Last Modified: 11-29-2007 1.6 J
Service Category: Vehicle Interior Section: Seat
Model Year: 2008 Model: Sequoia Doc ID: RM000001R7T00BX
Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): DESCRIPTION (2008 Sequoia)

One or more Power Seat Motors do not Operate

DESCRIPTION

When the front power seat switch is operated, a command signal is sent to the position control ECU. The position control ECU then controls the appropriate seat motor as needed. The position control ECU is designed so that a malfunction of the seat memory system will not interfere with manual seat control.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (FRONT POWER SEAT 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 / Driver seat / Data List.

(e) According to the display on the Techstream, read the Data List.

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

OK

2.

PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR)

(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 / Active Test.

(e) According to the display on the Techstream, perform the Active Test.

Driver Seat

Tester Display

Test Part

Control Range

Diagnostic Note

Seat Reclining

Seat reclining operation

Front/OFF/Rear

-

Front Vertical Operation

Seat front vertical operation

Up/OFF/Down

-

Lifter Operation

Seat lifter operation

Up/OFF/Down

-

Seat Slide Operation

Seat sliding operation

Front/OFF/Rear

-

OK:

The power seat motors operate normally.

OK

3.

INSPECT FRONT SEAT ASSEMBLY LH (POWER SEAT MOTOR)

(a) Remove the front seat assembly LH SEAT: FRONT SEAT ASSEMBLY (for Power Seat): REMOVAL (2008 Sequoia) .

(b) Check operation of the sliding motor.

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

OK:

Measurement Condition

Specified Condition

Battery positive (+) → 1

Battery negative (-) → 2

Forward

Battery positive (+) → 2

Battery negative (-) → 1

Rearward

(c) 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:

Measurement Condition

Specified Condition

Battery positive (+) → 2

Battery negative (-) → 1

Forward

Battery positive (+) → 1

Battery negative (-) → 2

Rearward

(d) 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:

Measurement Condition

Specified Condition

Battery positive (+) → 1

Battery negative (-) → 2

Upward

Battery positive (+) → 2

Battery negative (-) → 1

Downward

(e) 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:

Measurement Condition

Specified Condition

Battery positive (+) → 2

Battery negative (-) → 1

Upward

Battery positive (+) → 1

Battery negative (-) → 2

Downward
OK

4.

CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR)

(a) Disconnect the X10 switch connector.

(b) Disconnect the X5, X6, X7 and X8 motor connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

X10-2 (SLD+) - X5-1

Always

Below 1 Ω

X10-2 (SLD+) or X5-1 - Body ground

Always

10 kΩ or higher

X10-3 (SLD-) - X5-2

Always

Below 1 Ω

X10-3 (SLD-) or X5-2 - Body ground

Always

10 kΩ or higher

X10-4 (FRV-) - X6-2

Always

Below 1 Ω

X10-4 (FRV-) or X6-2 - Body ground

Always

10 kΩ or higher

X10-6 (FRV+) - X6-1

Always

Below 1 Ω

X10-6 (FRV+) or X6-1 - Body ground

Always

10 kΩ or higher

X10-7 (LFT+) - X7-2

Always

Below 1 Ω

X10-7 (LFT+) or X7-2 - Body ground

Always

10 kΩ or higher

X10-8 (RCL+) - X8-2

Always

Below 1 Ω

X10-8 (RCL+) or X8-2 - Body ground

Always

10 kΩ or higher

X10-9 (LFT-) - X7-1

Always

Below 1 Ω

X10-9 (LFT-) or X7-1 - Body ground

Always

10 kΩ or higher

X10-10 (RCL-) - X8-1

Always

Below 1 Ω

X10-10 (RCL-) or X8-1 - Body ground

Always

10 kΩ or higher
OK