Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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 ECU Malfunction	Occupant detection ECU malfunction	Occupant detection ECU

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.

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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

Body Electrical > Occupant Detection > Clear DTCs

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

Click here

Body Electrical > SRS Airbag > Clear DTCs

(c) Turn the engine switch off.

(d) Turn the engine switch on (IG), and wait for at least 10 seconds.

(e) Check for DTCs.

Click here

Body Electrical > Occupant Detection > Trouble Codes

OK:

DTC B1795 is not output.

HINT:

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

(f) Turn the engine switch off.

OK

USE SIMULATION METHOD TO CHECK

NG

2.	REPLACE OCCUPANT DETECTION ECU

(a) Turn the engine switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

(c) Replace the occupant detection ECU.

Click here

(d) Connect the cable to the negative (-) battery terminal.

NEXT

3.	PERFORM ZERO POINT CALIBRATION

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

Click here

Body Electrical > Occupant Detection > Utility

Tester Display
Zero Point Calibration

NEXT

END