2006 ACURA CSX climate control



How to Use the Self-diagnostic Function without the HDS
Except Type S model
Type S model
Canceling the Self-diagnostic Function
21-11
AUTO BUTTON AUTO INDICATOR MODE BUTTON
TEMPERATURE INDICATOR
RECIRCULATION BUTTON A/C BUTTON
MODE BUTTON TEMPERATURE INDICATOR
RECIRCULATION BUTTON
A/C BUTTON AUTO BUTTON
AUTO INDICATOR
The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following:
1. Make sure the ignition switch is in LOCK (0).
2. Press and hold the AUTO and RECIRCULATION buttons, turn the ignition switch to ON (II), then release the AUTO and RECIRCULATION buttons.
3. All LCD segments come on for 2 seconds, then self-diagnostic function begins.
NOTE: The blower motor will run at various speeds when in the self-diagnostic mode, regardless of what the
panel is displaying. If there is any problem in the system, the temperature indicator will light up the segment (A through P) and AUTO indicator corresponding to the error. The temperature indicator will then alternate every second between
displaying ‘‘88’’ (all segments lit) and the error code segment (A through P) and AUTO indicator. To determine
the meaning of the DTC, refer to checking for DTCs.
 If there are no problems detected, the segments will not illuminate, and the system will appear to be turned off.
4. Turn the ignition switch to LOCK (0) to cancel the self-diagnostic function. After completing repair work, run the self-diagnostic function again to make sure that there are no other DTCs.
(cont’d)
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Checking for DTCs
DTC
(Temperature Indicator
Segment and AUTO
Indicator) Detection Item
21-12Climate Control
General Troubleshooting Information (cont’d)
AUTO INDICATOR
NM
TEMPERATURE INDICATOR
EG C
D
H
P
K
L
F
B A
J
The temperature display indicates single or multiple DTCs. If indicator segments A, C, E, G, J, M, and AUTO are on at
the same time, there may be an open in the common ground wire. If no DTCs are present, the indicator remains blank.
A An open in the in-car temperature sensor circuit (see page 21-31)B A short in the in-car temperature sensor circuit (see page 21-32)
C An open in the outside air temperature sensor circuit (see page 21-33)
D A short in the outside air temperature sensor circuit (see page 21-34) E An open in the sunlight sensor circuit (see page 21-35)F A short in the sunlight sensor circuit (see page 21-36)
G An open in the evaporator temperature sensor circuit (see page 21-37) H A short in the evaporator temperature sensor circuit (see page 21-39) J An open in the air mix control motor circuit (see page 21-40)
K A short in the air mix control motor circuit (see page 21-41) L A problem in the air mix control linkage, door, or motor (see page 21-42)
M An open or short in the mode control motor circuit (see page 21-44) N A problem in the mode control linkage, doors, or motor (see page 21-46) P A problem in the blower motor circuit (see page 21-47)
A and AUTO An open in the recirculation control motor circuit (see page 21-52) B and AUTO A problem in the recirculation control linkage, door, or motor (see page 21-51)
C and AUTO Climate control unit internal error (see page 21-28)
D and AUTO Climate control unit lost communication with gauge control module (TACH) (ILLUMI message) (see page 21-28)
E and AUTO A short in the recirculation control motor circuit (see page 21-29) F and AUTO Climate control unit lost communication with gauge control module (TACH) (ECT message) (see page 21-28)
J and AUTO Climate control unit lost communication with gauge control module (TACH) (VSP message) (see page 21-28)
K and AUTO Communication bus line error (see page 22-106) L and AUTO Climate control unit lost communication with gauge control module (TACH) (NE message) (see page 21-28)
08/08/21 14:40:58 61SNR030_210_0013
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Displaying Sensor Inputs at the Climate Control Unit
Check these items before using the sensor input display mode
To run the sensor input display mode, follow these steps
21-13
The climate control unit has a mode that displays the sensor inputs it receives. This mode shows you what data the
climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is
faulty.1. Turn the ignition switch to ON (II), and check the recirculation door function; press the recirculation button to switch from FRESH to RECIRC. The air volume and sound should change slightly.
2. Set the temperature control knob to the desired test temperature. When selecting the test temperature, note these items:
