Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM1000000015C1Y
Model Year Start: 2018 Model: Camry HV Prod Date Range: [07/2017 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1653; Driver Side Seat Position Sensor; 2018 - 2024 MY Camry HV [07/2017 -        ]

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

Comes on

Does not apply to test/check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

Click here 2018 - 2019 MY Camry HV [07/2017 - 09/2019]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION 2020 - 2024 MY Camry HV [09/2019 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

PROCEDURE

1.

CHECK CONNECTION OF CONNECTORS

(a) Turn the power switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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

2.

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 OR FRONT SEAT INNER BELT ASSEMBLY LH
OK

3.

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 (-) auxiliary battery terminal.

(c) Turn the power 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

Power switch on (IG)

Below 1 V

E-1 (LSP-) - Body ground

Power switch on (IG)

Below 1 V

(e) Turn the power switch off.

(f) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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
NG

GO TO STEP 6

OK

4.

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 (-) auxiliary battery terminal.

(c) Turn the power 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 power switch off.

(f) Turn the power 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 2018 MY Camry HV [07/2017 - 09/2018]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2019 MY Camry HV [09/2018 - 09/2019]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2020 MY Camry HV [09/2019 - 10/2020]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2021 MY Camry HV [10/2020 - 08/2021]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2022 - 2024 MY Camry HV [08/2021 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

NG

5.

CHECK SEAT POSITION AIRBAG SENSOR

(a) Turn the power 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 (-) auxiliary battery terminal.

CAUTION:

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

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

Click here 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR: REMOVAL

HINT:

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

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

(e) Turn the power 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 power switch off.

(h) Turn the power 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 power switch off.

(k) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR: REMOVAL

OK

REPLACE SEAT POSITION AIRBAG SENSOR 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SEAT POSITION SENSOR: REMOVAL

NG

REPLACE AIRBAG SENSOR ASSEMBLY 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

6.

CHECK FLOOR WIRE

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

*A

for Manual Seat

*B

for Power Seat

*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 (-) auxiliary battery terminal.

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

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

Standard Voltage:

for Manual Seat:

Tester Connection

Condition

Specified Condition

R90-4 (LSP+) - Body ground

Power switch on (IG)

Below 1 V

R90-3 (LSP-) - Body ground

Power switch on (IG)

Below 1 V

for Power Seat:

Tester Connection

Condition

Specified Condition

R69-4 (LSP+) - Body ground

Power switch on (IG)

Below 1 V

R69-3 (LSP-) - Body ground

Power switch on (IG)

Below 1 V

(e) Turn the power switch off.

(f) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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:

for Manual Seat:

Tester Connection

Condition

Specified Condition

R90-4 (LSP+) - R90-3 (LSP-)

Always

Below 1 Ω

for Power Seat:

Tester Connection

Condition

Specified Condition

R69-4 (LSP+) - R69-3 (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:

for Manual Seat:

Tester Connection

Condition

Specified Condition

R90-4 (LSP+) - R90-3 (LSP-)

Always

1 MΩ or higher

R90-4 (LSP+) - Body ground

Always

1 MΩ or higher

R90-3 (LSP-) - Body ground

Always

1 MΩ or higher

for Power Seat:

Tester Connection

Condition

Specified Condition

R69-4 (LSP+) - R69-3 (LSP-)

Always

1 MΩ or higher

R69-4 (LSP+) - Body ground

Always

1 MΩ or higher

R69-3 (LSP-) - Body ground

Always

1 MΩ or higher
OK

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 2018 - 2020 MY Camry HV [07/2017 - 10/2020]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2021 - 2024 MY Camry HV [10/2020 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL

NG

REPLACE FLOOR WIRE