2001 TOYOTA PRIUS navigation

± DIAGNOSTICSNAVIGATION SYSTEM
DI±863
2001 PRIUS (RM778U)
27. No AM, FM or CD screen is displayed.
INSPECTION PROCEDURE
1 Check the sound. (Check if the sound of the radio, cassette or CD can be heard.)
OK System check mode. (Check radio receiver as-
sembly)
NG
2 Check the radio receiver assembly.
PREPARATION:
Disconnect the radio receiver assembly connector.
CHECK:
Check voltage terminals +B.
OK:
+B: 10 ± 14 V
CHECK:
Check voltage terminal ACC when turn ignition switch ACC or ON position.
OK:
ACC: 10 ± 14 V
CHECK:
Check continuity terminal GND.
OK:
GND: Continuity
NG Replace or repair wire harness.
OK
DI7PK±01

DI±864
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
3 Check ºAVC±LAN communication circuitº (See page DI±860).
NG Replace or repair AVC±LAN circuit.
OK
Replace the radio receiver assembly.

I11572
Radio Receiver Assembly Multi Display Navigation ECU
Terminator
± DIAGNOSTICSNAVIGATION SYSTEM
DI±865
2001 PRIUS (RM778U)
AVC±LAN (Communication bus) Circuit
CIRCUIT DESCRIPTION
Each unit of navigation system connected with AVC±LAN (communication bus) transfers the signal of each
switch by communication.
When +B short and GND short occur in this AVC±LAN, navigation system will not function normally as the
communication is discontinued.
In this AVC±LAN, multi display becomes the master of the communication, and the radio receiver assembly
has a terminator necessary for transmitting the communication.
multi display is connected between navigation ECU and radio receiver assembly, navigation system has the
structure that makes communication impossible without navigation ECU, multi display or radio receiver as-
sembly.
AVC±LAN
DI7PL±01

I15473
Navigation ECU Multi Display
Radio receiver assemblyR G
N3 10
TX1±
TX1+
AUO+
AUO±
AUI± G 7
M6
N35
IJ16
RG
5
M6 TX1±
TX+TX± TX1+
10
M5
3
M5RG
N22
G P
IJ26
IG13
V4
R7
R
N211
N2
1
AUI+ N210
V
P 9
IJ28 V 6
R32 F14
Front
Door
Speaker
LH2
FL±
TX+
R4
9
FL+ TX±10
10
R4 R
G C
F C
F
J26
J/C C7
Center Cluster SW
7
8CF
R
G TX+
TX±AVC±LAN circuit
P R3IJ2 IJ2 IG1 1IJ1 DI±866
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
WIRING DIAGRAM

± DIAGNOSTICSNAVIGATION SYSTEM
DI±867
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check wire harness and connector between radio receiver assembly and naviga-
tion ECU (See page IN±41).
NG Repair or replace wire harness or connector be-
tween radio receiver assembly and navigation
ECU.
OK
2 Check wire harness and connector between multi display and navigation ECU
(See page IN±41).
NG Repair or replace wire harness or connector be-
tween multi display and navigation ECU.
OK

I12172
Navigation ECUMulti DisplayRadio Receiver
Assembly
SST
TX± TX+TX± TX+
Radio receiver assembly connector ºR4º
DI±868
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
3 Skip radio receiver assembly and check AVC±LAN.
PREPARATION:
(a) Connect Multi Display connector.
(b) Disconnect radio receiver assembly ºR4º connector.
(c) Using SST (Navigation Check Wire P/N 09843±18050),
connect the terminal TX+ to terminal TX± of ºR4º connec-
tor of radio receiver assembly.
CHECK:
Operate the panel switch and the touch switch of the display
and check that the navigation functions.
(Check that AVC±LAN is recovered.)
OK Replace the radio receiver assembly.
NG
Replace the Navigation ECU.

BE1UV±01
I17103
Audio system normal operation
to 2. SYSTEM CHECK MODE SCREEN
to 4. DISPLAY
CHECK MODE SCREEN Diagnosis 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.
± BODY ELECTRICALAUDIO SYSTEM
BE±97
2001 PRIUS (RM778U)
TROUBLESHOOTING
1. DIAGNOSIS SYSTEM MODE (w/o Navigation system)
HINT:
Diagnosis System Mode is operated as follows.
In case of a vehicle without navigation system, there is no navigation check mode. However, other modes
except for this are same as a vehicle with navigation system.

I15593
I17110
Concealed
touch
switch
BE±98
± BODY ELECTRICALAUDIO SYSTEM
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.
2. DIAGNOSIS SYSTEM MODE (w/ Navigation system)
(See page DI±789)