Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 19 audsy trou
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BE-1 14
BODY ELECTRICAL - AUDIO SYSTEM
BE1ZT-01
TROUBLESHOOTING
1. DIAGNOSIS FUNCTION
(a) Diagnosis start-up
For shifting to diagnosis mode, push "CD" button 3 times with pressing "1" and "6" of TRUCK TUNE
APS button at the same time while the audio power is OFF and ACC is ON.
In diagnosis mode, by pressing "CD" button for 2 seconds or turning the ignition key OFF, the diagnosis
mode is released.
TUNE "UP" and
"DOWN" buttons
"CD" button
"1" button "6" button I11923
(b) Service check mode
(1) After the diagnosis start-up, the system enters service check mode when "TUNE UP" switch is
pressed.
(2) Error codes over tuner and connected equipment are displayed on the screen of tuner.
Results for each check are displayed as follows:
S good:
No DTC is detected for both "System Check Confirmation" and "Diagnosis Memory Re-
sponse".
S nCon:
The Component does not respond to the "Diagnosis On Instruction" command.
Applicable to only the system where connected components are limited to be used.
S ECHn:
Application of new version has been confirmed by the "Diagnosis On Check", and there
is one or more DTC which indicates "Replacement" in the "System Check Result Re-
sponse" or "Diagnosis Memory Response".
S CHEC:
Application of new version has been confirmed by the "Diagnosis On Check", and there
is no DTC which indicates "Replacement" in the "System Check Result Response" or
"Diagnosis Memory Response", but one or more DTC which indicated "Check" is identified.
S Old:
Application of old version is confirmed by the "Diagnosis On Check", and DTC is identified
in the "System Check Result Response" or "Diagnosis Memory Response".
S nrES:
No response is identified to the "System Check Start Instruction" and "Request for System
Check Result" commands.
2001 SIENNA (RM787U)
Author : Date : 1632
BE-1 15
BODY ELECTRICAL - AUDIO SYSTEM
(c) Display Screen for Service Check.
Example:
Connection parts ( physical address): Multi Display (P160), Radio Receiver (P190), CD changer (P360)
Turn ignition switch ON.
Normal Mode HINT:
Push the "TAPESCD" switch 3
times while pressing "ch1" and To exit from diagnosis mode,
"ch6" switches. press the "TAPESCD" switch for
1.7 sec. or turn ignition switch to
ACC or OFF
L 3 beeps
Service Check Mode Physical Address
P160 (When checking, P160 is blinking.)
TUNE DOWN TUNE UP
ch2
"ECHN" Detail
Result (Replacing) ECHN Display Mode
ch3 (Refer to (b))
TUNE DOWN TUNE UP
P190 Physical Address
TUNE DOWN TUNE UP
ch2
"CHEC" Detail
Result (Check) CHEC Display Mode
(Refer to (c))
ch3
TUNE DOWN TUNE UP
P360 Physical Address
TUNE DOWN TUNE UP
ch2
"OLD" Detail
Result (Old) OLD
Display Mode
ch3 (Refer to (d))
: Indicates a switch operation ch5 (1.7 sec.) L A long beep (3 sec.)
CLr
After 3 sec.
Memory Clear Mode
S After the memory is cleared, only the physical address is displayed cyclically.
S When re-checking (ch1 switch is pressed) in that condition, the result is also
displayed as shown above.
2001 SIENNA (RM787U)
Author : Date : 1633
BE-1 16
BODY ELECTRICAL - AUDIO SYSTEM
(d) "ECHN" Detail Display Mode Screen
P160
TUNE DOWN TUNE UP
Service Check Mode
TUNE UP
CLr
ECHN
TUNE DOWN
ch2 ch5 (Along)
ch3
"ECHN" Detail Display Mode
P160 Physical Address of Component
TUNE DOWN TUNE UP
SyS
TUNE DOWN TUNE UP
Details for 1st
1- *** Logical Address
Component
TUNE DOWN TUNE UP
DTC (Refer to diagnostic
1-22 trouble code chart)
TUNE DOWN TUNE UP
COdE
TUNE DOWN TUNE UP
2- *** Logical Address
TUNE DOWN TUNE UP
DTC (Refer to diagnostic
2-E4
trouble code chart)
TUNE DOWN TUNE UP
2- *** Auxiliary Code
Details for 2nd
TUNE DOWN TUNE UP Component
2- ** Connection Check Code
TUNE DOWN TUNE UP
2- ** Number of Occurrence
TUNE DOWN TUNE UP
Continued if more than one DTC is identified.
