2001 TOYOTA PRIUS battery

I15492
B8BODY ECU
HR 10
Battery10A
HORNHorn Relay
2 13 5 Engine Room J/B
C14
Horn SW
(Comb. SW)
6 1
1
1 B229
D DB±R B±R
B±R
B±W
B±R
H4
Horn F18
FL Block No. 2
120A MAINB±G
F13 F121J 1F
1BID24
J20
J/C FL Block No. 1
1IA28
B±R DI±702
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
Horn Circuit
CIRCUIT DESCRIPTION
The horn is connected to the body ECU and activated by the body ECU.
WIRING DIAGRAM
DI2A3±06

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±703
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check horn (See page DI±697).
NG Replace the horn.
OK
2 Check wireharness and connector between horn relay and body ECU, battery
and horn relay (See page IN±41).
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI±683).

I15508
Body ECU
Engine Room J/B
Instrument Panel J/B
F18 Fusible Link Block No.2
J/C
120A MAIN FL
Battery L6
Luggage
Compartment
Light SW L5
Luggage
Compartment
LightI16 Interior Light
P4 Front Personal Light7
22N1
R±B 1 2
L±Y J29E
J30DJ/C
L±Y
W±B
L±Y
L±Y
2M3
2G2
L±Y1J 715A DOME
1B2
B
W±B B BJ/C
BI 11 J30D
J29E
1
F131
F12Instrument Panel J/B
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±707
2001 PRIUS (RM778U)
Illumination circuit
CIRCUIT DESCRIPTION
Receiving the courtesy signal from either of the door ECU, the Body ECU will make the interior light, ignition
light, and foot light come on.
WIRING DIAGRAM
DI6LX±03

DI±708
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check illumination light (Interior light system)(See page BE±27).
NG Replace the failure light.
OK
2 Check wireharness and connector between each illumination light and Body
ECU, battery and each illumination light (See page IN±41).
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI±683).

DI2BM±11
I15588
P9 Power Window
Master SW
Instrument Panel J/B
J20
J/C5
1
IG CPUB
B L±Y 1
IG1
C4 W±R
R±L 3
IC1
8
IC1 L±Y L±YC
J25 B
J24 4
2D 2
2G
W±R
R±L
C
R±L 20A PWR1
5A AM1
I15 Ignition SwitchIG1 Relay
IG1 AM1
B±Y W±G11
2J
1
2H
3
2B
24
L±Y
6
2D12 3
510A GAUGE
10
2K
W
15A DOME
7
1J8
2K
Engine Room J/B
2
1BBFL Block No. 1
1
F11100A DC/DC
B±G
F18 FL Block No. 2
120A MAIN 1
F121
F13
1
Battery
ID IGA J11 J/C
W±B
J17 J/CW±B1
IC1
W±B9
E Instrument Panel J/B
AJ/C DI±740
± DIAGNOSTICSDRIVER DOOR CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT INSPECTION
Power source circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the driver door ECU.
WIRING DIAGRAM

DI±742
± DIAGNOSTICSDRIVER DOOR CONTROL SYSTEM
2001 PRIUS (RM778U)
3 Check wireharness and connector between ECU and body ground.
NG Repair or replace wireharness or connector
OK
Check and repair wireharness and connector
between ECU and battery.

I17118
2C8
IG1 RelayJ26 7.5 A ECU±B
H
R±G Instrument Panel J/B
5A ECU±IGBATT
IG
W±BGND G1
Gateway ECU
J25F
R±G
2I2 5A AM1 2C
2HJ/C
D
2 B±Y
J21
Instrument Panel J/BW±B 5
J19
J/C 3
ID1 1
B±Y 2D2
EJ19
J/C
W±B J20D E
A
AW±B
2K8
2D8
W±BA
J11
J/CID14 IG148
E7
CG J/C
A
J22
J/CAW±B 2B
2K8
2D6
D Instrument Panel J/B
5
B±YD J14
J/C
D 3 5
2 1ACC 9
GR±R GR±R
J26C
J25CJ/C
10A ACCACC Relay
3 5
2 1
I15 Ignition Switch
AM1
ACC 2
3
BatteryF18 FL Block No.2100A DC/DC1 FL Block No.1
F13 1
F11
W
J11
J/C
ID120A MAIN FL
W±B
W±B
A1B±GB±Y P±LR±G
W
W±GB±Y DI±792
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
WIRING DIAGRAM

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±793
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check ECU±B and ECU±IG fuse.
CHECK:
Check continuity of ECU±B and ECU±IG fuse.
OK:
Continuity
NG Replace the failure fuse.
OK
2 Check voltage between terminals BATT, IG and GND of body ECU connector.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the gateway ECU connector.
CHECK:
Measure voltage between terminals BATT and GND.
OK:
Voltage: 10 ± 14 V
OK Check and repair wireharness and connector
between gateway ECU and battery.
NG
3 Check wireharness and connector between gateway ECU and body ground (See
page IN±41).
NG Repair or replace wireharness or connector.
OK
Check and repair wireharness and connector
between gateway ECU and battery.