RM35X0E _58 Vehicle Interior _079257 SUPPLEMENTAL RESTRAINT SYSTEMS _0385034 AIRBAG SYSTEM(for Type B) C

SUPPLEMENTAL RESTRAINT SYSTEMS AIRBAG SYSTEM(for Type B) B1825 Short in Side Squib (LH) Circuit B1826 Open in Side Squib (LH) Circuit B1827 Short in Side Squib (LH) Circuit (to Ground) B1828 Short in Side Squib (LH) Circuit (to +B)

DESCRIPTION

The front side squib LH circuit consists of the airbag sensor assembly and front seat airbag assembly LH.

The circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the front side squib LH circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1825	Short in Side Squib (LH) Circuit	One of the following conditions is met: · The airbag sensor assembly detects a line short circuit signal 5 times in the front side squib LH circuit during the primary check. · A front seat airbag assembly LH malfunction. · An airbag sensor assembly malfunction.	· Front seat wire LH · Floor wire · Front seat airbag assembly LH · Airbag sensor assembly	Comes on	Applicable
B1826	Open in Side Squib (LH) Circuit	One of the following conditions is met: · The airbag sensor assembly detects an open circuit signal in the front side squib LH circuit for 2 seconds. · A front seat airbag assembly LH malfunction. · An airbag sensor assembly malfunction.	· Front seat wire LH · Floor wire · Front seat airbag assembly LH · Airbag sensor assembly	Comes on	Applicable
B1827	Short in Side Squib (LH) Circuit (to Ground)	One of the following conditions is met: · The airbag sensor assembly detects a short circuit to ground signal in the front side squib LH circuit for 0.5 seconds. · A front seat airbag assembly LH malfunction. · An airbag sensor assembly malfunction.	· Front seat wire LH · Floor wire · Front seat airbag assembly LH · Airbag sensor assembly	Comes on	Applicable
B1828	Short in Side Squib (LH) Circuit (to +B)	One of the following conditions is met: · The airbag sensor assembly detects a short circuit to B+ signal in the front side squib LH circuit for 0.5 seconds. · A front seat airbag assembly LH malfunction. · An airbag sensor assembly malfunction.	· Front seat wire LH · Floor wire · Front seat airbag assembly LH · Airbag sensor assembly	Comes on	Applicable

WIRING DIAGRAM

0.49,1.698 0.948,1.896 0.458,0.198 10 false n3 0.49,1.865 2.563,2.031 2.073,0.167 10 false Front Seat Airbag Assembly LH 1.698,0.313 1.844,0.49 0.146,0.177 10 false 1 1.688,1.115 1.833,1.292 0.146,0.177 10 false 2 5.302,0.344 5.51,0.521 0.208,0.177 10 false 16 5.302,1.115 5.49,1.292 0.188,0.177 10 false 15 5.594,0.448 5.958,0.646 0.365,0.198 10 false SFL+ 5.594,1.229 5.958,1.427 0.365,0.198 10 false SFL- 5.427,1.708 5.885,1.906 0.458,0.198 10 false V1 5.427,1.865 7.094,2.198 1.667,0.333 10 false Airbag Sensor Assembly 3.531,0.24 3.677,0.417 0.146,0.177 10 false 1 3.563,1.01 3.708,1.188 0.146,0.177 10 false 2 3.417,0.677 3.781,0.875 0.365,0.198 10 false SFL+ 3.448,1.458 3.813,1.656 0.365,0.198 10 false SFL- 3.448,0.458 3.813,0.656 0.365,0.198 10 false Vn1 3.448,1.229 3.813,1.427 0.365,0.198 10 false Vn1

CAUTION / NOTICE / HINT

NOTICE:

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

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>BEFORE DISCONNECTING BATTERY201902,999999,_V1,_081196,_0393338,RM100000001HX6Q,

When disconnecting and reconnecting the battery

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>WORK PROCEDURE201902,201906,_V1,_081196,_0393338,RM100000001HX6R,201906,999999,_V1,_081196,_0393338,RM100000001JBY9,

HINT:: When disconnecting and reconnecting the 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 CHART201902,201906,_V1,_081196,_0393338,RM100000001HX6S,201906,999999,_V1,_081196,_0393338,RM100000001IWEY,

After replacing the airbag sensor assembly, refer to initialization.

Click hereGeneral>SETUP>WHEN REPLACING OR REMOVING/INSTALLING PARTS>WORK PROCEDURE201902,201906,_V1,_081196,_0393339,RM100000001HX6U,201906,202005,_V1,_081196,_0393339,RM100000001IWEZ,202005,202107,_V1,_081196,_0393339,RM100000001M43S,202107,202208,_V1,_081196,_0393339,RM100000001WMAF,202208,999999,_V1,_081196,_0393339,RM1000000024IQN,

HINT:: To perform the simulation method, enter check mode (signal check) with the GTS (Click here Vehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type B)>CHECK MODE PROCEDURE201902,999999,_58,_079257,_0385034,RM100000001GJQ0,), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (Click here General>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING201902,999999,_V1,_078841,_0386803,RM100000001GTWY,).

