2001 TOYOTA PRIUS Service Repair Manual

Absence of
Master D6 01
(Communication
Control)Component in which this code is re-
corded has been disconnected
from system with ignition in ACC or
ON. Or, when this code was re-
corded, multi±display assembly
was disconnected.
Check harness for power supply
system of multi display.

Check harness for communica-
tion system of multi display.

Check harness for power supply
system of navigation ECU.

Check harness for communica-
tion system of navigation ECU.
Connection
Check Error D7 01 *6
(Communication
Control)Component in which this code is re-
corded has been disconnected
from system after engine start.
Or, when this code was recorded,
multi±display assembly was dis-
connected.
D6
Check harness for power supply
system of multi display.

Check harness for communica-
tion system of multi display.

Check harness for power supply
system of navigation ECU.

Check harness for communica-
tion system of navigation ECU.
Transmission
Error DC 01
(Communication
Control)Transmission to component shown
by auxiliary code has been failed.
(This code does not necessarily
mean actual failure.)If same auxiliary code is recorded in
other component(s), check harness
for power supply and communica-
tion system of components shown
sub code.
Master Reset
(Momentary
Interruption) DD 01
(Communication
Control)
Check harness for power supply
system of multi±display assembly.

Check harness for communica-
tion system of multi±display assem-
bly.

If error occurs frequently, replace
multi±display assembly.
Registration
Completion
Instruction
Error E0 01
(Communication
Control)ºRegistration Completion Instruc-
tionº command from multi display
cannot be received.Since this DTC is provided for engi-
neering, it may be detected when
no actual failure exists.
ON/OFF
Instruction
Parameter
Error E2 01
(Communication
Control)Error is detected in ON/OFF control
command from multi±display as-
sembly.Replace multi±display assembly.
Registration
Request
Transmission E3 01
(Communication
Control)Since this DTC is provided for engi-
neering, it may be detected when
no actual failure exists.
Registration Request command
is output from slave component.

By reception of connection check
Instruction, Registration Request
command is output from sub±mas-
ter component.After engine is started, multi±dis-
play assembly was disconnected
from system.
Master Error DF 01
(Communication
Control)Due to defective condition of com-
ponent with a display, master func-
tion is switched to audio equip-
ment . Error occurs in communica-
tion between sub±master (audio)
and master component.
Check harness for power supply
of multi±display assembly.

Check harness for communica-
tion system of multi±display assem-
bly.

Check harness for communica-
tion system between multi±display
assembly and sub±master compo-
nent.
Plural Frame
Abort E4 01
(Communication
Control)
Since this DTC is provided for en-
gineering purpose, it may be de-
tected when no actual failure exists. Plural frame transmission is
aborted.
*6: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition
switch in ACC or ON, this code is stored. DI±818
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)

DI7OT±01
I15528
M5
M6M7
DI±820
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
TERMINALS OF ECU
MULTI DISPLAY
SymbolsC ditiSTD V lt (V)
Problem symptom when
open circuit is detected.
Symbols
(Terminals NO. )ConditionSTD Voltage (V)Problem symptom when
short circuit is detected.
TX+ (M5±3)Ignition switch
ACC or ONAbout 2.5 V Screen is in disorder.
TX3+ (M5±4)Ignition switch
ACC or ONAbout 2.5 V Screen is in disorder.
SPD ± GND
(M5±5 ± M7±6)Ignition switch ON, and driving
wheel rotated slowlyRepeatedly changes from below 1
to 9 VFuel efficiency cannot be calcu-
lated.
TX± (M5±10)Ignition switch
ACC or ONAbout 2.5 V Screen is in disorder.
TX3± (M5±11)Ignition switch
ACC or ONAbout 2.5 V Screen is in disorder.
PKB ± GND
(M5±13 ± M7±6)Parking brake switch ON (parking
brake lever released)5 V The system cannot enter Diagno-
sis System mode.
TC ± GNDIgnition switch OFF and connectContinuityNavigation system is normal.TC ± GND
(M5±14 ± M7±6)
Ignition switch OFF and connect
thermals TC and E1 of diagnosis
check connector
Continuity
The system cannot exit Service
Check mode.
VR ± VG
(M6±1 ± M6±6)ConstantContinuityScreen noise or other types of
noise occur.
R ± VG
(M6±2 ± M6±6)Diagnosis display check screen is
white (Using an oscilloscope)0.7 V ± 0.1 V *2Screen color turns to blue.
B ± VG
(M6±3 ± M6±6)Diagnosis display check screen is
white (Using an oscilloscope)0.7 V ± 0.1 V *2Screen color turns to yellow.
TX1+ (M6±5)AVC±LAN
communication circuit±Navigation system does not oper-
ate.
VG ± GND
(M6±6 ± M7±6)
ConstantContinuityScreen noise or other types of
noise occur.
(M6±6 ± M7±6)
Navigation system does not op-
eration.
G ± VG
(M6±7 ± M6±6)Diagnosis display check screen is
white (Using an oscilloscope)0.7 V ± 0.1 V *2Screen color turns to red±purple.