Kia Optima: SRSCM / SRS Control Module (SRSCM)

Kia Optima DL3 2019-2020 Service and Repair 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 Location

1. Supplemental Restraint System Control Module (SRSCM)


Schematic diagrams
Supplemental Restraint System Control Module (SRSCM)

No
Connector A
Connector B
1
Driver airbag #1 (High)
-
2
Driver airbag #2 (Low)
-
3
Passenger airbag #2 (Low)
-
4
Passenger airbag #2 (High)
Driver rear side airbag ( Low)
5
-
Driver rear side airbag (High)
6
-
Passenger rear side airbag ( High)
7
-
Passenger rear side airbag ( Low)
8
-
-
9
-
-
10
B+
-
11
Crash output
-
12
Passenger airbag #1 (Low)
-
13
Passenger airbag #1 (High)
-
14
Driver knee airbag (High)
-
15
Driver knee airbag (Low)
Passenger seat belt buckle sensor (High)
16
Passenger airbag OFF Lamp (Telltale)
Driver seat belt buckle sensor (High)
17
-
Passenger curtain airbag (Low)
18
-
Passenger curtain airbag (High)
19
Driver airbag #1 (High)
Driver curtain airbag (High)
20
Driver airbag #1 (Low)
Driver curtain airbag (Low)
21
-
Passenger side airbag (Low)
22
-
Passenger side airbag (High)
23
-
Driver side airbag (High)
24
-
Driver side airbag (Low)
25
-
-
26
C-CAN (Low)
-
27
C-CAN (High)
Driver seat belt pretensioner (Low)
28
IGN 1
Driver seat belt pretensioner (High)
29
Driver front impact sensor (High)
-
30
Driver front impact sensor (Low)
-
31
Passenger front impact sensor (Low)
-
32
Passenger front impact sensor (High)
Passenger seat belt pretensioner (High)
33
-
Passenger seat belt pretensioner (Low)
34
-
-
35
P-CAN (Low)
-
36
P-CAN (High))
-
37

-
38
-
39
-
40
Ground
41
-
42
-
43
Driver pressure side impact sensor (High)
44
Driver pressure side impact sensor (Low)
45
Passenger pressure side impact sensor (Low)
46
Passenger pressure side impact sensor (High)
47
Driver gravity side impact sensor (High)
48
Driver gravity side impact sensor (Low)
49
Passenger gravity side impact sensor (Low)
50
Passenger gravity side impact sensor (High)
51
-
52
-

Repair procedures
Removal
1.

Disconnect the battery negative terminal.

  

After disconnecting the cables, wait at least 3 minutes.

2.

Remove the floor console assembly.

(Refer to Body - "Floor Console Assembly")

3.

Disconnect the SRSCM connectors (A).

4.

Remove the SRSCM (A) by loosening the bolt and nuts.

Tightening torque :

Bolt : 10.8 - 13.7 N·m (1.1 - 1.4 kgf·m, 8.0 - 10.1 lbf·ft)

Nut : 6.9 - 11.8 N·m (0.7 - 0.8 kgf·m, 5.0 - 5.8 lb·ft, 60.8 - 69.4 lb·in)

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 KDS server after inputting the VIN to the KDS 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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