Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne be audsy trou
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BE-122
BODY ELECTRICAL - AUDIO SYSTEM
BE244-01
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
"6" button
"1" button
I21741
(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".
2002 4RUNNER (RM887U)
Author : Date : 1590
BE-123
BODY ELECTRICAL - AUDIO SYSTEM
S nrES:
No response is identified to the "System Check Start Instruction" and "Request for System
Check Result" commands.
HINT:
S Check the present and past condition of components by performing the System Check and collecting
stored DTC memories.
S Check results shall be displayed as one of six following indications: "good", "ECHn", "CHEC","nCon",
"Old" or "nrES".
2002 4RUNNER (RM887U)
Author : Date : 1591
BE-124
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.
2002 4RUNNER (RM887U)
Author : Date : 1592
BE-125
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.
2002 4RUNNER (RM887U)
Author : Date : 1593
BE-126
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
2002 4RUNNER (RM887U)
Author : Date : 1594
BE-127
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.
2002 4RUNNER (RM887U)
Author : Date : 1595
BE-128
BODY ELECTRICAL - AUDIO SYSTEM
2. DIAGNOSIS CODE LIST
Terms Meaning
Three-digit code (shown in hexadecimal) which is given to each component com-
Physical address
prising the AVC-LAN.
Corresponding to the function, individual symbols are specified.
Logical address Two-digit code (shown in hexadecimal) which is given to each function comprising
the inner system of the AVC-LAN.
(a) Physical address: 190 Radio receiver assembly
HINT:
S *1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for
starting an engine.
S *2: It is stored when 180 sec. has passed after the power supply connector is pulled out after engine
start.
S *3: It may be stored when the engine key is turned 1 min. again after engine start.
S *4: It may be stored when the engine key is turned again after engine start.
S *5: When 210 sec. has passed after pulling out the power supply connector of the master component
with the ignition switch in ACC or ON, this code is stored.
(1) Logical address: 01 (Communication control)
DTC Diagnosis item Diagnosis content Countermeasure and inspected parts
D6 Absence of Master Component in which this code is recorded S Check harness for power supply system of
*1 has been disconnected from system with multi-display.
ignition in ACC or ON. Or, when this code S Check harness for communication system
was recorded, multi-display assembly was of multi-display.
disconnected. S Check harness for power supply system of
radio and player.
S Check harness for communication system
of radio and player.
D8 No Response to Connection Check Component shown by auxiliary code is or S Check harness for power supply system of
*2 had been disconnected from system after component shown by auxiliary code.
engine is start. S Check harness for communication system
D9 of component shown by auxiliary code.
D9 Last Mode Error Component operated (sounds and/or S Check harness for power supply system of
*1 images were provided) before engine stop is component shown by auxiliary code.
or has been disconnected with ignition S Check harness for communication system
switch in ACC or ON. of component shown by auxiliary code.
DA No Response to ON/OFF Instruction No response is identified when changing S Check harness for power supply system of
mode (audio and visual mode change). component shown by auxiliary code.
Detected when sound and picture does not S Check harness for communication system
change by button operation. of component shown by auxiliary code.
S If error occurs again, replace component
shown by auxiliary code.
DB Mode Status Error Dual alarm is detected. S Check harness for power supply of compo-
*1 nent shown by auxiliary code.
S Check harness for communication system
of component shown by auxiliary code.
DC Transmission Error Transmission to component shown by auxil- If same auxiliary code is recorded in order
*3 iary code has been failed. component, check harness for power supply
(Detecting this DTC does not necessarily and communication system of all compo-
mean actual failure.) nents shown by code.
2002 4RUNNER (RM887U)
Author : Date : 1596
BE-129
BODY ELECTRICAL - AUDIO SYSTEM
DD Master Reset (Momentary Interruption) After engine is started, multi-display assem- S Check harness for power supply system of
*4 bly was disconnected from system. multi-display.
S Check harness for communication system
of multi-display.
S Check harness for power supply system of
radio and player.
S Check harness for communication system
of radio and player.
S If this error occurs frequently, replace mul-
ti-display assembly.
DE Slave Reset (Momentary Interruption) After engine is started, slave component S Check harness for power supply of compo-
*4 was disconnected from system. nent shown by auxiliary code.
S Check harness for communication system
of component shown by auxiliary code.
DF Master Error Due to defective condition of component S Check harness for power supply of multi-
*5 with a display, master function is switched to display assembly.
audio equipment. S Check harness for communication system
Error occurs in communication between of multi-display assembly.
sub-master (audio) and master component. S Check harness for communication system
between multi-display assembly and sub-
master component.
E0 Registration Completion Instruction Error "Registration Completion Instruction" com- Since this DTC is provided for engineering
*1 mand from master cannot be received. purpose, it may be detected when no actual
failure exists.
