Toyota Venza: Power Seat Position is not Memorized

Toyota Venza Service Manual / Seat / Front Power Seat Control System(w/ Memory) / Power Seat Position is not Memorized

DESCRIPTION

The main body ECU (driver side junction block assembly) receives seat memory switch signals from the outer mirror control ECU assembly LH via CAN communication. If the seat memory SET switch is being pressed when one of the M1 or M2 switches is pressed, or if one of the M1 or M2 switches is pressed within 3 seconds of pressing the seat memory SET switch, the main body ECU (driver side junction block assembly) sends a memory request signal to the position control ECU and switch assembly. After receiving the request signal, the position control ECU and switch assembly memorizes the location data of each motor.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The seat position will not be recorded if the SET switch and 2 of the seat memory switches are pressed simultaneously.
If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.
The front power seat control system (w/ Memory) uses the CAN communication system. First, confirm that there is no malfunction in the communication system by checking communication function of the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure (See page ).

PROCEDURE

1.	CHECK FRONT POWER SEAT CONTROL SYSTEM

(a) Check that each function of the power seat operates normally by using the position control ECU and switch assembly (See page ).

OK:

Each function of the power seat operates normally using the position control ECU and switch assembly.

GO TO PROBLEM SYMPTOMS TABLE

2.	READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Mirror L / Data List

(e) Read the Data List according to the display on the Techstream.

Mirror L

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Seat Memory Switch1	M1 switch / ON or OFF	ON: M1 switch on OFF: M1 switch off	-
Seat Memory Switch2	M2 switch / ON or OFF	ON: M2 switch on OFF: M2 switch off	-
Seat Memory Set SW	SET switch / ON or OFF	ON: SET switch on OFF: SET switch off	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Seat Memory Switch1

M1 switch / ON or OFF

ON: M1 switch on

OFF: M1 switch off

Seat Memory Switch2

M2 switch / ON or OFF

ON: M2 switch on

OFF: M2 switch off

Seat Memory Set SW

SET switch / ON or OFF

ON: SET switch on

OFF: SET switch off

OK:

ON or OFF is displayed on the Techstream according to the table above.

GO TO STEP 8

3.	PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Driver Seat / Data List.

(e) Read the Data List according to the display on the Techstream.

Driver Seat

Tester Display	Test Part	Control Range	Diagnostic Note
Buzzer	Buzzer operation	OFF/ON	-

OK:

Buzzer sounds normally.

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

4.	REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

(a) Replace the outer mirror control ECU assembly LH (See page ).

5.	CHECK SEAT POSITION MEMORY FUNCTION

(a) Store a seat position in memory and check that the buzzer sounds to indicate that a position has been stored (See page ).

NOTICE:

The seat position will not be recorded if the SET switch and 2 of the seat memory switches are pressed simultaneously.
If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

OK:

Seat position memory function operates normally.

END (OUTER MIRROR CONTROL ECU ASSEMBLY LH WAS DEFECTIVE)

6.	REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

(a) Replace the position control ECU and switch assembly (See page ).

7.	CHECK SEAT POSITION MEMORY FUNCTION

(a) Store a seat position in memory and check that the buzzer sounds to indicate that a position has been stored (See page ).

NOTICE:

The seat position will not be recorded if the SET switch and 2 of the seat memory switches are pressed simultaneously.
If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

OK:

Seat position memory function operates normally.

END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

8.	INSPECT SEAT MEMORY SWITCH

(a) Remove the seat memory switch (See page ).

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	SET switch is pressed	Below 1 Ω
1 - 2	SET switch is not pressed	10 kΩ or higher
1 - 4	M1 switch is pressed	Below 1 Ω
1 - 4	M1 switch is not pressed	10 kΩ or higher
1 - 3	M2 switch is pressed	Below 1 Ω
1 - 3	M2 switch is not pressed	10 kΩ or higher

Text in Illustration

*1	M1 Switch
*2	M2 Switch
*3	SET Switch
*a	Component without harness connected (Seat Memory Switch)

REPLACE SEAT MEMORY SWITCH

9.	CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH - SEAT MEMORY SWITCH)

(a) Disconnect the I13 outer mirror control ECU assembly LH connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I10-2 (MRY) - I13-1 (MM)	Always	Below 1 Ω
I10-4 (M1) - I13-2 (M1)	Always	Below 1 Ω
I10-3 (M2) - I13-3 (M2)	Always	Below 1 Ω
I10-1 (U) - I13-13 (MSWE)	Always	Below 1 Ω
I13-7 (GND) - Body ground	Always	Below 1 Ω
I13-1 (MM) - Body ground	Always	10 kΩ or higher
I13-2 (M1) - Body ground	Always	10 kΩ or higher
I13-3 (M2) - Body ground	Always	10 kΩ or higher
I13-13 (MSWE) - Body ground	Always	10 kΩ or higher

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

REPAIR OR REPLACE HARNESS OR CONNECTOR

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