2001 TOYOTA PRIUS Service Repair Manual

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.

DI7OR±01
I17101
Navigation system normal operation
to 2. SYSTEM CHECK MODE SCREEN
to 4. DISPLAY
CHECK MODE SCREEN to 3. NAVIGATION
CHECK MODE SCREENDiagnosis start±up. (refer to next page)
HINT:
When Diagnosis Sys-
tem mode is started,
system check is per-
formed at first and the
check result is dis-
played. DI±796
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
PRE±CHECK
1. DIAGNOSIS SYSTEM MODE
HINT:
Diagnosis System Mode is operated as follows.

I15593
I17110
Concealed
touch
switch
± DIAGNOSTICSNAVIGATION SYSTEM
DI±797
2001 PRIUS (RM778U)
(a) DIAGNOSIS START±UP
To start the diagnosis menu, there are 2 ways: using a
diagnosis check wire and using a switch.
(b) START±UP BY SWITCH OPERATION
(1) Vehicle speed is 0 km/h (0 mph).
(2) Parking brake switch is pressed.
(3) Press the Display switch to display the Screen Ad-
justment screen.
(4) Repeatedly touch the upper and lower bottom parts
of the left end of the screen 3 times.
(c) FINISHING DIAGNOSIS SYSTEM MODE
Turn the ignition switch from ACC to OFF to finish the
mode. If it is started by switch operation.

I15446
to 1. Diagnosis
MENU screenDTC memory and history clear
DTC memory clear
Recheck
DTC clearWhen there are individual DTC data.Ye s
No DI±798
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
2. SERVICE CHECK MODE
HINT:
Service Check Mode is operated as follows.