2003 SSANGYONG MUSSO ignition

7D-8 FATC-HAVC Self-diagnosis Method
Ignition switch “ON ”
Press the intake switch more than 4 times within
2 seconds while pressing the AUTO switch
Self-diagnosis will start after turning off all displays on VFD for 2.5 seconds
Self-diagnosis items check (continuous action)
Airconditioner control
Self-diagnosis items check
(step action)
Press AUTO Press AUTO Press OFF
Press OFF
DIAGNOSIS TEST
FATC airconditioner system has self-diagnosis function.
Turn the ignition switch ON and press intake switch more than 4 times within 2 seconds while the AUTO switch is
1 AUTO Switch
2 Intake Switch
3 OFF Switch 4 Airconditioner Switch
5 Set temperature Display
pressed, then it will diagnose incar sensor, ambient
sensor, water temperature sensor and temperature actuator for open/short and will display numerical fault code on the set temperature display of VFD.
DIAGNOSIS

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.

FATC-HAVC 7D-19
Fault : intake (recirculation/fresh air) door inoperative
Remove the glove box.
Measure voltage between 6c terminal positive pole (+)
and bo dy (-).
Measured voltage is 12V.Check No. 24 fuse (15A) in the box.
Turn the ignitin switch OFF and disconnect harness of
the intake actuator.
Ye s No
Disconnect 3-pin connector of the intake mode actuator and turn the ignition switch to ON position.
6A
6B 6C
Check that it operates toward each direction after connecting the battery to the 6C terminal of intake
actuator and ground 6A & 6B to the body.6C 6B 6A
Wiring side connector
Actuator connector
Intake actuator is normal.
Ye s
Repair and replace the intake actuator.
No
Check intake actuator linkage and door for
proper operation and repair if necessary.Disconnect 20-pin connector from the airconditioner control unit.
Check current between the intake actuator (6A, 6B) and the airconditioner control unit (6,7).
Is there current?
Ye s
Repair open wire between the intake actuator and the control unit.
No
Replace the good control unit and re-check. If no fault, replace the control panel.
67

0.5YB

0.5LgR
+
-

7D-20 FATC-HAVC Fault : air flow does not change toward panel side.
8H
Remove the center panel of the instrument panel.
Measure voltage between 8I terminal positive pole (+) and body (-).
Measured voltage is 12V.Check No. 24 fuse (15A) in the fuse box.
Turn the ignition switch OFF and disconnect harness of
the mode actuator.
Ye sNo
Disconnect 8-pin connector of the mode actuator and turn the ignition switch to ON position.
Check that it operates toward each directions when
ground is connected to terminal (8J, 8H, 8F, 8D, 8B) of
the mode actuator alternatively.
Mode actuator
connector
Mode actuator is normal.
Ye s
Repair and replace the mode actuator.
No
Check the intake actuator linkage and door
for proper operation and repair if necessary.Disconnect 20-pin connector from the airconditioner control unit.
Check current between the mode actuator (8J, 8H, 8F,
8D, 8B) and the airconditioner control unit (11, 12, 13,14, 15).
Is there current?
Ye s
Repair open wire between the mode actuator and the control unit.
No
Replace the good control unit and re-check. If no fault, replace the control panel.
14 15
+
-
8
IWiring side connector
8I
8J 8H 8F 8D 8B 8A
Mode actuator connector Control unit connector
12 13
11
8B 8D 8F 8J