Toyota 4Runner: Sleep Operation Failure of Occupant Classification ECU (B1796)

DESCRIPTION

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

PROCEDURE

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

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

(c) Turn the ignition switch off, and wait for at least 10 seconds.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

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

OK:

DTC B1796 is not output.

HINT:

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

OK

USE SIMULATION METHOD TO CHECK

NG

(a) Turn the ignition switch off.

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

(c) Replace the occupant classification ECU (See page ).

HINT:

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

NEXT

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON, and wait for at least 60 seconds.

(c) Using the Techstream, perform the zero point calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NEXT

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

Standard range:

27 to 33 kg (59.5 to 72.8 lb)

NEXT

END