Lexus SC300 / Lexus SC400. Manual — part 197
OK
NG
NG
OK
OK
NG
OK
NG
INSPECTION PROCEDURE
1
Check DOME fuse.
Check for short in all the harness and components con-
nected to DOME fuse (See attached wiring diagram).
2
Check voltage between terminals +B and E of ECU connector.
C
OK
P
1.
Remove the rear seat and RH quarter trim panel.
2.
Remove the ECU.
Measure voltage between terminals +B and E of ECU
connector, when wireless door lock main switch is on
and off.
Wireless door lock main switch
ON
OFF
Voltage
10 – 14 V
Below 1 V
Proceed to next circuit inspection shown on matrix chart
(See page
3
Check for open in harness and connector between terminal E of ECU and body ground
Repair or replace harness or connector.
4
Check wireless door lock main switch.
C
OK
P
1.
Remove the instrument lower finish panel.
2.
Remove wireless door lock main switch.
3.
Disconnect the connector.
Measure resistance between terminals of wireless door
lock main switch connector, when main switch is on and
off.
Wireless door lock main switch
ON
OFF
Resistance
Continuity
1M or higher
Replace wireless door lock main switch.
Check and repair harness and connector between
ECU and main switch, main switch and battery.
–
BODY ELECTRICAL SYSTEM
Wireless Door Lock Control System
BE–461
WIRING DIAGRAM
Door Unlock Detection Switch Circuit
CIRCUIT DESCRIPTION
The door unlock detection switch is built into the door lock motor assembly. The switch is OFF when the door
lock knob is in Lock position, and is ON when the knob is in Unlock position.
Furthermore, the door unlock detection switch circuit has terminal + B connected inside the theft deterrent ECU,
when the door unlock detection switch is OFF, battery positive voltage is applied to the terminal of the door un-
lock detection switch circuit of the wireless door lock ECU.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
NG
OK
Proceed to next circuit inspec-
tion shown on matrix chart (See
page
Check voltage between terminals LSWD1
LSWP and LSWD2 of ECU connector and
body ground.
Check and repair harness and connector
between ECU and door unlock detection
switch.
1
BE–462
–
BODY ELECTRICAL SYSTEM
Wireless Door Lock Control System
NG
OK
INSPECTION PROCEDURE
1
Check voltage between terminals LSWD1, LSWP and LSWD2 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 terminals LSWD1, LSWP
and LSWD2 of ECU connector and body ground, when
the respective door lock knob involved is pushed to the
lock side.
Voltage:
8 – 10 V
Proceed to next circuit inspection shown on matrix chart
(See page
Check and repair harness and connector between ECU and door unlock detection switch.
–
BODY ELECTRICAL SYSTEM
Wireless Door Lock Control System
BE–463
WIRING DIAGRAM
Door Key Lock and Unlock Switch Circuit (Unlock Side)
CIRCUIT DESCRIPTION
The door key lock and unlock switch is built into the door key cylinder. When the key is turned to the lock side,
the lock terminal of the switch is grounded, and when the key is turned to the unlock side the unlock terminal
is grounded.
Furthermore, the door key lock and unlock switch circuit has terminal +B connected inside the theft deterrent
and door lock ECU, when neither the lock or unlock terminal of the door key lock and unlock switch are grounded,
battery positive voltage is applied to the door key lock and unlock switch circuit of the wireless door lock ECU.
(Tr inside the ECU coming ON causes the wireless door lock ECU to output a signal to unlock all the doors.)
DIAGNOSTIC CHART
DIAGNOSTIC CHART
NG
OK
Proceed to next circuit inspec-
tion shown on matrix chart (See
page
Check voltage between terminal UL1 of
ECU connector and ground.
Check and repair harness and connector
between ECU and key door key lock and
unlock switch.
1
BE–464
–
BODY ELECTRICAL SYSTEM
Wireless Door Lock Control System
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