Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001QM5C
Model Year Start: 2021 Model: RAV4 Prod Date Range: [08/2020 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1653; Driver Side Seat Position Sensor; 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]

DTC

B1653

Driver Side Seat Position Sensor

DESCRIPTION

The front seat adjuster assembly LH (seat position airbag sensor) circuit consists of the airbag ECU assembly and front seat adjuster assembly LH (seat position airbag sensor).

DTC B1653 is stored when a malfunction is detected in the front seat adjuster assembly LH (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

One of the following conditions is met:

  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the front seat adjuster assembly LH (seat position airbag sensor) circuit for 2 seconds.
  • A front seat adjuster assembly LH (seat position airbag sensor) malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Front seat inner belt assembly LH
  • Front seat adjuster assembly LH (seat position airbag sensor)
  • Airbag ECU assembly

Comes on

Not applicable

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

    Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 MY RAV4 RAV4 HV [10/2023 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 MY RAV4 RAV4 HV [10/2023 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

  • After replacing the airbag ECU assembly, refer to initialization.

    Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 MY RAV4 RAV4 HV [10/2023 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

PROCEDURE

1.

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 90 seconds.

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

Connectors are not properly connected

CONNECT CONNECTORS PROPERLY

Connectors are properly connected

2.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly and front seat adjuster assembly LH (seat position airbag sensor).

*1

Front Seat Adjuster Assembly LH (Seat Position Airbag Sensor)

*2

Airbag ECU Assembly

*3

Front Seat Inner Belt Assembly LH

*4

Floor Wire

(b) Check that the connectors (on the airbag ECU assembly side and front seat adjuster assembly LH (seat position airbag sensor) side) are not damaged.

Connectors are deformed or damaged

REPLACE FLOOR WIRE OR FRONT SEAT INNER BELT ASSEMBLY LH

Connectors are not deformed or damaged

3.

CHECK FRONT SEAT ADJUSTER ASSEMBLY LH (SEAT POSITION AIRBAG SENSOR) CIRCUIT

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

*1

Front Seat Adjuster Assembly LH (Seat Position Airbag Sensor)

*2

Airbag ECU Assembly

*3

Front Seat Inner Belt Assembly LH

*4

Floor Wire

*5

Service Wire

*a

Front view of wire harness connector

(to Front Seat Adjuster Assembly LH (Seat Position Airbag Sensor))

*b

Front view of wire harness connector

(to Airbag ECU Assembly)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

z18-1 - Body ground

Ignition switch ON

Below 1 V

z18-2 - Body ground

Ignition switch ON

Below 1 V

(d) Turn the ignition switch off.

(e) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

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

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z18-1 - z18-2

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:

Tester Connection

Condition

Specified Condition

z18-1 - z18-2

Always

1 MΩ or higher

z18-1 - Body ground

Always

1 MΩ or higher

z18-2 - Body ground

Always

1 MΩ or higher

NG

GO TO STEP 7

OK

4.

CHECK DTC

(a) Connect the connectors to the airbag ECU assembly and front seat adjuster assembly LH (seat position airbag sensor).

*1

Front Seat Adjuster Assembly LH (Seat Position Airbag Sensor)

*2

Airbag ECU Assembly

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

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

(d) Clear the DTCs in memory.

Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR

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.

Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Trouble Codes

HINT:

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

DTC B1653 is not output

USE SIMULATION METHOD TO CHECK

DTC B1653 is output

5.

REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH (SEAT POSITION AIRBAG SENSOR)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

(c) Replace the front seat adjuster assembly LH (seat position airbag sensor).

for Manual Seat:

Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SEAT: FRONT SEAT ASSEMBLY (for Manual Seat): DISASSEMBLY

for Power Seat:

Click here 2019 - 2021 MY RAV4 RAV4 HV [11/2018 - 12/2021]; SEAT: FRONT SEAT ASSEMBLY (for Power Seat): DISASSEMBLY 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; SEAT: FRONT SEAT ASSEMBLY (for Power Seat): DISASSEMBLY

HINT:

Perform the inspection using parts from a normal vehicle if possible.

NEXT

6.

CHECK DTC

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

*1

Front Seat Adjuster Assembly LH (Seat Position Airbag Sensor)

*2

Airbag ECU Assembly

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

(c) Clear the DTCs in memory.

Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Clear DTCs

(d) Turn the ignition switch off.

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

(f) Check for DTCs.

Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Trouble Codes

HINT:

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

DTC B1653 is not output

END (FRONT SEAT ADJUSTER ASSEMBLY LH [SEAT POSITION AIRBAG SENSOR] WAS DEFECTIVE)

DTC B1653 is output

REPLACE AIRBAG ECU ASSEMBLY 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

7.

INSPECT FRONT SEAT INNER BELT ASSEMBLY LH

(a) Remove the front seat inner belt assembly LH.

for Manual Seat:

Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): REMOVAL

for Power Seat:

Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): REMOVAL

(b) Inspect the front seat inner belt assembly LH.

for Manual Seat:

Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): INSPECTION

for Power Seat:

Click here 2019 - 2021 MY RAV4 RAV4 HV [11/2018 - 12/2021]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): INSPECTION 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): INSPECTION

OK

REPLACE FLOOR WIRE

NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

for Manual Seat:

Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Manual Seat): REMOVAL

for Power Seat:

Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY (for Power Seat): REMOVAL