2013 SSANGYONG KORANDO Service Manual

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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5. EVENT DATA RECORDER (EDR)
The event data recorder (EDR) stores the driving information data in a crash or near crash event, when
the acceleration sensor in the air bag unit detects a sharp acceleration change which meets the EDR
operating conditions, regardless of the air bag deployment The air bag unit always stores the driving
information data and updates the data with new one periodically. If a collision is detected by front and
side impact sensors, the acceleration sensor in the SDM detects the change in acceleration. The air bag
unit stores the information on internal acceleration sensor, driving status and air bag deployment at this
time.
The EDR stores the driving information also when the acceleration sensor in the air bag unit detects
a sharp acceleration change in the event of a rear-end collision or side collision for a vehicle without
an air bag

6. CIRCUIT DIAGRAM

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1. SPECIFICATION
1) Specifications