TUNE DOWN TUNE UP
: Indicates a switch operation Detail code is displayed cyclically.
2001 SIENNA (RM787U)
Author : Date : 1634
BE-1 17
BODY ELECTRICAL - AUDIO SYSTEM
(e) "CHEC" Detail Display Mode Screen
P190
TUNE DOWN TUNE UP
Service Check Mode
TUNE UP
CHEC
CLr
TUNE DOWN
ch3 ch5 (Along)
ch2
"CHEC" Detail Display Mode P190 Physical Address of Component
TUNE DOWN TUNE UP
COde
TUNE DOWN TUNE UP
1- ** Logical Address
TUNE DOWN TUNE UP
DTC (Refer to diagnostic
1-E4
trouble code chart)
TUNE DOWN TUNE UP Details for 1st
1-P160 Auxiliary Code (*1) Component
TUNE DOWN TUNE UP
1- ** Connection Check Code
TUNE DOWN TUNE UP
Detail code is displayed cyclically. 1- ** Number of Occurrence (*1)
TUNE DOWN TUNE UP
2- ** Logical Address
TUNE DOWN TUNE UP
2-DC DTC (Refer to diagnostic
trouble code chart)
TUNE DOWN TUNE UP
2- ** Details for 2nd
Auxiliary Code (*1)
Component
TUNE DOWN TUNE UP
2- ** Connection Check Code
TUNE DOWN TUNE UP
2- ** Number of Occurrence (*1)
(*1): There are some diagnostic Continued if more than one DTC is identified.
codes witch might not be displayed.
In this case, "- - -" is displayed.
TUNE DOWN TUNE UP
: Indicates a switch operation
2001 SIENNA (RM787U)
Author : Date : 1635
BE-1 18
BODY ELECTRICAL - AUDIO SYSTEM
(f) "OLD" Detail Display Mode Screen
P360
TUNE DOWN TUNE UP
Service Check Mode
TUNE UP
OLD
CLr
TUNE DOWN
ch3 ch5 (Along)
ch2
"CHEC" Detail Display Mode P360 Physical Address of Component
TUNE DOWN TUNE UP
COde
TUNE DOWN TUNE UP
1- ** Logical Address
TUNE DOWN TUNE UP
DTC (Refer to diagnostic
1-E4
trouble code chart)
TUNE DOWN TUNE UP Details for 1st
1-P160 Auxiliary Code (*1) Component
TUNE DOWN TUNE UP
1- ** Connection Check Code
TUNE DOWN TUNE UP
Detail code is displayed cyclically. 1- ** Number of Occurrence (*1)
TUNE DOWN TUNE UP
2- ** Logical Address
TUNE DOWN TUNE UP
2-DC DTC (Refer to diagnostic
trouble code chart)
TUNE DOWN TUNE UP
2- ** Details for 2nd
Auxiliary Code (*1)
Component
TUNE DOWN TUNE UP
2- ** Connection Check Code
TUNE DOWN TUNE UP
2- ** Number of Occurrence (*1)
(*1): There are some diagnostic Continued if more than one DTC is identified.
codes witch might not be displayed.
In this case, "- - -" is displayed.
TUNE DOWN TUNE UP
: Indicates a switch operation
(g) Recheck
(1) Pressing the [ch1] key in Service Check Mode executes recheck.
(2) To display the recheck process, follow the sequence indicated Display Screen for Service Check.
2001 SIENNA (RM787U)
Author : Date : 1636
BE-1 19
BODY ELECTRICAL - AUDIO SYSTEM
2. DIAGNOSIS CODE LIST
Physical address: 190 Radio receiver assembly
Diagnosis content Countermeasure and
Logical address DTC Diagnosis item
inspected parts
01 21 ROM Error Error is detected in internal ROM. Replace radio receiver assembly.
(Communication
Control)
01 22 RAM Error Error is detected in internal RAM. Replace radio receiver assembly.
(Communication
Control)
01 *2 D6 Absence of Component in which this code is re- D Check harness for power supply
(Communication Master corded has been disconnected from system ofradio receiver assembly.
