TOYOTA AVENSIS 2005 Service Repair Manual

I35616
GND
ACC
+B
05±1414
±
DIAGNOSTICS AUDIO SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1INSPECT RADIO RECEIVER ASSY(BU, ACC, GND)
(a)Remove the radio receiver assy.
(b)Check continuity between terminals at each condition, as shown in the chart.
Standard:
Tester connectionConditionSpecified condition
GND ± Body groundAlwaysContinuity
(c)Check the voltage between terminals at each condition,
as shown in the chart.
Standard:
Tester connectionConditionSpecified condition
+B ± GNDAlways10 to 14 V
ACC ± GNDIgnition SW ACC10 to 14 V
NGREPAIR OR REPLACE HARNESS OR CONNECTOR (See page 01±32)
OK
2 CHECK FOR PROBLEM SYMPTOMS TABLE
(a)Check problem symptoms table (See page 05±1412).
Suspected areas are clearedA
Suspected areas still existB
B PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See
page 05±1412 )
A
REPLACE RADIO RECEIVER ASSY

0549M±11
05±1412
±
DIAGNOSTICS AUDIO SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
PROBLEM SYMPTOMS TABLE
RADIO RECEIVER ASSY
SymptomSuspect AreaSee page
Pressing power switch does not start system.5. Power source circuit (radio receiver assy)05±1413
Sound quality is bad in all modes. (volume is too low)1. Power source circuit (radio receiver assy)
2. Sound quality is bad in all modes (volume is too low)05±1413
05±1415
Noise occurs.±05±1419
Radio broadcast cannot be received. (bad reception)±05±1420
CD cannot be inserted or is ejected right after insertion.1. Power source circuit (radio receiver assy)
2. CD cannot be inserted or is ejected right after insertion05±1413
05±1422
CD cannot be ejected.1. Power source circuit (radio receiver assy)
2. CD cannot be ejected05±1413
05±1424
Sound quality is bad only when CD is played.(volume is too low)±05±1425
CD sound skips.±05±1426
Cassette tape cannot be inserted or played.1. Power source circuit (radio receiver assy)
2. Cassette tape cannot be inserted or played05±1413
05±1428
Cassette tape cannot be ejected.1. Power source circuit (radio receiver assy)
2. Cassette tape cannot be ejected05±1413
05±1429
Sound quality is bad only when playing tape.±05±1430
Tape is tangled due to incorrect tape speed or auto±reverse mal-
function.±05±1431
STEERING PAD SWITCH
SymptomSuspect AreaSee page
A audio system cannot be operated with steering pad switch±05±1432

05C4Y±01
I35611
R10 R12 R11 R9
05±1410
± DIAGNOSTICSAUDIO SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
TERMINALS OF ECU
1. RADIO RECEIVER ASSY
Terminal No. (Symbols)Wiring ColorConditionSTD Voltage (V)
R9±1(FR+) ± R9±7(GND)LG ± BR*1
LG ± W±B*2Audio system is playing
A waveform synchro-
nized with sounds is
output
R9±2(FL+) ± R9±7(GND)P ± BR*1
P ± W±B*2Audio system is playing
A waveform synchro-
nized with sounds is
output
R9±3(ACC) ± R9±7(GND)GR ± BR*1
GR ± W±B*2Ignition switch to ACC10 to 14
R9±4(+B) ± R9±7(GND)L±Y ± BR*1
L±Y ± W±B*2Always10 to 14
R9±5(FR±) ± R9±7(GND)L ± BR*1
L ± W±B*2Audio system is playing
A waveform synchro-
nized with sounds is
output
R9±6(FL±) ± R9±7(GND)V ± BR*1
V ± W±B*2Audio system is playing
A waveform synchro-
nized with sounds is
output
R9±7(GND) ± Body ground
BR*1 ±
Body ground
W±B*2 ±
Body ground
AlwaysContinuity
R9±8(ANT) ± R9±7(GND)B ± BR*1
B ± W±B*2Radio switch ON and AM or FM10 to 14
R9±10(ILL+) ± R9±7(GND)G ± BR*1
G ± W±B*2Light control switch TAIL10 to 14
R10±1(RR+) ± R9±7(GND)B ± BR*1
R ± W±B*2Audio system is playing
A waveform synchro-
nized with sounds is
output
R10±2(RL+) ± R9±7(GND)B ± BR*1
B ± W±B*2Audio system is playing
A waveform synchro-
nized with sounds is
output
R10±3(RR±) ± R9±7(GND)W ± BR*1
W ± W±B*1Audio system is playing
A waveform synchro-
nized with sounds is
output
R10±6(RL±) ± R9±7(GND)Y ± BR*1
Y ± W±B*2Audio system is playing
A waveform synchro-
nized with sounds is
output
R11±6(GND) ± R9±7(GND)W±R ± BR*1
W±R ± W±B*2AlwaysBelow 1.0
R11±7(SW1) ± R9±7(GND)LG ± BR*1
LG ± W±B*2
Steering pad switch not operating.
SEEK+ switch push
SEEK± switch push
VOL+ switch push
VOL± switch push4 or more
Approx. 0.5
Approx. 0.9
Approx. 2.0
Approx. 3.4

± DIAGNOSTICSAUDIO SYSTEM
05±1411
AVENSIS REPAIR MANUAL (RM1018E)R11±8(SW2) ± R9±7(GND)
P ± BR*1
P ± W±B*2Steering pad switch is not operating

MODE switch push4 or more

Below 2.5
R12±9 (TX+)PSee ºService Check Modeº±
R12±10 (TX±)LGSee ºService Check Modeº±
*1: LHD
*2: RHD

