radio TOYOTA TERCEL 1996 Service Repair Manual

IN-14
- INTRODUCTIONFOR ALL OF VEHICLES
14 Author
: Date
:
1996 TERCEL (RM440U)
2. FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION:
If large amount of unburned gasoline flows into the converter, it may overheat and create a fire haz-
ard. To prevent this, observe the following precautions and explain them to your customer.
(a) Use only unleaded gasoline.
(b) Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes.
(c) Avoid spark jump test.
(1) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
(2) While testing, never race the engine.
(d) Avoid prolonged engine compression measurement.
Engine compression tests must be done as rapidly as possible.
(e) Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra load on the converter.
(f) Avoid coasting with ignition turned off.
(g) Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
3. IF VEHICLE IS EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
For vehicles with mobile communication systems such as two-way radios and cellular telephones, observe
the following precautions.
(1) Install the antenna as far as possible away from the ECU and sensors of the vehicle's electronic
system.
(2) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the ve-
hicle's electronic systems. For details about ECU and sensors locations, refer to the section on
the applicable component.
(3) Avoid winding the antenna feeder together with other wiring as much as possible, and also avoid
running the antenna feeder parallel with other wire harnesses.
(4) Check that the antenna and feeder are correctly adjusted.
(5) Do not install powerful mobile communications system.
4. FOR USING OBD II SCAN TOOL OR TOYOTA HAND-HELD TESTER
CAUTION:
Observe the following items for safety reasons:

Before using the OBD II scan tool or TOYOTA hand-held tester, the OBD II scan tool's instruc-
tion book or TOYOTA hand-held tester's operator manual should be read thoroughly.

Be sure to route all cables securely when driving with the OBD II scan tool or TOYOTA hand-
held tester connected to the vehicle. (i.e. Keep cables away from feet, pedals, steering wheel
and shift lever.)

Two persons are required when test driving with the OBD II scan tool or TOYOTA hand-held
tester, one person to drive the vehicle and the other person to operate the OBD II scan tool or
TOYOTA hand-held tester.

H09396
MAIN
FL
B
ALT
B-RB-R
2 2
Engine
Room
R/B
AM1
W-GDriver Side J/B
1
1J
1BW-G 2ACC
AM13
B-Y4
1B
1H
CIG/RADIO Driver Side J/B
G-R*1
10
ACCAirbag
Sensor
Assembly
8
*2
B-OIG2 *1
9
7
*2 2
1H 1B5
IGN B-W 6
AM2
Ignition
Switch 7 B-R 12
IC1 B-R
2
AM2
EA2 1
B*1: USA
*2: CANADA EA214
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-177
1996 TERCEL (RM440U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different to other circuits-when the SRS warning
light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.DTC Detection ConditionTrouble Area
(Normal)Source voltage drop.
Battery

Airbag sensor assembly
WIRING DIAGRAM
DI4MI-02

SF1PQ-02
- MFIMFI SYSTEM
MF-1
525 Author
: Date
:
1996 TERCEL (RM440U)
MFI SYSTEM
PRECAUTION
1. BEFORE WORKING ON FUEL SYSTEM, DISCON-
NECT NEGATIVE (-) TERMINAL CABLE FROM BAT-
TERY
HINT:
Any diagnostic trouble code retained by the computer will be
erased when the negative (-) terminal cable is disconnected.
Therefore, if necessary, read the diagnosis before disconnect-
ing the negative (-) terminal cable from the battery.
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME
WHEN WORKING ON THE FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR LEATH-
ER PARTS
4. MAINTENANCE PRECAUTIONS
(a) In event of engine misfire, the following precautions
should be taken.
(1) Check proper connection to battery terminals, etc.
(2) Handle higt-tension cords carefully.
(3) After repair work, check that the ignition coil termi-
nals and all other ignition system lines are recon-
nected securely.
(4) When cleaning the engine compartment, be espe-
cially careful to protect the electrical system from
water.
(b) Precautions when handling the oxygen sensor.
(1) Do not allow the oxygen sensor to drop or hit
against an object.
(2) Do not allow the sensor to come into contact with
water.
5. IF VEHICLE IS EQUIPPED WITH MOBILE RADIO SYS-
TEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication system,
refer to the precaution in the IN section.
6. AIR INDUCTION SYSTEM
(a) Separation of the engine oil dipstick, oil filler cap, PCV
hose, etc. may cause the engine out of tune.
(b) Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head will cause air suction and cause the engine out of
tune.
7. ELECTRONIC CONTROL SYSTEM
(a) Before removing MFI wiring connectors, terminals, etc.,
first disconnect the power by either turning the ignition
switch to LOCK or disconnecting the negative (-) terminal
cable from the battery.

