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DI-598
DIAGNOSTICS - CRUISE CONTROL SYSTEM
DI08X-24
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc.. When terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
Ignition Cruise Control ECU
Driver Side J/B No.1 Switch Driver Side J/B No.1
1 1 AM1 2 2 1 ECU-IG 9 9
W-L B-Y B-O
1B 1K 1K 1J C15 B
2 AM1 IG1 4
W
Engine Room J/B No.2
2 2
2L 2D J/B No.3
10 10 16
W-B W-B
3C 3B C15 GND
W
FL BLOCK
1 ALT INP 4
F8 F8
B-L
FL MAIN
Battery
IG
I13177
2001 SIENNA (RM787U)
Author : Date : 752
DI-599
DIAGNOSTICS - CRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check ECU-IG fuse.
Instrument Panel Junction Block No.1 PREPARATION:
Remove the ECU-IG fuse from instrument panel junction block
No.1.
CHECK:
Check continuity of ECU-IG fuse.
OK:
ECU-IG Continuity
I03208
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:
ON (a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
GND B
Measure voltage between terminals B and GND of ECU con-
nector.
OK:
10 - 14 V
(-) (+)
AB0119
I00147
I00176
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-572 ).
NG
2001 SIENNA (RM787U)
Author : Date : 753
DI-600
DIAGNOSTICS - CRUISE CONTROL SYSTEM
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
GND
I00140
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween cruise control ECU and battery (See
page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 754
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