Control) system with ignition in ACC or ON. D Check harness for communica-
Or, when this code was recorded, ra- tion system ofradio receiver assem-
dio receiver assembly assembly was bly.
disconnected. D Check harness for power supply
system of radio receiver assembly.
D Check harness for communica-
tion system of radio receiver as-
sembly.
01 *3 D8 No Response Component shown by auxiliary code D Check harness for power supply
(Communication to Connection is or had been disconnected from system of component shown by
Control) Check system after engine start. auxiliary code.
D9 D Check harness for communica-
tion system of component shown by
auxiliary code.
01 *2 D9 Last Mode Error Component operated (sounds and/ Check harness for power supply
(Communication or images were provided) before en- system of component shown by
Control) gine stop is or has been discon- auxiliary code.
nected with ignition switch in ACC or Check harness for communication
ON. system of component shown by
auxiliary code.
01 DA No Response No response is identified when D Check harness for power supply
(Communication to ON/OFF changing mode (audio and visual of component shown by auxiliary
Control) Instruction mode change). Detected when code.
sound and picture does not change D Check harness for communica-
by button operation. tion system of component shown by
auxiliary code.
D If error occurs again, replace
component shown by auxiliary
code.
01 *2 DB Mode Status Dual alarm is detected. D Check harness for power supply
(Communication Error of component shown by auxiliary
Control) code.
D Check harness for communica-
tion system of component shown by
auxiliary code.
01 *4 DC Transmission Transmission to component shown D If same auxiliary code is recorded
(Communication Error by auxiliary code has been failed. in other component, check harness
Control) (Detecting this DTC does not nec- for power supply and communica-
essary mean actual failure.) tion system of components shown
sub code.
01 *5 DD Master Reset After engine is started, radio receiv- D If this error occurs frequently, re-
(Communication (Momentary er assembly assembly was discon- place radio receiver assembly as-
Control) Interruption) nected from system. sembly.
2001 SIENNA (RM787U)
Author : Date : 1637
BE-120
BODY ELECTRICAL - AUDIO SYSTEM
01 *5 DE Slave Reset After engine is started, slave com- D Check harness for power supply
(Communication (Momentary ponent was disconnected from sys- of component shown by auxiliary
Control) Interruption) tem. code.
D Check harness for communica-
tion system of component shown by
auxiliary code.
01 *6 DF Master Error Due to defective condition ofradio D Check harness for power supply
(Communication receiver assembly, master function of radio receiver assembly assem-
Control) is switched to audio equipment. bly.
Error occurs in communication be- D Check harness for communica-
tween sub-master (audio) andradio tion system of radio receiver as-
receiver assembly. sembly .
D Check harness for communica-
tion system between radio receiver
assembly and sub-master compo-
nent.
01 E0 Registration "Registration Completion Instruc- D Since this DTC is provided for en-
(Communication Completion tion" command fromradio receiver gineering purpose, it may be de-
Control) Instruction assembly cannot be received. tected when no actual failure exists.
Error
01 *2 E1 Audio While source equipment is operat- D Check harness for power supply
(Communication processor ON ing, AMP output is stopped. of radio receiver assembly assem-
Control) error bly.
D Check harness for communica-
tion system of radio receiver as-
sembly.
01 E2 ON/OFF Error occurs in ON/OFF controlling D Replace radio receiver assembly
(Communication Instruction command from radio receiver as- .
Control) Parameter sembly assembly.
Error
01 E3 Registration Registration Request command is D Since this DTC is provided for en-
(Communication Request output from slave component. gineering purpose, it may be de-
Control) Transmission Receiving Connection Check tected when no actual failure exists.
Instruction, Registration Request
command is output from sub-mas-
ter component.
01 E4 Plural Frame Plural frame transmission is D Since this DTC is provided for en-
(Communication Abort aborted. gineering purpose, it may be de-
Control) tected when no actual failure exists.
60 43 AM Tuner Error Abnormal condition is detected in Replace radio receiver assembly.
(Radio receiver AM tuner.
assembly) 44 FM Tuner Error Inspect radio receiver assembly.
60 Abnormal condition is detected in Replace radio receiver assembly.
(Radio receiver FM tuner.
assembly)
61 40 Mechanical or Malfunction due to mechanical fail- Inspect cassette tape.
