Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 ccs cidtc12
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DI-575
DIAGNOSTICS - CRUISE CONTROL SYSTEM
DI08N-23
DTC 12 Actuator Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop light switch turns on, supplying electrical power to the stop light.
Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (9 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 10 km/h (6 mph) above the set speed,
then cruise control at the set speed is resumed.
DTC No. Detection Item Trouble Area
S STOP Fuse
S Stop light switch
S Actuator magnetic clutch
Short in actuator magnetic clutch circuit.
12 S Harness or connector between cruise control ECU and
Open (0.8 sec.) in actuator magnetic clutch circuit.
actuator magnetic clutch, actuator magnetic clutch and body
ground
S Cruise control ECU
WIRING DIAGRAM
Cruise Control ECU
Cruise Control Actuator
D Actuator Magnetic Clutch Stop Light Switch
3 8 8
W-B W-B R-B R-B G-B C15 L
IK3 IK3
4 3 4 3
1 2
22 3C
J/B No.3
10 3C Stop Lights STOP Fuse
W-B
IG
I03207
2001 SIENNA (RM787U)
Author : Date : 729
DI-576
DIAGNOSTICS - CRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check STOP fuse.
Instrument Panel Junction Block No.1 PREPARATION:
(a) Turn ignition switch OFF.
(b) Remove the STOP fuse from instrument panel junction
block No.1.
CHECK:
Check fuse continuity.
STOP
OK:
Continuity exists
I03208
NG Replace STOP fuse.
OK
2 Check stop light switch.
PREPARATION:
Disconnect the stop light switch connector.
2 1
CHECK:
Check continuity between terminals.
Switch position Continuity
Switch pin free
1-2
(Brake pedal depressed)
4 3 Switch pin pushed in
3-4
I00133 (Brake pedal released)
NG Replace stop light switch.
OK
2001 SIENNA (RM787U)
Author : Date : 730
DI-577
DIAGNOSTICS - CRUISE CONTROL SYSTEM
3 Check resistance between terminals L and GND of actuator magnetic clutch.
PREPARATION:
(a) Turn ignition switch OFF.
4 (b) Disconnect the actuator connector.
CHECK:
Measure resistance between terminals 3 and 4.
OK:
Resistance: 34.65 - 42.35 .
3
I00311
NG Replace cruise control actuator.
OK
4 Check for open and short in harness and connectors between cruise control
ECU and actuator magnetic clutch, actuator magnetic clutch and body ground
(See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 731
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