Toyota Sequoia (2005). Manual - part 434

I28707

Wire Harness Side:
Park/Neutral Position Switch

P1

PL

I27704

Combination Meter Wire Harness View:

C5–34

C5

I28707

Wire Harness Side:
Park/Neutral Position Switch

P1

RB

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM (w/ Driving Position 
Memory)

DI–1531

1725

4

Check harness and connector (Combination meter – park/neutral position switch
assy).

CHECK:
Measure the resistance of each terminal of the wire harness
side connectors.
OK:

Tester Connection

(Symbols)

Condition

Specified Condition

C5–34 – P1–6 (PL)

Always

Below 1 

Ω

C5–34 – Body ground

Always

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

5

Check harness and connector (Park/neutral position switch assy – battery).

CHECK:
Measure the voltage of each terminal of the wire harness side
connectors.
OK:

Tester Connection

(Symbols)

Condition

Specified Condition

P1–2 (RB) – Body ground

Ignition switch ON

10 to 14 V

NG

Repair or replace harness or connector.

OK

DI–1532

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM (w/ Driving Position 
Memory)

1726

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

DI–1508

).

I28450

MPX1

M6

1

12
B7

GR–R

1

D14
Door Courtesy Light 
Switch Front LH

GR–R

BEAN

24
B5

DCTY

J/C

J29

J30

N

G

Body ECU

Position Control
ECU & Switch

MPX2

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM (w/ Driving Position 
Memory)

DI–1533

1727

Door courtesy switch circuit

CIRCUIT DESCRIPTION

The position control ECU & switch assy detects the open/close condition of the driver’s door, via multiplex
communication, through the front door courtesy light switch.

WIRING DIAGRAM

DIDEE–01

N20159

Ohmmeter

Free

Pushed

D14

DI–1534

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM (w/ Driving Position 
Memory)

1728

INSPECTION PROCEDURE

1

Check courtesy light system.

CHECK:
Check that the door courtesy light comes on when the driver’s door is opened and goes off when it is closed.
OK:

The door courtesy light

 

operates normally.

NG

Go to courtesy light system 
(See page 

BE–40

).

OK

2

Inspect door courtesy light switch front LH.

PREPARATION:
Remove the courtesy light switch assy.
CHECK:
Measure the switch resistance.
OK:

Tester Connection

Switch Position

Specified Condition

1 – Switch body

Switch pushed

10 k

Ω

 or higher

1 – Switch body

Switch free

Below 1 

Ω

NG

Replace door courtesy light switch front LH.

OK