(Cassette Media Error ure is identified. Or, cassette tape is
switch) cut or entangled.
61 41 EJECT Malfunction due to mechanical fail- Replace radio receiver assembly.
(Cassette Malfunction ure.
switch)
2001 SIENNA (RM787U)
Author : Date : 1638
BE-121
BODY ELECTRICAL - AUDIO SYSTEM
Physical address: 440 Strereo component amplifier
HINT:
*1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
*2: It may be stored when the engine key is turned 1 min. angain agter engine start.
*3: It may be stored whn the engine key is turned again after engine start.
*4: When 210 sec. has passed after pulling out the power supply connectorof the master component with the ignition
switch in ACC or ON, this code is stored.
Logimal address DTC Diagnosis item Diagnosis content Countermeasure and inspeced parts
01 21 ROM Error Abnormal condition of ROM is Replace stereo component
( C o m m u n i c a- detected. amplifier
tion Control)
01 22 RAM Error Abnormal condition of RAM is Replace stereo component
( C o m m u n i c a- detected. amplifier
tion Control)
01 D6 Absence of Component in which this code is re- D Check harness for power supply
( C o m m u n i c a- *1 Master corded has been disconnected from system ofradio receiver assembly.
tion Control) system with ignition in ACC or ON. D Check harness for communication
Or, when this code was recorded, system ofradio receiver assembly.
multi-didplay assembly was discon- D Check harness for power supply
nected. system of stereo component ampli-
fier
D Check harness for communication
system of stereo component ampli-
fier.
01*6 D7 Connection Component in which this code is re- D Check harness for power supply
( C o m m u n i c a- Check Error corded has been disconnected from system ofradio receiver assembly.
tion Control) system after engine start. D Check harness for communication
Or, when this code was recorded, system of radio receiver assembly.
radio receiver assembly assembly D Check harness for power supply
was disconnected. system of stereo component ampli-
D6 fier
D Check harness for communication
system of stereo component ampli-
fier.
2001 SIENNA (RM787U)
Author : Date : 1639
BE-122
BODY ELECTRICAL - AUDIO SYSTEM
01 DC Transmission Transmission to component shown If same auxiliary code is recorded in
(Communication *2 Error by auxiliary code has bee failed. other component(s), check harness
Control) (This code does not necessarily for power supply and communica-
mean actual failure.) tion system of components shown
sub code.
01 DD Master Reset After engine is started, radio receiv- D Check harness for power supply
(Communication *3 (Momentary er assembly assembly was discon- system of radio receiver assembly
Control) Interruption) nected from system. assembly.
D Check harness for communica-
tion system of radio receiver as-
sembly assembly.
D If error occurs frequently, replace
radio receiver assembly.
01 DF Master Error Due to defective condition of com- D Check harness for power supply
(Communication *4 ponent with a display, master func- of radio receiver assembly assem-
Control) tion is switched to audio equip- bly.
ment . Error occurs in communica- D Check harness for communica-
tion between sub-master (audio) tion system of radio receiver as-
and master component. sembly assembly.
D Check harness for communica-
tion system between radio receiver
assembly and sub-master compo-
nent.
01 E0 Registration "Registration Completion Instruc- Since this DTC is provided for engi-
(Communication *1 Completion tion" command fromradio receiver neering, it may be detected when
Control) Instruction assembly cannot be received. no actual failure exists.
Error
01 E1 D Check harness for power supply
Audio proces- While source equipment is operat-
(Communication *1 ing, AMP output is stopped. system of radio receiver assembly
sor ON error
Control) D Check harness for communication
system of radio receiver assembly.
01 E2 ON/OFF Error is detected in ON/OFF control Replace radio receiver assembly .
(Communication Instruction command from radio receiver as-
Control) Parameter sembly assembly.
Error
01 E3 Registration D Registration Request command Since this DTC is provided for engi-
(Communication Request is output from slave component. neering, it may be detected when
Control) Transmission D By reception of connection check no actual failure exists.
Instruction, Registration Request
command is output from sub-mas-
ter component.
2001 SIENNA (RM787U)
Author : Date : 1640
BE-123
BODY ELECTRICAL - AUDIO SYSTEM
3. PROBLEM SYSMPTOMS TABLE
NOTICE:
When replacing the internal mechanism (computer part) of the audio system, be careful that no part
of your body or clothing comes in contact with the terminals of the leads from the IC, etc. of the re-
placement part (spare part).
