2001 TOYOTA PRIUS instrument panel

I15479
Combination Meter
FL Block No. 1Instrument Panel J/B
to Body ECU 5A AM1IG1
Relay
3
GR±B14
C10
2A
CRUISE 8
W±B
B±G22
C10 L
2K8
2
C11
W±B I15 Ignition SW
AM1
IG1
F11
Battery
ID 10A GAUGE
5
AJ11
J/C 2 1 2B6
2B3
2D6 W
W±G
B±Y
24
B±Y
1F13
1F18
1FL Block No. 2
120A MAIN
100A DC/DC7
2A
1
2H
IH BR
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±665
2001 PRIUS (RM778U)
CRUISE MAIN Indicator Light Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned ON, CRUISE MAIN indicator light lights up.
WIRING DIAGRAM
DI7NL±01

DI6QW±04
I15489
Body ECU
B B9
B8
1 5
8 11
159
8
8
2
13 5 3 1
6
24
1 1BDR F
FJ27
J/C
W±B
W±B
B±GB±Y
W±G W±GWR±G
2C
2D
2K 2B2H
2D10A GAUGE IG1 Relay30A DOOR7.5A ECU±B
5A AM1
J11
J/C
ID Battery F13 F11100A DC/DC FL Block No. 1I15 Ignition Switch
AM1 IG1
F18
FL Block No. 2
120A MAINB9 E Instrument Panel J/B
B
IG
A 7.5A OBDII
9
2DR±G
D
D
J26
J/CW±L W±L
W DI±690
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT INSPECTION
Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the Body ECU.
WIRING DIAGRAM

I15489
Body ECU
B B9
B8
1 5
8 11
159
8
8
2
13 5 3 1
6
24
1 1BDR F
FJ27
J/C
W±B
W±B
B±GB±Y
W±G W±GWR±G
2C
2D
2K 2B2H
2D10A GAUGE IG1 Relay30A DOOR7.5A ECU±B
5A AM1
J11
J/C
ID Battery F13 F11100A DC/DC FL Block No. 1I15 Ignition Switch
AM1 IG1
F18
FL Block No. 2
120A MAINB9 E Instrument Panel J/B
B
IG
A 7.5A OBDII
9
2DR±G
D
D
J26
J/CW±L W±L
W DI±692
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
Ignition Switch Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery voltage is applied to the terminal ACC of the
ECU and when the ignition switch is turned to the ON position, battery voltage is applied to the terminal IG
of the ECU.
WIRING DIAGRAM
DI7NO±01

I15485
BatteryB9
BODY ECU
11
F112 5
6 3
2 15
1
11
1 WID2 2F
2K 2HTAIL
RELAY7.5A
TAIL Instrument Panel J/Bto Taillight
F18
FL BLock No. 2 FL Block No. 1LG LG
F13B±GTRLY
100A DC/DC 120A MAIN DI±696
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
Taillight Relay Circuit
CIRCUIT DESCRIPTION
Taillight relay will be ºONº by operating the taillight switch. The transistor which activates the tail light relay
has two sorts: one activates by the tail light switch for fail safe and the other activates by CPU.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.4 sec. intervals. This switches the taillight control relay ON and OFF, thus flashing the tail-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the taillight
control relay switches OFF, thus stopping the taillights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI6QY±04

I15484
2 3 66
8 7
1 4 2
1
4
3 2 1 1
11
1
710
883
A L D
FE
E
E
LE
ER±L
R±G
R±W
R±G R±W R±W R±W
R±G
R±G B±G
R±G B
F13 F12
2I
2A 1B1F
1F
1F3
ID2 IA2J20
J/C
IA1
J4J5
ID 2K 2A
15
17
BatteryC10 High Beam
Indicator Light
(Comb. meter) F18
FL Block No. 2
J11
J/CJ4 H2
Headlight RH
10A HEAD (LH) 10A HEAD (RH)
Short Pin HEAD RelayEngine Room J/BB9
Body ECU
Short Pin
120A MAIN
Instrument
Panel J/BJ12 J13
W±B
H1
Headlight
LH
1
FL Block No. 13
1
HRLY
Instrument
Panel J/B DI±698
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
Headlight Relay Circuit
CIRCUIT DESCRIPTION
Head light relay will be ºONº by operating the headlight switch. The transistor which activates the headlight
relay has two sorts: one activates directly by the headlight switch for fail safe and the other activates by CPU.
the one that activates by CPU has two systems and prevents the headlight from turning off at the time of
one system trouble in the automatic operation circuit.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.25 sec. intervals. This switches the headlight control relay ON and OFF, thus flashing the
headlights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the head-
light control relay switches OFF, thus stopping the headlights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI5VQ±04

I17121
8 8
1 2
9 B
BW±B W±B
L±B
L±B 2D
2K
J24 AA
J25 U1
Key Unlock
Warning Switch J11
J/C
J27 J272C Instrument
Panel J/B
IDJ/C A
12
KSW W±B Instrument Panel J/BBody ECU
DI±700
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
Key unlock warning switch circuit
CIRCUIT DESCRIPTION
The key unlock warning switch goes on when the ignition key is inserted in the key cylinder and goes off when
the ignition key is removed.
The ECU operates the key confinement prevention function while the key unlock warning switch is on.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check key unlock warning switch (See page BE±62).
NG Replace the key unlock warning switch.
OK
2 Check wireharness and connector between key unlock warning switch and body
ECU.
NG Repair or replace wireharness or connector.
DI7NP±01

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

I15483
10
9
16 4 7
5 1
2
6
5
4
3
2
16 2 6 2 6 5
8
9ACTD B9Body ECU
R
G
G R
GG
G G
GG RR
RR
RRG
R2I
2J J14
J14 J14
J15
J15
J15
J15 IG1
IC1
IQ1
BB1
BA1A
B
BAB C C
2L
2L D13
Door Lock Motor Front LH
D14
Door Lock Motor Front RH
D12
Door Lock Motor Rear RH
D11
Door Lock Motor Rear LH
Instrument Panel J/B IQ1
BB1
BA11ACT+
ACT±
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±717
2001 PRIUS (RM778U)
Door lock motor circuit
WIRING DIAGRAM
DI7NS±01