2001 TOYOTA PRIUS cruise control

I17798
A20
A12
A14
A2
A3
A1
B7
B6
B1
A9
A11
A13
A22
A21
B2
B3Conversion
Drive unit
Correspon
dence
Buzzer
Power Supply
Circuit (VFD)
ECU
Drive unit
Open door indicator
Illumination
Brake warning
Driver seat belt warning
Low oil pressure warning
Discharge warning
CRUISE main indicator
Engine coolant warning (Low)
Engine coolant warning (High)
Passenger seat belt warning
Malfunction indicator
ABS warning
SRS warning
Left turn indicator
Right turn indicator
Hi±beam indicator B5
A19
A18
A17A15 A16 A10 B4 Output control indicator BE±40
± BODY ELECTRICALCOMBINATION METER
2001 PRIUS (RM778U)

I15478
Hybrid Vehicle
Control ECU
C14
Cruise Control SW (Comb. SW)
A
W±B
5
LCCS 16
H14
CRUISE
CCS RES/
ACC
SET/
COAST
CANCEL
ECC
J17
J/C
IG A W±B
J18A
J194
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±661
2001 PRIUS (RM778U)
Cruise Control Switch Circuit
CIRCUIT DESCRIPTION
This circuit carries the SET/COAST, RESUME/ACCEL and CANCEL signal (each voltage) to the ECU.
WIRING DIAGRAM
DI7NK±01

I19096
ON
CCS
(+) (±)
DI±662
± DIAGNOSTICSCRUISE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check voltage between terminals CCS of hybrid vehicle control ECU connector
and body ground.
PREPARATION:
(a) Remove the hybrid vehicle control ECU with connector
still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals CCS of hybrid vehicle con-
trol ECU connector and body ground, when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned ON.
Switch positionVoltage (V)
Neutral10 ±16 V
RES/ACC2.4 ± 3.8 V
SET/COAST4.7 ± 6.9 V
CANCEL6.9 ± 9.8 V
NG Proceed to next circuit inspection shown in
problem symptoms table (See page DI±648).
OK

I05156
RES/ACC
CANCEL
SET/COAST
4
3
I05126
CRUISE MAIN
Switch
43
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±663
2001 PRIUS (RM778U)
2 Check control switch continuity.
PREPARATION:
(a) Remove steering wheel center pad.
(b) Disconnect the control switch connector.
CHECK:
Measure resistance between terminals 4 and 5 of control switch
connector when control switch is operated.
Switch positionResistance (W)
Neutral8 (No continuity)
RES/ACC220 ± 260
SET/COAST600 ± 660
CANCEL1,500 ± 1,600
NG Replace control switch.
OK
3 Check main switch continuity.
PREPARATION:
(a) Remove steering wheel center pad. (See page SR±6)
(b) Disconnect the control switch connector.
CHECK:
Check continuity between terminals 4 and 5 of control switch
connector when main switch is held ON and OFF.
OK:
Switch positionTester connectionSpecified condition
OFF±No continuity
Hold ON4 ± 5Continuity
NG Replace control switch.

DI±664
± DIAGNOSTICSCRUISE CONTROL SYSTEM
2001 PRIUS (RM778U)
OK
4 Check harness and connector between hybrid vehicle control ECU and cruise
control switch, cruise control switch and body ground
(See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace hybrid vehicle control
ECU (See page
IN±41).