E1 Audio processor ON error While source equipment is operating, AMP S Check harness for power supply of multi-
*1 output is stopped. display assembly.
S Check harness for communication system
of multi-display assembly.
E2 ON/OFF Instruction Parameter Error Error occurs in ON/OFF controlling com- Replace multi-display assembly.
mand from multi-display assembly.
E3 Registration Request Transmission Registration Request command is output Since this DTC is provided for engineering
*1 from slave component. purpose, it may be detected when no actual
Receiving Connection Check Instruction, failure exists.
Registration Request command is output
from sub-master component.
E4 Multiple Frame Abort Multiple frame transmission is aborted. Since this DTC is provided for engineering
*1 purpose, it may be detected when no actual
failure exists.
(2) Logical address: 61 (Cassette switch)
DTC Diagnosis item Diagnosis content Countermeasure and inspected parts
40 Mechanical of Media Error Malfunction due to mechanical failure is S Inspect cassette tape.
identified. S Replace radio and player.
Or cassette tape is cut or entangled.
(3) Logical address: 62 (CD player)/63 (CD Auto chager)
DTC Diagnosis item Diagnosis content Countermeasure and inspected parts
42 No Disc Readout Disc cannot be read Inspect CD.
44 CD Error Error is detected in CD player. Replace radio receiver assembly.
51 Eject Error CD cannot be ejected. Replace radio receiver assembly.
Scratches or dirt is found on CD surface or
46 Scratched/Reversed Disc Inspect CD.
CD is set upside down.
2002 4RUNNER (RM887U)
Author : Date : 1597
BE-130
BODY ELECTRICAL - AUDIO SYSTEM
(b) Physical address: 440 Stereo component amplifier
HINT:
S *1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for
starting an engine.
S *2: It may be stored when the engine key is turned 1 min. again after engine start.
S *3: It may be stored when the engine key is turned again after engine start.
S *4: When 210 sec. has passed after pulling out the power supply connector of the master component
with the ignition switch in ACC or ON, this code is stored.
Logical address: 01 (Communication control)
DTC Diagnosis item Diagnosis content Countermeasure and inspected parts
D6 Absence of Master Component in which this code is recorded S Check harness for power supply of radio
*1 has been disconnected from system with and player.
ignition in ACC or ON. Or, when this code S Check harness for communication system
was recorded, multi-display assembly was of radio and player.
disconnected. S Check harness for power supply of stereo
component amplifier.
S Check harness for communication system
of stereo component amplifier.
D7 Communication Check Error Component in which this code is recorded is S Check harness for power supply of radio
or was disconnected from system after en- and player.
gine start. Or, when recording this code, S Check harness for communication system
multi-display assembly was disconnected. of radio and player.
S Check harness for power supply of stereo
component amplifier.
S Check harness for communication system
of stereo component amplifier.
DC Transmission Error Transmission to component shown by auxil- If same auxiliary code is recorded in order
*2 iary code has been failed. component, check harness for power supply
(Detecting this DTC does not necessarily and communication system of all compo-
mean actual failure.) nents shown by code.
DD Master Reset (Momentary Interruption) After engine is started, multi-display assem- S Check harness for power supply of radio
*3 bly was disconnected from system. and player.
S Check harness for communication system
of radio and player.
S Check harness for power supply of stereo
component amplifier.
S Check harness for communication system
of stereo component amplifier.
S If this error occurs frequently, replace mul-
ti-display assembly.
DF Master Error Due to defective condition of component S Check harness for power supply of multi-
*4 with a display, master function is switched to display assembly.
audio equipment. S Check harness for communication system
Error occurs in communication between of multi-display assembly.
sub-master (audio) and master component. S Check harness for communication system
between multi-display assembly and sub-
master component.
E0 Registration Completion Instruction Error "Registration Completion Instruction" com- Since this DTC is provided for engineering
*1 mand from master cannot be received. purpose, it may be detected when no actual
failure exists.
E1 Audio processor ON error While source equipment is operating, AMP S Check harness for power supply of multi-
*1 output is stopped. display assembly.
S Check harness for communication system
of multi-display assembly.
2002 4RUNNER (RM887U)
Author : Date : 1598
BE-131
BODY ELECTRICAL - AUDIO SYSTEM
E2 ON/OFF Instruction Parameter Error Error occurs in ON/OFF controlling com- Replace multi-display assembly.
mand from multi-display assembly.
E3 Registration Request Transmission S Registration Request command is output Since this DTC is provided for engineering
*1 from slave component. purpose, it may be detected when no actual
S Registration Connection Check Instruction, failure exists.
Registration Request command is output
from sub-master component.
(c) Physical address: 360 CD Auto Changer
HINT:
S *1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for
starting an engine.
S *2: It may be stored when the engine key is turned 1 min. again after engine start.
S *3: It may be stored when the engine key is turned again after engine start.
