Lexus SC300 / Lexus SC400. Service manual - part 196

Location of Connectors in Body

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

BE–457

Location of Connectors in Instrument Panel

BE–458

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

BE–459

WIRING DIAGRAM

Check DOME fuse.

NG

OK

Check for short in all the harness
and components connected to
DOME fuse.
(See attached wiring diagram)

Check voltage between terminals +B and
E of wireless door lock ECU connector.

Check for open in harness and connector
between terminal E of ECU and body
ground (See page 

IN–27

).

Check and repair harness and connector
between ECU and main switch, main
switch and battery.

Check wireless door lock main switch.

Proceed to next circuit inspec-
tion shown on matrix chart 
(See page 

BE–454

).

Repair or replace harness or
connector.

Replace wireless door lock main
switch.

NG

NG

NG

OK

OK

OK

1

2

3

4

CIRCUIT INSPECTION

ECU Power Source Circuit

      CIRCUIT DESCRIPTION

When the wireless door lock main switch is ON, battery voltage is applied to terminal +B of the
wireless door lock ECU, causing the ECU to operate.
When the wireless door lock main switch is OFF, battery voltage is not applied to terminal +B and the
ECU does not operate.

      DIAGNOSTIC CHART

BE–460

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System