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.

(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.

GO TO STEP 5

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.

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

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

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))

(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))

REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY LH

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

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

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

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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