Lexus RX300 (MCU15). Manual — part 320
I19255
Cruise Control ECU
PI
W–G
To
DLC3
17
1
R–W
3E
3A
J/B No.3
R–W
Instrument Panel J/B
7
1C
1K
13
B–Y
4
Ignition Switch
2
W–L
Instrument Panel J/B
AM1
HEATER
6
1
1A
W
3
Battery
CRUISE MAIN
Indicator Light
(in Combination Meter ECU)
C10
C12
5
C16
2
1
IE2
10
5
1
1C
ALT
5
W
AM1
IG1
FL BLOCK
W–G
W–G
DI–512
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
CRUISE MAIN Indicator Light Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned ON, CRUISE MAIN indicator light lights up.
WIRING DIAGRAM
DI090–36
I16979
ON
PI
(–)
(+)
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–513
LEXUS RX300 (RM785E)
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 is ON and OFF.
OK:
Switch position
Voltage
OFF
10 – 16 V
ON
Below 1.2 V
OK
Proceed to next circuit inspection shown in
problem symptom table (See page DI–483).
NG
2
Check combination meter (See page BE–68).
NG
Replace combination meter.
OK
Check and replace cruise control ECU (See
page IN–32).
I19256
Cruise Control ECU
5
10
TC
To
CRUISE MAIN
Indicator Light
J/B No. 5
3
IF
PI
C16
W–B
CG
P–B
C/C
1
C16
5B
13
4
TC
W–B
11
5B
W–G
W–G
DLC3
DI–514
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that outputs DTC.
WIRING DIAGRAM
DI091–24
N09214
AB0119
I14387
ON
Tc
CG
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–515
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check voltage between terminals Tc and CG
of DLC3.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals Tc and CG of DLC3.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown in
problem symptom table (See page DI–483).
NG
2
Check harness and connector between cruise control ECU and DLC3, DLC3 and
body ground (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN–32).
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