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05-2038
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM 05BEL-02
CRUISE CONTROL SWITCH CIRCUIT
CIRCUIT DESCRIPTION
This circuit carries the -/SET, +/RES, MODE and CANCEL signals (each voltage) to the ECM.
The mode switch on cruise control main switch changes the vehicle-to-vehicle mode to constant speed con-
trol mode.
WIRING DIAGRAM
ECM Distance Control ECU
11 J/C 28 16
W W
J4 J3 D2 MODE
C13
Combination SW
J20
Distance Control Switch
J/C
W G B B BR BR
2 DIST Distance ECC 4 96 76
28 2
P P R
CCHG E6 II2
3 R/N
J19 B
Cruise Control
24 J/C
B W-B Main Switch
E5 B
CCS 89 49 3 2 1 8 II3
5 CCS
CCS R/N ECC
BR
MODE
A
J29
ON - OFF J/C
A
+RES
BR
-SET
EB
CANCEL
I34884
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2221
05-2039
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 INSPECT CRUISE CONTROL MAIN SWITCH
(a) Disconnect the cruise control main switch connector.
(b) Measure the resistance between terminal 1 and 3 of the
+/RES cruise control main switch connector when the cruise con-
MODE
trol main switch is operated.
ONOFF
Standard:
Switch position Resistance ()
Neutral 10 k or higher
-/SET
+/RES 210 to 270
CANCEL
-/SET 560 to 700
CANCEL 1,380 to 1,700
(c) Check continuity between terminals 1 and 3 of cruise con-
trol main switch connector when the main switch is held
on and off.
Standard:
Switch position Tester connection Specification
OFF 1-3 10 k or higher
ON 1-3 Below 1
I34904 (d) Check continuity between terminals 1 and 2 of cruise con-
trol main switch connector when the mode switch is oper-
ated.
Standard:
Switch position Tester connection Specification
MODE 1-2 Below 1
NG REPLACE CRUISE CONTROL MAIN SWITCH
OK
2 CHECK WIRE HARNESS AND CONNECTOR(CRUISE CONTROL MAIN SWITCH -
ECM)
(a) Check for an open or short circuit in harness and connector between cruise control main switch and
ECM (See page 01-37 ).
NG REPAIR OR REPLACE WIRE HARNESS OR
CONNECTOR
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2222
05-2040
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
3 CHECK WIRE HARNESS AND CONNECTOR(CRUISE CONTROL MAIN SWITCH -
BODY GROUND)
(a) Check for an open or short circuit in harness and connector between cruise control main switch and
body ground (See page 01-37 ).
NG REPAIR OR REPLACE WIRE HARNESS OR
CONNECTOR
OK
4 INSPECT ECM
(a) Remove the ECM with connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage between terminal CCS (E5-24) of
E5 ECM and body ground, when cruise main switch is oper-
ated.
Standard:
Switch position Voltage
CCS Neutral 10 to 16 V
I34219
CANCEL 6.6 to 10.1 V
-/SET 4.5 to 7.1 V
+/RES 2.3 to 4.0 V
Main switch ON Below 1 V
(d) Measure the voltage between terminal CCHG (E6-28) of
ECM and body ground, when cruise control main switch
is operated.
E6 Standard:
Switch position Voltage
MODE Below 1 V
Neutral 10 to 14 V
CCHG
I34219
NG REPLACE ECM (See page 10-17 )
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
(See page 05-2008 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2223
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