Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM10000000289VO
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B18751A; Passenger Seat Cushion Airbag Squib Circuit Resistance Below Threshold; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

DTC

B18751A

Passenger Seat Cushion Airbag Squib Circuit Resistance Below Threshold

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

DTC Output from

Priority

Test Mode / Check Mode

B18751A

Passenger Seat Cushion Airbag Squib Circuit Resistance Below Threshold
  • The airbag sensor assembly detects a line short in the passenger side front seat cushion squib circuit for 2 seconds during the primary check.
  • Front seat cushion airbag assembly RH malfunction
  • Airbag sensor assembly malfunction
  • Harness or connector
  • Front seat cushion airbag assembly RH
  • Airbag sensor assembly

Comes on

SRS Airbag

A

Applies to check mode

WIRING DIAGRAM

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 here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: BEFORE DISCONNECTING BATTERY

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART

  • After replacing the airbag sensor assembly, refer to work procedure.

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - 03/2023]; SETUP: WHEN REPLACING OR REMOVING/INSTALLING PARTS: WORK PROCEDURE 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2023 - 08/2023]; SETUP: WHEN REPLACING OR REMOVING/INSTALLING PARTS: WORK PROCEDURE 2024 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2023 -        ]; SETUP: WHEN REPLACING OR REMOVING/INSTALLING PARTS: WORK PROCEDURE

HINT:

  • To perform the simulation method, enter check mode (signal check) with the GTS.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: CHECK MODE PROCEDURE

  • Perform the simulation method while checking the Data List.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DATA LIST / ACTIVE TEST

PROCEDURE

1.

CLEAR DTC

Pre-procedure1

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

Procedure1

(b) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

Post-procedure1

(c) Turn the ignition switch off.

NEXT

2.

CHECK DTC

Pre-procedure1

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

Procedure1

(b) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

Result

Proceed to

B18751A is output

A

B18751A is not output

B

Post-procedure1

(c) None

B

USE SIMULATION METHOD TO CHECK

A

3.

CHECK CONNECTION OF CONNECTORS

Pre-procedure1

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

Procedure1

(c) Check that the connectors are properly connected to the front seat cushion airbag assembly RH and airbag sensor assembly.

OK:

The connectors are properly connected.

Post-procedure1

(d) None

NG

CONNECT CONNECTORS PROPERLY
OK

4.

CHECK CONNECTORS

Pre-procedure1

(a) Disconnect the airbag sensor assembly connector.

*1

Front Seat Cushion Airbag Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Disconnect the front seat cushion airbag assembly RH connector.

Procedure1

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

OK:

The terminals are not deformed or damaged.

(d) Check that the short springs of the activation prevention mechanism of the wire harness connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

Post-procedure1

(e) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CLEAR DTC

Pre-procedure1

(a) Connect the airbag sensor assembly connector.

*A

for Hatchback

*B

for Sedan

*1

Front Seat Cushion Airbag Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

*4

SST

*a

Front view of wire harness connector

(to Front Seat Cushion Airbag Assembly RH)

(b) Connect SST (resistance: 2.1 Ω) to connector C.

CAUTION:

Never connect the tester to the front seat cushion airbag assembly RH 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

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

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

Procedure1

(e) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

Post-procedure1

(f) Turn the ignition switch off.

NEXT

6.

CHECK FRONT SEAT CUSHION AIRBAG ASSEMBLY RH

Pre-procedure1

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

Procedure1

(b) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

Result

Proceed to

B18751A is not output

A

B18751A is output

B

HINT:

Codes other than DTC B18751A may be output at this time, but they are not related to this check.

Post-procedure1

(c) Turn the ignition switch off.

(d) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

(e) Disconnect SST from connector C.

A

REPLACE FRONT SEAT CUSHION AIRBAG ASSEMBLY RH

B

7.

CHECK HARNESS AND CONNECTOR

Pre-procedure1

(a) Disconnect the airbag sensor assembly connector.

*A

for Hatchback

*B

for Sedan

*1

Front Seat Cushion Airbag Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Front Seat Cushion Airbag Assembly RH)

Release the activation prevention mechanism

(b) Release the activation prevention mechanism built into connector B.

HINT:

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: SYSTEM DESCRIPTION

Procedure1

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

Standard Resistance:

for Hatchback

Tester Connection

Condition

Specified Condition

O16-1 (FCP-) - O16-2 (FCP+)

Always

1 MΩ or higher

for Sedan

Tester Connection

Condition

Specified Condition

Of1-1 (FCP-) - Of1-2 (FCP+)

Always

1 MΩ or higher

Post-procedure1

(d) Restore the released activation prevention mechanism of connector B to its original condition.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CLEAR DTC

Pre-procedure1

(a) Connect the airbag sensor assembly connector.

*1

Front Seat Cushion Airbag Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Connect the front seat cushion airbag assembly RH connector.

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

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

Procedure1

(e) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

Post-procedure1

(f) Turn the ignition switch off.

NEXT

9.

CHECK DTC

Pre-procedure1

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

Procedure1

(b) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

Result

Proceed to

B18751A is not output

A

B18751A is output

B

HINT:

Codes other than DTC B18751A may be output at this time, but they are not related to this check.

Post-procedure1

(c) None

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG SENSOR ASSEMBLY