HINT:
This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during sys-
tem operation and was prepared on the assumption of system component troubles (except for the wires and
connectors, etc.).
Always inspect the trouble taking the following items into consideration.
S Open or short circuit of the wire harness
S Connector or terminal connection fault
Problem Flow chart No.
Radio Radio not operating when power switch turned to 'ON'. 1
Display indicates when power switch turned to 'ON', but no sound (including
2
'noise') is produced.
Noise present, but AM - FM not operating. 3
Any speaker does not work. 4
Any AM or FM does not work. 5
Few preset turning bands. 5
Reception poor. 6
Sound quality poor. 7
Preset memory disappears. 8
Tape Player Cassette tape cannot be inserted. 9
Cassette tape inserted, but no power. 10
Power coming in, but tape player not operating. 11
Any speaker does not work. 12
Sound quality poor. 13
Tape jammed, malfunction with tape speed or auto-reverse. 14
Cassette tape will not eject. 15
Power Amplifier No power coming in. 16
Power coming in, but power amplifier not operating. 17
Any speaker does not work. 18
Noise Noise occurs 19
Noise produced by vibration or shock while driving. 20
Noise produced when engine starts. 21
The term "AM" includes LW,MW and SW, and the term "FW" includes UKW.
2001 SIENNA (RM787U)
Author : Date : 1641
BE-124
BODY ELECTRICAL - AUDIO SYSTEM
1 Radio RADIO NOT OPERATING WHEN POWER SWITCH TURNED TO "ON"
Is tape player operating normally? Radio assembly faulty.
Yes
No
Check if RAD-No.2 fuse is OK? Replace fuse.
NG
OK
Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes
Check if RAD-No.1 fuse is OK? Replace fuse.
OK NG
Is power supplied to +B terminal of power amplifier? + B wire harness faulty.
No
Yes
Check if GND (wire harness side) of power amplifier GND faulty.
grounded normally? NG
OK
Is power supplied to ACC terminal of radio assembly? Power amplifier or ACC wire harness faulty.
No
Yes
Is power supplied to +B terminal of radio assembly? Power amplifier or +B wire harness faulty.
Yes No
Check if GND (wire harness side) to radio assembly is OK? GND faulty.
NG
OK
Radio assembly faulty.
2001 SIENNA (RM787U)
Author : Date : 1642
BE-125
BODY ELECTRICAL - AUDIO SYSTEM
DISPLAY INDICATES WHEN POWER SWITCH TURNED TO
2 Radio
"ON", BUT NO SOUND (INCLUDING "NOISE") IS PRODUCED
Is tape player operating normally? Radio assembly faulty.
No Yes
Check if RAD-No.2 fuse is OK? Replace fuse.
OK NG
Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes
Check if RAD-No.1 fuse is OK? Replace fuse.
NG
OK
Is power supplied to +B terminal of power amplifier? + B wire harness faulty.
Yes No
Check if GND (wire harness side) of power amplifier GND faulty.
grounded normally?
NG
OK
Is power supplied to ACC terminal of radio receiver? Power amplifier faulty.
Yes No
Is power supplied to +B terminal of radio receiver? Power amplifier faulty.
Yes No
Check if GND (wire harness side) of power amplifier GND faulty.
grounded normally? NG
OK
Does continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes
Temporarily install another speaker. Functions OK? Speaker faulty.
Yes
No
Hiss noise from speaker? Power amplifier faulty.
No Recheck system after repair.
Yes
Radio assembly faulty. Recheck system after repair.
2001 SIENNA (RM787U)
Author : Date : 1643
BE-126
BODY ELECTRICAL - AUDIO SYSTEM
3 Radio NOISE PRESENT, BUT AM-FM NOT OPERATING
Go to No.25
If radio side faulty.
Radio faulty.
4 Radio ANY SPEAKER DOSE NOT WORK
Is tape player operating normally? Radio assembly faulty.
Yes
No
Is hiss noise produced by non-functioning speaker? Radio assembly faulty.
Yes Recheck system after repair.
No
Does continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes
Temporarily install another speaker? Functions OK? Speaker faulty.