 ‘‘Lo’’ temperature setting will default to MAX COOL, VENT, and RECIRC.
 ‘‘Hi’’ temperature setting will default to MAX HOT, FLOOR, and FRESH.
 19 through 31 °C settings will use the automatic climate control logic.
3. Turn the ignition switch to LOCK (0).
1. Turn the ignition switch to LOCK (0).
2. Press and hold both the AUTO and MODE buttons, then start the engine.
3. After the engine starts, release both buttons. The display panel will flash the sensor number and then the value for that sensor. Record the value displayed.
4. To advance to the next sensor, press the A/C button. Sensor Item Displayed Value1 Mode Positioning BIT
2 In-car Temperature °C
3 Outside Air Temperature °C
4 Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy = 10, Sunny = 65 10 kcal/m ·h
5 Evaporator Outlet Air Temperature °C
6 Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution) % of opening
7 Recirculation Opening % of opening
8 Vehicle Speed (Vehicle must be driven to display speed) km/h
9 Engine Coolant Temperature °C
A Vent Temperature Air Out (TAO) °C
NOTE:  The sensor values will be displayed in degrees Celsius (°C) or an alphanumeric code. Use the chart to convert the value to degrees Fahrenheit (°F).
 If the sensor value displays ‘‘Er’’ this indicates there is an open or short in the circuit or sensor. Check for DTCs using the HDS, or use the climate control self-diagnostic function.
 If necessary, compare the sensor input display to a known-good vehicle under the same test conditions.
 If the sensor is out of the normal range, refer to the sensor test or substitute a known-good sensor, and recheck.
5. To cancel the sensor input display mode, press the AUTO button or turn the ignition switch to LOCK (0). (cont’d)
2
08/08/21 14:40:58 61SNR030_210_0014
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µµµµ
µµ µ µµ
µµ µµ µµ
µµ µµ µµ
µµ µµ µµ ••• •••´ ´
Celsius to Fahrenheit Conversion Table
Alphanumeric Conversion Table
Alphanumeric Conversion Table (Mode Positioning)
21-14
Climate Control
General Troubleshooting Information (cont’d)
°C °F °C °F °C °F °C °F °C °F
0 3210502068308640104
1 3411522170318841106
2 3612542272329042108
3 3713552373339143109
4 3914572475349344111
5 4115592577359545113
6 4316612679369746115
7 4517632781379947117
8 46186428823810048118
9 48196629843910249120
°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 49F0 thru F9 100 thru 109
Display Reading (Alphanumeric) Mode Position
2OVERVENT
AVENT 8 VENT-HEAT/VENTc HEAT/VENT
d HEAT/VENT-HEAT 9HEAT
b HEAT-HEAT/DEF 3 HEAT/DEF
7 HEAT/DEF-DEF
6DEF
EOVERDEF
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(#'
) Checking the DTCs by HDSDTC 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
unitSignal error (see page 21-29)
B1225 An open in the in-car temperature sensor circuit Climate control
unitSignal error (see page 21-31)
B1226 A short in the in-car temperature sensor circuit Climate control
unitSignal error (see page 21-32)
B1227 An open in the outside air temperature sensor circuit Climate control
unitSignal error (see page 21-33)
B1228 A short in the outside air temperature sensor circuit Climate control
unitSignal error (see page 21-34)
B1229 An open in the sunlight sensor circuit Climate control unitSignal error (see page 21-35)
B1230 A short in the sunlight sensor circuit Climate control unitSignal error (see page 21-36)
B1231 An open in the evaporator temperature sensor circuit Climate control
unitSignal error (see page 21-37)
B1232 A short in the evaporator temperature sensor circuit Climate control
unitSignal error (see page 21-39)
B1233 An open in the air mix control motor circuit Climate control unitSignal error (see page 21-40)
B1234 A short in the air mix control motor circuit Climate control unitSignal error (see page 21-41)
B1235 A problem in the air mix control linkage, door, or motor Climate control
unitSignal error (see page 21-42)
B1239 An open or short in the mode control motor circuit Climate control
unitSignal error (see page 21-44)
B1240 A problem in the mode control linkage, doors, or motor Climate control
unitSignal error (see page 21-46)
B1241 A problem in the blower motor circuit Climate control unitSignal error (see page 21-47)
B2983 A problem in the recirculation control motor linkage, door, or motor Climate control
unitSignal error (see page 21-51)
B2986 An open in the recirculation control motor circuit Climate control
unitSignal error (see page 21-52)
08/08/21 14:40:58 61SNR030_210_0016
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(#'
)
Symptom Diagnostic procedure Also check for
21-16
Climate Control
Symptom Troubleshooting Index







