Toyota Venza: Power Seat does not Return to Memorized Position

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

DESCRIPTION

When either the M1 or M2 switch is pressed, the outer mirror control ECU assembly LH sends a switch signal to the main body ECU (driver side junction block assembly) via CAN communication. Then, the main body ECU (driver side junction block assembly) sends a recall request signal to the position control ECU and switch assembly. The position control ECU and switch assembly operates each motor to achieve each memorized position value.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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 switches on the position control ECU and switch assembly (See page ).

OK:

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

GO TO PROBLEM SYMPTOMS TABLE

2.	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 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 is normal.

GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized)

3.	CHECK SEAT POSITION RESTORING FUNCTION

(a) Under each of the following conditions, check that the seat position restoring function operates by pressing the M1 switch or M2 switch (See page ).

Ignition switch is off.
The ignition switch is ON, and the shift lever is in P.*1
The ignition switch is turned off within 180 seconds after the driver door is closed and opened.*2
The ignition switch is turned off within 60 seconds after the driver door is opened and closed.*3

Result	Proceed to
Seat position restoring function does not operate at all.	A
Seat position restoring function does not operate when the condition is *1.	B
Seat position restoring function does not operate when the condition is 2. Seat position restoring function does not operate when the condition is 3.	C

GO TO STEP 9

GO TO STEP 10

4.	READ VALUE USING TECHSTREAM (SEAT POSITION MEMORY)

(a) Store a seat position in memory for each of the M1 and M2 switches (See page ).

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

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

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

Driver Seat

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Seat Memory No1	Seat position memorized with M1 switch / Mem or Not Mem	Mem: Memorized Not Mem: Not memorized	-
Seat Memory No2	Seat position memorized with M2 switch / Mem or Not Mem	Mem: Memorized Not Mem: Not memorized	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Seat Memory No1

Seat position memorized with M1 switch / Mem or Not Mem

Mem: Memorized

Not Mem: Not memorized

Seat Memory No2

Seat position memorized with M2 switch / Mem or Not Mem

Mem: Memorized

Not Mem: Not memorized

OK:

Mem appears on the Techstream screen.

GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized)

5.	REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

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

6.	CHECK SEAT POSITION RESTORING FUNCTION

(a) Restore a memorized seat position (See page ).

(b) Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.

NOTICE:

The seat will not return to the memorized position if 2 of the seat memory switches are pressed simultaneously.
If a restoring operation has failed, release all switches. The seat memory restoring function does not operate unless the switches are released.

OK:

Seat position restoring function operates normally.

END (OUTER MIRROR CONTROL ECU ASSEMBLY LH WAS DEFECTIVE)

7.	REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

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

8.	CHECK SEAT POSITION RESTORING FUNCTION

(a) Store a seat position in memory (See page ).

(b) Restore a memorized seat position (See page ).

NOTICE:

The seat will not return to the memorized position if 2 of the seat memory switches are pressed simultaneously.
If a restoring operation has failed, release all switches. The seat memory restoring function does not operate unless the switches are released.

OK:

Seat position restoring function operates normally.

END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

9.	READ VALUE USING TECHSTREAM (PARK (P) STATE)

(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 Connection	Measurement Item/Range	Normal Condition	Diagnostic Note
P Switch	Park state signal / ON or OFF	ON: Shift lever in P OFF: Shift lever in a position other than P	-

Tester Connection

Measurement Item/Range

Normal Condition

Diagnostic Note

P Switch

Park state signal / ON or OFF

ON: Shift lever in P

OFF: Shift lever in a position other than P

OK:

On the Techstream screen, the item changes between ON and OFF according to the above.

Result	Proceed to
OK	A
NG (for 1AR-FE)	B
NG (for 2GR-FE)	C

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

GO TO SFI SYSTEM (for 1AR-FE)

GO TO SFI SYSTEM (for 2GR-FE)

10.	READ VALUE USING TECHSTREAM (DRIVER DOOR COURTESY SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

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

Main Body

Tester Connection	Measurement Item/Range	Normal Condition	Diagnostic Note
D Door Courtesy SW	Front door courtesy light switch assembly LH signal / ON or OFF	ON: Driver door open OFF: Driver door closed	-

Tester Connection

Measurement Item/Range

Normal Condition

Diagnostic Note

D Door Courtesy SW

Front door courtesy light switch assembly LH signal / ON or OFF

ON: Driver door open

OFF: Driver door closed

OK:

On the Techstream screen, the item changes between ON and OFF according to the above.

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

GO TO LIGHTING SYSTEM (Door Courtesy Switch Circuit)

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