Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Yaw Rate Sensor Module Malfunction (B1798,B1799)
DESCRIPTION
The occupant detection ECU receives signals from the acceleration sensor (airbag sensor assembly*1 or yaw rate sensor assembly*2) and skid control ECU via CAN communication.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1798 | Yaw Rate Sensor Module Malfunction | Acceleration signals are abnormal |
|
| B1799 | Vehicle Stability Control ECU Malfunction | Vehicle speed signal from skid control ECU is abnormal |
|
- *1: w/o VDIM
- *2: w/ VDIM
CAUTION / NOTICE / HINT
NOTICE:
After turning the engine 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.
Click here .gif)
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 (VEHICLE STABILITY CONTROL SYSTEM) |
(a) Check for vehicle stability control system DTCs.
Click here
OK:
DTCs are not output.
| NG | .gif) | GO TO VEHICLE STABILITY CONTROL SYSTEM |
|
.gif)
| 2. | CHECK CAN COMMUNICATION SYSTEM |
(a) Using the Techstream, check if the CAN communication system is functioning normally.
OK:
CAN communication system is functioning normally.
HINT:
Refer to CAN Bus Check in CAN Communication System.
Click here
| NG | | GO TO CAN COMMUNICATION SYSTEM |
|
| 3. | CHECK DTC (HEALTH CHECK) |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) 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 |
Occupant Classification ECU Malfunction (B1795)
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 E ...
Lost Communication with Multi-axis Acceleration Sensor Module (U0125,U0129)
DESCRIPTION The occupant detection ECU sends/receives signals to/from each ECU via CAN communication. DTC No. Detection Item DTC Detection Condition Trouble Area U0125 Lost Communicatio ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Rear Seat Assembly (for 60/40 Split Seat Type Lh Side): Inspection
INSPECTION PROCEDURE 1. PRECAUTION NOTICE: After performing the following check, initialize the fold seat control ECU (initial position reset and initial position memorization). Click here 2. INSPECT REAR SEATBACK FRAME SUB-ASSEMBLY LH (a) Check the operation of the reclining motor. (1) Apply batt ...
Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Back Door Glass: Removal
REMOVAL PROCEDURE 1. REMOVE BACK DOOR OUTSIDE GARNISH SUB-ASSEMBLY Click here 2. REMOVE REAR SPOILER Click here 3. REMOVE POWER BACK DOOR SENSOR ASSEMBLY LH Click here 4. REMOVE POWER BACK DOOR SENSOR ASSEMBLY RH HINT: Use the same procedure as for the LH side. 5. REMOVE REAR WIPER ARM AND BL ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0126