Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001HIBK
Model Year Start: 2019 Model: RAV4 Prod Date Range: [02/2019 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: B1787; Rear Occupant Classification Sensor LH Collision Detection; 2019 - 2024 MY RAV4 RAV4 HV [02/2019 -        ]

DTC

B1787

Rear Occupant Classification Sensor LH Collision Detection

DESCRIPTION

DTC B1787 is stored when the occupant detection ECU receives a collision detection signal sent by the rear occupant classification sensor LH in the case of an accident.

DTC B1787 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident did not occur.

If the vehicle was not in a collision, but the occupant detection ECU receives a collision detection signal and stores DTC B1787, the DTC can be cleared by performing zero point calibration.

Therefore, if DTC B1787 is output, first perform zero point calibration.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1787

Rear Occupant Classification Sensor LH Collision Detection

  • Rear occupant classification sensor LH sensed large load.
  • Front seat adjuster assembly RH malfunction

Front seat adjuster assembly RH (Rear occupant classification sensor LH)*

  • *: The rear occupant classification sensor LH is built into the front seat adjuster assembly RH.

CAUTION / NOTICE / HINT

CAUTION:

When this DTC is stored, repair of the malfunction indicated can only be performed by initializing the occupant detection ECU or replacing the front seat adjuster assembly RH. Do not replace the occupant detection ECU to repair the malfunction indicated by this DTC.

If the occupant detection ECU is replaced, this DTC will not be output but the occupant detection system may not function properly.

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 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

  • 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 B165A is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1787 is output, perform troubleshooting for this DTC first.

PROCEDURE

1.

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

OK:

"Zero Point Calibration is complete." is displayed.

NG

GO TO STEP 3

OK

2.

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 B1785 may be output at this time, but they are not related to this check.

DTC B1785 is not output.

END (NORMAL AFTER PERFORMING ZERO POINT CALIBRATION)

DTC B1785 is output.

3.

REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH

(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 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 (-) auxiliary battery terminal, and wait for at least 2 seconds.

NEXT

4.

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)