCs (see page 21-9)
There is heavy frost or
condensation on the
expansion valve, and
frost on the suction line
Probable cause: A restriction in the low-pressure
side of the system
Recover A/C refrigerant (see page 21-90), then
check the suction line and the expansion valve
for restrictions. Repair as needed. Recharge the
system to specifications (see page 21-92)
HVAC DTCs (see page 21-9)
08/08/21 14:40:59 61SNR030_210_0018
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