PROCEDURE

1.CHECK CONNECTORS

0.521,0.531 0.833,0.729 0.313,0.198 10 false *1 1.563,0.521 1.875,0.719 0.313,0.198 10 false *4 2.458,1.594 2.771,1.792 0.313,0.198 10 false *2 0.99,0.521 1.302,0.719 0.313,0.198 10 false *3

*1	Front Seat Airbag Assembly LH
*2	Airbag Sensor Assembly
*3	Front Seat Wire LH
*4	Floor Wire

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Check that the connectors are properly connected to the front seat airbag assembly LH and airbag sensor assembly.

OK:: The connectors are properly connected.

HINT:: If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

Disconnect the connectors from the front seat airbag assembly LH and airbag sensor assembly also disconnect the front seat wire LH from the floor wire.

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

OK:: The terminals are not deformed or damaged.

Check that the short springs of the activation prevention mechanism of the floor wire connector are not deformed or damaged.

OK:: The short springs are not deformed or damaged.

Result:

Proceed to
OK
NG

2.CHECK FRONT SEAT AIRBAG ASSEMBLY LH

REPLACE FLOOR WIRE OR FRONT SEAT WIRE LH

2.CHECK FRONT SEAT AIRBAG ASSEMBLY LH

0.438,2.167 0.802,2.417 0.365,0.25 2.115,2.667 2.292,2.813 2.292,2.813 2.458,2.813 true 0.438,0.5 0.76,0.771 0.323,0.271 10 false *1 2.51,1.229 2.885,1.552 0.375,0.323 10 false *2 0.438,1.698 0.771,2.115 0.333,0.417 10 false *a 2.51,2.729 2.844,3.146 0.333,0.417 10 false *3 0.531,2.208 0.958,2.573 0.427,0.365 10 false n3 2.031,0.25 2.406,0.573 0.375,0.323 10 false A 1.854,0.25 2.229,0.573 0.375,0.323 10 false B 1.417,0.25 1.792,0.573 0.375,0.323 10 false C 1.25,0.25 1.625,0.573 0.375,0.323 10 false D 0.813,0.25 1.188,0.573 0.375,0.323 10 false E 0.583,0.25 0.958,0.573 0.375,0.323 10 false F

*1	Front Seat Airbag Assembly LH
*2	Airbag Sensor Assembly
*3	SST
*a	Front view of wire harness connector (to Front Seat Airbag Assembly LH)

Connect the floor wire to the front seat wire LH and airbag sensor assembly.

Connect the red wire side of SST (resistance: 2.1 Ω) to connector E.

CAUTION:: Never connect the tester to the front seat airbag assembly LH for measurement, as this may lead to a serious injury due to airbag deployment.

NOTICE:: ·

Do not forcibly insert SST into the terminals of the connector when connecting SST.

·

Insert SST straight into the terminals of the connector.

SST: 09843-18061

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in memory.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type B)>DTC CHECK / CLEAR201902,999999,_58,_079257,_0385034,RM100000001GJPZ,

Body Electrical > SRS Airbag > Clear DTCs: 50002 188

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type B)>DTC CHECK / CLEAR201902,999999,_58,_079257,_0385034,RM100000001GJPZ,

Body Electrical > SRS Airbag > Trouble Codes: 50001 188

Result:

Proceed to
DTCs B1825, B1826, B1827 and B1828 are not output
DTC B1825, B1826, B1827 or B1828 is output

HINT:: Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Disconnect SST from connector E.

DTCs B1825, B1826, B1827 and B1828 are not output

REPLACE FRONT SEAT AIRBAG ASSEMBLY LH

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>FRONT SEAT SIDE AIRBAG ASSEMBLY (for Separate Seat Type)>REMOVAL201902,201906,_58,_079257,_0384940,RM100000001GJ8N,201906,999999,_58,_079257,_0384940,RM100000001IW5E,

DTC B1825, B1826, B1827 or B1828 is output

3.CHECK FRONT SEAT AIRBAG ASSEMBLY LH CIRCUIT

0.76,1.969 1.156,2.229 0.396,0.26 0.417,0.5 0.729,0.656 0.313,0.156 10 false *1 2.479,1.125 2.792,1.281 0.313,0.156 10 false *2 1.073,0.469 1.385,0.625 0.313,0.156 10 false *3 0.708,1.458 1.021,1.615 0.313,0.156 10 false *a 1.26,0.281 1.438,0.469 0.177,0.188 10 false D 1.406,0.281 1.583,0.469 0.177,0.188 10 false C 1.854,0.281 2.031,0.469 0.177,0.188 10 false B 2.135,0.271 2.313,0.458 0.177,0.188 10 false A 0.875,2.031 1.188,2.188 0.313,0.156 10 false n3 1.625,0.49 1.938,0.646 0.313,0.156 10 false *4 0.844,0.271 1.021,0.458 0.177,0.188 10 false E 0.625,0.271 0.802,0.458 0.177,0.188 10 false F

*1	Front Seat Airbag Assembly LH
*2	Airbag Sensor Assembly
*3	Front Seat Wire LH
*4	Floor Wire
*a	Front view of wire harness connector (to Front Seat Airbag Assembly LH)
	Release the activation prevention mechanism

Disconnect the floor wire from the front seat wire LH.

