Hyundai Santa Fe (TM): SRSCM

Hyundai Santa Fe TM 2019-2023 Service Manual / Restraint / SRSCM

Components and components location

Components

1. Supplemental Restraint System Control Module (SRSCM)
2. Gravity side impact sensor (G-SIS) _ C pillar
3. Gravity side impact sensor (G-SIS) _ B pillar

4. Front impact sensor (FIS) [RH]
5. Front impact sensor (FIS) [LH]
6. Pressure side impact sensor (P-SIS)

Schematic diagrams

Circuit Diagram

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.

SRS Control Module (SRSCM). Components and components location

Components

1. Supplemental Restraint System Control Module (SRSCM)

SRS Control Module (SRSCM). Schematic diagrams

Supplemental Restraint System Control Module (SRSCM)

No	Connector A	Connector B
1	Driver airbag 2st stage (High)	-
2	Driver airbag 2st stage (Low)	-
3	Passenger airbag 2st stage (Low)	-
4	Passenger airbag 2st stage (High)	Driver seat belt anchor pretensioner (Low)
5	-	Driver seat belt anchor pretensioner (High)
6	-	Passenger seat belt anchor pretensioner (High)
7	Passenger airbag active air vent (Low)	Passenger seat belt anchor pretensioner (Low)
8	Passenger airbag active air vent (High)
9	-
10	B+
11	Crash output
12	Passenger airbag 1st stage (Low)
13	Passenger airbag 1st stage (High)	-
14	-	-
15	-	Passenger seat belt buckle sensor
16	Telltale lamp	-
17		Passenger curtain airbag (Low)
18	-	Passenger curtain airbag (High)
19	Driver airbag 1st stage - (High)	Driver curtain airbag (High)
20	Driver airbag 1st stage (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	Front impact sensor LH - (High)	-
30	Front impact sensor LH - (Low)	-
31	Front impact sensor RH - (Low)	-
32	Front impact sensor RH - (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		Driver side rear impact sensor (Low)
42		Driver side rear impact sensor (High)
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 side impact sensor (High)
48		Driver side impact sensor (Low)
49		Passenger side impact sensor (Low)
50		Passenger side impact sensor (High)
51		Passenger side rear impact sensor (High)
52		Passenger side rear impact sensor (Low)

SRS Control Module (SRSCM). Repair procedures

Removal

1.	Turn the engine OFF.

2.	Disconnect the battery negative cable and wait for at least three minutes before beginning work.

3.	Remove the floor console assembly. (Refer to Body - "Floor Console Assembly")

4.	Loosen the mounting bolts and then remove the air duct.

5.	Pull up the lock of the SRSCM connector to disconnect the connector.

Remove the SRSCM mounting bolts and then remove the SRSCM.

•	You must remove or install the SRSCM or other SRS components with the ignition switch OFF to avoid accidental airbag deployment.

Installation

1.	Turn the engine OFF.

2.	Disconnect the battery negative cable and wait for at least three minutes before beginning work.

Install the SRSCM with the SRSCM mounting bolts (3EA).

Tightening torque :

10.8 - 12.7 N.m (1.0 - 1.3 kgf.m, 7.2 - 9.4 lb-ft)

4.	Connect the SRSCM harness connector.

5.	Install the rear air duct.

6.	Install the floor console assembly. (Refer to Body - "Floor Console Assembly")

7.	Reconnect the battery negative cable.

After installing the SRSCM, confirm proper system operation :

Turn the ignition switch ON; the SRS indicator light should be turned on for about six seconds and then go off.