BE0QP-02
- BODY ELECTRICALBODY ELECTRICAL SYSTEM
BE-1
1023 Author
: Date
:
1996 TERCEL (RM440U)
BODY ELECTRICAL SYSTEM
PRECAUTION
Take care to observe the following precautions when performing inspections or removal and replacement
of body electrical related parts.
1. HEADLIGHT SYSTEM
Halogen bulbs have pressurized gas inside and require special handling. They can burst if scratched or
dropped. Hold a bulb only by its plastic or metal case. Don't touch the glass part of a bulb with bare hands.
2. SRS (SUPPLEMENTAL RESTRAINT SYSTEM)
The TERCEL is equipped with an SRS (Supplemental Restraint System) such as the driver airbag and front
passenger airbag. Failure to carry out service operation in the correct sequence could cause the SRS to
unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including re-
moval or installation of parts, inspection or replacement), be sure to read the precautionary notices in the
RS section.
3. AUDIO SYSTEM

If the negative (-) terminal cable is disconnected from the battery, the preset AM, FM 1 and FM 2 sta-
tions stored in memory are erased, so be sure to note the stations and reset them after the terminal
is reconnected.

If the negative (-) terminal cable is disconnected from the battery, the ºANTI-THEFT SYSTEMº will
operate when the cable is reconnected, but the radio, tape player and CD player will not operate. Be
sure to input the correct ID number so that the radio, tape player and CD player can be operated again.
4. MOBILE COMMUNICATION SYSTEM
If the vehicle is equipped with a mobile communication system, refer to precautions in the IN section.

The radio wave bands used in radio broadcasting are as follows:
Frequency
Designation
Radio wave
Modulation method
LF: Low frequency MF: Medium Frequency HF: High Frequency VHF: Very High FrequencyAmplitude modulationFrequency modulation 30 kHz
300 kHz3 MHz 30 MHz 300 MHz
LF
MFHFVHF
AM FM
BE1OT-01
BE2818
FM (Stereo)
FM (Monaural)
AM
BE2819
Fading
Ionosphere
- BODY ELECTRICALAUDIO SYSTEM
BE-53
1075 Author
: Date
:
1996 TERCEL (RM440U)
AUDIO SYSTEM
DESCRIPTION
1. RADIO WAVE BAND
2. SERVICE AREA
There are great differences in the size of the service area for AM
and FM monaural. Sometimes FM stereo broadcasts cannot be
received even through AM comes in very clearly.
Not only does FM stereo have the smallest service area, but it
also picks up static and other types of interference (ºnoiseº)
easily.
3. RECEPTION PROBLEMS
Besides the problem of static, there are also the problems
called ºfadingº, ºmultipathº and ºfade outº. These problems are
caused not by electrical noise but by the nature of the radio
waves themselves.

Fading
Besides electrical interference, AM broadcasts are
also susceptible to other types of interference, es-
pecially at night. This is because AM radio waves
bounce off the ionosphere at night. These radio
waves then interfere with the signals from the same
transmitter that reach the vehicle's antenna directly.
This type of interference is called ºfadingº.

BE2820
Multipath
BE2821
Fade Out
N17398
Example :
HeadCapstan
Pinch Roller BE-54
- BODY ELECTRICALAUDIO SYSTEM
1076 Author
: Date
:
1996 TERCEL (RM440U)

Multipath
One type of interference caused by bouncing of ra-
dio waves off obstructions is called ºmultipathº. Mul-
tipath occurs when a signal from the broadcast
transmitter antenna bounces off buildings and
mountains and interferes with the signal that is re-
ceived directly.

