Acura CSX. Manual — part 473
How to Use the Self-diagnostic Function with the HDS
21-10
Climate Control
1. Make sure the ignition switch is in LOCK (0).
2. Connect the HDS to the data link connector (DLC).
3. Turn the ignition switch to ON (II).
4. Make sure the HDS communicates with the vehicle and the climate control unit. If it doesn’t, troubleshoot the DLC
circuit (see page 11-204).
5. Select HVAC/CLIMATE CONTROL in the BODY ELECTRICAL menu.
6. Select INSPECTION in the HVAC/CLIMATE CONTROL menu.
7. Select CLIMATE CONTROL SELF TEST in the INSPECTION menu.
8. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC troubleshooting.
NOTE:
• After troubleshooting, clear the DTCs with the HDS.
• For specific operations, refer to the user’s manual that came with the HDS.
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02
01
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.
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03
Checking for DTCs
DTC
(Temperature
Indicator
Segment and
AUTO
Indicator)
Detection Item
21-12
Climate Control
AUTO INDICATOR
N
M
TEMPERATURE INDICATOR
E
G 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)
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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 Value
1
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).
2
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