•	If the SRSCM is replaced always, perform variant coding. Also, perform the lateral G sensor 0 point setup. (Refer to Brake System - "Yaw-rate and Lateral G Sensor")

Variant Coding

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

Variant Coding Procedure

1.	Connect the cable of GDS to the data link connector in driver side crash pad lower panel, and turn on the GDS.

2.	Select the 'S/W Management' and 'Car model'.

3.	Select "Airbag" and "ACU/SRSCM Variant Coding".

4.	Perform the "ACU/SRSCM Variant Coding" procedure according to the GDS screen message.

Front Impact Sensor (FIS). Description and operation

Description

The front impact sensor (FIS) is installed in the Front End Module (FEM). They are remote sensors that detect acceleration due to a collision at its mounting location. The primary purpose of the Front Impact Sensor (FIS) is to provide an indication of a collision. The Front Impact Sensor (FIS) sends acceleration data to the SRSCM.

Front Impact Sensor (FIS). Components and components location

Components

1. Front impact sensor (FIS) [RH]

2. Front impact sensor (FIS) [LH]

Front Impact Sensor (FIS). Repair procedures

Removal

•	Do not turn the ignition switch ON and do not connect the battery cable while replacing the front impact sensor.

1.	Disconnect the battery negative cable, and wait for at least three minutes before beginning work.

2.	Disconnect the front impact sensor connector (A) and then remove the front impact sensor (B) after loosening the mounting bolt.

Installation

•	Do not turn the ignition switch ON and do not connect the battery cable while replacing the front impact sensor.

1.	Install a new front impact sensor.

Tighten the front impact sensor mounting nut.

Tightening torque :

7.8 - 10.8 N.m (0.8 - 1.0 kgf.m, 5.7 - 7.2 lb-ft)

3.	Connect the front impact sensor connector.

4.	Install the radiator assembly.

5.	Reconnect the battery negative cable.

6.	After installing the front impact sensor, confirm proper system operation : Turn the ignition switch ON; the SRS indicator light should turn on for about six seconds and then go off.

Side Impact Sensor (SIS). Description and operation

Description

The Side Impact Sensor (SIS) system consists of two kinds of side impact sensor which are installed at each center of the front door module (left and right) and two rear sensors which are installed in the rear pillar (left and right).

•	The Front Side Impact Sensor is also called P-SIS because it detects pressure due to collision at its mounting location.

•	The Rear Side Impact Sensor is also called A-SIS because it detects acceleration due to collision at its mounting location.

SRSCM decides deployment of the airbag and the time of deployment through the collision signal of the SIS when collision occurrs.

Side Impact Sensor (SIS). Components and components location

Components

1. Gravity Side Impact Sensor [G-SIS(B-Pillar)]
2. Gravity Side Impact Sensor [G-SIS(C-Pillar)]

3. Front Pressure Side Impact Sensor (P-SIS)

Side Impact Sensor (SIS). Repair procedures

Removal

•	Removal of the airbag must be performed according to the precautions/procedures described previously.

•	Do not turn the ignition switch ON and do not connect the battery cable while replacing the side impact sensor.

Pressure Side Impact Sensor [P-SIS(Door)]

1.	Disconnect the battery negative cable, and wait for at least three minutes before beginning work.

2.	Remove the front door trim. (Refer to Body - "Front Door Trim")

3.	Disconnect the front side impact sensor connector (A).

4.	Remove the front side impact sensor (A) by loosening the screw.

Gravity Side Impact Sensor [G-SIS(B Pillar)]

1.	Disconnect the negative battery terminal, and wait for at least thirty seconds before beginning to work.

2.	Remove the center pillar trim. (Refer to Body - "Center Pillar Trim")

3.	Disconnect the connector (B) and then remove the side impact sensor (A) after loosening the mounting bolt.

Gravity Side Impact Sensor [G-SIS(C-Pillar)]

1.	Disconnect the battery negative cable and wait for at least three minutes before beginning work.

2.	Remove the luggage side trim. (Refer to Body - "Luggage Side Trim")

3.	Disconnect the connector (B) and then remove the side impact sensor (A) after loosening the mounting bolt.

Installation

•	Do not turn the ignition switch ON and do not connect the battery cable while replacing the side impact sensor.

