RM38T0EC _58 Vehicle Interior _115188 SUPPLEMENTAL RESTRAINT SYSTEMS _0511913 AIRBAG SYSTEM J

SUPPLEMENTAL RESTRAINT SYSTEMS AIRBAG SYSTEM SRS Warning Light Remains ON

DESCRIPTION

The SRS warning light is located in the combination meter assembly.

When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition switch is turned from off to ON, and then turns off automatically.

If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.

If a malfunction occurs in the airbag ECU assembly, combination meter assembly or wire harness connected to the airbag ECU assembly or combination meter assembly, the SRS warning light comes on.

The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag ECU assembly in case the power source voltage drops.

When the auxiliary battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the voltage of the SRS to normal voltage. In addition, when the voltage drops, the SRS warning light will illuminate.

The SRS warning light automatically turns off when the power source voltage returns to normal.

The signal to illuminate the SRS warning light is transmitted from the airbag ECU assembly to the combination meter assembly via CAN communication.

WIRING DIAGRAM

4.688,0.813 5.531,1.146 0.844,0.333 10 false A/BAG-IGR 3.604,3.01 3.99,3.302 0.385,0.292 10 false ES 3.375,1.729 3.604,1.979 0.229,0.25 10 false 6 3.396,2.906 3.573,3.219 0.177,0.313 10 false 2 6.021,0.615 6.438,0.938 0.417,0.323 10 false IGR 6.021,2.542 6.438,2.844 0.417,0.302 10 false E1 6.021,3.031 6.438,3.323 0.417,0.292 10 false E2 5.99,3.625 6.656,3.823 0.667,0.198 10 false I47 3.354,3.542 3.938,3.75 0.583,0.208 10 false I4 5.969,3.813 6.719,4.615 0.75,0.802 10 false Airbag ECU Assembly 3.333,3.771 4.552,4.521 1.219,0.75 10 false Combination Meter Assembly 5.76,0.5 6.042,0.844 0.281,0.344 10 false 36 5.75,2.438 6.031,2.76 0.281,0.323 10 false 33 5.75,2.896 6.031,3.219 0.281,0.323 10 false 32 3.615,1.823 3.99,2.073 0.375,0.25 10 false IG+ 0.76,4.302 2.76,4.677 2,0.375 10 false : CAN Communication Line 2.813,0.594 4.281,1.052 1.469,0.458 10 false from IGR NO. 1 Relay 0.604,1.063 1.958,1.583 1.354,0.521 10 false from Engine Stop and Start ECU*1 3.396,2.438 3.573,2.75 0.177,0.313 10 false 1 3.604,2.542 3.99,2.833 0.385,0.292 10 false EP 0.51,1.833 2.344,2.25 1.833,0.417 10 false from IGR NO. 1 Relay*2 2.344,2.01 3.313,2.344 0.969,0.333 10 false METER-IGR 0.24,3.646 2.24,4.021 2,0.375 10 false *1: w/ Stop and Start System 0.24,3.948 2.24,4.323 2,0.375 10 false *2: w/o Stop and Start System 2.625,0.969 2.906,1.292 0.281,0.323 10 false *1 2.625,1.677 2.906,2 0.281,0.323 10 false *2

CAUTION / NOTICE / HINT

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>BEFORE DISCONNECTING BATTERY202307,999999,_V1,_106911,_0485800,RM100000002CEKY,

HINT:: When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.; Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>AUTOMATIC LEARNING CHART202307,999999,_V1,_106911,_0485800,RM100000002CEKZ,

Inspect the fuses for circuits related to this system before performing the following procedure.

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.CHECK VEHICLE CONTROL HISTORY (RoB)

Check for Vehicle Control History (RoB) codes.

Body Electrical > SRS Airbag > Utility

Tester Display
Vehicle Control History (RoB)

50005 444 55

Result:

Result	Proceed to
Code X210B is output	A
Code X210B is not output	B

2.CHECK AUXILIARY BATTERY VOLTAGE

4.CHECK SRS WARNING LIGHT OPERATION

2.CHECK AUXILIARY BATTERY VOLTAGE

Measure the voltage of the auxiliary battery with the ignition switch off.

