2001 TOYOTA PRIUS Service Repair Manual

± DIAGNOSTICSNAVIGATION SYSTEM
DI±831
2001 PRIUS (RM778U)
5. No navigation displayed, ºAudio OFFº on audio screen and no
audio sound.
INSPECTION PROCEDURE
1 Service check mode.
NG Troubleshoot for each diagnosis.
OK
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
3 Check ºAVC±LAN communication circuitº (See page DI±860).
NG Replace the AVC±LAN circuit or radio receiver
assembly.
OK
DI7OY±01

DI±832
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
Replace the multi display.

± DIAGNOSTICSNAVIGATION SYSTEM
DI±833
2001 PRIUS (RM778U)
6. Screen cannot be dimmed in night time.
INSPECTION PROCEDURE
1 Check if the screen is dimmed at night. (With the light control switch ON), do all
screens except the navigation screen appear in Night Mode?)
NG Check the light control switch.
OK
2 Check the multi display.
CHECK:
Check terminal TAIL.
OK:
TAIL: See ºMulti displayº of ºTERMINAL OF ECUº.
NG Replace or repair wire harness.
OK
3 Check the multi display.
PREPARATION:
Disconnect the multi display 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.
DI7OZ±01

DI±834
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
OK
Replace the multi display.

DI±836
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
8. Color on navigation screen is unusual (RGB signal error).
INSPECTION PROCEDURE
1 Display check mode (Color bar check).
NG Replace the multi display.
2 Navigation check mode (Color bar check).
NG Go to step 4.
OK
3 Check the screen setting. (Day or Night mode)
OK Normal.
NG
4 Check the navigation ECU.
CHECK:
Check terminals +B.
OK:
+B: 10 ± 14 V
CHECK:
Check terminal ACC when turn ignition switch ACC or ON position.
OK:
ACC: 10 ± 14 V
CHECK:
Check terminal R, G, B, VR or VG.
OK:
R, G, B, VR or VG: See ºNavigation ECUº of ºTERMINAL OF ECUº
NG Replace the wire harness when all terminals are
faulty. Replace the wire harness when SYNC ter-
minal is faulty.
DI7P1±01

± DIAGNOSTICSNAVIGATION SYSTEM
DI±837
2001 PRIUS (RM778U)
OK
Replace the multi display.

DI±840
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
11. No sound (radio, cassette tape, CD) can be heard from driver
side door speaker only.
INSPECTION PROCEDURE
1 Service check mode.
NG Troubleshoot for each diagnosis.
OK
2 Check wire harness (between navigation ECU and radio receiver assembly).
PREPARATION:
Disconnect the navigation ECU and radio receiver assembly connector.
CHECK:
(a) Check continuity between terminal AUI+ of navigation ECU connector and terminal FL+ of radio receiv-
er assembly.
(b) Check continuity between terminal AUI± of navigation ECU connector and terminal FL± of radio receiv-
er assembly.
OK:
Continuity
NG Replace or repair wire harness.
OK
3 Check the navigation system voice.
OK Go to step 6.
NG
DI7P4±01