TOYOTA PRIUS 2001 Service Repair Manual

I15488
5
8
1
2
11
8
8 A
E DA
AA
AB9
DBKL
IJ1
J22
J23 IJ1J24 J24
2D 2K
IDJ11
J/CG±O
W±B
W±B W±BW±B
W±B W±BG±O
G±O B20
Buckle SW LH
Instrument Panel J/BJ29
J/CBody ECU
J/C
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±721
2001 PRIUS (RM778U)
Driver Buckle Switch Circuit
CIRCUIT DESCRIPTION
When the buckle switch of the driver's seat is ON with the ignition switch ON, the body ECU sends a signal
to make the seat belt warning light for the driver's seat light up and to sound a buzzer.
When the buckle switch of the passenger seat is ON and the passenger seat belt occupant detecting sensor
is ON with the ignition switch ON, the body ECU sends a signal to make the seat belt warning light for the
passenger seat light up.
WIRING DIAGRAM
DI6R2±04

DI±722
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check buckle switch (See page DI±716).
NG Replace the buckle switch.
OK
2 Check wire harness and connector between buckle switch and body ground
(See page IN±41).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI±683).

I15487
Body ECU
PBKL 3
9
3
1
10
88B9 IJ1
J24
J25 IJ1
2K2DW±B W±BW±BW±BP±L
P±L
W±B
J11
J/C
IDAAA
Instrument
Panel J/B B21
Buckle SW RH and
Seat Belt Warning
Occupant Detection SW
J/C
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±723
2001 PRIUS (RM778U)
Passenger buckle switch and seat belt warning occupant detec-
tion sensor
CIRCUIT DESCRIPTION
This circuit detects the conditions of the passenger buckle switch and the seat belt warning occupant detec-
tion sensor, and makes the passenger seat belt warning flash.
WIRING DIAGRAM
DI7NR±01

DI±724
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check passenger buckle switch (See page DI±718).
NG Replace the passenger buckle switch.
OK
2 Check seat belt warning occupant detection sensor (See page BE±42).
NG Replace the seat belt warning occupant detec-
tion sensor.
OK
3 Check wireharness and connector between seat belt warning occupant detection
sensor and body ECU, passenger buckle switch and seat belt warning occupant
detection sensor, passenger buckle switch and body ground.
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI±683).

I15497
1 21013Body ECU
HCTY B8
IE1
A A
AJ7
J/C
R±W
W±B R±W
J1
J/C
IEE2
Engine Hood
Courtesy SW
W±B
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±725
2001 PRIUS (RM778U)
Engine Hood Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The engine hood courtesy switch is built into the engine hood lock assembly and goes ON when the engine
hood is opened and goes OFF when the engine hood is closed.
WIRING DIAGRAM
DI7NV±01

I00298
1 (+)
2 (±)
DI±726
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check engine hood courtesy switch.
PREPARATION:
(a) Remove engine hood lock assembly.
(b) Disconnect engine hood courtesy switch connector.
CHECK:
Check continuity between terminals 1 and 2 when engine hood
lock is locked and unlocked.
OK:
Engine hood lockTester connectionSpecified condition
LOCK±No continuity
UNLOCK1 ± 2Continuity
NG Replace engine hood courtesy switch.
OK
2 Check harness and connector between body ECU and switch, switch and body
ground (See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace body ECU (See page
IN±41).

I15491
Body ECU
1414 J/C
LCTY
B8
IF1
J30D D
J30
R±W R±W
R±W
L6
Luggage
Compartment
Light SW
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±727
2001 PRIUS (RM778U)
Luggage Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The luggage courtesy switch goes on when luggage compartment door is opened and goes off when lug-
gage compartment door is closed.
WIRING DIAGRAM
DI7NW±01

DI±728
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check luggage courtesy switch (See page BE±27).
NG Replace the luggage courtesy switch.
OK
2 Check wire harness and connector between luggage courtesy switch and body
ECU (See page IN±41).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI±683).

I15494
56
18Body ECU
YB8RX
IG1 P9
Power Window
Master SW
Y MPX1
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±729
2001 PRIUS (RM778U)
Power window master switch circuit
CIRCUIT DESCRIPTION
Power window master switch circuit can be checked using DTC check. (See page DI±765)
WIRING DIAGRAM
DI2BN±05

DI±730
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check the power window master switch circuit using DTC check.
(See page DI±765)
OK Proceed to next circuit inspection shown on
problem symptom table
(See page DI±683).
OK
2 Check the power window master switch (See page BE±56).
NG Replace the power window master switch.
OK
3 Check wireharness and connector between power window master switch and
body ECU.
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptom table
(See page DI±683).