Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Occupant Classification ECU Malfunction (B1795)

DESCRIPTION

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

CAUTION / NOTICE / HINT

NOTICE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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

(a) Turn the power switch on (IG), and wait for at least 60 seconds.

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

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

(d) Turn the power switch off.

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

(f) Check for DTCs.

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.

(g) Turn the power switch off.

OK

USE SIMULATION METHOD TO CHECK

NG

(a) Turn the power switch off.

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

(c) Replace the occupant detection ECU with a new one.

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

NEXT

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

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NEXT

END