Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001D0GM
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 09/2022]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMC Made Gasoline Model): B1653; Driver Side Seat Position Sensor; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]

DTC

B1653

Driver Side Seat Position Sensor

DESCRIPTION

The seat position airbag sensor circuit consists of the airbag sensor assembly and seat position airbag sensor.

DTC B1653 is stored when a malfunction is detected in the seat position airbag sensor circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B1653

Driver Side Seat Position Sensor

  • The airbag sensor assembly detects a line short, short to ground or B+, or an open in the seat position airbag sensor circuit.
  • Seat position airbag sensor malfunction
  • Airbag sensor assembly malfunction

for Manual Seat:

  • Floor wire
  • Front seat inner belt assembly LH
  • Seat position airbag sensor
  • Airbag sensor assembly

for Power Seat:

  • Floor wire
  • Front seat No. 2 wire LH
  • Front seat inner belt assembly LH
  • Seat position airbag sensor
  • Airbag sensor assembly

Comes on

Does not apply to test/check mode

WIRING DIAGRAM

for Manual Seat:
for Power Seat:

CAUTION / NOTICE / HINT

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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PROCEDURE

1.

CHECK VEHICLE CONDITION

(a) Choose the model to be inspected.

Result

Proceed to

for Manual Seat

A

for Power Seat

B

B

GO TO STEP 8

A

2.

CHECK CONNECTION OF CONNECTORS

(a) Turn the engine switch off.

(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 airbag sensor assembly and seat position airbag sensor.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

3.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly and seat position airbag sensor.

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

OK:

The terminals are not deformed or damaged.

NG

REPLACE FLOOR WIRE OR FRONT SEAT INNER BELT ASSEMBLY LH

OK

4.

CHECK WIRE HARNESS

(a) Connect the connectors to the front seat inner belt assembly LH and floor wire.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

*4

Floor Wire

*5

Service Wire

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Seat Position Airbag Sensor)

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

(c) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z20-2 (VS) - Body ground

Engine switch on (IG)

Below 1 V

z20-1 (GND) - Body ground

Engine switch on (IG)

Below 1 V

(e) Turn the engine switch off.

(f) 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.

(g) Using a service wire, connect terminals 25 (LSP+) and 26 (LSP-) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z20-2 (VS) - z20-1 (GND)

Always

Below 1 Ω

(i) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z20-2 (VS) - z20-1 (GND)

Always

1 MΩ or higher

z20-2 (VS) - Body ground

Always

1 MΩ or higher

z20-1 (GND) - Body ground

Always

1 MΩ or higher

NG

GO TO STEP 7

OK

5.

CHECK DTC

(a) Connect the connectors to the airbag sensor assembly and seat position airbag sensor.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

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

(c) Turn the engine switch on (IG), and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the engine switch off.

(f) Turn the engine switch on (IG), and wait for at least 60 seconds.

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1653 is not output.

HINT:

Codes other than DTC B1653 may be output at this time, but they are not related to this check.

OK

USE SIMULATION METHOD TO CHECK

NG

6.

CHECK SEAT POSITION AIRBAG SENSOR

(a) Turn the engine switch off.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

(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) Replace the seat position airbag sensor with a known good one.

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HINT:

Perform the following inspection using known good parts from another vehicle if possible.

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

(e) Turn the engine switch on (IG), and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the engine switch off.

(h) Turn the engine switch on (IG), and wait for at least 60 seconds.

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1653 is not output.

HINT:

Codes other than DTC B1653 may be output at this time, but they are not related to this check.

(j) Turn the engine switch off.

(k) 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.

(l) Restore the seat position airbag sensor that was installed for testing to its original location.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR (for TMC Made): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR (for TMC Made): REMOVAL

OK

REPLACE SEAT POSITION AIRBAG SENSOR 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR (for TMC Made): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR (for TMC Made): REMOVAL

NG

REPLACE AIRBAG SENSOR ASSEMBLY 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

7.

CHECK FLOOR WIRE

(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

*4

Floor Wire

*5

Service Wire

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Seat Inner Belt Assembly LH)

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

(c) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O23-4 (LSP+) - Body ground

Engine switch on (IG)

Below 1 V

O23-3 (LSP-) - Body ground

Engine switch on (IG)

Below 1 V

(e) Turn the engine switch off.

(f) 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.

(g) Using a service wire, connect terminals 25 (LSP+) and 26 (LSP-) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O23-4 (LSP+) - O23-3 (LSP-)

Always

Below 1 Ω

(i) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O23-4 (LSP+) - O23-3 (LSP-)

Always

1 MΩ or higher

O23-4 (LSP+) - Body ground

Always

1 MΩ or higher

O23-3 (LSP-) - Body ground

Always

1 MΩ or higher

OK

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL

NG

REPLACE FLOOR WIRE

8.