Pressure Side Impact Sensor [P-SIS (Door)]

Install the new front side impact sensor with the screws, then connect the front side impact sensor connector.

Tightening torque :

7.8 - 10.8 N.m (0.8 - 1.0 kgf.m, 5.7 - 7.2 lb-ft)

•	Use specified bolts only.

2.	Install the front door trim. (Refer to Body - "Front Door Trim")

3.	Reconnect the battery negative cable.

4.	After installing the front side impact sensor, confirm proper system operation: Turn the ignition switch ON; the SRS indicator light should turn on for about six seconds and then go off.

Gravity Side Impact Sensor [G-SIS (C-Pillar)]

Install the new rear side impact sensor with a bolt and then connect the rear side impact sensor connector.

Tightening torque :

7.8 - 10.8 N.m (0.8 - 1.0 kgf.m, 5.7 - 7.2 lb-ft)

2.	Install the luggage side trim. (Refer to Body - "Luggage Side Trim")

3.	Reconnect the battery negative cable.

4.	After installing the rear side impact sensor, confirm proper system operation: Turn the ignition switch ON; the SRS indicator light should turn on for about six seconds and then go off.

Gravity Side Impact Sensor [G-SIS(B-Pillar)]

•	Do not turn the ignition switch ON and do not connect the battery cable while replacing the side impact sensor.

Install the side impact sensor with the bolt then connect the side impact sensor connector.

Tightening torque :

7.8 - 10.8 N.m (0.8 - 1.0 kgf.m, 5.7 - 7.2 lb-ft)

2.	Install the luggage side trim. (Refer to Body - "Luggage Side Trim")

3.	Reconnect the battery negative cable.

After installing the pressure side impact sensor, confirm proper system operation:

•	Turn the ignition switch ON; the SRS indicator light should be turned on for about six seconds and then go off.

•	You must comply with the specified tightening torques with the tool specified because Gravity – Side Impact Sensors (G-SIS) may be broken or POP-NUT may be rotated.

•	Problems may be occurred in the durability of G-SIS or impact sensing performance may be depreciated if POP-NUT is rotated.

•	The door module must not be transformed because SRSCM judges a impact through the pressure sensor in the door module.

Seat Belt Buckle Switch (BS). Description and operation

Description

The SRSCM monitors the status of the driver and front passenger seat belt buckle. The SRSCM provides one pin each for the driver and front passenger seat belt buckle status input. The seat belt buckle circuit operates from internal boost voltage supplied by the SRSCM, and uses chassis ground for the signal return. The buckle status modify the SRSCM deployment. If the buckle status is unbuckled, the corresponding pretensioner will not be deactivated.

Seat Belt Buckle Switch (BS). Components and components location

Components

1. Seat belt buckle switch (BS)

Seat Belt Buckle Switch (BS). Repair procedures

Removal

1.	Disconnect the battery negative cable, and wait for at least three minutes before beginning work.

2.	Remove the front seat assembly. (Refer to Body - "Front Seat Assembly")

3.	Remove the seat belt buckle switch wiring (A).

4.	Remove the seat belt buckle switch by loosening the monuting bolt.

Installation

•	Be sure to install the harness wires so they will not pinch or interfere with other parts.

1.	Install the seat belt buckle switch.

2.	Install the front seat assembly. (Refer to Body - "Front Seat Assembly")

3.	Reconnect the battery negative cable.

4.	After installing the seat belt buckle switch, confirm proper system operation: Turn the ignition switch ON; the SRS indicator should turn on for about six seconds and then go off.

Repair procedures

Component Replacement after Deployment • Before doing any SRS repairs, use the GDS to check for DTCs. Refer to the Diagnostic Trouble Code list for repairing of the related DTCs. When the ...

Airbag Module

Driver Airbag (DAB) Module and Clock Spring. Description and operation Description The Driver Airbag (DAB) is installed in the steering wheel and electrically connected to SRSCM via the clock spring. It ...