Toyota 4Runner: Key-off Operation Function Operates even if Operating Conditions are not Satisfied

Toyota 4Runner Service Manual / Vehicle Exterior / Window / Glass / Power Window Control System / Key-off Operation Function Operates even if Operating Conditions are not Satisfied

DESCRIPTION

When the front doors are closed, each power window regulator motor can control its power window operation for approximately 43 seconds after the ignition switch is turned from ON to off by receiving operation permission signals from the main body ECU (instrument panel junction block). However, when approximately 43 seconds have elapsed, or a front side door is opened within approximately 43 seconds of the ignition switch being turned off, all the power window regulator motors disable manual operation.

During the auto function operation, when 43 seconds have elapsed and key-off operation is prohibited, the window operation stops immediately.

PROCEDURE

1.	CHECK LIN COMMUNICATION SYSTEM

(a) Check for LIN communication system DTCs related to the power window control system (See page ).

OK:

LIN communication system DTCs are not output.

GO TO LIN COMMUNICATION SYSTEM

2.	CHECK POWER WINDOW OPERATION FUNCTION AFTER IGNITION SWITCH OFF

(a) Check the power window operation function after the ignition switch is turned off (See page ).

Result

Result	Proceed to
Front side door is opened within 43 sec. but power windows can still operate	A
43 sec. pass and power windows can still operate	B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

3.	READ VALUE USING TECHSTREAM (FRONT DOOR COURTESY LIGHT SWITCH)

(a) Use the Data List to check if the main body ECU (multiplex network body ECU) is functioning properly (See page ).

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FL Door Courtesy SW	Front door courtesy light switch LH signal / ON or OFF	ON: Front door LH closed OFF: Front door LH open	-
FR Door Courtesy SW	Front door courtesy light switch RH signal / ON or OFF	ON: Front door RH closed OFF: Front door RH open	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FL Door Courtesy SW

Front door courtesy light switch LH signal / ON or OFF

ON: Front door LH closed

OFF: Front door LH open

FR Door Courtesy SW

Front door courtesy light switch RH signal / ON or OFF

ON: Front door RH closed

OFF: Front door RH open

OK:

On tester screen, each item changes between ON and OFF according to above chart.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

4.	CHECK FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY

(a) Open a front door and check that the map light illuminates (See page ).

OK:

Map light illuminates.

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY

5.	CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY

(a) Temporarily replace the driver side junction block with a new or normally functioning one.

(b) Check that the key-off operation function operates normally.

END (DRIVER SIDE JUNCTION BLOCK ASSEMBLY IS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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