Kia Forte: SRSCM / SRS Control Module (SRSCM)

Kia Forte 2019-2020 (BD) Service Manual / Restraint / SRSCM / SRS Control Module (SRSCM)

Description and operation
Description

The primary purpose of the SRSCM (Supplemental Restraints System Control Module) is to discriminate between an event that warrants restraint system deployment and an event that does not. The SRSCM must decide whether to deploy the restraint system or not. After determining that pretensioners and/or airbag deployment is required, the SRSCM must supply sufficient power to the pretensioners and airbag igniters to initiate deployment.

The SRSCM determines that an impact may require deployment of the pretensioners and airbags from data obtained from impact sensors and other components in conjunction with a safing function.

The SRSCM will not be ready to detect a crash or to activate the restraint system devices until the signals in the SRSCM circuitry is stabilized.

It is possible that the SRSCM could activate the safety restraint devices in approximately 2 seconds but is guaranteed to fully function after prove-out is completed.

The SRSCM must perform a diagnostic routine and light a system readiness indicator when the ignition switch is in the ON position. The system must perform a continuous diagnostic routine and provide fault notice through a warning lamp indicator in the event of fault detection. A serial diagnostic communication interface will be used to facilitate servicing of the restraint control system.

Components and components location
Components

1. Supplemental Restraint System Control Module (SRSCM)


Repair procedures
Removal
1.

Disconnect the negative battery terminal .

  

After disconnecting the cables, wait at least 30 seconds.

2.

Remove the floor console.

(Refer to Body - "Floor Console Assembly")

3.

Remove the rear air vent duct (A) after loosening the nut.

4.

Disconnect the Supplemental Restraint System Control Module (SRSCM) connector (A).

5.

Loosen the nuts and then remove the Supplemental Restraint System Control Module (A).

Tightening torque :

6.96 - 7.25 N·m (0.71 - 0.74 kgf·m, 5.13 - 5.35 lb·ft)

  

Switch "OFF" the ignition when removing or installing SRSCM or other SRS components to avoid accidental airbag deployment.

  

Be careful not to damage the SRSCM connector.

Installation
1.

Install in the reverse of the removal.

2.

After installing the SRSCM, confirm proper system operation:

Switch ON the ignition. The SRS indicator light should turn on for about six seconds and then off.

Variant coding

After replacing the SRSCM with a new one, the "Variant Coding" procedure MUST be performed.

  
1)

In SRSCM variant coding mode, the airbag warning lamp periodically flickers (ON: 0.5sec., OFF: 0.5sec.) until the coding is normally completed.

2)

If the variant coding has failed, DTC (ACU Coding Error) will be displayed and the warning lamp will be turned on.

In this case, perform the variant coding procedure again after confirming the cause in “DTC Fault State Information”.

Variant Coding can be performed up to 255 times, but if the number of coding work exceeds 255 times, DTC (Exceed Maximum coding Number) will be displayed and SRSCM must be replaced.

3)

If the battery voltage is low (less than 9V), DTC will be displayed. In this case, charge the battery before anything else, and then perform the variant coding procedure.

DTC (ACU Coding Error) and (Battery Voltage Low) may be displayed simultaneously.

Variant coding Procedure

■ On-Line on KDS
1.

Switch "OFF" ignition, and connect KDS.

2.

With ignition "ON" & Engine "OFF", select vehicle name and airbag system.

3.

Select Variant coding mode.

4.

Enter the VIN code.

■ Off-Line on KDS
1.

Confirm the ACU variant coding code from the GSW server after inputting the VIN to the GSW sever.

2.

Switch "OFF" ignition, and connect KDS.

3.

With ignition "ON" & Engine "OFF", select vehicle name and airbag system.

4.

Select Variant coding mode.

5.

Input the ACU coding code.

SRSCM
...

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