Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001HIBL
Model Year Start: 2019 Model: RAV4 Prod Date Range: [02/2019 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: B1795; Occupant Classification ECU Malfunction; 2019 - 2024 MY RAV4 RAV4 HV [02/2019 -        ]

DTC

B1795

Occupant Classification ECU Malfunction

DESCRIPTION

DTC B1795 is stored when a malfunction is detected in the occupant detection ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1795

Occupant Classification ECU Malfunction

  • Occupant detection ECU malfunction
  • Front occupant classification system LH malfunction
  • Rear occupant classification system LH malfunction
  • Occupant detection ECU
  • Front seat adjuster assembly RH

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 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • 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 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY RAV4 RAV4 HV [10/2019 - 06/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY RAV4 RAV4 HV [06/2020 - 08/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 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

HINT:

When DTC B1650 is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1795 is output, perform troubleshooting for this DTC first.

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs stored in the occupant detection ECU.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR

Body Electrical > Occupant Detection > Clear DTCs

(b) Clear the DTCs stored in the airbag ECU assembly.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Clear DTCs

(c) Turn the ignition switch off.

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

(e) Check the DTCs stored in the occupant detection ECU.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR

Body Electrical > Occupant Detection > Trouble Codes

HINT:

Codes other than DTC B1795 may be output at this time, but they are not related to this check.

DTC B1795 is not output.

USE SIMULATION METHOD TO CHECK

DTC B1795 is output.

2.

REPLACE OCCUPANT DETECTION ECU

(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 occupant detection ECU with a new one.

Click here 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION ECU: REMOVAL 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION ECU: REMOVAL 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION ECU: REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION ECU: REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION ECU: REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION ECU: REMOVAL

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

NEXT

3.

PERFORM ZERO POINT CALIBRATION

(a) Using the Techstream, perform "Zero Point Calibration".

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION

Body Electrical > Occupant Detection > Utility

Tester Display

Zero Point Calibration

NEXT

4.

CHECK DTC

(a) Clear the DTCs stored in the occupant detection ECU.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR

Body Electrical > Occupant Detection > Clear DTCs

(b) Clear the DTCs stored in the airbag ECU assembly.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Clear DTCs

(c) Turn the ignition switch off.

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

(e) Check the DTCs stored in the occupant detection ECU.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR

Body Electrical > Occupant Detection > Trouble Codes

HINT:

Codes other than DTC B1795 may be output at this time, but they are not related to this check.

DTC B1795 is not output.

END (OCCUPANT DETECTION ECU WAS DEFECTIVE)

DTC B1795 is output.

5.

REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH

(a) Turn the ignition switch off.

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

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

Click here 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]; SEAT: FRONT SEAT ASSEMBLY (for Manual Seat): DISASSEMBLY 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SEAT: FRONT SEAT ASSEMBLY (for Manual Seat): DISASSEMBLY

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

NEXT

6.

PERFORM ZERO POINT CALIBRATION

(a) Using the Techstream, perform "Zero Point Calibration".

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION

Body Electrical > Occupant Detection > Utility

Tester Display

Zero Point Calibration

NEXT

END (FRONT SEAT ADJUSTER ASSEMBLY RH WAS DEFECTIVE)