Toyota Venza manuals

Toyota Venza: 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.


NG

GO TO PROBLEM SYMPTOMS TABLE


OK

2.

READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream 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

-

OK:

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


NG

GO TO STEP 8


OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream 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.


NG

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY


OK

4.

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

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



NEXT

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.


OK

END (OUTER MIRROR CONTROL ECU ASSEMBLY LH WAS DEFECTIVE)


NG

6.

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

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



NEXT

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.


OK

END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)


NG

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

SET switch is not pressed

10 kΩ or higher

1 - 4

M1 switch is pressed

Below 1 Ω

M1 switch is not pressed

10 kΩ or higher

1 - 3

M2 switch is pressed

Below 1 Ω

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)


NG

REPLACE SEAT MEMORY SWITCH


OK

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


OK

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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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 communica ...

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