Toyota Sequoia (2005). Manual - part 433

I28704

Wire Harness Side:

Position Control ECU & Switch Assy

Power Seat Motor Assy

P14

P16

P15

P17

M7

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM (w/ Driving Position 
Memory)

DI–1527

1721

2

Check harness and connector (Position control ECU & switch assy – power seat
motor assy).

PREPARATION:
Disconnect the M7 ECU and P14, P15, P16 and P17 motor con-
nectors.
CHECK:
Measure the resistance of the wire harness side connectors.
OK:

Tester Connection

Specified Condition

M7–2 – P17–1

Below 1 

Ω

M7–3 – P17–2

Below 1 

Ω

M7–4 – P14–2

Below 1 

Ω

M7–6 – P14–1

Below 1 

Ω

M7–7 – P15–2

Below 1 

Ω

M7–9 – P15–1

Below 1 

Ω

M7–8 – P16–2

Below 1 

Ω

M7–10 – P16–1

Below 1 

Ω

M7–2 – Body ground

10 k

Ω

 or higher

M7–3 – Body ground

10 k

Ω

 or higher

M7–4 – Body ground

10 k

Ω

 or higher

M7–6 – Body ground

10 k

Ω

 or higher

M7–7 – Body ground

10 k

Ω

 or higher

M7–8 – Body ground

10 k

Ω

 or higher

M7–9 – Body ground

10 k

Ω

 or higher

M7–10 – Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

Proceed to next circuit inspection shown in
problem symptoms table 
(See page 

DI–1508

).

I28451

Battery

J/C

I18
Ignition SW

1

2

AM1

IG1

5

W

B

F10
FL Block

ALT

8

1L

1C

Instrument Panel J/B

7

J52

J51

2

1

AM1

6

1C

4

1

7

8

L–Y

1

MPX1

M6

W

W

C5

C5

34

30

Combination Meter

Position Control
ECU & Switch

P

L–Y

L–R

L–R

C

C

PL

RB

6

2

P1
Park/Neutral
Position Switch

B–Y

W–L

GAUGE

IPO

IG4

9

BEAN

1D

DI–1528

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM (w/ Driving Position 
Memory)

1722

Park/neutral position switch circuit

CIRCUIT DESCRIPTION

The power seat memory system operates only when the ignition switch is in the ON position and the park/
neutral position is in the P (park) position.
The position control ECU & switch assy detects the P position, via multiplex communication, through the
park/neutral position switch.

WIRING DIAGRAM

DIDEC–01

I27704

Combination Meter Wire Harness View:

C5–34

C5

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM (w/ Driving Position 
Memory)

DI–1529

1723

INSPECTION PROCEDURE

1

Check combination meter operation.

CHECK:
Check that the ”P” indicator light in the combination meter comes on when the shift lever is moved to the
P position.
OK:

The ”P” indicator light comes on.

NG

Go to combination meter system (See page

DI–1610

).

OK

2

Check harness and connector (Combination meter).

PREPARATION:
Disconnect the C5 combination meter connector.
CHECK:
Measure the voltage of each terminal of the wire harness side connectors.
OK:

Tester Connection

Condition

Specified Condition

C5–34 – Body ground

Ignition switch is in ON position and shift lever is

in P position

10 to 14 V

OK

Proceed to next circuit inspection shown in
problem symptom table (See page 

DI–1508

).

NG

I28706

Park/Neutral Position Switch Assy:

P1

RB

PL

DI–1530

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM (w/ Driving Position 
Memory)

1724

3

Inspect park/neutral position switch assy.

PREPARATION:
Disconnect the P1 switch connector.
CHECK:
Measure the resistance of each terminal of the wire harness
side connectors.
OK:

Tester Connection 

(Symbols)

Condition

Specified Condition

P1–2 (RB) – P1–6 (PL)

Shift lever is moved to 

P position

Below 1 

Ω

P1–2 (RB) – P1–6 (PL)

Shift lever is moved to any

position except P

10 k

Ω

 or higher

NG

Replace park/neutral position switch.

OK