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 4 side impact sensors, 2 conventional acceleration sensors in Center pillar inner locations and 2 pressure sensing sensors in side of front door module, 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

Specification

Item	Resistance (?)
Driver Airbag (DAB)	1.7 ~ 6.0
Passenger Airbag (PAB)	1.7 ~ 6.0
Knee Airbag (KAB)	1.7 ~ 6.0
Side Airbag (SAB)	1.8 ~ 6.0
Curtain Airbag (CAB)	1.7 ~ 6.0
Seat Belt Pretensioner (BPT)	1.7 ~ 6.0
Emergency Fastening Device (EFD)	1.7 ~ 6.0

Tightening Torques

Item	N.m	kgf.m	lb-ft
Passenger Air Bag	3.9 ~ 5.9	0.4 ~ 0.6	2.9 ~ 4.3
Curtain Air Bag	7.8 ~ 11.8	0.8 ~ 1.2	5.8 ~ 8.7
Side Air Bag	5.9 ~ 7.8	0.6 ~ 0.8	4.3 ~ 5.8
Knee Airbag (KAB)	7.8 ~ 11.8	0.8 ~ 1.2	5.8 ~ 8.7
Seat Belt Retractor Pretensioner	39.2 ~ 53.9	4.0 ~ 5.5	28.9 ~ 39.8
Emergency Fastening Device	39.2 ~ 53.9	4.0 ~ 5.5	28.9 ~ 39.8
Supplemental Restraint System Control Module	7.8 ~ 9.8	0.8 ~ 1.0	5.8 ~ 7.2
Front Impact Sensor	7.8 ~ 9.8	0.8 ~ 1.0	5.8 ~ 7.2
Pressure Side Impact Sensor	2.0 ~ 2.9	0.2 ~ 0.3	1.4 ~ 2.2
Gravity Side Impact Sensor	7.8 ~ 9.8	0.8 ~ 1.0	5.8 ~ 7.2

Special Service Tools

Special Service Tools

Tool (Number and Name)	Illustration	Use
Deployment tool 0957A-34100A		Airbag deployment tool. Use with (0957A-AL140, 0957A-AL150, 0957A-AL160)
Dummy 0957A-38200		Simulator to check the resistanceof each wiring harness. Use with (0957A-AL170, 0957A-AL180, 0957A-AL190)
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, CAB, BPT, EFD)
Deployment adapter 0957A-AL150		Use with deployment tool. (0957A-34100A) (KAB)
Deployment adapter 0957A-AL160		Use with deployment tool. (0957A-34100A) (SAB)
Dummy adapter 0957A-AL170		Use with dummy (0957A-38200) (DAB, PAB, CAB, BPT, EFD)
Dummy adapter 0957A-AL180		Use with dummy (0957A-38200) (KAB)
Dummy adapter 0957A-AL190		Use with dummy (0957A-38200) (SAB)

DAB : Driver Airbag

PAB : Passenger Airbag

SAB : Side Airbag

CAB : Curtain Airbag

KAB : Knee Air Bag

BPT : Seat Belt Pretensioner

EFD : Emergensy Fastening Devise

General Safety Information and Caution

Precautions

General Precautions

Please read the following precautions carefully before performing the airbag system service.

Observe the instructions described in this manual, or the airbags could accidentally deploy and cause damage or injuries.

•	Except when performing electrical inspections, always turn the ignition switch OFF and disconnect the negative cable from the battery, and wait at least three minutes before beginning work.

The contents in the memory are not erased even if the ignition switch is turned OFF or the battery cables are disconnected from the battery.

•	Use the replacement parts which are manufactured to the same standards as the original parts and quality. Do not install used SRS parts from another vehicle. Use only new parts when making SRS repairs.

•	Carefully inspect any SRS part before you install it. Do not install any part that shows signs of being dropped or improperly handled, such as dents, cracks or deformation.

•	Before removing any of the SRSCM parts (including the disconnection of the connectors), always disconnect the SRSCM connector.

Airbag Handling and Storage

Do not disassemble the airbags; it has no serviceable parts. Once an airbag has been deployed, it cannot be repaired or reused.

