Toyota Tundra. Manual — part 612

TERMINALS OF ECU

1. CHECK FRONT POWER SEAT SWITCH LH

Fig. 8: Identifying Front Power Seat Switch Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the Z9 and Z10 switch connectors.

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

FRONT POWER SEAT SWITCH LH VOLTAGE AND RESISTANCE SPECIFICATION

SYSTEM)

Front seat adjuster assembly RH

POWER SEAT SWITCH (W/O

SEAT POSITION MEMORY

SYSTEM)

Front power seat lumbar switch
(for RH)

FRONT POWER SEAT

LUMBAR SWITCH (FOR

POWER SEAT)

Harness and connector

-

Power Seat Position is not
Memorized

Front power seat switch LH

POWER SEAT SWITCH (W/O

SEAT POSITION MEMORY

SYSTEM)

Seat memory switch

SEAT MEMORY SWITCH (W/

SEAT POSITION MEMORY

SYSTEM)

Outer mirror control ECU

TERMINALS OF ECU

Harness and connector

-

Power Seat does not Return to
Memorized Position

Front power seat switch LH

POWER SEAT SWITCH (W/O

SEAT POSITION MEMORY

SYSTEM)

Terminal No.

(Symbols)

Wiring Color

Terminal Description Condition

Specified

Condition

Z9-1 (GND) - Body

ground

W-B - Body

ground

Ground

Always

Below 1 ohms

Z9-5 (+B) - Z9-1 (GND)

L - W-B

Battery (ECU power

source)

Always

11 to 14 V

Z10-8 (SYSB) - Z9-1

Battery (ECU power

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Seat - Tundra

If the result is not as specified, there may be a malfunction on the wire harness side.

c. Reconnect the Z9 and Z10 switch connectors.

d. Measure the voltage according to the value(s) in the table below.

FRONT POWER SEAT SWITCH LH VOLTAGE SPECIFICATION

If the result is not as specified, the ECU may have a malfunction.

2. CHECK OUTER MIRROR CONTROL ECU

(GND)

R - W-B

source)

Always

11 to 14 V

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified

Condition

Z9-2 (SLD+) -

Z9-1 (GND)

P - W-B

Sliding motor signal

(forward)

Seat moving forward using

sliding switch

11 to 14 V

Other

Below 1 V

Z9-3 (SLD-) -

Z9-1 (GND)

R - W-B

Sliding motor signal

(rearward)

Seat moving rearward using

sliding switch

11 to 14 V

Other

Below 1 V

Z9-6 (FRV+) -

Z9-1 (GND)

LG - W-B

Front vertical motor

signal (upward)

Seat cushion front portion

rising using front vertical

switch

11 to 14 V

Other

Below 1 V

Z9-4 (FRV-) -

Z9-1 (GND)

W - W-B

Front vertical motor

signal (downward)

Seat cushion front portion

lowering using front vertical

switch

11 to 14 V

Other

Below 1 V

Z9-8 (RCL+) -

Z9-1 (GND)

O - W-B

Reclining motor signal

(forward)

Seatback moving forward

using reclining switch

11 to 14 V

Other

Below 1 V

Z9-10 (RCL-) -

Z9-1 (GND)

B - W-B

Reclining motor signal

(rearward)

Seatback moving rearward

using reclining switch

11 to 14 V

Other

Below 1 V

Z9-7 (LFT+) -

Z9-1 (GND)

G - W-B

Lifter motor signal

(upward)

Seat cushion rising using lifter

switch

11 to 14 V

Other

Below 1 V

Z9-9 (LFT-) -

Z9-1 (GND)

Y - W-B

Lifter motor signal

(downward)

Seat cushion lowering using

lifter switch

11 to 14 V

Other

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Seat - Tundra

Fig. 9: Identifying Outer Mirror Control ECU Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the N7 ECU connector.

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

OUTER MIRROR CONTROL ECU VOLTAGE AND RESISTANCE SPECIFICATION

If the result is not as specified, there may be a malfunction on the wire harness side.

c. Reconnect the N7 ECU connector.

d. Measure the voltage according to the value(s) in the table below.

OUTER MIRROR CONTROL ECU VOLTAGE SPECIFICATION

Terminal No.

(Symbols)

Wiring Color Terminal Description

Condition

Specified

Condition

N7-9 (GND) - Body

ground

W-B - Body

ground

Ground

Always

Below 1 ohms

N7-3 (B) - N7-9

(GND)

R - W-B

Battery (ECU power

source)

Always

11 to 14 V

N7-4 (ACC) - N7-9

(GND)

Y - W-B

Ignition power supply

Ignition switch

OFF

Below 1 V

Ignition switch

ON

11 to 14 V

Terminal No.

(Symbols)

Wiring

Color

Terminal

Description

Condition

Specified

Condition

N8-8 (M1) - N8-10

(MSWE)

P - V

Memory 1 switch

signal

Memory 1 switch

OFF

11 to 14 V

Memory 1 switch

ON

Below 1 V

N8-7 (M2) - N8-10

(MSWE)

O - V

Memory 2 switch

signal

Memory 2 switch

OFF

11 to 14 V

Memory 2 switch

ON

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Seat - Tundra

If the result is not as specified, the ECU may have a malfunction.

FRONT POWER SEAT DOES NOT OPERATE WITH FRONT POWER SEAT SWITCH

DESCRIPTION

When the front power seat switch is operated, a signal is sent to the front seat adjuster, which then operates each
motor. When 2 or more signals are input to the front seat adjuster, the motors only operate when the signals are
from the slide switch and reclining switch.

WIRING DIAGRAM

N8-9 (MM) - N8-10

(MSWE)

L - V

Memory SET switch

signal

Memory SET switch

OFF

11 to 14 V

Memory SET switch

ON

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Seat - Tundra