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05-1974
DIAGNOSTICS - CRUISE CONTROL SYSTEM 05B33-08
DTC P0571/52 BRAKE SWITCH "A" CIRCUIT
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop lamp switch assy sends a signal to the ECM. When the ECM
receives the signal, it cancels the cruise control.
A fail-safe function is provided so that it functions normally, even if there is a malfunction in the stop lamp
signal circuit.
The cancel condition occurs when battery positive voltage is supplied to terminal STP.
When the brake is on, battery positive voltage is normally applied through the STOP fuse and the stop lamp
switch assy to terminal STP of the ECM, and the ECM 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.
DTC No. DTC Detection Condition Trouble Area
The malfunction code is output when the voltage of the STP
S Stop lamp switch assy
terminal and that of the ST1- terminal on the ECM are less
P0571/52 S Stop lamp switch assy circuit
than 1 V for 0.5 sec. or more.
S ECM
WIRING DIAGRAM
S12 ECM
Stop Lamp SW J/C
2 19 12
LG-R LG-R
J3 J4 E5 ST1-
3 4 J2 J/C
20 3 19
G-W G-W G-W
J3 J4 E5 STP
2 1 A A
Driver Side J/B
16 STOP 1
W W
1C 1A
J/C I15 Ignition SW
4 18 30 IGN 27
B-O B-O B
J5 J6 1K 1H
6 IG2 AM2 5
Engine Room R/B
1 AM2 1 33 J/C 16
W W-R W-R
2D 2H J3 J4
1 2
FL Block
1
F8
FL MAIN 1 ALT 1
W W
F6 F7
Battery
I35706
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2157
05-1975
DIAGNOSTICS - CRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 INSPECT STOP LAMP SWITCH OPERATION
(a) Check that the stop lamp lights up when brake pedal is depressed and turns OFF when the brake pedal
is released.
NG INSPECT STOP LAMP SWITCH CIRCUIT (See
page 05-496 )
OK
2 INSPECT STOP LAMP SWITCH ASSY
(a) Disconnect the stop lamp switch assy connector.
2 1
(b) Measure the continuity between each terminal of the stop
lamp switch assy.
Standard:
Switch condition Tester connection Specification
4 3 Switch pin free 1-2 Continuity
Switch pin free 3-4 No continuity
Free Pushed in Switch pin pushed in 1-2 No continuity
E65594
Switch pin pushed in 3-4 Continuity
NG REPLACE STOP LAMP SWITCH ASSY
OK
3 INSPECT ECM
(a) Remove the ECM with connectors.
(b) Turn the ignition switch ON.
STP (c) Measure voltage between terminal STP of ECM connec-
tor and body ground when the brake pedal is depressed
and released.
Standard:
Pedal condition Voltage (V)
Depressed 10 to 14
I34219
Released Below 1
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2158
05-1976
DIAGNOSTICS - CRUISE CONTROL SYSTEM
(d) Measure voltage between terminal ST1- of ECM connec-
ST1- tor and body ground when the brake pedal is depressed
and released.
Standard:
Pedal condition Voltage (V)
Depressed Below 1
Released 10 to 14
I34219
NG REPLACE ECM (See page 01-37 )
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2159
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