Lexus SC300 / Lexus SC400. Manual - part 190

NG

OK

1

2

Proceed to next circuit inspection shown on
matrix chart (See page 

BE–371

)

Check luggage compartment door opener
main switch and opener switch.

Check harness and connectors between ECU
and main switch, opener switch and body
ground (See page 

IN–27

).

Repair or replace harness or
connector.

NG

OK

Replace luggage compartment door
opener main switch and/or opener
switch.

WIRING DIAGRAM

Luggage Compartment Door Opener Main Switch and 
Opener Switch Circuit

CIRCUIT DESCRIPTION

The luggage compartment door opener main switch is off when it
is pushed in, and the luggage compartment door opener switch is
on when it is pulled.
The ECU energizes the luggage compartment door opener motor
only when the main switch and opener switch are on together.

DIAGNOSTIC CHART

DIAGNOSTIC CHART

BE–390

–

BODY ELECTRICAL SYSTEM

Door Lock Control System

OK

NG

OK

NG

INSPECTION PROCEDURE

1

Check luggage compartment door opener main switch and opener switch.

C

OK

P

OK

C

Disconnect the luggage compartment door opener
main switch and opener switch connector.

Check luggage compartment door opener main switch.
Check continuity between terminals of main switch con-
nector.

Check luggage compartment door opener switch.
Check continuity between terminals of main switch and
opener switch connector.

Replace luggage compartment door opener main switch
and or opener switch.

2

Check harness and connector between ECU and main switch, opener switch and body ground
(See page 

IN–27

).

Repair or replace harness or connector.

Proceed t next circuit inspection shown on matrix
chart (See page 

BE–371

).

–

BODY ELECTRICAL SYSTEM

Door Lock Control System

BE–391

1

2

NG

OK

Proceed to next circuit inspection shown on

matrix chart (See page 

BE–371

)

Check door open detection switch.

Check harness and connectors between ECU and
door open detection switch, door open detection

switch and body ground (See page 

IN–27

).

Repair or replace harness or
connector.

NG

OK

Replace door open detection 
switch.

WIRING DIAGRAM

Door Open Detection Switch Circuit

      CIRCUIT DESCRIPTION

The door open detection switch is built in the door lock assembly. It is on when the door is open and
off when the door is closed.

      DIAGNOSTIC CHART

BE–392

–

BODY ELECTRICAL SYSTEM

Door Lock Control System

OK

NG

OK

NG

INSPECTION PROCEDURE

1

Check door open detection switch

C

OK

P

1.

Remove the door trim and service hole cover.

2.

Disconnect door open detection switch connector.

Check continuity between terminals 3 and 6 of door
open detection switch connector, when the front door is
opened and closed.

Replace door open detection switch.

2

Check harness and connectors between ECU and door open detection switch, door open

detection switch and body ground (See page 

IN–27

).

Repair or replace harness or connector.

Proceed to next circuit inspection shown on

matric chart (See page 

BE–371

).

–

BODY ELECTRICAL SYSTEM

Door Lock Control System

BE–393