Last Modified: 05-08-2025 6.11:8.1.0 Doc ID: RM100000001G1HP
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 02/2019]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: B1798,B1799; Yaw Rate Sensor Module Malfunction; 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

DTC

B1798

Yaw Rate Sensor Module Malfunction

DTC

B1799

Vehicle Stability Control ECU Malfunction

DESCRIPTION

The occupant detection ECU receives signals from the skid control ECU assembly via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1798

Yaw Rate Sensor Module Malfunction

Acceleration signals are abnormal
  • Airbag ECU assembly
  • CAN communication system
  • Occupant detection ECU

B1799

Vehicle Stability Control ECU Malfunction

Vehicle speed signal from skid control ECU assembly is abnormal
  • Electronically controlled brake system
  • CAN communication system
  • Occupant detection ECU

CAUTION / NOTICE / HINT

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 B1798 or B1799 is output, perform troubleshooting for this DTC first.
  • If it is difficult to perform troubleshooting (wire harness inspection), remove the front passenger seat installation bolts to see under the seat cushion.
  • In the above case, lift and hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

PROCEDURE

1.

CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check for electronically controlled brake system DTCs.

Click here 2019 - 2025 MY RAV4 RAV4 HV [11/2018 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster): DTC CHECK / CLEAR

Chassis > Brake/EPB > Trouble Codes

OK:

DTCs are not output.

NG

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

OK

2.

CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream, check if the CAN communication system is functioning normally.

HINT:

Refer to CAN Bus Check in CAN Communication System.

Click here 2019 MY RAV4 [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

OK:

CAN communication system is functioning normally.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

3.

CHECK DTC (HEALTH CHECK)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON and turn the Techstream on.

(d) Enter the following menus: System Select / Health Check.

OK:

DTCs are not output.

OK

USE SIMULATION METHOD TO CHECK

NG

GO TO OTHER DIAGNOSTIC TROUBLE CODE CHART