Lexus SC300 / Lexus SC400. Service manual — part 198

NG

OK

INSPECTION PROCEDURE

1

Check voltage between terminal UL1 of ECU connector and body ground.

C

OK

P

1.

Remove the rear seat and RH quarter trim panel.

2.

Remove the ECU.

3.

Turn ignition switch on.

Measure voltage between terminal UL1 of ECU connec-
tor and body ground.

Voltage:

8 – 10 V

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

BE–454

).

Check and repair harness and connector between ECU and door key lock and unlock switch.

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

BE–465

WIRING DIAGRAM

Door Key Lock and Unlock Switch Circuit (Lock Side)

CIRCUIT DESCRIPTION

Refer to page

BE–464

.

Tr inside the ECU coming ON causes the wireless door lock ECU to output a signal to lock all the doors.

DIAGNOSTIC CHART

DIAGNOSTIC CHART

NG

OK

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

BE–454

).

Check voltage between terminal L1 of
ECU connector and body ground.

Check and repair harness and connector
between ECU and door key lock and un-
lock switch.

1

BE–466

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

NG

OK

INSPECTION PROCEDURE

1

Check voltage between terminal L1 of wireless door lock ECU connector and body ground.

C

OK

P

1.

Remove the rear seat and RH quarter trim panel.

2.

Remove the ECU.

3.

Turn ignition switch on.

Measure voltage between terminal L1 of ECU connec-
tor and body ground.

Voltage:

8 – 10 V

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

BE–454

).

Check and repair harness and connector between ECU and door key lock and unlock switch.

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

BE–467

WIRING DIAGRAM

Key Unlock Warning Switch Circuit

CIRCUIT DESCRIPTION

When the key is inserted in the ignition key cylinder the key unlock warning switch comes ON, and when the
key is not inserted switch is OFF.
When the key unlock warning switch is ON, the ECU operates the key confinement prevention function.

DIAGNOSTIC CHART

DIAGNOSTIC CHART

NG

OK

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

BE–454

).

Check voltage between terminal KSW of
ECU connector and body ground.

Check and repair harness and connector
between ECU and key unlock warning
switch.

1

BE–468

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System