Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000002779Q
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): B181A-B181D; Short in Passenger Side Airbag Variable Vent Hole Squib Circuit; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

DTC

B181A

Short in Passenger Side Airbag Variable Vent Hole Squib Circuit

DTC

B181B

Open in Passenger Side Airbag Variable Vent Hole Squib Circuit

DTC

B181C

Short to GND in Passenger Side Airbag Variable Vent Hole Squib Circuit

DTC

B181D

Short to B+ in Passenger Side Airbag Variable Vent Hole Squib Circuit

DESCRIPTION

The passenger side airbag variable vent hole squib circuit consists of the airbag sensor assembly and instrument panel passenger airbag assembly.

The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the passenger side airbag variable vent hole squib circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B181A

Short in Passenger Side Airbag Variable Vent Hole Squib Circuit

  • The airbag sensor assembly detects a line short in the passenger side airbag variable vent hole squib circuit during the primary check.
  • Passenger side airbag variable vent hole squib malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • No. 2 instrument panel wire
  • Passenger side airbag variable vent hole squib (Instrument panel passenger airbag assembly)
  • Airbag sensor assembly

Comes on

Applies to check mode

B181B

Open in Passenger Side Airbag Variable Vent Hole Squib Circuit

  • The airbag sensor assembly detects an open in the passenger side airbag variable vent hole squib circuit.
  • Passenger side airbag variable vent hole squib malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • No. 2 instrument panel wire
  • Passenger side airbag variable vent hole squib (Instrument panel passenger airbag assembly)
  • Airbag sensor assembly

Comes on

Applies to check mode

B181C

Short to GND in Passenger Side Airbag Variable Vent Hole Squib Circuit

  • The airbag sensor assembly detects a short to ground in the passenger side airbag variable vent hole squib circuit.
  • Passenger side airbag variable vent hole squib malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • No. 2 instrument panel wire
  • Passenger side airbag variable vent hole squib (Instrument panel passenger airbag assembly)
  • Airbag sensor assembly

Comes on

Applies to check mode

B181D

Short to B+ in Passenger Side Airbag Variable Vent Hole Squib Circuit

  • The airbag sensor assembly detects a short to B+ in the passenger side airbag variable vent hole squib circuit.
  • Passenger side airbag variable vent hole squib malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • No. 2 instrument panel wire
  • Passenger side airbag variable vent hole squib (Instrument panel passenger airbag assembly)
  • Airbag sensor assembly

Comes on

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 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART

HINT:

  • Perform the simulation method by selecting check mode (Signal Check) using the Techstream.

    Click here 2020 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 11/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): CHECK MODE PROCEDURE

  • After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road.

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

CHECK CONNECTORS

(a) Turn the ignition switch off.

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*3

No. 2 Instrument Panel Wire

*4

Instrument Panel Wire

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the instrument panel passenger airbag assembly and airbag sensor assembly. Also check that the connectors that link the instrument panel wire and No. 2 instrument panel wire are properly connected.

OK:

The connectors are properly connected.

HINT:

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

(d) Disconnect the connectors from the instrument panel passenger airbag assembly and airbag sensor assembly. Also disconnect the instrument panel wire from the No. 2 instrument panel wire.

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

OK:

The terminals are not deformed or damaged.

(f) Check that the No. 2 instrument panel wire connector (on the instrument panel passenger airbag assembly side) is not loose, deformed or damaged.

OK:

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

(g) Check that the short springs of the activation prevention mechanisms of the instrument panel wire connector and No. 2 instrument panel wire connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

NG

REPLACE WIRE HARNESS

OK

2.

CHECK INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY

(a) Connect the instrument panel wire to the No. 2 instrument panel wire and airbag sensor assembly.

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*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 E (green connector).

CAUTION:

Never connect a 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 it.
  • Insert SST straight into the terminals of the connector.

SST: 09843-18061

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

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

(e) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the ignition switch off.

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

(h) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B181A, B181B, B181C or B181D is not output.