S *4: It may be stored when the engine key is turned again after engine start.
S *5: When 210 sec. has passed after pulling out the power supply connector of the master component
with the ignition switch in ACC or ON, this code is stored.
Logical address: 01 (Communication control)
DTC Diagnosis item diagnosis content Countermeasure and inspected parts
21 ROM Error Abnormal condition of ROM is detected. Replace CD auto changer.
22 RAM Error Abnormal condition of ROM is detected. Replace CD auto changer.
D6 Absence of Master Component in which this code is recorded is S Check harness for power supply system of
*2 or was disconnected from system after en- multi-display.
gine start. Or, when recording this code, S Check harness for communication system
multi-display assembly was disconnected. of multi-display.
S Check harness for power supply system of
CD auto changer
S Check harness for communication system
CD auto changer
D7 Connection check Error Component in which this code is recorded is S Check harness for power supply of multi-
*5 or was disconnected from system after en- displaly.
gine start. Or, when recording this code, S Check harness for communication system
multi-display assembly was disconnected. of multi-display.
S Check harness for power supply of CD
auto changer.
S Check harness for communication system
of CD auto changer.
DC Transmission Error Transmission to component shown by auxil- If same auxiliary code is recorded in order
*2 iary code has been failed. component, check harness for power supply
(Detecting this DTC does not necessarily and communication system of all compo-
mean actual failure.) nents shown by code.
2002 4RUNNER (RM887U)
Author : Date : 1599
BE-132
BODY ELECTRICAL - AUDIO SYSTEM
DD Master Reset (Momentary Interruption) After engine is started, multi-display assem- S Check harness for power supply system of
*3 bly was disconnected from system. multi-display.
S Check harness for communication system
multi-display.
S Check harness for power supply system of
CD auto changer.
S Check harness for communication system
CD auto changer.
S If this error occurs frequently, replace mul-
ti-display assembly.
DF Master Error Due to defective condition of component S Check harness for power supply of multi-
*4 with a display, master function is switched to display assembly.
audio equipment. S Check harness for communication system
Error occurs in communication between of multi-display assembly.
sub-master (audio) and master component. S Check harness for communication system
between multi-display assembly and sub-
master component.
E0 Registration Completion Instruction Error "Registration Completion Instruction" com- Since this DTC is provided for engineering,
*1 mand from master cannot be received. it may be detected when no actual failure
exists.
E2 ON/OFF Instruction Parameter Error Error occurs in ON/OFF controlling com- Replace multi-display assembly.
mand from multi-display assembly.
E3 Registration Request Transmission S Registration Request command is output Since this DTC is provided for engineering
*1 from slave component. purpose, it may be detected when no actual
S Receiving Connection Check Instruction, failure exists.
Registration Request command is output
from sub-master component.
E4 Multiple Frame Abort Multiple frame transmission is aborted. Since this DTC is provided for engineering
*1 purpose, it may be detected when no actual
failure exists.
2002 4RUNNER (RM887U)
Author : Date : 1600
BE-133
BODY ELECTRICAL - AUDIO SYSTEM
3. PROBLEM SYMPTOMS 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 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 be ejected. 15
CD Player CD cannot be inserted. 16
CD inserted, but no power. 17
Power coming in, but CD player not operating. 18
Sound jumps. 19
Sound quality poor (Volume faint). 20
Any speaker does not work. 21
CD will not be ejected. 22
Power Amplifier No power coming in. 23
Power coming in, but power amplifier not operating. 24
Any speaker does not work. 25
Noise Noise occurs 26
Noise produced by vibration or shock while driving. 27
Noise produced when engine starts. 28
The term "AM" includes LW, MW and SW, and the term "FW" includes UKW.
2002 4RUNNER (RM887U)
Author : Date : 1601
BE-134
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 ACC fuse is OK? Replace fuse.
NG
OK
Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes
Check if DOME 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 is 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.
2002 4RUNNER (RM887U)
Author : Date : 1602
BE-135
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 ACC fuse is OK? Replace fuse.
OK NG
Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes
Check if 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 is 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.
2002 4RUNNER (RM887U)
Author : Date : 1603
BE-136
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.
2002 4RUNNER (RM887U)
Author : Date : 1604
BE-137
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.26
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.
2002 4RUNNER (RM887U)
Author : Date : 1605
BE-138
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.
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 continuity of the antenna cord OK? Replace the antenna cord.
Yes No
Check the grounding of the antenna, antenna cord. Grounding failure.
NG
OK
Does the condition get better by replacing the Replace the antenna cord.
antenna cord? Yes
No
Exchange the glass.
2002 4RUNNER (RM887U)
Author : Date : 1606
BE-139
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 DOME 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.
2002 4RUNNER (RM887U)
Author : Date : 1607
BE-140
BODY ELECTRICAL - AUDIO SYSTEM
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