For temporary storage of the air bag during service, please observe the following precautions.

•	Store the removed airbag with the pad surface up.

•	Keep free from any oil, grease, detergent, or water to prevent damage to the airbag assembly.

•	Store the removed airbag on secure, flat surface away from any high heat source (exceeding 85 C/185 F).

•	Never perform electrical inspections to the airbags, such as measuring resistance.

•	Do not position yourself in front of the airbag assembly during removal, inspection, or replacement.

•	Refer to the scrapping procedures for disposal of the damaged airbag.

•	Be careful not to bump or impact the SRS unit or the side impact sensors or front impact sensors whenever the ignition switch is ON, wait at least three minutes after the ignition switch is turned OFF before begin work.

•	During installation or replacement, be careful not to bump (by impact wrench, hammer, etc.) the area around the SRS unit and the side impact sensor and the front impact sensors. The airbags could accidentally deploy and cause damage or injury.

•	Replace the front airbag module, SRSCM, FIS when the front airbag is deployed. Replace the airbag wiring when the airbag wiring get damaged. Replace the side airbag module, the curtain airbag module, SRSCM, SIS when deploying the side airbag. Replace the airbag when the airbag wiring get damaged.

•	After a collision in which the airbags or the side air bags did not deploy, inspect for any damage or any deformation on the SRS unit and the side impact sensors. If there is any damage, replace the SRS unit, the front impact sensor and/or the side impact sensors.

•	Do not disassemble the SRS unit, the front impact sensor or the side impact sensors.

•	Turn the ignition switch OFF, disconnect the battery negative cable and wait at least three minutes before beginning installation or replacement of the SRS unit.

•	Be sure the SRS unit, the front impact sensor and side impact sensors are installed securely with the mounting bolts.

•	Do not spill water or oil on the SRS unit, or the front impact sensor or the side impact sensors and keep them away from dust.

•	Store the SRS unit, the front impact sensor and the side impact sensors in a cool (15 ~ 25 C/ 59 ~ 77 F) and dry (30 ~ 80% relative humidity, no moisture) area.

Wiring Precautions

SRS wiring can be identified by special yellow outer covering Observe the instructions described in this section.

•	Never attempt to modify, splice, or repair SRS wiring. If there is an open or damage in SRS wiring, replace the harness.

•	Be sure to install the harness wires so that they are not pinched, or interfere with other parts.

•	Make sure all SRS ground locations are clean, and grounds are securely fastened for optimum metal-to-metal contact. Poor grounding can cause intermittent problems that are difficult to diagnose.

Precautions for Electrical Inspections

•	When using electrical test equipment, insert the probe of the tester into the wire side of the connector. Do not insert the probe of the tester into the terminal side of the connector, and do not tamper with the connector.

•	Use a u-shaped probe. Do not insert the probe forcibly.

•	Use specified service connectors for troubleshooting. Using improper tools could cause an error in inspection due to poor metal contact.

Spring-loaded Lock Connector

Some SRS system connectors have a spring-loaded lock.

Airbag Connector

Disconnecting

To release the lock, pull the spring-loaded sleeve (A) and the slider (B), while holding the opposite half of the connector.

Pull the connector halves apart. Be sure to pull on the sleeve and not on the connector half.

Connecting

Hold both connector halves and press firmly until the projection (C) of the sleeve-side connector clicks to lock.

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.

Telltale Lamp Activation

The Telltale Lamp indicates the Passenger Airbag(PAB) enabled and disabled status based on occupant status of passenger seat. If the passenger seat is empty or occupied with child (or child seat), the Passenger Airbag is disabled and the Telltale Lamp is turned ON to inform the driver that the PAB is disabled. As soon as operating voltage is applied to the SRSCM ignition input, the SRSCM activates telltale lamp prove out. OCS (Occupant Classification System) will send an indeterminate status to the SRSCM as a default setting for passenger airbag deployment during the prove out period.

After ignition on, telltale lamp will turn on for 4 seconds and turn off for 3 seconds during the initialization phase and be turned NO afterward until receipt of valid enabled message from OCS (Occupant Classification System).

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)

-	Emergency fastening device(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)

-	Emergency fastening device(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.