Lexus ES300 (1997 year). Manual — part 420
DI0DW–01
N21275
Wireless Door Lock ECU
SHORT PIN
1W
1G
DOME
Engine Room J/B
Battery
+B
J5
J6
W–B
J16
A
GND
B
8
FL MAIN
A
R
A
A
1
12
2J
R
8
Instrument panel J/B
J/C
W–B
W8
W8
7
1
2A
R
IG
N14677
Fuse
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
DI–457
609
1997 LEXUS ES300 (RM511U)
CIRCUIT INSPECTION
ECU Power Source Circuit
CIRCUIT DESCRIPTION
Battery positive voltage is always applied the terminal +B of the wireless door lock ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check DOME fuse.
PREPARATION:
Remove DOME fuse from engine room junction block.
CHECK:
Check continuity of DOME fuse.
OK:
Below 1.0
Ω
or continuity
NG
Check for short in all the harness and compo-
nents connected to DOME fuse.
(See attached wiring diagram.)
OK
N22142
+B(+)
DI–458
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
610
1997 LEXUS ES300 (RM511U)
2
Check voltage between terminals +B and ECU connector.
PREPARATION:
Remove the wireless door lock ECU from No.1 instrument pan-
el brace.
CHECK:
Measure voltage between terminals +B of ECU connector.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
3
Check for open in harness and connector between terminal GND of ECU and
body ground (See page
NG
Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween ECU and battery.
N21274
Instrument Panel J/B
Ignition Switch
Wireless Door Lock ECU
AM1
J6
W8
F11
Battery
B–Y
B–R
1D
1K
ECU–IG
FL MAIN
AL
T
Instrument Panel J/B
F6
J6
B–R
B–R
B
B
4
2
W
1K
1B
1
2
13 IG
1
2
N14677
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
DI–459
611
1997 LEXUS ES300 (RM511U)
Ignition Switch Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ON position, battery positive voltage is applied to the terminal IG
of the ECU. Furthermore, power supplied from the terminal IG of the ECU is used as power for the wireless
door lock buzzer.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check ECU–IG fuse.
PREPARATION:
(a)
Remove front lower panel.
(b)
Remove ECU–IG fuse from instrument panel junction
block.
CHECK:
Check continuity of ECU–IG fuse.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to ECU–IG fuse.
(See attached wiring diagram.)
OK
DI0DX–01
AB0119
N22141
I00639
IG(+)
ON
DI–460
–
DIAGNOSTICS
WIRELESS DOOR LOCK CONTROL SYSTEM
612
1997 LEXUS ES300 (RM511U)
2
Check voltage between terminal IG of ECU and body ground.
PREPARATION:
(a)
Disconnect the ECU connector.
(b)
Turn the ignition switch ON.
CHECK:
Measure voltage between terminals IG of ECU connector and
body ground.
OK:
Voltage: 10
∼
14 V
OK
Check and replace ECU.
NG
Check and repair harness and connector be-
tween ECU and battery (See page
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