Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000289VI
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B181A12; Passenger Seat Airbag Variable Vent Hole Squib Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

DTC

B181A12

Passenger Seat Airbag Variable Vent Hole Squib Circuit Short to Battery

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

DTC Output from

Priority

Test Mode / Check Mode

B181A12

Passenger Seat Airbag Variable Vent Hole Squib Circuit Short to Battery
  • The airbag sensor assembly detects a short to +B in the front passenger side airbag variable vent hole squib circuit for 0.5 seconds.
  • Instrument panel passenger airbag assembly malfunction
  • Airbag sensor assembly malfunction
  • Harness or connector
  • Instrument panel passenger airbag assembly
  • 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

B181A12 is output

A

B181A12 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 instrument panel passenger airbag assembly 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

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Disconnect the instrument panel passenger airbag assembly 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 connectors are not loose, deformed or damaged.

OK:

The connector locking button is not disengaged, and the claw of the lock is not deformed or damaged.

(e) 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

(f) None

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CLEAR DTC

Pre-procedure1

(a) Connect the airbag sensor assembly connector.

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

*4

SST

*a

Front view of wire harness connector

(to Instrument Panel Passenger Airbag Assembly)

*b

Color: Green

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

CAUTION:

Never connect the tester to the instrument panel passenger airbag assembly 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 INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY

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

B181A12 is not output

A

B181A12 is output

B

HINT:

Codes other than DTC B181A12 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 INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY

B

7.

CHECK HARNESS AND CONNECTOR

Pre-procedure1

(a) Disconnect the airbag sensor assembly connector.

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

(c) Turn the ignition switch to ON.

Procedure1

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

g3-1 (VHP-) - Body ground

Ignition switch ON

Below 1 V

g3-2 (VHP+) - Body ground

Ignition switch ON

Below 1 V

Result:

Proceed to

OK

NG

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Instrument Panel Passenger Airbag Assembly)

*b

Color: Green

Post-procedure1

(e) Turn the ignition switch off.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CLEAR DTC

Pre-procedure1

(a) Connect the airbag sensor assembly connector.

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Connect the instrument panel passenger airbag assembly 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

B181A12 is not output

A

B181A12 is output

B

HINT:

Codes other than DTC B181A12 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