Hyundai Accent: Restraint

General Information

- General Information The supplemental restraint system (SRS) is designed to supplement the seat belt to help reduce the risk or severity of injury to the driver and passenger by activating and deploying the driver, passenger, side airbag and belt pretensioner in certain frontal or side collisions.The SRS (Airbag) consists of ; a driver side airbag module located in the center of the steering wheel, which contains the folded cushion and an inflator unit ; a passenger side airbag module located in the passenger side crash pad contains the folded cushion assembled with inflator unit ; side airbag modules located in the front seat contain the folded cushion and an inflator unit ; curtain airbag modules located inside of the headliner which contains folded cushions and inflator units. The impact sensing function of the SRSCM is carried out by electronic accelerometer that continuously measure the vehicle’s acceleration and delivers a corresponding signal through amplifying and filtering circuitry to the microprocessor.SRSCM (SRS Control Module) SRSCM will detect front impact with front impact sensors and internal acceleration sensors inside of SRSCM. For side impact, SRSCM will detect the side impact with 2 side impact sensors,and internal acceleration sensor inside of SRSCM.SRSCM is designed to issue corresponding airbag module(s) deployment(s) using above described sensor inputs.

1.DC/ DC converter : DC/DC converter in power supply unit includes up/down transformer converter, and provides ignition voltage for all firing circuits, implemented as ASICs and the internal operation voltage of the SRSCM itself. if the internal operation voltage is below critical value setting, it will perform resetting.

2.Back up power supply : SRSCM has separate back up power supply, that will supply deployment energy instantly in low voltage condition or upon power failure by front crash.

3.Self diagnosis : SRSCM will constantly monitor current SRS operation status and detect system failure while vehicle power supply is on, system failure may be checked with trouble codes using GDS.

4.Airbag warning lamp on : Upon detecting error, the module will transmit signal to SRSCM indicator lamp located at cluster. MIL lamp will indicat to the driver that there is an SRS error. Upon ignition key on, SRS lamp will turn on for about six seconds.

5.Trouble code registration : Upon error occurrence in system, SRSCM will store DTC corresponding to the error. DTC can be cleared only by GDS. However, if an internal fault code is active or if a crash is recorded the fault clearing cannot be performed.

6.Self diagnostic connector : Data stored in SRSCM memory will be output to GDS or other external output devices through a connector located below driver side crash pad.

7.Once airbag is deployed, SRSCM should not be used again but replaced.

8.SRSCM will determine whether passenger fasten the seat belt by the signal from built-in switch in seat belt buckle, and deploy front seat airbag at each set crash speed.

9.Side airbag deployment will be determined by SRSCM that will detect satellite sensor impact signal upon side crash, irrespective to seat belt condition.

Specifications ➤

Special Service Tools

- Special Service Tools

Tool (Number and Name)	Illustration	Use
Deployment tool 0957A-34100A		Airbag deployment tool. Use with (0957A-AL140)
Dummy 0957A-38200		Simulator to check the resistanceof each wiring harness. Use with (0957A-AL170)
Airbag deployment & dummy adapter kit 0957A-AL100		Use with airbag deployment and airbag inspection
Deployment adapter 0957A-AL140		Use with deployment tool. (0957A-34100A) (DAB, PAB, BPT, CAB, APT)
Deployment adapter 0957A-AL150		Use with deployment tool. (0957A-34100A) (SAB)
Dummy adapter 0957A-AL170		Use with dummy (0957A-38200) (DAB, PAB, BPT, CAB, APT)
Dummy adapter 0957A-AL180		Use with dummy (0957A-38200) (SAB)

DAB : Driver AirbagPAB : Passenger AirbagBPT : Seat Belt PretensionerSAB : Side AirbagCAB : Curtain Airbag

General Safety Information and Caution ➤

Description and Operation

- Warning Lamp Activation Warning Lamp Behavior after Ignition On As soon as the operating voltage is applied to the SRSCM ignition input, the SRSCM activates the warning lamp for a LED lamp check.The lamp shall turn on for 6 seconds during the initialization phase and be turned off afterward. To alert the driver, the warning lamp shall turn on for 6 seconds and off for one second then on continuously after the operating voltage is applied if any active fault exists.

1.Active fault.

2.Normal or historical fault only exist.

3.When turning the ignition switch ON during variant coding (EOL) mode, the airbag warning lamp is turned on and blinks at intervals of 1 second till the coding is completed.If the variant coding is completed normally, the airbag warning lamp will turn on for 6 seconds, and then turned off. Otherwise the airbag warning lamp continuously blinks at intervals of 1 second.

(1)In case the variant coding is normally completed

(2)In case the variant coding is not completed

When there is active fault in airbag system or SRSCM internal fault, the variant coding (EOL) cannot be completed. In this case, perform the variant coding (EOL) procedure again after troubleshooting with the GDS.

SRSCM Independent Warning Lamp Activation There are certain fault conditions in which the SRSCM cannot function and thus cannot control the operation of the standard warning lamp. In these cases, the standard warning lamp is directly activated by appropriate circuitry that operates independently of the SRSCM. These cases are:

1.Loss of battery supply to the SRSCM : warning lamp turned on continuously.

2.Loss of internal operating voltage : warning lamp turned on continuously.

3.Loss of Microprocessor operation : warning lamp turned on continuously.

4.SRSCM not connected : warning lamp turned on continuously.

Repair procedures

- Component Replacement After Deployment

   

• Before doing any SRS repairs, use the GDS Pro to check for DTCs. Refer to the Diagnostic Trouble Code list for repairing of the related DTCs.

When the front airbag(s) deployed after a collision, replace the following items.

– SRSCM

– Deployed airbag(s)

– Seat belt pretensioner(s)

– Front impact sensors

– SRS wiring harnesses

– Inspect the clock spring for heat damage.If any damage found, replace the clock spring.

When the side/curtain airbag(s) deployed after a collision, replace the following items.

– SRSCM

– Deployed airbag(s)

– Side impact sensor(s) for the deployed side(s)

– SRS wiring harnesses

– Seat belt pretensioner(s)

After the vehicle is completely repaired, confirm the SRS airbag system is OK.

– Turn the ignition switch ON; the SRS indicator should come on for about six seconds and then go off.

SRSCM ➤

Airbag Module ➤

Seat Belt Pretensioner ➤