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DI-589
DIAGNOSTICS - CRUISE CONTROL SYSTEM
DI08T-24
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECU. When the ECU receives
this signal, it cancels the cruise control.
A fail-safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP
When the brake is on, battery positive voltage normally is applied through the STOP fuse and stop light
switch to terminal STP of the ECU, and the ECU turns the cruise control OFF.
If the harness connected to terminal STP has an open circuit, terminal STP will have battery positive voltage
and the cruise control will be turned OFF.
Also, when the brake is on, the magnetic clutch circuit is cut mechanically by the stop light switch, turning
the cruise control OFF. (See page DI-575 for operation of the magnetic clutch)
WIRING DIAGRAM
Cruise Control ECU
Stop Light Switch Driver Side J/B No. 1 J/B No.3
4 5 18 7 2
G-W 1R G-W G-W
1R 3B 3B C15 STP
2 1
R-B
4 IK3
3
W 8 8
G-B
C15 L
Driver Side J/B No. 1 Cruise Control R-B
STOP Actuator
7 4 3
W-R W-B
1C 1B IK3
4 3
FL BLOCK
1 INP 1 W-B
ALT J/B No.3
F8 F9
B-L 22 10
W-B
FL MAIN 3C 3C
Battery
IG
I04411
2001 SIENNA (RM787U)
Author : Date : 743
DI-590
DIAGNOSTICS - CRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light comes on when brake pedal is depressed, and turns off when brake pedal is released.
NG Check stop light system (See page BE-2 ).
OK
2 Input signal check.
CHECK:
(a) See input signal check on DI-563 .
Indicator Light
(b) Check the indicator light when the brake pedal is de-
Input Signal Blinking Pattern pressed.
SW OFF OK:
Stop Light OFF The indicator light goes off when the brake pedal is
Light
switch ON SW ON
ON depressed.
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-572 ).
NG
2001 SIENNA (RM787U)
Author : Date : 744
DI-591
DIAGNOSTICS - CRUISE CONTROL SYSTEM
3 Check voltage between terminal STP of cruise control ECU connector and body
ground.
PREPARATION:
ON
(a) Remove the ECU with connectors still connected.
(b) Turn ignition switch ON.
STP CHECK:
Measure voltage between terminal STP of cruise control ECU
connector and body ground, when the brake pedal is de-
pressed and released.
OK:
Depressed 10 - 14 V
Released Below 1 V
(-) (+)
OK Proceed to next circuit inspection shown on
AB0119 problem symptom table (See page DI-572 ).
I00142
I00173
NG
4 Check for open in harness and connectors between terminal STP of cruise con-
trol ECU and stop light switch (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 : 745
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