Standard Voltage:: 11 to 14 V

Result:

Proceed to
OK
NG

3.CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

REPLACE OR RECHARGE BATTERY

3.CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

0.552,0.552 0.927,0.781 0.375,0.229 2.49,1.875 2.125,1.458 true 1.969,1.865 1.844,1.448 true 1.396,1.865 1.74,1.448 true 0.083,0.063 0.521,0.469 0.438,0.406 10 false *a 2.406,1.885 2.833,2.104 0.427,0.219 10 false IGR 1.313,1.885 1.74,2.104 0.427,0.219 10 false E2 1.906,1.885 2.333,2.104 0.427,0.219 10 false E1 0.615,0.583 0.917,0.792 0.302,0.208 10 false I47

*a	Front view of wire harness connector (to Airbag ECU Assembly)

Connect the cable to the negative (-) auxiliary battery terminal.

Turn the ignition switch to ON.

Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).

Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
I47-36 (IGR) - Body ground	Ignition switch ON	8 to 16 V

Turn the ignition switch off.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I47-33 (E1) - Body ground	Always	Below 1 Ω
I47-32 (E2) - Body ground	Always	Below 1 Ω

Result:

Proceed to
OK
NG

END (POWER SOURCE VOLTAGE DROPPED TEMPORARILY, BUT HAS RETURNED TO NORMAL)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK SRS WARNING LIGHT OPERATION

Turn the ignition switch to ON and check the SRS warning light condition.

HINT:: The primary check is performed for approximately 6 seconds after the ignition switch is turned to ON.

Result:

Result	Proceed to
After the primary check period, the SRS warning light remains on.	A
After the primary check period, the SRS warning light turns off and comes on again.	B

5.CHECK AUXILIARY BATTERY VOLTAGE

9.CHECK CAN COMMUNICATION SYSTEM

5.CHECK AUXILIARY BATTERY VOLTAGE

Measure the voltage of the auxiliary battery with the ignition switch off.

Standard Voltage:: 11 to 14 V

Result:

Proceed to
OK
NG

6.CHECK CONNECTOR (AIRBAG ECU ASSEMBLY SIDE)

REPLACE OR RECHARGE AUXILIARY BATTERY

6.CHECK CONNECTOR (AIRBAG ECU ASSEMBLY SIDE)

Turn the ignition switch off.

Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:: Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

Check that the connector is properly connected to the airbag ECU assembly.

OK:: The connector is properly connected.

HINT:: If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

Disconnect the connector from the airbag ECU assembly.

Check that the terminals of the connector are not deformed or damaged.

OK:: The terminals are not deformed or damaged.

Result:

Proceed to
OK
NG

7.CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

*a	Front view of wire harness connector (to Airbag ECU Assembly)

Connect the cable to the negative (-) auxiliary battery terminal.

Turn the ignition switch to ON.

Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).

Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
I47-36 (IGR) - Body ground	Ignition switch ON	8 to 16 V

Turn the ignition switch off.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I47-33 (E1) - Body ground	Always	Below 1 Ω
I47-32 (E2) - Body ground	Always	Below 1 Ω

Result:

Proceed to
OK
NG

8.CHECK SRS WARNING LIGHT

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK SRS WARNING LIGHT

1.719,1.594 1.719,1.146 false 0.802,0.99 1.073,1.24 0.271,0.25 10 false *1 2.688,1 3.052,1.26 0.365,0.26 10 false *2 1.656,1.604 2.021,1.865 0.365,0.26 10 false *3

*1	Combination Meter Assembly
*2	Airbag ECU Assembly
*3	Wire Harness

Turn the ignition switch to ON and check the SRS warning light condition.

OK:: After the primary check period, the SRS warning light turns off for approximately 10 seconds and then turns back on.

HINT:: The primary check period is approximately 6 seconds after the ignition switch is turned to ON.

Result:

Proceed to
OK
NG

REPLACE AIRBAG ECU ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL202307,999999,_58,_115188,_0510630,RM100000002BZXJ,

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL202307,999999,_58,_112289,_0501082,RM100000002BH9M,

9.CHECK CAN COMMUNICATION SYSTEM

Using the GTS, check if the CAN communication system is functioning normally.

OK:: CAN communication system is functioning normally.

