Lexus RX300 (MCU15). Manual — part 317
I07347
Instrument Panel J/B
ECU–IG
I16977
ON
GND
(–)
(+)
B
DI–500
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check ECU–IG fuse.
PREPARATION:
Remove the ECU–IG fuse from driver side 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.
OK
2
Check voltage between terminals B and GND of cruise control ECU connector.
PREPARATION:
(a)
Remove the ECU with connector still connected.
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals B and GND of ECU con-
nector.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown in
problem symptom table (See page DI–483).
I16978
GND
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–501
LEXUS RX300 (RM785E)
NG
3
Check resistance between terminal GND of cruise control ECU connector and
body ground.
CHECK:
Measure resistance between terminal GND of ECU connector
and body ground.
OK:
Resistance: Below 1 Ω
NG
Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween cruise control ECU and battery (See
page IN–32).
I19252
Cruise Control ECU
C16
5
11
4
CCS
ECC
RES/ACC
CRUISE
CANCEL
C13
Cruise Control Switch
BR
BR
SET/COAST
A
IE
L
CCS
J5
J/C
DI–502
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
LEXUS RX300 (RM785E)
Control Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
This circuit carries the SET/COAST, RESUME/ACCEL and CANCEL signals (each voltage) to the ECU.
WIRING DIAGRAM
DI08R–23
Input Signal
Indicator Light
Blinking Pattern
SET/COAST
switch
RESUME/ACCEL
switch
CANCEL switch
2 Pulses
ON
OFF
ON
OFF
3 Pulses
ON
OFF
SW OFF
SW ON
I16970
ON
CCS
(–)
(+)
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–503
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Input signal check.
PREPARATION:
See input signal check on page DI–474.
CHECK:
Check the indicator light operation when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned on.
OK:
SET/COAST, RESUME/ACCEL switch
The signals shown in the table on the left should be
output when each switch is ON. The signal should
disappear when the switch is turned OFF.
CANCEL switch
The indicator light goes off when the cancel switch is
turned ON.
OK
Wait and see.
NG
2
Check voltage between terminals CCS of cruise control ECU connector and body
ground.
PREPARATION:
(a)
Remove the ECU with connector still connected.
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals 18 of ECU connector and
body ground, when each of the SET/COAST, RESUME/AC-
CEL and CANCEL is turned ON.
Switch position
Resistance (V)
Neutral
10 – 16 V
MAIN
Below 0.5 V
RES/ACC
2.0 – 4.6 V
SET/COAST
4.0 – 7.9 V
CANCEL
6.0 – 11.0 V
NG
Proceed to next circuit inspection shown in
problem symptom table (See page DI–483).
OK
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