Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM100000001KCQD
Model Year Start: 2020 Model: Camry Prod Date Range: [09/2019 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1656; Seat Belt Buckle Switch (LH); 2020 - 2024 MY Camry [09/2019 -        ]

DTC

B1656

Seat Belt Buckle Switch (LH)

DESCRIPTION

The front seat belt buckle switch LH circuit consists of the airbag sensor assembly and front seat belt buckle switch LH (front seat inner belt assembly LH).

DTC B1656 is stored when a malfunction is detected in the front seat belt buckle switch LH circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B1656

Seat Belt Buckle Switch (LH)
  • The airbag sensor assembly detects a line short, short to ground or B+, or an open in the front seat belt buckle switch LH circuit.
  • Front seat belt buckle switch LH malfunction
  • Airbag sensor assembly malfunction
  • Floor wire
  • Front seat belt buckle switch LH (Front seat inner belt assembly LH)
  • Airbag sensor assembly

Comes on

Does not apply to test/check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition 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 CONNECTION OF CONNECTORS

(a) Turn the ignition 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 front seat inner belt assembly LH.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

2.

CHECK CONNECTORS

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

(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 FLOOR WIRE

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

*A

for Power Seat

*B

for Manual Seat

*1

Front Seat Inner Belt Assembly LH

*2

Airbag Sensor Assembly

*3

Floor Wire

*4

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) Turn the ignition switch to ON.

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

Standard Voltage:

for Power Seat:

Tester Connection

Condition

Specified Condition

R69-2 (LBE+) - Body ground

Ignition switch ON

Below 1 V

R69-1 (LBE-) - Body ground

Ignition switch ON

Below 1 V

for Manual Seat:

Tester Connection

Condition

Specified Condition

R90-2 (LBE+) - Body ground

Ignition switch ON

Below 1 V

R90-1 (LBE-) - Body ground

Ignition switch ON

Below 1 V

(d) Turn the ignition switch off.

(e) 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.

(f) Using a service wire, connect terminals 28 (LBE+) and 27 (LBE-) of connector B.

NOTICE:

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

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

Standard Resistance:

for Power Seat:

Tester Connection

Condition

Specified Condition

R69-2 (LBE+) - R69-1 (LBE-)

Always

Below 1 Ω

for Manual Seat:

Tester Connection

Condition

Specified Condition

R90-2 (LBE+) - R90-1 (LBE-)

Always

Below 1 Ω

(h) Disconnect the service wire from connector B.

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

Standard Resistance:

for Power Seat:

Tester Connection

Condition

Specified Condition

R69-2 (LBE+) - R69-1 (LBE-)

Always

1 MΩ or higher

R69-2 (LBE+) - Body ground

Always

1 MΩ or higher

R69-1 (LBE-) - Body ground

Always

1 MΩ or higher

for Manual Seat:

Tester Connection

Condition

Specified Condition

R90-2 (LBE+) - R90-1 (LBE-)

Always

1 MΩ or higher

R90-2 (LBE+) - Body ground

Always

1 MΩ or higher

R90-1 (LBE-) - Body ground

Always

1 MΩ or higher
NG

REPLACE FLOOR WIRE
OK

4.

CHECK DTC

(a) Connect the connectors to the airbag sensor assembly and front seat inner belt assembly LH.

*1

Front Seat Inner Belt Assembly LH

*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 B1656 is not output.

HINT:

Codes other than DTC B1656 may be output at this time, but they are not related to this check.

OK

USE SIMULATION METHOD TO CHECK 2020 MY Camry [09/2019 - 03/2020]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2020 MY Camry [03/2020 - 10/2020]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2021 MY Camry [10/2020 - 08/2021]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2022 - 2024 MY Camry [08/2021 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

NG

5.

CHECK FRONT SEAT INNER BELT ASSEMBLY LH

(a) Turn the ignition switch off.

*1

Front Seat Inner Belt Assembly LH

*2

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 front seat inner belt assembly LH with a known good one.

Click here 2020 MY Camry [09/2019 - 10/2020]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2021 - 2024 MY Camry [10/2020 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL

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 ignition switch to ON, and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the ignition switch off.

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

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1656 is not output.

HINT:

Codes other than DTC B1656 may be output at this time, but they are not related to this check.

(j) Turn the ignition 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 front seat inner belt assembly LH that was installed for testing to its original location.

Click here 2020 MY Camry [09/2019 - 10/2020]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2021 - 2024 MY Camry [10/2020 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL

OK

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 2020 MY Camry [09/2019 - 10/2020]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2021 - 2024 MY Camry [10/2020 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL

NG

REPLACE AIRBAG SENSOR ASSEMBLY 2020 MY Camry [09/2019 - 03/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2020 MY Camry [03/2020 - 10/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2021 - 2024 MY Camry [10/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL