2003 SSANGYONG MUSSO air condition

7D-10 FATC-HAVC Fault Safety Function
FATC airconditioner system not only performs self-diagnosis but also has safety function against faults if there is open or
short in the incar sensor, ambient sensor, water temperature
sensor and temperature door potentiometer.
NO.ItemDefects
Fault safety function
1Incar sensor Open or short Control When substituted 25 °C
2
Ambient sensor Control When substituted 20°C
3
Water temperature sensor Perform heating maneuver control function under
refrigeration maneuver control entering conditions
and release after 10 minutes.
4 Temperature door potentiometer Set temperature 17 - 24.5
°C:max. COLD position
Set temperature 25 - 32 °C:max. HOT position
Open or short Open or short Open or short

FATC-HAVC 7D-11
1 AUTO Switch
2 MODE Switch
3 OFF Switch
4 Temperature UP/DOWN Switch
5 Defrost Switch6 Airconditioner Switch
7 Recirculation

fresh Air Switch
8 Blower Switch (UP/DOWN)
9 VFD (Vacuum Fluorescent Display)
MAINTENANCE AND REPAIR
FATC CONTROL PANEL Components

7D-12 FATC-HAVC Pin Number and Connection Circuit
Pin No.1 Connection circuit
2 3456789
10 11
1213141516
Rheostat Tail lamp
Battery (+)
Power TR (B) Power TR (C)
Temperature actuator (CCW) IG2
Ground
Airconditioner switch ground HI speed relay
Photo sensor (+)
Photo sensor (-)
Temperature actuator F/B
Temperature actuator (CW) IG2
Ground
Connector A
Pin No.
1 Connection circuit
2 345 6 789
101112131415
Incar sensor (+)
Ambient sensor (+) Coolant sensor (+)
Sensor voltage 5V Sensor ground
Intake (ambient) Intake (incar)
- --
VENT
B/L
FLR MIX
DEF
--- - -
Connector B
17 18
19
20
16

FATC-HAVC 7D-13
Removal & Installation Procedure
1. Turn the ignition switch to OFF position.
2. Remove the digital clock.
3. Unscrew the screw from the center panel, pull out eachswitches and remove the center panel.
4. Unscrew the 6 screws and remove the audio control panel assembly.
5. Unscrew the 4 screws and remove the airconditioner control panel assembly.
6. Installation should follow the removal procedure in the reverse order.

FATC-HAVC 7D-15
TROUBLESHOOTING Check and Service Incar sensor is a sensor that detects interior air temperature and a thermistor that decreases its resistance when temperature up and increases when temperature down.
1. Check that there are incar sensor fault code (11,12) by using self-diagnosis function.
2. Disconnect incar sensor 2-pin connector that installed on
inner lower instrument panel cover of driver ’s side and
remove the sensor.
3. Check that measured resistance value among incar sensor terminals is as shown in the right side graph. Notice Measure resistance value by soaking the sensor in the ice water and check changes in resistance values after soaking
it in the very hot water.
4. If resistance value is out of specification, replace the incar sensor.
5. Install the sensor and turn the ignition switch to ON position and check that voltage between No. 12A terminal of incar
sensor and body (-) is 5V.
6. Check current between the No. 12B and 12A connector terminals of the incar sensor and the No. 1 and 5 connector terminals of the airconditioner control unit and repair the wire if defective.

7D-16 FATC-HAVC
910
Ambient sensor connector
2

0.5W
Airconditioner control unit connector
V
5

0.5BL
Ambient Sensor Ambient sensor is a sensor that detects ambient temperature and a thermistor that decreases its resistance when temperature up and increases when temperature down.
1. Check that there are ambient sensor fault code (13,14) by
using self-diagnosis function.
2. Disconnect ambient sensor 2-pin connector that installed on front right side of the frame and remove the sensor.
3. Check that measured resistance value among ambient sensor terminals is as shown in the right side graph. Notice Measure resistance value by soaking the sensor in the ice water and check changes in resistance values after soaking
it in the very hot water.
4. If resistance value is out of specification, replace the ambient sensor.
5. Install the sensor and turn the ignition switch to ON position and check that voltage between No. 10 terminal of the
ambient sensor and body (-) is 5V.
6. Check current between the No. 10 and 9 connector terminals of the ambient sensor and the No. 2 and 5 connector terminals of the airconditioner control unit and repair the wire if defective.

FATC-HAVC 7D-17
7b7a
Water sensor connector
3

0.5RB
Airconditioner control unit connector
V
5

0.5BL
Water Sensor
Water sensor is a thermistor that detects engine coolant temperature to operate the blower speed to LO when water temperature is less than 50.
1. Check that there are water sensor fault code (15,16) by
using self-diagnosis function.
3. Check that measured resistance value among water sensor terminals is as shown in the right side graph. Notice Measure resistance value by soaking the sensor in the ice water and check changes in resistance values after soaking
it in the very hot water.
4. If resistance value is out of specification, replace the water sensor.
5. Install the sensor and turn the ignition switch to ON position and check that voltage between No. 7a terminal of the water
sensor and body (-) is 5V.
6. Check current between the No. 7a and 7b connector terminals of the water sensor and the No. 3 and 5 connector terminals of the airconditioner control unit and repair the wire if defective.
2. Disconnect water sensor 2-pin connector that installed on
the heater unit of inner instrument panel and remove the
water sensor.

7D-18 FATC-HAVC Sun load Sensor Sun load sensor is a photo diode that detects lights. Resistance of diode can be measured as current by using multimeteraccording to increasing sun loads.
1. Check current on the circuits between the sun load sensorand the airconditioner control unit.
2. Turn the ignition switch to ON position and check that voltage between No. 13a terminal of the sun load sensor and vehicle
ground is 5V.
3. Measure current between No. 13a terminal of the sun load sensor and No. 11 terminal of the control unit and check it isas shown in the below graph.
4. If current value is out of specification, replace the sun load sensor.