CHECK CONNECTION OF CONNECTORS

(a) Turn the engine switch off.

(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 airbag sensor assembly, front seat inner belt assembly LH and seat position airbag sensor.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

9.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly, front seat inner belt assembly LH and seat position airbag sensor.

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

OK:

The terminals are not deformed or damaged.

NG

REPLACE FLOOR WIRE, FRONT SEAT NO. 2 WIRE LH OR FRONT SEAT INNER BELT ASSEMBLY LH

OK

10.

CHECK WIRE HARNESS

(a) Connect the floor wire and front seat No. 2 wire LH to the front seat inner belt assembly LH.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

*4

Front Seat No. 2 Wire LH

*5

Floor Wire

*6

Service Wire

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Seat Position Airbag Sensor)

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

(c) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

q10-2 (VS) - Body ground

Engine switch on (IG)

Below 1 V

q10-1 (GND) - Body ground

Engine switch on (IG)

Below 1 V

(e) Turn the engine switch off.

(f) 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.

(g) Using a service wire, connect terminals 25 (LSP+) and 26 (LSP-) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q10-2 (VS) - q10-1 (GND)

Always

Below 1 Ω

(i) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q10-2 (VS) - q10-1 (GND)

Always

1 MΩ or higher

q10-2 (VS) - Body ground

Always

1 MΩ or higher

q10-1 (GND) - Body ground

Always

1 MΩ or higher

NG

GO TO STEP 13

OK

11.

CHECK DTC

(a) Connect the connectors to the airbag sensor assembly and seat position airbag sensor.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

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

(c) Turn the engine switch on (IG), and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the engine switch off.

(f) Turn the engine switch on (IG), and wait for at least 60 seconds.

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1653 is not output.

HINT:

Codes other than DTC B1653 may be output at this time, but they are not related to this check.

OK

USE SIMULATION METHOD TO CHECK

NG

12.

CHECK SEAT POSITION AIRBAG SENSOR

(a) Turn the engine switch off.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

(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) Replace the seat position airbag sensor with a known good one.

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HINT:

Perform the following inspection using known good parts from another vehicle if possible.

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

(e) Turn the engine switch on (IG), and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the engine switch off.

(h) Turn the engine switch on (IG), and wait for at least 60 seconds.

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1653 is not output.

HINT:

Codes other than DTC B1653 may be output at this time, but they are not related to this check.

(j) Turn the engine switch off.

(k) 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.

(l) Restore the seat position airbag sensor that was installed for testing to its original location.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR (for TMC Made): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR (for TMC Made): REMOVAL

OK

REPLACE SEAT POSITION AIRBAG SENSOR 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR (for TMC Made): REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR (for TMC Made): REMOVAL

NG

REPLACE AIRBAG SENSOR ASSEMBLY 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

13.

CHECK WIRE HARNESS

(a) Disconnect the front seat No. 2 wire LH connector from the front seat inner belt assembly LH.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

*4

Front Seat No. 2 Wire LH

*5

Floor Wire

*6

Service Wire

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Seat No. 2 Wire LH)

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

(c) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

E-2 (LSP+) - Body ground

Engine switch on (IG)

Below 1 V

E-1 (LSP-) - Body ground

Engine switch on (IG)

Below 1 V

(e) Turn the engine switch off.

(f) 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.

(g) Using a service wire, connect terminals 25 (LSP+) and 26 (LSP-) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E-2 (LSP+) - E-1 (LSP-)

Always

Below 1 Ω

(i) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E-2 (LSP+) - E-1 (LSP-)

Always

1 MΩ or higher

E-2 (LSP+) - Body ground

Always

1 MΩ or higher

E-1 (LSP-) - Body ground

Always

1 MΩ or higher

OK

REPLACE FRONT SEAT NO. 2 WIRE LH

NG

14.

CHECK FLOOR WIRE

(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.

*1

Seat Position Airbag Sensor

*2

Front Seat Inner Belt Assembly LH

*3

Airbag Sensor Assembly

*4

Front Seat No. 2 Wire LH

*5

Floor Wire

*6

Service Wire

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Seat Inner Belt Assembly LH)

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

(c) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O23-4 (LSP+) - Body ground

Engine switch on (IG)

Below 1 V

O23-3 (LSP-) - Body ground

Engine switch on (IG)

Below 1 V

(e) Turn the engine switch off.

(f) 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.

(g) Using a service wire, connect terminals 25 (LSP+) and 26 (LSP-) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O23-4 (LSP+) - O23-3 (LSP-)

Always

Below 1 Ω

(i) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O23-4 (LSP+) - O23-3 (LSP-)

Always

1 MΩ or higher

O23-4 (LSP+) - Body ground

Always

1 MΩ or higher

O23-3 (LSP-) - Body ground

Always

1 MΩ or higher

OK

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL

NG

REPLACE FLOOR WIRE