HINT:: Refer to Communication Bus Check in CAN Communication System.; ·

for HEV Model:

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM (for HEV Model)>DIAGNOSIS SYSTEM202307,999999,_57,_104409,_0606038,RM100000002C0LE,

·

for Gasoline Model:

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM (for Gasoline Model)>DIAGNOSIS SYSTEM202307,999999,_57,_104409,_0605911,RM100000002C081,

Result:

Proceed to
OK
NG

10.CHECK AUXILIARY BATTERY VOLTAGE

GO TO CAN COMMUNICATION SYSTEM

for HEV Model: Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM (for HEV Model)>HOW TO PROCEED WITH TROUBLESHOOTING202307,999999,_57,_104409,_0606038,RM100000002C0LC,

for Gasoline Model: Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM (for Gasoline Model)>HOW TO PROCEED WITH TROUBLESHOOTING202307,202405,_57,_104409,_0605911,RM100000002C07Y,202405,999999,_57,_104409,_0605911,RM100000002NU3H,

10.CHECK AUXILIARY BATTERY VOLTAGE

Measure the voltage of the auxiliary battery with the ignition switch off.

Standard Voltage:: 11 to 14 V

Result:

Proceed to
OK
NG

11.CHECK CONNECTOR (AIRBAG ECU ASSEMBLY SIDE)

REPLACE OR RECHARGE AUXILIARY BATTERY

11.CHECK CONNECTOR (AIRBAG ECU ASSEMBLY SIDE)

Turn the ignition switch off.

Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:: Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

Check that the connector is properly connected to the airbag ECU assembly.

OK:: The connector is properly connected.

HINT:: If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

Disconnect the connector from the airbag ECU assembly.

Check that the terminals of the connector are not deformed or damaged.

OK:: The terminals are not deformed or damaged.

Result:

Proceed to
OK
NG

12.CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

*a	Front view of wire harness connector (to Airbag ECU Assembly)

Connect the cable to the negative (-) auxiliary battery terminal.

Turn the ignition switch to ON.

Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).

Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
I47-36 (IGR) - Body ground	Ignition switch ON	8 to 16 V

Turn the ignition switch off.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I47-33 (E1) - Body ground	Always	Below 1 Ω
I47-32 (E2) - Body ground	Always	Below 1 Ω

Result:

Proceed to
OK
NG

13.CHECK CONNECTOR (COMBINATION METER ASSEMBLY SIDE)

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.CHECK CONNECTOR (COMBINATION METER ASSEMBLY SIDE)

Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:: Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

Check that the connector is properly connected to the combination meter assembly.

OK:: The connector is properly connected.

HINT:: If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

Disconnect the connector from the combination meter assembly.

Check that the terminals of the connector are not deformed or damaged.

OK:: The terminals are not deformed or damaged.

Result:

Proceed to
OK
NG

14.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

1.469,0.219 1.885,0.469 0.417,0.25 2.656,0.958 2.99,0.625 true 0.396,0.708 0.927,1.021 true 0.083,0.052 0.51,0.406 0.427,0.354 10 false *a 3.042,0.5 3.375,0.719 0.333,0.219 10 false IG+ 0.135,0.615 0.438,0.885 0.302,0.271 10 false ES 1.615,0.25 1.948,0.427 0.333,0.177 10 false I4

*a	Front view of wire harness connector (to Combination Meter Assembly)

Connect the cable to the negative (-) auxiliary battery terminal.

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
I4-6 (IG+) - Body ground	Ignition switch ON	10.5 to 16 V*1
I4-6 (IG+) - Body ground	Ignition switch ON	11 to 14 V*2

*1: w/ Stop and Start System

*2: w/o Stop and Start System

Turn the ignition switch off.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I4-1 (EP) - Body ground	Always	Below 1 Ω
I4-2 (ES) - Body ground	Always	Below 1 Ω

Result:

Proceed to
OK
NG

15.CHECK SRS WARNING LIGHT

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.CHECK SRS WARNING LIGHT

1.719,1.594 1.719,1.146 false 0.802,0.99 1.073,1.24 0.271,0.25 10 false *1 2.688,1 3.052,1.26 0.365,0.26 10 false *2 1.656,1.604 2.021,1.865 0.365,0.26 10 false *3

*1	Combination Meter Assembly
*2	Airbag ECU Assembly
*3	Wire Harness

Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:: Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

Connect the connector to the combination meter assembly.

Connect the cable to the negative (-) auxiliary battery terminal.

Turn the ignition switch to ON and check the SRS warning light condition.

OK:: After the primary check period, the SRS warning light turns off for approximately 10 seconds and then turns back on.

HINT:: The primary check period is approximately 6 seconds after the ignition switch is turned to ON.

Result:

Proceed to
OK
NG

REPLACE AIRBAG ECU ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL202307,999999,_58,_115188,_0510630,RM100000002BZXJ,

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL202307,999999,_58,_112289,_0501082,RM100000002BH9M,