Yes
No
Power amplifier faulty. Recheck system after repair.
2001 SIENNA (RM787U)
Author : Date : 1644
BE-127
BODY ELECTRICAL - AUDIO SYSTEM
ANY AM OR FM DOES NOR WORK
5 Radio FEW PRESET TUNING BANDS
Problem with radio wave signals or location? Poor signals, poor location.
Yes
No
Is power for the antenna being output from the radio assembly? Radio assembly faulty.
No Yes
Are both AM and FM defective?
No
Yes
Go to No.16
Is tape player operating normally? Radio assembly faulty.
No Yes
Temporarily install another speaker. Functions OK? Speaker faulty.
Yes
No
Hiss noise from speaker? Power amplifier faulty.
No Recheck system after repair.
Yes
Radio assembly faulty. Recheck system after repair.
2001 SIENNA (RM787U)
Author : Date : 1645
BE-128
BODY ELECTRICAL - AUDIO SYSTEM
6 Radio POOR RECEPTION
Is the condition bad in comparison with other vehicles? An electric wave environment is bad.
Yes
No
Are there any additional installation parts? Does the condition get better if
(Sun shade film, telephone antenna, etc.) Yes removing them?
No Yes
Influence of additional installation parts.
Check if there is any scratch and breaking of a wire on Repair. (See page BE-61 )
the glass antenna and the defogger pattern. Yes
(visual check. tester)
(See page BE-1 10)
No
Is the contact of the plug jack of the radio OK? Take a measure for contact.
No
Yes
Does the condition get better by using the outer Check the radio.
antenna (such as pillar antenna)? No
Yes
Is the contact of the antenna terminal on the glass Take a measure for contact.
surface and the defogger terminal? No
Yes
Is the continuity of the antenna cord OK? Replace the antenna cord.
Yes No
Check the grounding of the antenna, antenna cord, Grounding failure.
choke coil, and noise filter. (See page BE-1 10) NG
OK
Does the condition get better by replacing Replace the choke coil.
the choke coil? Yes
No
Does the condition get better by replacing the Replace the antenna cord.
antenna cord? Yes
No
Exchange the glass.
2001 SIENNA (RM787U)
Author : Date : 1646
BE-129
BODY ELECTRICAL - AUDIO SYSTEM
7 Radio SOUND QUALITY POOR
Is sound quality always bad? Is sound quality bad in certain Poor signals, poor location.
No Yes
areas only?
Yes
No
Is tape player operating normally?
No Yes
Radio assembly or power Radio assembly faulty.
amplifier faulty.
Is tape player operating normally? Radio assembly faulty.
No Yes
Is speaker properly installed? Install properly.
Yes No
Temporarily install another speaker. Functions OK? Speaker faulty.
Yes
No
Radio assembly or power amplifier faulty.
Recheck system after repair.
8 Radio PRESET MEMORY DISAPPEARS
Can cassette tape be inserted in tape player? Radio assembly faulty.
No Yes
Check if RADIO No.1 fuse is OK? Replace fuse.
OK NG
Is power supplied to +B terminal of power amplifier? +B wire harness faulty.
No
Yes
Check if GND (wire harness side) of power amplifier GND faulty.
grounded normally?
NG
OK
Is power supplied to +B terminal of radio assembly? Power amplifier faulty.
No
Yes
Check if GND (wire harness side) of radio assembly Power amplifier faulty.
NG
grounded normally?
OK
Radio assembly faulty.
2001 SIENNA (RM787U)
Author : Date : 1647
BE-130
BODY ELECTRICAL - AUDIO SYSTEM
9 Tape Player CASSETTE TAPE CANNOT BE INSERTED
Is there a foreign object inside tape player? Remove foreign object.
Yes
No
Is auto search button radio operating normally? Radio assembly faulty.
Yes
No
Check if RADIO No.1 fuse is OK? Replace fuse.
OK NG
Is power supplied to +B terminal of power amplifier? +B wire harness faulty.
No
Yes
Check if GND (wire harness side) of power amplifier GND faulty.
grounded normally?
NG
OK
Is power supplied to +B terminal of radio assembly? Power amplifier faulty.
No
Yes
Check if GND (wire harness side) of radio assembly Power amplifier faulty.
grounded normally? NG
OK
Radio assembly faulty.