Check for a short to B+ in the circuit.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

ii.

Turn the ignition switch to ON.

iii.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
n3-1 - Body ground	Ignition switch ON	Below 1 V
n3-2 - Body ground	Ignition switch ON	Below 1 V

iv.

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Check for an open in the circuit.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
n3-1 - n3-2	Always	Below 1 Ω

Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
n3-1 - Body ground	Always	1 MΩ or higher
n3-2 - Body ground	Always	1 MΩ or higher

Check for a short in the circuit.

Release the activation prevention mechanism built into connector B.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type B)>SYSTEM DESCRIPTION201902,999999,_58,_079257,_0385034,RM100000001GJPU,

ii.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
n3-1 - n3-2	Always	1 MΩ or higher

iii.

Restore the released activation prevention mechanism of connector B to the original condition.

Result:

Proceed to
OK
NG

4.CHECK DTC

5.CHECK FLOOR WIRE

4.CHECK DTC

0.688,0.979 1,1.177 0.313,0.198 10 false *1 2.302,1.594 2.615,1.792 0.313,0.198 10 false *2

*1	Front Seat Airbag Assembly LH
*2	Airbag Sensor Assembly

Connect the connectors to the front seat airbag assembly LH and airbag sensor assembly.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in memory.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type B)>DTC CHECK / CLEAR201902,999999,_58,_079257,_0385034,RM100000001GJPZ,

Body Electrical > SRS Airbag > Clear DTCs: 50002 188

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type B)>DTC CHECK / CLEAR201902,999999,_58,_079257,_0385034,RM100000001GJPZ,

Body Electrical > SRS Airbag > Trouble Codes: 50001 188

Result:

Proceed to
DTCs B1825, B1826, B1827 and B1828 are not output
DTC B1825, B1826, B1827 or B1828 is output

HINT:: Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.

DTCs B1825, B1826, B1827 and B1828 are not output

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING201902,999999,_V1,_078841,_0386803,RM100000001GTWY,

DTC B1825, B1826, B1827 or B1828 is output

REPLACE AIRBAG SENSOR ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL201902,201906,_58,_079257,_0384942,RM100000001GJ8V,201906,999999,_58,_079257,_0384942,RM100000001IN22,

5.CHECK FLOOR WIRE

0.177,1.99 0.573,2.25 0.396,0.26 0.552,2.625 0.688,2.625 0.688,2.625 1.021,2.24 true 1.646,2.604 1.5,2.604 1.5,2.604 1.229,2.219 true 0.656,0.823 0.969,0.979 0.313,0.156 10 false *1 2.802,1.479 3.115,1.635 0.313,0.156 10 false *2 1.146,0.406 1.458,0.563 0.313,0.156 10 false *3 0.177,1.448 0.49,1.604 0.313,0.156 10 false *a 1.396,0.594 1.573,0.781 0.177,0.188 10 false D 1.646,0.604 1.823,0.792 0.177,0.188 10 false C 2.083,0.604 2.26,0.792 0.177,0.188 10 false B 2.365,0.594 2.542,0.781 0.177,0.188 10 false A 0.25,2.052 0.563,2.208 0.313,0.156 10 false Vn1 1.688,2.521 2.219,2.708 0.531,0.188 10 false SFL- 0.188,2.531 0.719,2.719 0.531,0.188 10 false SFL+ 1.844,0.406 2.156,0.563 0.313,0.156 10 false *4 0.948,0.615 1.125,0.802 0.177,0.188 10 false E 0.719,0.604 0.896,0.792 0.177,0.188 10 false F

*1	Front Seat Airbag Assembly LH
*2	Airbag Sensor Assembly
*3	Front Seat Wire LH
*4	Floor Wire
*a	Front view of wire harness connector (to Front Seat Airbag Assembly LH)
	Release the activation prevention mechanism

Disconnect the floor wire from the front seat wire LH.

Check for a short to B+ in the circuit.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

ii.

Turn the ignition switch to ON.

iii.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
Vn1-1 (SFL+) - Body ground	Ignition switch ON	Below 1 V
Vn1-2 (SFL-) - Body ground	Ignition switch ON	Below 1 V

iv.

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Check for an open in the circuit.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Vn1-1 (SFL+) - Vn1-2 (SFL-)	Always	Below 1 Ω

Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Vn1-1 (SFL+) - Body ground	Always	1 MΩ or higher
Vn1-2 (SFL-) - Body ground	Always	1 MΩ or higher

Check for a short in the circuit.

Release the activation prevention mechanism built into connector B.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type B)>SYSTEM DESCRIPTION201902,999999,_58,_079257,_0385034,RM100000001GJPU,

ii.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Vn1-1 (SFL+) - Vn1-2 (SFL-)	Always	1 MΩ or higher

iii.

Restore the released activation prevention mechanism of connector B to the original condition.

Result:

Proceed to
OK
NG

REPLACE FRONT SEAT WIRE LH

REPLACE FLOOR WIRE