Lexus ES300 (1997 year). Manual — part 436
N21225
Cruise Control ECU
PI
O
D
D
Junction
Connector
O
IG2
5
O
4
3
R–L
D
D
Junction
Connector
R–L
Instrument Panel J/B
2
1D
1K
1
B–Y
4 IG1
AM1
Ignition Switch
2
W
Instrument Panel J/B
AM1
GAUGE
2
1K
1
1B
B–R
1
ALT
FL BLOCK
1
B–G
FL MAIN
Battery
CRUISE MAIN
Indicator Light
(in Combination Meter)
J2
C7
C10
J4
F11
F6
4
C14
2
1
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–521
673
1997 LEXUS ES300 (RM511U)
CRUISE MAIN Indicator Light Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned ON, CRUISE MAIN indicator light lights up.
WIRING DIAGRAM
DI0FD–01
AB0119
N19927
I00746
ON
PI
(–)
(+)
DI–522
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
674
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminals PI and GND of cruise control ECU connector.
PREPARATION:
Tun ignition switch ON.
CHECK:
Measure voltage between terminals PI and GND of cruise con-
trol ECU connector when main switch on and off.
OK:
Switch position
Voltage
OFF
10 – 16 V
ON
Below 1.2 V
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
NG
2
Check combination meter (See page
).
NG
Replace combination meter.
OK
Check and replace cruise control ECU
(See page
).
N21234
Cruise Control ECU
4
5
TC
O
LG–R
D
D
Junction
Connector
B
B
BR
3
A
DLC3
IK3
10
BR
11
DLC1
J2
6
J8
J1
ED
PI
C14
C14
O
J9
A
A
LG–R
3
A/D
E1
E1
TC
Junction
Connector
BR
Junction
Connector
J24
Junction
Connector
B
C
BR
D3
D1
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–523
675
1997 LEXUS ES300 (RM511U)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that DTC output is required.
WIRING DIAGRAM
INSPECTION PROCEDURE
DI0FF–01
AB0119
S−17−1
I00747
ON
TC
E1
DLC2
DI–524
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
676
1997 LEXUS ES300 (RM511U)
1
Check voltage between terminals Tc and E
1
of DLC2.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals Tc and E
1
of DLC2.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
NG
2
Check harness and connector between cruise control ECU and DLC2, DLC2 and
body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
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