Hyundai Tucson: 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 aimed 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.
- Active fault.
- Normal or historical fault only exist.
- 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
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 self-diagnosis device.
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:
- Loss of battery supply to the SRSCM : warning lamp turned on continuously.
- Loss of internal operating voltage : warning lamp turned on continuously.
- Loss of Microprocessor operation : warning lamp turned on continuously.
- SRSCM not connected : warning lamp turned on continuously.
Special Service Tools
Tool (Number and Name)/ Illustration/ Use
Deployment tool 0957A-34100A/ / Airbag deployment tool.
Use with (0957A-AL140, 0957A-AL160)
Dummy 095 7A-3 8200/ / Simulator to check the resistanceof each wiring harness.
Use with (095 7A-AL170, 0957A-AL190)
Airbag deployment & dummy adapter kit 0957A-AL100/ / Use with airbag deployment and airbag inspection.
Deployment adapter 0957A-AL120/ / Use with deployment tool.
(0957A-34100A) (SAB, CSAB)
Deployment adapter 0957A-AL140/ / Use with deployment tool.
(0957A-34100A) (DAB, PAB, CAB. BPT)
Dummy adapter 0957A-AL170/ / Use with dummy.
PAB, CAB. CSAB. SAB.
DAB : Driver Airbag
PAB : Passenger Airbag
SAB : Side Airbag
CAB : Curtain Airbag
BPT : Seat Belt Pretensioner
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 o f ; 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.
- 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.
- 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.
- 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 self-diagnosis.
- 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.
- Trouble code registration : Upon error occurrence in system, SRSCM will store DTC corresponding to the error. DTC can be cleared only by self-diagnosis. However, if an internal fault code is active or if a crash is recorded the fault clearing cannot be performed.
- Self diagnostic connector : Data stored in SRSCM memory will be output to self-diagnosis or other external output devices through a connector located below driver side crash pad.
- Once airbag is deployed, SRSCM should not be used again but replaced.
- 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.
- Side airbag deployment will be determined by SRSCM that will detect satellite sensor impact signal upon side crash, irrespective to seat belt condition.
- Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Owner's Manual
- Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual