Lexus ES300 (1997 year). Manual — part 423
N21270
Wireless Door Lock ECU
Theft Deterrent ECU
Integration Relay
Door
Courtesy
Switch
Rear RH
R–B
IP1
1S
J35
D
4
9
1G
R–W
CTY
14
1
2
7
12
1
1
1
1
J34
J34
E
D
R–W
W8
Door
Courtesy
Switch
Front LH
Door
Courtesy
Switch
Rear LH
Door
Courtesy
Switch
Front RH
R–W
J34 D
I14
6
1S
R–W
R–G
R–G
J34
J34
J35
D
E
E
J34
E
DIODE
IP1
7
R–G
R–G
Instrument Panel J/B
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
DI–469
621
1997 LEXUS ES300 (RM511U)
Door Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The door courtesy switch comes ON when the door is opened and goes OFF when door is closed.
Furthermore. the door courtesy switch circuit has terminal +B connected inside the theft deterrent ECU
. Battery positive voltage is applied to terminal DSWD of the theft deterrent ECU when all doors are
closed, i.e., when the door courtesy switch of all doors are OFF.
WIRING DIAGRAM
DI0E9–01
N14695
CTY(+)
DI–470
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
622
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check operation of open door warning light.
CHECK:
Check that open door warning light comes on when each door is opened, and goes off when all doors are
closed.
NG
Check open door warning light circuit
OK
2
Check voltage between terminal CTY 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 CTY of wireless door lock
ECU connector and body ground, when all doors are closed.
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 courtesy
switch.
N21269
Wireless Door Lock ECU
2
3
Y–G
BZR
BZR2
W8
W8
Wireless Door Lock
Buzzer Volume
Wireless Door
Lock Buzzer
2
3
LG
IJ1
8
LG
13
2
G
IJ1
2
G
9
G
1
LG
IM3
IM3
N14880
1
2
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
DI–471
623
1997 LEXUS ES300 (RM511U)
Wireless Door Lock Buzzer Circuit
CIRCUIT DESCRIPTION
The volume of the buzzer can be controlled or turned off by the volume switch.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check wireless door lock buzzer.
PREPARATION:
Remove wireless door lock buzzer.
CHECK:
Measure resistance between terminals.
OK:
Approx. : 1 k
Ω
NG
Replace wireless door lock volume.
OK
DI0EA–01
N09960
N14881
I00641
Min.
(OFF)
30
°
Max.
2(–)
1(+)
30
°
N22171
BZR(+)
Door Lock
position
Lock
Signal
Unlock
Once
signal
0.13 sec.
0.13 sec.
0.25 sec.
Twice
signal
DI–472
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
624
1997 LEXUS ES300 (RM511U)
2
Check wireless door lock volume.
PREPARATION:
Remove wireless door lock volume.
CHECK:
Measure resistance between terminals.
OK:
OFF position:
∞ Ω
Min. position: 10 k
Ω
Max. position: 0
NG
Replace wireless door lock volume.
OK
3
Check voltage between terminal BZR 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 signal between terminal BZR and body ground, when
transmitter is ON and OFF.
OK:
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