Kia Rio: SRSCM / SRS Control Module (SRSCM)

Description and operation

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 stabilize.

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 at key-on. The system must perform a continuous diagnostic routine and provide fault annunciation 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

Repair procedures

5.	Loosen the bolt (A) and nuts (B) and then remove the Supplemental Restraint System Control Module (SRSCM). You must remove or install SRSCM or other SRS components with the ignition switch OFF to avoid accidental airbag deployment.

After replacing the SRSCM, the “Variant Coding” must be performed.

1) On SRSCM variant coding mode, the airbag warning lamp is periodically blinking (ON: 0.5sec., OFF: 0.5sec.) until the coding is normally completed. 2) If the variant coding is failed, DTC B1762 (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 B1683 (Exceed Maximum coding Number) will be displayed and SRSCM must be replaced. 3) If the battery voltage is low (less than 9V), DTC B1102 will be displayed. In this case, charge the battery before anything else, and then perform the variant coding procedure. DTC B1762 (ACU Coding Error) and B1102 (Battery Voltage Low) may be displayed simultaneously.

Variant coding Procedure

1) Initial ACU Variant Coding screen

2) VIN Code entering screen

3) Variant coding's proceeding screen-1

4) Variant coding's proceeding screen-2

5) Variant coding is completed

1) This screen is opened when you try the variant coding again on the SRSCM which has bee performed variant coding. 2) Screen of communication failure

■ Off-line type on KDS/GDS (This can be used when not connecting to internet)

1) Initial ACU Variant Coding screen

2) ACU Coding Code entering screen

3) Screen of rechecking ACU Coding code's entering

4) Variant coding's proceeding screen-1

5) Variant coding's proceeding screen-2

6) Variant coding is completed

1) This screen is opened when you try the variant coding again on the SRSCM which has been performed variant coding.