Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000259YD
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM (for TMC Made): LIN Communication Circuit; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]

LIN Communication Circuit

DESCRIPTION

Error Code

Detection Item

Detection Condition

Trouble Area

17

FI LIN Communication Lost

When a communication malfunction with the load sensor is detected
  • Harness or connector
  • Front seat adjuster assembly RH (front occupant classification sensor LH)
  • Airbag sensor assembly

18

RI LIN Communication Lost

When a communication malfunction with the load sensor is detected
  • Harness or connector
  • Front seat adjuster assembly RH (rear occupant classification sensor LH)
  • Airbag sensor assembly

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 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 or front seat adjuster assembly RH, refer to work procedure.

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HINT:

  • If it is difficult to perform troubleshooting (wire harness inspection), remove the front passenger seat installation bolts to see under the seat cushion.
  • In the above case, lift and hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

PROCEDURE

1.

CHECK ERROR CODE

(a) Check the Error Code.

Result

Proceed to

Error code 17 is output

A

Error code 18 is output

B

Error code 17 and 18 are output

C
B

GO TO STEP 7

C

GO TO STEP 12

A

2.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

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

(c) Check that the connectors are properly connected to the airbag sensor assembly and front seat adjuster assembly RH (front occupant classification sensor LH).

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

3.

CHECK CONNECTORS

(a) Disconnect the airbag sensor assembly connector.

*1

Front Seat Adjuster Assembly RH (Front Occupant Classification Sensor LH)

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Disconnect the front seat adjuster assembly RH (front occupant classification sensor LH) connector.

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

OK:

The terminals are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O17-24 (SVC) - j6-1 (SVC)

Always

Below 1 Ω

O17-32 (SIG) - j6-2 (SIG)

Always

Below 1 Ω

O17-31 (SGD) - j6-3 (SGD)

Always

Below 1 Ω

*1

Front Seat Adjuster Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Seat Adjuster Assembly RH (Front Occupant Classification Sensor LH))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH

(a) Connect the airbag sensor assembly connector.

(b) Replace the front seat adjuster assembly RH with a new one.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SEAT: FRONT SEAT ASSEMBLY (for Manual Seat): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SEAT: FRONT SEAT ASSEMBLY (for Manual Seat): REMOVAL

NEXT

6.

PERFORM ZERO POINT CALIBRATION

(a) Using the GTS, perform "Occupant Detection Sensor Zero Point Calibration".

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM (for TMC Made): INITIALIZATION

NEXT

END

7.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

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

(c) Check that the connectors are properly connected to the airbag sensor assembly and front seat adjuster assembly RH (rear occupant classification sensor LH).

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

8.

CHECK CONNECTORS

(a) Disconnect the airbag sensor assembly connector.

*1

Front Seat Adjuster Assembly RH (Rear Occupant Classification Sensor LH)

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Disconnect the front seat adjuster assembly RH (rear occupant classification sensor LH) connector.

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

OK:

The terminals are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O17-24 (SVC) - j7-1 (SVC)

Always

Below 1 Ω

O17-32 (SIG) - j7-2 (SIG)

Always

Below 1 Ω

O17-31 (SGD) - j7-3 (SGD)

Always

Below 1 Ω

*1

Front Seat Adjuster Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Seat Adjuster Assembly RH (Rear Occupant Classification Sensor LH))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH

(a) Connect the airbag sensor assembly connector.

(b) Replace the front seat adjuster assembly RH with a new one.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SEAT: FRONT SEAT ASSEMBLY (for Manual Seat): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SEAT: FRONT SEAT ASSEMBLY (for Manual Seat): REMOVAL

NEXT

11.

PERFORM ZERO POINT CALIBRATION

(a) Using the GTS, perform "Occupant Detection Sensor Zero Point Calibration".

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM (for TMC Made): INITIALIZATION

NEXT

END

12.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

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

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

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

13.

CHECK CONNECTORS

(a) Disconnect the airbag sensor assembly connector.

*1

Front Seat Adjuster Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Disconnect the front seat adjuster assembly RH connector.

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

OK:

The terminals are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

14.

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O17-24 (SVC) - j6-1 (SVC)

Always

Below 1 Ω

O17-24 (SVC) - j7-1 (SVC)

Always

Below 1 Ω

O17-32 (SIG) - j6-2 (SIG)

Always

Below 1 Ω

O17-32 (SIG) - j7-2 (SIG)

Always

Below 1 Ω

O17-31 (SGD) - j6-3 (SGD)

Always

Below 1 Ω

O17-31 (SGD) - j7-3 (SGD)

Always

Below 1 Ω

*1

Front Seat Adjuster Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Seat Adjuster Assembly RH (Front Occupant Classification Sensor LH))

*c

Front view of wire harness connector

(to Front Seat Adjuster Assembly RH (Rear Occupant Classification Sensor LH))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

15.

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O17-32 (SIG) - Other terminals and body ground

Always

10 kΩ or higher

j6-2 (SIG) - Other terminals and body ground

Always

10 kΩ or higher

j7-2 (SIG) - Other terminals and body ground

Always

10 kΩ or higher

*1

Front Seat Adjuster Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Seat Adjuster Assembly RH (Front Occupant Classification Sensor LH))

*c

Front view of wire harness connector

(to Front Seat Adjuster Assembly RH (Rear Occupant Classification Sensor LH))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

16.

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY RH)

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

*1

Front Seat Adjuster Assembly RH

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Seat Adjuster Assembly RH (Front Occupant Classification Sensor LH))

*c

Front view of wire harness connector

(to Front Seat Adjuster Assembly RH (Rear Occupant Classification Sensor LH))

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O17-32 (SIG) - Body ground

Ignition switch ON

Below 1 V

j6-2 (SIG) - Body ground

Ignition switch ON

Below 1 V

j7-2 (SIG) - Body ground

Ignition switch ON

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

17.

REPLACE AIRBAG SENSOR ASSEMBLY

(a) Connect the front seat adjuster assembly RH connector.

(b) Replace the airbag sensor assembly with a new one.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

NEXT

18.

PERFORM ZERO POINT CALIBRATION

(a) Using the GTS, perform "Occupant Detection Sensor Zero Point Calibration".

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM (for TMC Made): INITIALIZATION

NEXT

END