SsangYong Korando III (2010 year). Service manual — part 258

02-14

2) Air Bag Deployment Signal Output (Crash Out)

When a situation which requires air bag deployment occurs, they system outputs the air bag deployment

signal (crash out). If another air bag-required situation occurs while the deployment signal is sent, the

second crash out will be delayed until the current 200 ms crash out is completed. (The tolerance at the
time of signaling is ±5%)

The signal repeats increasing for 390 msec. and decreasing for 10 msec. before crash. At the time of

crash, the switch is closed and the signal is kept low condition for 200 msec.

At the time of crash, the crash out signal is changed to the low condition for 200 ms immediately to

indicate the crash moment.

02-15

8810-00

Collision signal interface

▶

The open collector driver raises or lowers the voltage of the pin no. 58 by switching on and off the drive

transistor. The vehicle module can be operated normally only by the logic of open collector interface

and can be maintained in a pull-up state. The followings are the specifications of the electrical interface.

The load resistance of the SDM is 590 ohms or higher. It may not be possible to operate the collision

occurrence circuit normally if the resistance value is not as specified.

Pin No.

Minimum

Average

Maximum

Remark

Driving current (current value
when the transistor is turned
on)

12.31 mA

19.6 mA

30 mA

Depending on the

battery voltage

Leakage current (current value
when the transistor is turned
off)

147.6 μA

376 μA

No crash signal

Load resistance

590 ohms

Above than this value

02-16

3) CAN Communication Interface (FIS and SIS)

The CAN communication interface uses the PWM for the supply current and the current loop and

communicates with the SDM to transmit the information. The serial communication and power for the

satellite are supplied through the communication line.

Stage

FIS

SIS

Initial stage

Tracking/Check (Self test)

Same as FIS

Normal operation Checks the FIS condition and sends the result as

"OK" or "NOK", and also sends the "severity" of the
crash.

Same as FIS

Voltage

The FIS hardware reset was performed under 5 V,
communication voltage low

Same as FIS

Fault

The fault is found in the current ignition cycle but the
fault is deactivated in the next ignition cycle.

Multiple faults can be found

and deactivated in the same

ignition cycle.

The FIS moves to the initial stage if 'leakage to GND' is occurred in normal operating stage to shut down

the power and prevent abnormal operation.
※ FIS: Front Impact Sensor

SIS: Side Air bag Sensor

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8810-00

4. AIR BAG WARNING LAMP OPERATIONAL CONDITIONS

When there are no active and past faults

▶

The air bag warning lamp is operated as shown below if there is no fault occurred in the previous ignition

cycle and the SDM is running without any active fault right after starting the ignition cycle.

When there is no active fault and past faults occurred less than 10 times

▶

The warning lamp is operated as shown below every time the vehicle is started if the SDM is running

without any active fault in the entire time and past faults in the previous ignition cycle occurred within 10

times.

"Battery voltage too low" is not included in the past faults.