Toyota Venza manuals

Toyota Venza: One or more Power Seat Motors do not Operate

Toyota Venza Service Manual / Seat / Front Power Seat Control System(w/ Memory) / One or more Power Seat Motors do not Operate

DESCRIPTION

Signals are input into the position control ECU and switch assembly. The built-in ECU manages the signals received from the position control ECU and switch assembly, and operates each motor. If the position control ECU and switch assembly receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the position control ECU and switch assembly receives 1 signal only.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(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

Measurement Item/Range

Normal Condition

Diagnostic Note

Reclining Rear

Reclining switch signal (Rearward) / ON or OFF

ON: Reclining switch (Rearward) on

OFF: Reclining switch (Rearward) off

-

Reclining Front

Reclining switch signal (Forward) / ON or OFF

ON: Reclining switch (Forward) on

OFF: Reclining switch (Forward) off

-

Front Vertical Down

Front vertical switch signal (Downward) / ON or OFF

ON: Front vertical switch (Downward) on

OFF: Front vertical switch (Downward) off

-

Front Vertical Up

Front vertical switch signal (Upward) / ON or OFF

ON: Front vertical switch (Upward) on

OFF: Front vertical switch (Upward) off

-

Lifter Switch Down

Lifter switch signal (Downward) / ON or OFF

ON: Lifter switch (Downward) on

OFF: Lifter switch (Downward) off

-

Lifter Switch Up

Lifter switch signal (Upward) / ON or OFF

ON: Lifter switch (Upward) on

OFF: Lifter switch (Upward) off

-

Slide Rear

Sliding switch signal (Rearward) / ON or OFF

ON: Sliding switch (Rearward) on

OFF: Sliding switch (Rearward) off

-

Slide Front

Sliding switch signal (Forward) / ON or OFF

ON: Sliding switch (Forward) on

OFF: Sliding switch (Forward) off

-

OK:

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


NG

GO TO STEP 5


OK

2.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Enter the following menus: Body Electrical / Driver Seat / Active Test.

(b) Perform the Active Test according to the display on the Techstream.

Driver Seat

Tester Display

Test Part

Control Range

Diagnostic Note

Seat Reclining

Seat reclining operation

OFF/Front/Rear

-

Front Vertical Operation

Seat front vertical operation

OFF/Up/Down

-

Lifter Operation

Seat lifter operation

OFF/Up/Down

-

Seat Slide Operation

Seat sliding operation

OFF/Front/Rear

-

OK:

The power seat motors operate normally.


OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY


NG

3.

INSPECT FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH

(a) Remove the front seat frame with adjuster assembly LH (See page ).



(b) Check operation of the slide motor.

(1) Check if the seat moves smoothly when the battery is connected to the slide motor connector terminals.

OK:

Condition

Specified Condition

Battery positive (+) → Terminal 3

Battery negative (-) → Terminal 4

Forward

Battery positive (+) → Terminal 4

Battery negative (-) → Terminal 3

Rearward

Text in Illustration

*a

Component without harness connected

(Slide Motor (Front Seat Frame with Adjuster Assembly LH))

(c) Check operation of the front vertical motor.

(1) Check if the seat moves smoothly when the battery is connected to the front vertical motor connector terminals.

OK:

Condition

Specified Condition

Battery positive (+) → Terminal 1

Battery negative (-) → Terminal 2

Upward

Battery positive (+) → Terminal 2

Battery negative (-) → Terminal 1

Downward

Text in Illustration

*a

Component without harness connected

(Front Vertical Motor (Front Seat Frame with Adjuster Assembly LH))


(d) Check operation of the lifter motor.

(1) Check if the seat moves smoothly when the battery is connected to the lifter motor connector terminals.

OK:

Condition

Specified Condition

Battery positive (+) → Terminal 2

Battery negative (-) → Terminal 1

Upward

Battery positive (+) → Terminal 1

Battery negative (-) → Terminal 2

Downward

Text in Illustration

*a

Component without harness connected

(Lifter Motor (Front Seat Frame with Adjuster Assembly LH))


(e) Check operation of the reclining motor.

(1) Check if the seat moves smoothly when the battery is connected to the reclining motor connector terminals.

OK:

Condition

Specified Condition

Battery positive (+) → Terminal 2

Battery negative (-) → Terminal 1

Forward

Battery positive (+) → Terminal 1

Battery negative (-) → Terminal 2

Rearward

Text in Illustration

*a

Component without harness connected

(Reclining Motor (Front Seat Frame with Adjuster Assembly LH))



NG

REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH


OK

4.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)

(a) Disconnect the T10 the position control ECU and switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T10-2 (SLD+) - T12-3 (FWD)

Always

Below 1 Ω

T10-4 (SLD-) - T12-4 (BACK)

Always

Below 1 Ω

T10-5 (FRV-) - T2-2

Always

Below 1 Ω

T10-7 (FRV+) - T2-1

Always

Below 1 Ω

T10-8 (LFT+) - T3-2

Always

Below 1 Ω

T10-11 (LFT-) - T3-1

Always

Below 1 Ω

T10-9 (RCL+) - T4-2

Always

Below 1 Ω

T10-12 (RCL-) - T4-1

Always

Below 1 Ω

T10-2 (SLD+) - Body ground

Always

10 kΩ or higher

T10-4 (SLD-) - Body ground

Always

10 kΩ or higher

T10-5 (FRV-) - Body ground

Always

10 kΩ or higher

T10-7 (FRV+) - Body ground

Always

10 kΩ or higher

T10-8 (LFT+) - Body ground

Always

10 kΩ or higher

T10-11 (LFT-) - Body ground

Always

10 kΩ or higher

T10-9 (RCL+) - Body ground

Always

10 kΩ or higher

T10-12 (RCL-) - Body ground

Always

10 kΩ or higher


OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (BATTERY - POSITION CONTROL ECU AND SWITCH ASSEMBLY - BODY GROUND)

(a) Disconnect the T11 the position control ECU and switch assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

T11-12 (SYSB) - Body ground

Always

11 to 14 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

T10-1 (GND) - Body ground

Always

Below 1 Ω


OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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