SSANGYONG KORANDO 2013 Service Manual

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5. PTC HEATER OPERATION PROCESS
1) PTC Heater Input/Output Factors
The engine ECU controls the PTC (Positive Temperature Coefficient) heater system by adjusting the
power supplied to the PTC system according to the two measured temperature values from the engine
coolant temperature sensor and HFM sensor. This system is mounted to the heater air outlet in the air
condition system module and heats the air which flows to the passenger room. Since the PTC system is
heated by the electrical power, the electric load and alternator capacity is greater than the conventional
one. The PTC is not operated when a) the engine is cranking, b) the battery voltage is below 11 V, c) the
glow plug is being preheated.
The ceramic PTC features that the resistance rises quickly in a certain temperature range. The PTC
heater has 3 circuits with power of 330 W. While only 1 circuit in the PTC heater is connected during
PTC1 operation, 2 circuits are connected during PTC2 or PTC3 operation.

2) Control Condition For PTC Heater
Operation Operating condition PTC heater status
HI mode operation
(PTC2, 3)PTC heater operates in
"HIGH" mode if operating
conditions are met
LO mode operation
(PTC1)PTC heater operates in
"LOW" mode if operating
conditions are met
Conditions for
deactivating
Air conditioner blower switch OFF
When the ambient temperature sensor is
faulty (short or open circuit in the wiring)
Engine is cranking
Battery voltage is 11 V or less
Glow plug is being preheated (Glow indicator
comes on) -
-
-
-
-
-
-
-
-
Conditions for PTC heater "LOW" operation mode (2nd step)

6. CIRCUIT DIAGRAM

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1. SPECIFICATIONS
Item Item Specification
Air bag unit (SDM)Voltage range 8.0 V to 16.0 V
Voltage for system diagnosis and
SDM self diagnosis8.0 V to 16.0 V
Voltage for communication
between front and side impact
sensors7.0 V to 16.0 V
Storage temperature
Operating temperature
Air bag module and seat belt
pretensioner0.4 A for 10 seconds
1.2 A for 2 ms
Front and side impact sensorsOperating temperature
Power voltage 5.0 to 11.0 V
Measurement range 5.0 to 11.0 V
Contact CoilRated voltage 12.0 V
Voltage range 9.0 V to 16.0 V
Air bag circuit resistance
Current capacity 5.0 A
Rotation 2.1 rotations for each (LH/RH)
direction
Replacement interval Change at every 10 years

2. MAJOR CHANGES
Air bag unit (SDM)
Air bag unit (SDM)
- The logic for the air bag warning lamp operation has been changed.
- Event data recorder (EDR) function has been added.
Passenger air bag module
Passenger air bag module
The air bag module type has been changed to "Invisible".

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Impact sensor
Front impact sensor
The appearance of the front impact sensor has been changed.
Side impact sensor
The appearance of the side impact sensor has been changed.

3. CAUTIONS FOR AIR BAG SYSTEM
Cautions for air bag maintenance
Whenever installing or removing the devices related to the air bag system, disconnect the negative
battery cable and wait for at least 30 seconds.
Do not connect a tester probe to the inflator to measure the resistance of the component of the air
bag system. The detonator of the inflator may explode due to a sudden extra power supplied by the
tester.
Note that the used components related to the air bag system, especially the air bag unit, should be
packed in an air tight container and prevent it from any impact or damage.
When there is any deployed air bag (including curtain air bag and seat belt pretensioner), the entire
system including the air bag unit should be replaced. The deployed air bag unit should not be reused
since it has status data when it is deployed, and the data cannot be cleared with a diagnostic device.
The air bag and seat belt pretensioner systems contain explosive charges, so handle carefully when
disposing or replacing them. 1.
2.
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4.
5.
Cautions for air bag maintenance
Do not modify, change or apply impact on any air bag component. The air bag may be deployed
abruptly, causing serious injuries.
Children and infants should ride in a rear seat. Seating in the passenger seat with carrying a
child or infant is strictly prohibited. An infant or a child could be severely injured by the air bag
deployment.
A child restraint system must not be installed on the front seat. An infant or a child could be severely
injured by the air bag deployment when it is fitted to the passenger seat.
Do not place any objects on the air bag inflation location. You may get injured by those objects during
deployment.
Never put your arms around the front seat from behind, lean on the front seatback, or put your arms
out of the window. You can severely injured when the side air bag deploys.
Never lean on the door since it becomes very dangerous when the side air bag deploys.
The side air bag deploys when there is a severe side collision.
Do not slam the front door to close it. The side air bag may deploy unexpectedly.
When an occupant fastens the seat belt in an unstable or inclined posture, the air bag system cannot
protect the occupant properly. Moreover, the occupant can be injured by the air bag.
Do not move your seat too close to the steering wheel or dashboard. Being too close to the
steering wheel or instrument panel during the air bag deployment could cause serious injury,
including death
Hold only the outer rim of the steering so that the air bag can inflate without any hindrance.
Do not incline toward the steering wheel. Never allow the passenger to put hands or feet on the dash
board. The air bag cannot work properly Do not hold and operate the steering wheel by crossing your
arms You could get seriously injured when the air bag deploys. 1.
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A large quantity of non-toxic gas (nitrogen gas) is generated with a loud noise when the air bag or
seat belt pretensioner deploys. If these airborne particles irritate your skin, eyes, nose, or throat, rinse
the area with cool water. If the irritation continues, see your doctor.
The windshield glass may be broken when the passenger air bag deploys.
The air bag is a unit to save an occupant's life from a sudden accident and it inflates at a very fast
speed by gas with high temperature, which might cause injury, such as an abrasion, bruise and burn
depending on the accident conditions.
The air bag components will be very hot after deployment. Do not touch them.
The deployed air bag/seat belt pretensioner cannot deploy again. It will work when an additional
impact is applied. Once the air bag system is triggered, the triggered air bag assembly should be
removed from the vehicle and replaced with a new one.
The air bag warning lamp is illuminated for 3 to 7 seconds after the engine is started to check
the system. If this warning lamp remains ON, then the system may be defective. Have the air
bag system checked immediately by Ssangyong Dealer or Ssangyong Authorized Service
Operation.
Incorrect inspection can result in serious injuries or malfunctions in the air bag and seat belt
pretensioner system. 12.
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