lamp SSANGYONG KORANDO 2013 Service Manual

4. AIR BAG SYSTEM SELF DIAGNOSIS
1) Air Bag Unit (SDM) Self Diagnosis
The air bag unit monitors the internal/external devices of the air bag system including battery voltage,
limits certain functions of the air bag, and turns on the air bag warning lamp on the instrument cluster
according to the conditions.
Conditions for detecting and clearing faults
The time for detecting errors and clearing the errors is as follows:
Monitoring system Diagnosis
cycleTime for
detectingTime for
clearingClearing fault
Inflator circuit 400 ms 4 seconds 8 seconds with a diagnostic device
warning lamp circuit 100 ms 4 seconds 8 seconds with a diagnostic device
Battery voltage 10 ms 4 seconds 4 seconds with a diagnostic device
Impact sensor IGN ON 1 seconds2 to 4
seconds
(next Ign)with a diagnostic device
Impact record
(air bag deployed)-
Immediately-
by replacing SDM
(cannot be cleared with a
diagnostic device)
SDM internal fault--
by replacing SDM
(cannot be cleared with a
diagnostic device)

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Air bag warning lamp
2) Air Bag Warning Lamp
The air bag unit turns on the air bag warning lamp on the instrument cluster for 6 seconds after IGN ON
while performing self diagnosis for the air bag system. If no fault is found in the system, it turns off the
warning lamp. After this, the unit monitors the system regularly, and notifies the driver by turning on the
air bag warning lamp when a fault is found in the system.
System normal
Comes on for 6 seconds after IGN ON and then goes out.
The air bag warning lamp comes on when: *
diagnosis is performed for the inside/external devices of
the system when the ignition is turned on
the air bag system is malfunctioning
the air bag unit and a diagnostic equipment communicate
each other -
-
-
(1) Air bag warning lamp ON at initial IGN ON

System malfunctioning
Comes on for 6 seconds after IGN ON and goes out for 1 second, and then remains on.
(2) Air bag warning lamp operation during driving
The air bag warning lamp comes on when the air bag unit (SDM) detects a system malfunction. The
warning lamp goes out when the malfunction disappears.

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3) Supply Voltage Monitoring
The air bag unit monitors the battery voltage continuously while the ignition is turned on.. It limits certain
functions of the air bag system and outputs DTC and air bag warning lamp signal according to the result
of the monitoring.
Abnormal voltage of the air bag unit (too high/too low) is determined to be fault only when the signal
is detected for continuous 4 seconds.
Emergency power function
The SDM has an emergency power function that ensures the internal operation of the central unit
and buffering firing circuits for a minimum of 150 ms after loss of battery power. Full emergency
power capability is available after the minimum specified operating voltage has been applied to the
SDM power line for 10 seconds, and from this point, air bag deployment and EDR are enabled.

4) Internal monitoring
The air bag unit checks the status of the air bag system and monitors the system for internal errors. If
an error is detected by self diagnosis, this unit disables part of the air bag system functions and outputs
a diagnostic trouble code (DTC) and air bag warning lamp signal.
Watchdog
The micro controller is monitored periodically. And if a fault is found, micro controller is reset, inflator
ignition function is limited, and the air bag warning lamp comes on. -
Air bag operations for errors
Internal errorsAir bag operation
Front air bag system Side air bag system
X-axis acceleration sensor
error
DisabledDisabled
Y-axis acceleration sensor
errorDisabled
Z-axis acceleration sensor
erroravailable
ROM checksum error Disabled
RAM checksum error Disabled
NVM checksum error Disabled
Internal acceleration sensor test
The air bag unit checks internal acceleration sensor when the ignition is turned on. The air bag unit
determines the deployment of the air bag for the collision signal input after the diagnosis. -
Non-volatile memory (NVM) test
The air bag unit checks the values stored in the memory. If the values are not correct, the air bag unit
sets a diagnostic trouble code (DTC) and turns on the air bag warning lamp. -

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5) External monitoring
The air bag unit supplies a certain level of test current and monitors the resistance of the inflator circuit
within a specified range to deploy the air bag. It limits certain functions of the air bag, sets a DTC and
turns on the air bag warning lamp according to the conditions.
Inflator circuit resistance monitoring

Impact sensor monitoring
The air bag unit supplies a certain level of test current to monitor the front and side impact sensors. If the
wiring is open/short circuited or no signal is input, or communication is malfunctioning, it sets a DTC and
turns on the air bag warning lamp.
FaultsDetection
Time for clearing
Fault condition Time for detecting
Normal errorsIncorrect ID after IGN ON
Approx. 1 seconds.Approx. 2 seconds.
(next Ign) Faulty sensor after IGN ON
Communication error
Incorrect ID Inconsistent ID after IGN ON
Communication
errorCommunication data error
Approx. 2 seconds.
Open/Short circuit (B+)
Short Circuit to
GroundShort Circuit to Groundapprox. 2 to 4
seconds
6) DTC and Air Bag Deployment Data Storing
DTC storing
Airbag deployment data storing
The air bag deployment data due to a collision cannot be cleared. The air bag unit should be
replaced. -
- All DTCs of air bag system are stored in the air bag unit. Maximum number of DTCs that can be stored
is 16. If a new DTC is set after 16 DTCs are stored, the oldest stored code is erased first.
The air bag deployment data is stored in the air bat unit. Maximum number of data that can be stored is
7.

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Front impact
sensor mounting
Front end upper panel
Headlamp
aiming holeFront bumper bracket
Front bumper
bracket
Headlamp
bracket
Front bumper
- The appearance of the front bumper has been changed.
- The front end upper panel has been newly applied.
Front end upper member
The front bumper bracket has been newly applied.
Headlamp member
- Aiming hole has been added because of the changed
headlamp
- The install location of front impact sensor has been
changed.
- The appearances of the front bumper bracket and
headlamp bracket have been changed.

Rear quarter panel
The outline of the rear combination lamp mounting has been changed.