 –
– 




 





 





 –
– 





 


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
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SymptomDiagnostic procedure Also check for
21-18Climate Control
Symptom Troubleshooting Index (cont’d)





 


 


 –
– 


 

Warm air comes out of
the vents, and there is
frost on the expansion
valve
Probable cause: The expansion valve is stuck
closed
Replace the expansion valve (see page 21-80)
HVAC DTCs (see page 21-9)
Check the old expansion valve
for contamination. If
contaminants are found,
replace the A/C system
component that caused the
contamination
The temperature of the
liquid line is the same
on both sides of the
expansion valve, and
the evaporator coil or
suction line has heavy
condensation Probable cause: The expansion valve is stuck
open
Replace the expansion valve (see page 21-80)
HVAC DTCs (see page 21-9)
Check the old expansion valve
for contamination. If
contaminants are found,
replace the A/C system
component that caused the
contamination
Warm air comes out of
the vents, but
operation is normal
otherwise Probable cause: Compressor failure
Do the A/C system test (see page 21-99), and
correct any problems. If necessary, replace the
compressor (see page 21-83) HVAC DTCs (see page 21-9)
Add refrigerant oil depending
on the part you replaced
(see page 21-7)
Driver’s and
passenger’s side vent
temperatures vary by
more than 11 °C (20 °F) Probable causes: The recirculation control door
or the air mix door is malfunctioning
Do the following troubleshooting:
Recirculation control motor test (see page
21-74)
Air mix control motor test (see page 21-72) HVAC DTCs (see page 21-9)
Poor or loose connections at the
terminals
Insufficient heating 1. 2.
3.
4.
5.
6.
7.Check the coolant level (see page 10-7)
Check the radiator cap (see page 10-4)
Check the coolant temperature during normal
operation
Check the heater core inlet hose temperature:
If it is COLD, check for restrictions in the hose,
a damaged or leaking thermostat, or a
damaged or leaking water pump
If it is HOT, check for restrictions in the
heater core. Back flush or replace the heater
core
Do the air mix control motor test (see page
21-72)
Check the blower motor unit for obstructions
Check for air leaks around the ducts and vents HVAC DTCs (see page 21-9)
Damaged cylinder head gasket
08/08/21 14:40:59 61SNR030_210_0019
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Oil Separator
21-20Climate Control
System Description (cont’d)
OUTLET SIDE
(To A/C condenser)
OIL SEPARATOR
FROM INSIDE
A/C COMPRESSOR
INLET SIDE
(To inside
A/C compressor)
EVAPORATOR
A/C COMPRESSOR A/C CONDENSER
EXPANSION VALVE
HIGH REFRIGERANT OIL FLOWLOW REFRIGERANT OIL FLOW
OIL SEPARATOR
Oil emission from the A/C compressor to the A/C line is reduced by placing the oil separator in the A/C compressor.
This results in a thinner oil film inside of the heat exchangers (A/C condenser and evaporator). Air conditioning
efficiency is increased without sacrificing engine performance.
08/08/21 14:41:00 61SNR030_210_0021
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