I34723
6
8N4 M2
7
12 3VG
R GB SYNC
VRR VG
G SYNC
VR B W
R G
Y18
3
7
26Navigation ECU
B M2
M2
M2
M2
M2(Shielded) Multi±display
(CRT Display) Display
N4
N4
N4
N4
N4
± DIAGNOSTICSNAVIGATION SYSTEM
05±1477
AVENSIS REPAIR MANUAL (RM1018E)
COLOR ON NAVIGATION SCREEN IS UNUSUAL (RGB SIGNAL
ERROR)
WIRING DIAGRAM
05C3M±01

I35666
R
B
Multi±display (CRT Display) Display:
Navigation ECU: GVR
VG
G VGVR
B
R
M2
N4
05±1478
±
DIAGNOSTICS NAVIGATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1CHECK HARNESS AND CONNECTOR(MULTI±DISPLAY (CRT DISPLAY)DISPLAY ± NAVIGATION ECU)
(a)Disconnect the connectors from the multi±display (CRT
display)display and navigation ECU.
(1)Check continuity between the terminals at each
condition, as shown in the chart.
Standard:
Tester connectionSpecified condition
VG ± VGContinuity
VR ± VRContinuity
R ± RContinuity
G ±GContinuity
B ± BContinuity
(2)Check for a short between the terminals at each condition, as shown in the chart.
Standard:
Tester connectionSpecified condition
VG ± Body groundContinuity
VR ± Body groundContinuity
R ± Body groundNo continuity
G ± Body groundNo continuity
B ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
2REPLACE MULTI±DISPLAY (CRT DISPLAY) DISPLAY (See page 67±6)
Standard: Normally returns. NG REPLACE NAVIGATION ECU (See page 67±27)
OK
SYSTEM OK

I34723
6
8N4 M2
7
12 3VG
R GB SYNC
VRR VG
G SYNC
VR B W
R G
Y18
3
7
26Navigation ECU
B M2
M2
M2
M2
M2(Shielded) Multi±display
(CRT Display) Display
N4
N4
N4
N4
N4
± DIAGNOSTICSNAVIGATION SYSTEM
05±1475
AVENSIS REPAIR MANUAL (RM1018E)
NAVIGATION SCREEN IS NOT STABILIZED (SYNCRONOUS
ERROR)
WIRING DIAGRAM
05C3L±01

I35666
Multi±display (CRT Display) Display:Navigation ECU: SYNCVR
VG
SYNC VGVR
M2
N4
05±1476
±
DIAGNOSTICS NAVIGATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1CHECK HARNESS AND CONNECTOR(MULTI±DISPLAY (CRT DISPLAY)DISPLAY ± NAVIGATION ECU)
(a)Disconnect the connectors from the multi±display (CRT
display)display and navigation ECU.
(1)Check continuity between the terminals at each
condition, as shown in the chart.
Standard:
Tester connectionSpecified condition
VG ± VGContinuity
VR ± VRContinuity
SYNC ± SYNCContinuity
(2)Check for a short between the terminals at each condition, as shown in the chart.
Standard:
Tester connectionSpecified condition
VG ± Body groundContinuity
VR ± Body groundContinuity
SYNC ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
2REPLACE MULTI±DISPLAY (CRT DISPLAY) DISPLAY (See page 67±6)
Standard: Normally returns. NG REPLACE NAVIGATION ECU (See page 67±27)
OK
SYSTEM OK

I34725
Multi±display
(CRT Display) Display
CTX±
CTX+
TX3+
TX3±
GTX+
GTX±M2
M1 M2
M1
M1
M110
5
12
24
5
18LG
V
G±Y
G
P
LG10
5Navigation ECU
Body ECU
(Combination Meter Assy)
Radio Receiver Assy3
4
9
10 C10
C10
R6
R6N4
N4TX±
TX+
TX± TX+
± DIAGNOSTICSNAVIGATION SYSTEM
05±1471
AVENSIS REPAIR MANUAL (RM1018E)
AVC±LAN CIRCUIT
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT APPARATUS
(a) Choose the apparatus to be inspected.
ApparatusGo to step
Radio receiver assyA
Navigation ECUB
Body ECU (Combination Meter Assy)C
B Go to step 4
C Go to step 6
A
05C3K±01

I35665
GTX+GTX±
TX+
TX±
Radio Receiver Assy: Multi±display (CRT Display) Display:
M2
R12
05±1472
±
DIAGNOSTICS NAVIGATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
2SERVICE CHECK MODE(RADIO RECEIVER ASSY)
(a)Perform the service check. (1)Start the diagnosis system and read the check result for the radio recei\
ver assy.
Standard:
AºNCONº is displayed or nothing is displayed (AUDIO H/U)
BºGOODº is displayed
BREPLACE MULTI±DISPLAY (CRT DISPLAY) DISPLAY (See page 67±6)
A
3CHECK HARNESS AND CONNECTOR(MULTI±DISPLAY (CRT DISPLAY) DISPLAY ± RADIO RECEIVER ASSY)
(a)Disconnect the connectors from the multi±display (CRT
display) display and radio receiver assy.
(1)Check continuity between the terminals at eachcondition, as shown in the chart.
Standard:
Tester connectionSpecified condition
GTX+ ± TX+Continuity
GTX± ± TX±Continuity
(2)Check for a short between the terminals at each condition, as shown in the chart.
Standard:
Tester connectionSpecified condition
GTX+ ± Body groundNo continuity
GTX± ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE RADIO RECEIVER ASSY (See page 67±5)