Lexus ES300 (1997 year). Manual — part 422
N21271
Theft Deterrent ECU
L–W
Instrument Panel J/B
J33
Wireless Door Lock ECU
L–W
L–W
L
B
B
B
B
15
18
W8
I14
L–W
Door Key
Lock and
Unlock
Switch
UNLOCK
J36
LOCK
1G
1V
J38
IO2
IE1
W–B
W–B
W–B
W–B
W–B
RH
IE2
UNLOCK
LOCK
B
B
B
B
1
1
3
3
2
2
20
20
4
L–W
IO2
4
L–W
W–B
L–W
LH
W–B
Integration Relay
7
3
IF
IL
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
DI–465
617
1997 LEXUS ES300 (RM511U)
Door Key Lock and Unlock Switch Circuit (Lock Side)
CIRCUIT DESCRIPTION
Refer to page
.
Tr inside the wireless door lock ECU coming ON causes the theft deterrent ECU to output a signal to
lock all the doors.
WIRING DIAGRAM
DI0E5–01
N14693
L(+)
DI–466
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
618
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminal L of wireless door lock ECU connector and
body ground.
PREPARATION:
Remove the wireless door lock ECU from No.1 instrument pan-
el brace.
CHECK:
Measure voltage between terminal L of wireless door lock ECU
connector and body ground.
OK:
Voltage 10 – 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
Check and repair harness and connector between wireless door lock ECU and door key lock and
unlock switch.
N21268
Wireless Door Lock ECU
Key Unlock
Warning Switch
KSW
L–B
W–B
1M
1J
7
1
2
3
7
10
1D
J/C
W–B
Instrument
Panel J/B
W8
J11
Instrument Panel J/B
L–B
B
J10
B
J15
5
1M
L–B
IG
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
DI–467
619
1997 LEXUS ES300 (RM511U)
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 the switch is OFF.
When the key unlock warning switch is ON, the ECU operates the transmitter misoperation prevention func-
tion.
WIRING DIAGRAM
DI0E7–01
N14694
KSW(+)
DI–468
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
620
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminal KSW of wireless door lock ECU connector and
body ground.
PREPARATION:
Remove the wireless door lock ECU from No.1 instrument pan-
el brace.
CHECK:
Measure voltage between terminal KSW of wireless door lock
ECU connector and body ground, when key plate is not inserted
in the key cylinder.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
Check and repair harness and connector between wireless door lock ECU and key unlock warn-
ing switch.
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