Lexus ES300 (1997 year). Manual — part 421
N21273
Integration Relay
Wireless Door Lock ECU
Theft Deterrent ECU
Instrument Panel J/B
J33
J38
J37
IF3
J11
I14
J10
IO2
IG
20
IE2
J/C
F
L–R
11
W8 LSWD
W–B
IV
J10
J11
L–R
L–R
Y
L–Y
Y
L–Y
L–Y
L–Y
IP1
L–Y
IE1
W–B
W–B
W–B
IO2
W–B
W–B
B
B
J/C
F
F
F
C
C
C
C
C
A
A
2
3
11
11
Front
RH
Rear
RH
Rear
LH
W–B
W–B
20
9
9
A
A
B
B
Door
Unlock
Detection
Switch
Door
Unlock
Detection
Switch
4
4
L–R
Y
W–B
Front
LH
W–B
I14
I14
9
7
5
IF
IL
IM
BN
BR1
BR1
BQ1
BR1
BQ1
7
3
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
DI–461
613
1997 LEXUS ES300 (RM511U)
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, batter positive voltage is applied to the terminal of the
door unlock detection switch circuit of the wireless door lock ECU.
WIRING DIAGRAM
DI0E0–01
N11388
N22140
I00640
Illumination shows
Front LH
LSWD(+)
DI–462
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
614
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminals LSWD, LSWP and LSWR 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 terminals LSWD, LSWP and LSWR
of wireless door lock ECU connector and body ground, when
the respective door lock knob involved is pushed to the lock
side.
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 unlock
detection switch.
N21272
Wireless Door Lock ECU
Theft Deterrent ECU
19
UL3
IO2
W–B
IE2
Instrument panel J/B
R–G
I14
UNLOCK
LOCK
Door Key
Lock and
Unlock
Switch
W–B
W–B
W–B
W–B
R–G
R–G
UNLOCK
LOCK
IO2
IE2
L
B
IF
IL
1
2
3
20
LH
RH
J/C
J38
A
1
2
3
B
B
R–G
L
A
A
L
3
3
20
B
B
W8
7
J7
B
R–G
Integration Relay
I14
20
W–B
1G
1V
W–B
B
B
7
3
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
DI–463
615
1997 LEXUS ES300 (RM511U)
Door Key Lock and Unlock Switch Circuit (Unlock Side)
CIRCUIT DESCRIPTION
The key operated 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
ECU, when neither the lock or unlock terminal of the key lock and unlock switch are grounded, battery posi-
tive 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.)
WIRING DIAGRAM
DI0E2–01
N22139
UL2(+)
DI–464
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
616
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminals UL2 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 UL2 of wireless door lock
ECU connector and body ground.
OK:
Voltage: 10 – 14V
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.
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