Toyota Tacoma (2015-2018) Service Manual: Sleep Operation Failure of Occupant Classification ECU (B1796)

Toyota Tacoma (2015-2018) Service Manual / Supplemental Restraint Systems / Occupant Classification System / Sleep Operation Failure of Occupant Classification ECU (B1796)

DESCRIPTION

During sleep mode, the occupant detection ECU monitors the condition of each sensor while the ignition switch is off. In this mode, if the occupant detection ECU detects an internal malfunction, DTC B1796 is set.

DTC No.	DTC Detections Conditions	Trouble Areas
B1796	Occupant detection ECU malfunction	Occupant detection ECU

HINT:

When DTC B1650/32 is detected as a result of troubleshooting the supplemental restraint system, perform troubleshooting for DTC B1796 of the occupant classification system.
Use the Techstream to check for DTCs of the occupant detection ECU, otherwise the DTCs cannot be read.

PROCEDURE

CHECK DTC

(a) Turn the ignition switch to the ON position.

(b) Clear any DTCs stored in the memory (See page ).

HINT:

First clear DTCs stored in the occupant detection ECU and then in the airbag sensor assembly.
Use the Techstream to clear the DTCs of the occupant detection ECU, otherwise the DTCs cannot be cleared.

(d) Turn the ignition switch to the ON position.

(e) Using the Techstream, check for DTCs of the occupant detection ECU (See page OK: ).

OK:

DTC B1796 is not output.

HINT:

DTCs other than B1796 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

2.	REPLACE OCCUPANT DETECTION ECU

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

HINT:

Perform the inspection using parts from a normal vehicle when possible.

3.	PERFORM ZERO POINT CALIBRATION

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

(b) Connect the Techstream to the DLC3.

(d) Using the Techstream, perform the zero point calibration (See page OK: ).

OK:

"Zero Point Calibration is complete." is displayed on the Techstream.

4.	PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform the sensitivity check (See page Standard : ).

Standard :

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

END

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