Page 2609 of 4500
Fig. 80: Disconnecting Millimeter Wave Radar Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 2610 of 4500
Fig. 81: Disconnecting Cruise Control ECU (Distance Control ECU) Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
The cruise control main switch operates eight functions: SET, COAST, TAP-DOWN, RESUME, ACCEL,
TAP-UP, CANCEL and MODE. The SET, TAP-DOWN and COAST functions, and the RESUME, TAP-UP
and ACCEL functions are operated with the same switch. The cruise control main switch is an automatic return
type switch which turns on only while operating it in each arrow direction and turns off after releasing it. The
internal contact point of the cruise control main switch is turned on with the switch operation. The ECM then
reads the resistance value that has been changed by the switch operation to control MODE, SET, COAST,
RESUME, ACCEL and CANCEL.
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The dynamic laser cruise control system has two cruise control modes: the constant speed control mode and
vehicle-to-vehicle distance control mode.
The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic radar
cruise control system.
The operation of the constant speed control mode is the same as that for the conventional type cruise
control system.
WIRING DIAGRAM
Fig. 82: Wiring Diagram
- Cruise Control Switch Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE OF HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. Accordin
g to the display on the tester, read the "DATA LIST".
Page 2612 of 4500
Fig. 83: Identifying Cruise Control Main Switch Position
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
CC (ECM):
DATA LIST (CC (ECM))
OK: When cruise control main switch operation is performed, the standard values will be above.
Item
Measurement Item / Display
(Range)
Normal ConditionDiagnostic Note
MAI NSW
(MAIN)Main SW signal (Main CPU) /
ON or OFFON: Main SW ON (Pushed
on) OFF: Main SW OFF
(Pushed off)-
MAI NSW (SUB)Main SW signal (Sub CPU) /
ON or OFFON: Main SW ON (Pushed
on)OFF: Main SW OFF
(Pushed off)
CANCEL SWCANCEL SW signal / ON or
OFFON: CANCEL SW ON OFF:
CANCEL SW OFF-
SET/COAST SWSET/COAST SW signal / ON or
OFFON: SET/COAST SW ON
OFF: SET/COAST SW OFF-
RES/ACC SWRES/ACC SW signal / ON or
OFFON: RES/ACC SW ON
OFF: RES/ACC OFF-
Page 2613 of 4500
Result:
RESULT DETAIL
B: Go to step 2
C: REPLACE CRUISE CONTROL MAIN SWITCH ASSY (SEE REPLACEMENT
)
A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2.INSPECT CRUISE CONTROL MAIN SWITCH ASSY
a. Disconnect the cruise control main switch connector.
Fig. 84: Checking Cruise Control Main Switch Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the resistance according to the value(s) in the table below.
Standard:
CRUISE CONTROL MAIN SWITCH CONNECTOR TERMINALS RESISTANCE
OKA
NG (All items are defective)B
NG (One to four items are defective)C
Switch conditionTester connectionResistance (ohms)
NeutralA-2 - A-3, A-3 - A-410 kohms or higher
RES/ACCA-2 - A-3210 to 270
SET/COASTA-2 - A-3560 to 700
CANCELA-2 - A-31,380 to 1,700
Main Switch OFFA-2 - A-310 kohms or higher
Main Switch ONA-2 - A-3Below 1 ohms
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NG: REPLACE CRUISE CONTROL MAIN SWITCH ASSY (SEE REPLACEMENT )
OK: Go To Next Step.
3.INSPECT SPIRAL CABLE SUB-ASSY
a. Disconnect the spiral cable sub-assy connector.
b. Measure the resistance according to the value(s) in the table below.
Standard:
SPIRAL CABLE SUB-ASSY CONNECTOR TERMINALS RESISTANCE
MODEA-3 - A-4Below 1 ohms
Terminal No.Specified value
A-2 - C13-2Below 1 ohms
A-3 - C13-3Below 1 ohms
A-4 - C13-4Below 1 ohms
Page 2615 of 4500
Fig. 85: Identifying Spiral Cable Sub-Assy Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE SPIRAL CABLE SUB-ASSY (SEE REPLACEMENT
)
Page 2616 of 4500
OK: Go To Next Step.
4.CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSY - ECM)
a. Measure the resistance according to the value(s) in the table below.
Standard:
SPIRAL CABLE SUB-ASSY AND ECM TERMINALS RESISTANCE
Fig. 86: Identifying Spiral Cable Sub
-Assy Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Tester connectionConditionSpecified value
C13-2 - E2-31 (CCS)AlwaysBelow 1 ohms
C13-4 - E3-20 (CCHG)AlwaysBelow 1 ohms
C13-2 - Body groundAlways10 kohms or higher
C13-4 - Body groundAlways10 kohms or higher