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1. Copyright by Hyundai Motor Company. All rights reserved.
SRS

2. 2SRS Air Bag
De-powered Airbag System (General/EUR)
Front Impact
Sensor(2)
FR Side Impact Sensor(2)
Driver A/BAG
Passenger Airbag
FRT Side
A/BAG(2)
Seat Belt
Pretensioner(2)
Curtain
A/BAG(2)
A/Bag Control Unit
DAB PAB PTSABCABWCS STPSBSSBR
Crash
Out
PAD
Lamp
PAD
S/W
FIS SIS
Gen 1 1 2 2 2 - - - - 1 - - 2 2
EUR 1 1 2 2 2 - - - - 1 1 1 2 2
PASSENGER AIIRBAG OFF

3. 3SRS Air Bag
Inputs and outputs
ACU
Driver airbag
Passenger airbag
Side airbags
Belt pretensioner
Airbag warning
lamp
Crash output to BCM
CAN communication with scanner
Battery (+)
Front impact sensor
Side impact sensor
Passenger airbag
Deactivation switch
ACU
Passenger airbag
deactivation lamp
Front impact sensor
Side impact sensor

4. 4SRS Air Bag
Airbag Thresholds
Driver Airbag
Unbuckled/Buckled
PT Airbag
Crash Severity
No Fire Crash No Fire No Fire
Must Fire Crash Fire Fire
Passenger
Airbag
Unbuckled/Buckled
PAB On-Off Switch On (Enabled) PAB On-Off Switch Off (Disabled)
PT Airbag PT Airbag
No Fire Crash No Fire No Fire No Fire No Fire
Must Fire Crash Fire Fire Fire No Fire
Driver Front Airbag
Passenger Front Airbag

5. 5SRS Air Bag
Airbag Thresholds
Driver Seat
Thorax and side airbag
PT Side airbag
Crash Severity
No Fire side crash No Fire No Fire
Must Fire side crash No Fire Fire
Passenger Seat PAB On-Off Switch On (Enabled)PAB On-Off Switch Off (Disabled)
Thorax and head side airbag PT Side airbag PT Side airbag
Crash
Severity
No Fire side crash No Fire No Fire No Fire No Fire
Must Fire side crash No Fire Fire No Fire Fire
Driver Side Airbag (DSAB)
Passenger Side Airbag (PSAB)

6. 6SRS Air Bag
ACU (Airbag Control Unit)
The primary functions
①Crash Detection
②Activation of the front airbags, Side airbags and belt pretensioners
③Monitoring of the airbag restrain system
④Indicate system readiness and faults to the drive by means of a fault warning lamp
⑤Facilitate servicing capability via a serial diagnostic communication interface

7. 7SRS Air Bag
DAB (Driver Air Bag)
Resistance: 2 0.3Ω
All-fire current: 1.2A for 3ms.
No-fire current: single pulse of 0.4A for 10 sec
Cyclic test current: 100mA for continuous

8. 8SRS Air Bag
PAB (Passenger Air Bag)
Resistance: 2 0.3Ω
All-fire current: 1.2A for 3ms.
No-fire current: single pulse of 0.4A for 10 sec
Cyclic test current: 100mA for continuous

9. 9SRS Air Bag
FSAB (Front Side Air Bag)
Resistance: 2 0.3Ω
All-fire current: 1.2A for 3ms.
No-fire current: single pulse of 0.4A for 10 sec
Cyclic test current: 100mA for continuous

10. 10SRS Air Bag
CAB (Curtain Air Bag)
Resistance: 2 0.3Ω
All-fire current: 1.2A for 3ms.
No-fire current: single pulse of 0.3A for 10 sec
Cyclic test current: 25mA for 400ms

11. 11SRS Air Bag
SPT (Seatbelt Pre Tensioner)
Resistance: 2 0.3Ω
All-fire current: 1.2A for 3ms.
No-fire current: single pulse of 0.4A for 10 sec
Cyclic test current: 100mA for continuous

12. 12SRS Air Bag
PAD (Passenger Airbag Deactivation) Switch –EUR Only
Pin No Description
1 Ignition 1
2 Earth-Glove Box
3 Ground – ACU I/F
4 ACU Interface Line

13. 13SRS Air Bag
FIS (Front Impact Sensor) & SIS (Side Impact Sensor)
Name HMC Number Sensor Figures
Side
Impact Sensor
95920-0X000
100g,
x-axis
Front
Impact Sensor
95920-1J100
250g,
x-axis

14. 14SRS Air Bag
Airbag (SRS) Warning Lamp Operations
(Active fault or historical fault counter is greater or equal to 10)
(Normal or historical fault counter is less than 10)

15. 15SRS Air Bag
PAD Indicator Operations
( PAD Lamp operation during Phase-up )

16. 16SRS Air Bag
Crash Output
The required command mode implementation is high/low voltage level.
When the fire decision is made by ACU, crash output stays low voltage during
200ms like below.
(Crash Output Signal)

17. 17SRS Air Bag
Crashing
Information
Diagnostic Trouble
Codes
Identification
Check
Front Crash Information
Side Crash InformationDriver Crash Information Passenger Crash Information
Passenger Airbag
Realtime Info
Internal faults can´t be erased
Diagnostic Tree

18. 18SRS Air Bag
Inspectionchartfor
troublesymptom
InspectionchartforDTC Intermittentmalfunction
NoDTCorcan’t
communicatewith
Hi-Scan
Reoccurs Doesnotreoccur
DTCdisplayed DTCdisplayedNoDTC
DTCdisplayed
NoDTC
Gatheringinformation
fromcustomer
Verifycomplaint
CheckDTC CheckDTC
RecordDTCthentryto
erasethem
Rechecktroublesymptom
CheckdisplayedDTC
System Checking Flow