10 Tape Player CASSETTE TAPE INSERTED, BUT NO POWER
Is radio operating normal? Radio assembly faulty.
No Yes
Check if RAD No.2 fuse is OK? Replace fuse.
OK NG
Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes
Check if RADIO No.1 fuse is OK? Replace fuse.
NG
OK
Is power supplied to +B terminal of radio assembly? +B wire harness faulty.
Yes No
Is power supplied to ACC terminal of radio assembly? Power amplifier faulty.
Yes No
Radio assembly faulty.
2001 SIENNA (RM787U)
Author : Date : 1648
BE-131
BODY ELECTRICAL - AUDIO SYSTEM
11 Tape Player POWER COMING IN, BUT TAPE PLAYER NOT OPERATING
Function OK if different cassette tape inserted? Cassette tape faulty.
Yes
No
Is radio operating normally? Radio assembly faulty.
Yes
No
Does continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes
Temporarily install another speaker. Speaker faulty.
Function OK? Yes
No
Hiss noise from speaker? Power amplifier faulty.
No
Recheck system after repair.
Yes
Radio assembly faulty.
Recheck system after repair.
12 Tape Player ANY SPEAKER DOES NOT WORK
Is radio operating normally? Radio assembly faulty.
Yes
No
Is hiss noise produced by non-functioning speaker. Radio assembly faulty.
Yes Recheck system after repair.
No
Does continuity exist in speaker wire harness? Speaker wire harness faulty.
Yes No
Temporarily install another speaker. Speaker faulty.
Function OK? Yes
No
Radio assembly or power amplifier faulty.
2001 SIENNA (RM787U)
Author : Date : 1649
BE-132
BODY ELECTRICAL - AUDIO SYSTEM
13 Tape Player SOUND QUALITY POOR (VOLUME FAINT)
Function OK if different cassette tape inserted? Cassette tape faulty.
Yes
No
Operates normally after cleaning the heads? Head dirty.
Yes
No
Is radio operating normally? Radio assembly faulty.
Yes
No
Is speaker properly installed? Install properly.
No
Yes
Temporarily install another speaker. Speaker faulty.
Function OK? Yes
No
Radio assembly faulty.
14 Tape Player TAPE JAMMED MALFUNCTION WITH TAPE SPEED OR AUTO-REVERSE
Function OK if different tape (less than 120 mins.) is inserted? Cassette tape faulty.
Yes
No
Is there a foreign object inside tape player? Remove foreign object.
Yes
No
Operates normally after cleaning the heads? Head dirty.
Yes
No
Radio assembly faulty.
2001 SIENNA (RM787U)
Author : Date : 1650
BE-133
BODY ELECTRICAL - AUDIO SYSTEM
15 Tape Player CASSETTE TAPE WILL NOT BE EJECTED
Is tape player operating normally? Cassette tape jammed.
Yes No
Is auto search button of radio operating normally? Radio assembly faulty.
Yes
No
Check if RADIO No.1 fuse is OK? Replace fuse.
NG
OK
Is power supplied to +B terminal of power amplifier? +B wire harness faulty.
No
Yes
Is power supplied to +B terminal of radio receiver? Power amplifier faulty.
No
Yes
Radio assembly faulty.
2001 SIENNA (RM787U)
Author : Date : 1651
BE-134
BODY ELECTRICAL - AUDIO SYSTEM
16 Power Amplifier NO POWER COMING IN
Is tape player operating normally? Radio assembly faulty.
Yes
No
Check if RAD-No.2 fuse is OK? Replace fuse.
NG
OK
Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes
Check if RAD-No.1 fuse is OK? Replace fuse.
OK NG
Is power supplied to +B terminal of power amplifier? + B wire harness faulty.
No
Yes
Check if GND (wire harness side) of power amplifier GND faulty.
grounded normally? NG
OK
Is power supplied to ACC terminal of radio assembly? Power amplifier or wire harness faulty.
No
Yes
Is power supplied to +B terminal of radio assembly? Power amplifier or wire harness faulty.
Yes No
Check if GND (wire harness side) of radio assembly GND faulty.
grounded normally? NG
OK
Radio assembly faulty.
2001 SIENNA (RM787U)
Author : Date : 1652
BE-135
BODY ELECTRICAL - AUDIO SYSTEM
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