2001 TOYOTA PRIUS Service Repair Manual

± DIAGNOSTICSNAVIGATION SYSTEM
DI±853
2001 PRIUS (RM778U)
4 Is there anything such as a film stuck to the window?
Yes Reception may be affected by a screen such as
a film.
No
5 Service check mode. (Is º80±40, 41º is displayed in the unit check mode of the
navigation ECU?)
Yes Troubleshoot for each diagnosis.
No
Replace the navigation antenna.
HINT:
If the trouble still occurs, replace the navigation ECU.

± DIAGNOSTICSNAVIGATION SYSTEM
DI±855
2001 PRIUS (RM778U)
20. Vehicle position rotates without control. (Map rotates without
control)
INSPECTION PROCEDURE
1 Recheck. (While not rotating the vehicle, turn the ignition switch ON from OFF
again.)
OK Normal. (While the vehicle was turning, the igni-
tion switch was turned ON.)
NG
2 System check mode. (Is º58±10º is displayed in the unit check mode of the navi-
gation ECU?)
Yes Replace the navigation ECU.
No
3 System check mode. (Is º58±43º is displayed in the unit check mode of the navi-
gation ECU?)
Yes Replace and repair SPD terminal wire harness.
No
4 Navigation check mode (vehicle signal check mode: SPD and gyro).
OK Replace the navigation ECU.
NG
DI7PD±01

DI±856
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
Replace or repair wire harness.

± 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