Fade Out
Because FM radio waves are of higher frequencies
than AM radio waves, they bounce off buildings,
mountains, and other obstructions. For this reason,
FM signals often seem to gradually disappear or
fade away as the vehicle goes behind a building or
other obstructions. This is called ºfade outº.
4. Tape Player/Head Cleaning:
MAINTENANCE
(a) Raise the cassette door with your finger.
Next, using a pencil or similar object, push in the guide.
(b) Using a cleaning pen or cotton applicator soaked in clean-
er, clean the head surface, pinch rollers and capstans.

BE26T-01
- BODY ELECTRICALAUDIO SYSTEM
BE-55
1996 TERCEL (RM440U)
TROUBLESHOOTING
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 is 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.

Open or short circuit of the wire harness

Connector or terminal connection fault
ProblemNo.
RadioNo power coming in.1
Power coming in, but radio not operating.2
Noise present, but AM - FM not operating.3
Either speaker does not work.4
Either AM or FM does not work.5
Reception poor (Volume faint).5
Few preset tuning bands.5
Sound quality poor.6
Cannot set station select button.7
Preset memory disappears.7
Tape PlayerCassette tape cannot be inserted.8
Cassette tape inserts, but no power.9
Power coming in, but tape player not operating.10
Either speaker does not work.11
Sound quality poor (Volume faint).12
Tape jammed, malfunction with tape speed or auto-reverse.13
APS, SKIP, RPT buttons not operating.14
Cassette tape will not eject.15
AntennaAntenna dose not fully extend or fully retract.16
Antenna - related.17
NoiseNoise produced by vibration or shock while driving.18
Noise produced when engine starts.19
The term ºAMº includes LW, MW and the term ºFMº includes UKW.

V08170
HOW TO USE DIAGNOSTIC CHART
Reference:
NO POWER COMING IN 1 Radio
R
SUR
SU
SU
R
SUR
U
: Radio : Tape Player (Separate) : Radio - Tape Player Unit
Tape player faulty.
Check if GND (wire harness side)
to radio is OK. Is tape player operating normally?
Is ACC applied to radio?Ye s
No
OKNG No
Ye s
NG
OK
Ye s Check if CIG & RAD fuse is OK.
Replace fuse.
Audio system type and symbol used.
HINT : Confirm the applicable type of audio system.Radio faulty.
Radio assembly faulty.
ACC wire harness faulty. R Is ACC applied to radio?
S Is ACC applied to tape player?
P Is ACC applied power amplifier?No
Symbol for type of audio system the question applies to.
HINT : If the audio system type is not applicable, proceed to next question below.
Junction without black circle.
HINT : Proceed to next question below.
Junction with black circle.
HINT : Proceed to question for applicable audio system type.
HINT : Select question for applicable audio system type.
2
3
4
51RS BE-56
- BODY ELECTRICALAUDIO SYSTEM
1996 TERCEL (RM440U)

V08171
NO POWER COMING IN 1 Radio
R
UR
U: Radio : Radio - Tape Player Unit
R
UU
Ye s
No
OKNG
No
Ye s
OKNG
U Check if GND (wire harness side) to radio assembly is OK.Is tape player operating normally? Radio assembly faulty.
Check if CIG & RAD fuse is OK.Replace fuse.
R Radio faulty.
U Radio assembly faulty. R Is ACC applied to radio?
C Is ACC applied to radio assembly?AC wire harness faulty.
R Check if GND (wire harness side) to radio is OK.
GND faulty.
- BODY ELECTRICALAUDIO SYSTEM
BE-57
1996 TERCEL (RM440U)

V08173
U: Radio - Tape Player Unit
R : Radio
U
U RYe s
Ye s
Ye s
Ye s No
No
NoNo EITHER SPEAKER DOES NOT WORK 4 Radio
R Radio faulty.
U Radio assembly faulty.
R Radio faulty.
U Radio assembly faulty.U Radio assembly faulty. Is tape player operating normally?
Is hiss produced by non-functioning speaker?
Is there continuity in speaker wire harness?
Temporarily install another speaker.
Functions OK?Speaker wire harness faulty.
Speaker faulty.
- BODY ELECTRICALAUDIO SYSTEM
BE-59
1996 TERCEL (RM440U)