Lexus ES300 (1997 year). Manual — part 408
N20674
N20675
I00632
E/G Room J/B No.2
Instrument Panel J/B
DOME Fuse
DOOR Fuse
N20676
E (–)
+B1 (+)
+B2 (+)
–
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI–409
561
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check DOME and DOOR fuse.
PREPARATION:
(a)
Remove DOME fuse from engine room junction block
No.2.
(b)
Remove DOOR fuse from instrument panel junction block
No.1.
CHECK:
Check continuity of DOME and DOOR fuse.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to the DOME and DOOR fuse
(See attached wiring diagram).
OK
2
Check voltage between terminals +B1, +B2 and E of theft deterrent ECU connec-
tor.
PREPARATION:
Disconnect the theft deterrent ECU connector.
CHECK:
Measure voltage between terminals +B1, +B2 and E of theft de-
terrent ECU connector.
OK:
Voltage: 10
∼
14V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
DI–410
–
DIAGNOSTICS
THEFT DETERRENT SYSTEM
562
1997 LEXUS ES300 (RM511U)
NG
3
Check for open in harness and connector between 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.
N22061
Theft Deterrent ECU
SRLY
9
T3
1
IG2
E/G Room J/B No.2
9
5
3
1
11
ST Relay
GR
W–B
W–B
2
1
3
5
40A MAIN
30A AM2
4
W–R
Instrument
Panel J/B
Instrument
Panel J/B
5 1K
1B
5
7
8
J/C
B
J8
C
J9
GR
10
IK2
GR
PNP
Switch
6
5
11 IK2
B–W
B–W
B
B
B–W
1K
1J
4
3
Ignition
Switch
ST
AR
TER
Battery
Starter
FL MAIN
3.0W
R
W–R
1
1
B–R
F6
F8
1
1
FL BLOCK
B
B
B–R
5A
2J
2L
2K
2D
2B
2A
S2
S1
–
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI–411
563
1997 LEXUS ES300 (RM511U)
Starter Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact (a) in the ECU becomes open, creating an open circuit
in terminal SRLY circuit and making the starter inoperative (starter cut).
In this condition, if one of the following operations is done, the contact (a) in the ECU is grounded, thus can-
celing the starter cut:
(1)
Unlock the front LH or RH door with key.
(2)
Unlock the doors with the wireless door lock control system.
WIRING DIAGRAM
DI01X–01
N20677
SRLY
(+)
(–)
DI–412
–
DIAGNOSTICS
THEFT DETERRENT SYSTEM
564
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
HINT:
This troubleshooting is based on the premise that engine cranking occurs.
If the engine does not crank, proceed to the engine troubleshooting on EG–Section.
1
Check voltage between terminal SRLY of theft deterrent ECU connector and
body ground.
PREPARATION:
(a)
Disconnect the theft deterrent ECU connector.
(b)
PNP switch ON (Shift to N or P position).
CHECK:
Measure voltage between terminal SRLY of theft deterrent ECU
connector and body ground, when ignition switch is turned to
ST position.
OK:
Voltage: 10
∼
14V
NG
Check and repair harness and connector be-
tween starter and theft deterrent ECU
(See page
).
OK
Check and repair theft deterrent ECU.
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