HINT:

Codes other than DTCs B181A, B181B, B181C and B181D may be output at this time, but they are not related to this check.

(i) Turn the ignition switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(k) Disconnect SST from connector E.

OK

REPLACE INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY

NG

3.

CHECK PASSENGER SIDE AIRBAG VARIABLE VENT HOLE SQUIB CIRCUIT

(a) Disconnect the instrument panel wire from the airbag sensor assembly.

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Instrument Panel Passenger Airbag Assembly)

*b

Color: Green

(b) Check for a short to B+ in the circuit.

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

(2) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

g3-2 (VHP+) - Body ground

Ignition switch ON

Below 1 V

g3-1 (VHP-) - Body ground

Ignition switch ON

Below 1 V

(4) Turn the ignition switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check for an open in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

g3-2 (VHP+) - g3-1 (VHP-)

Always

Below 1 Ω

(d) Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

g3-2 (VHP+) - Body ground

Always

1 MΩ or higher

g3-1 (VHP-) - Body ground

Always

1 MΩ or higher

(e) Check for a short in the circuit.

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

Click here 2021 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 11/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): SYSTEM DESCRIPTION

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

g3-2 (VHP+) - g3-1 (VHP-)

Always

1 MΩ or higher

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

NG

GO TO STEP 5

OK

4.

CHECK DTC

(a) Connect the connectors to the instrument panel passenger airbag assembly and airbag sensor assembly.

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

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

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

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the ignition switch off.

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

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B181A, B181B, B181C or B181D is not output.

HINT:

Codes other than DTCs B181A, B181B, B181C and B181D may be output at this time, but they are not related to this check.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE AIRBAG SENSOR ASSEMBLY

5.

CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the No. 2 instrument panel wire from the instrument panel wire.

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*3

No. 2 Instrument Panel Wire

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to No. 2 Instrument Panel Wire)

(b) Check for a short to B+ in the circuit.

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

(2) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Ig2-1 (P3+) - Body ground

Ignition switch ON

Below 1 V

Ig2-2 (P3-) - Body ground

Ignition switch ON

Below 1 V

(4) Turn the ignition switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check for an open in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Ig2-1 (P3+) - Ig2-2 (P3-)

Always

Below 1 Ω

(d) Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Ig2-1 (P3+) - Body ground

Always

1 MΩ or higher

Ig2-2 (P3-) - Body ground

Always

1 MΩ or higher

(e) Check for a short in the circuit.

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

Click here 2021 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 11/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): SYSTEM DESCRIPTION

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Ig2-1 (P3+) - Ig2-2 (P3-)

Always

1 MΩ or higher

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

NG

REPLACE INSTRUMENT PANEL WIRE

OK

6.

CHECK NO. 2 INSTRUMENT PANEL WIRE

(a) Check for a short to B+ in the circuit.

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

(2) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

g3-2 (VHP+) - Body ground

Ignition switch ON

Below 1 V

g3-1 (VHP-) - Body ground

Ignition switch ON

Below 1 V

(4) Turn the ignition switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

*1

Instrument Panel Passenger Airbag Assembly

*2

Airbag Sensor Assembly

*3

No. 2 Instrument Panel Wire

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to Instrument Panel Passenger Airbag Assembly)

*b

Color: Green

(b) Check for an open in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

g3-2 (VHP+) - g3-1 (VHP-)

Always

Below 1 Ω

(c) Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

g3-2 (VHP+) - Body ground

Always

1 MΩ or higher

g3-1 (VHP-) - Body ground

Always

1 MΩ or higher

(d) Check for a short in the circuit.

(1) Release the activation prevention mechanism built into connector D.

Click here 2021 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 11/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): SYSTEM DESCRIPTION

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

g3-2 (VHP+) - g3-1 (VHP-)

Always

1 MΩ or higher

(3) Restore the released activation prevention mechanism of connector D to the original condition.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE NO. 2 INSTRUMENT PANEL WIRE