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2 GENERAL 1999 FEATURES
GENERAL 1999 FEATURES
DESCRIPTION
The table below provides an outline of the system that is indicated in the General 1999 Features and the names
of the '99 models that have adopted this system.
System Outline Model Name
A service port for inspecting the evaporative
Emission
emission control system has been provided
Engine Control All Models
between the charcoal canister and the VSV
System
for EVAP.
A front airbag sensor that detects the impact
Models except
SRS Airbag of a frontal collision has been newly added
Tercel and Paseo
to realize a 3-sensor type airbag system.
A seat belt warning system for the front
Accessories
Seat Belt passenger has been provided to inform that Tercel*, Paseo*
Warning the seat belt is not being worn if the front Camry Solara, Sienna
System passenger is seated but is not wearing the 4Runner, Land Cruiser
seat belt.
The AVC-LAN (Audio Visual Communica-
tion - Local Area Network) standard has
been adopted by the audio system. Thus, the
Audio AVC-LAN All Models*
system's expandability has been improved
by facilitating the interchange or the addi-
tion of audio system units.
*: This feature has been adopted starting on the '98 model.
GENERAL 1999 FEATURES 3
ENGINE
JEMISSION CONTROL SYSTEM
A service port for inspecting the evaporative emission control system has been provided between the charcoal 1
canister and the VSV for EVAP.
The evaporative emission control system can be inspected by connecting a pressure gauge to the service port
and performing a vacuum or a pressure test.
Refer to the repair manual for the respective model for details on the check method.
VSV
(for EVAP) Service Port
Charcoal Fuel Tank
Canister
Intake Air Chamber
159EG07
4 GENERAL 1999 FEATURES
ACCESSORIES
J SRS AIRBAG
1. General
D The electrically sensing type SRS (Supplemental Restraint System) airbag is designed to help lessen the
shock to the driver and front passenger as a supplement to the seat belt.
D A 3-sensor type airbag system detects the deceleration during collision by the front airbag sensors and the
airbag sensor that is enclosed in the airbag sensor assembly.
148BE114
Corolla
" System Diagram _
The activation processes of the SRS airbag is as illustrated below.
Inflator
Airbag Sensor Squib
Assembly
Power Safing Gas
Gas
Generator
Source Sensor
Bag
Inflator (For Driver)
Airbag Sensor
Initiator
Collision Impact
Front Airbag
Sensors Gas Gas
Bag
To Seat Belt (For Front
Pretensioner Passenger)
160GE07
GENERAL 1999 FEATURES 5
2. Layout of Components
The major function parts of the airbag systems are shown below.
1
Right Side Front
Airbag Sensor Inflator and Bag for
SRS Warning Light Front Passenger
(Above the Glove Box)
Left Side Front
Airbag Sensor
Inflator and Bag for Driver
(In Steering Wheel Pad)
Airbag Sensor Assembly
148BE16
Corolla
3. Wiring DIagram
SRS Warning Light
Back-Up
Power
Source DLC1
DC-DC
Converter
Safing
Sensor
Squib (For Driver)
Front Airbag
Sensor (RH) Drive
Circuit
Drive
Circuit Initiator
Battery CPU (For Front
Drive Passenger)
Circuit
Drive
Front Airbag Circuit
Sensor (LH) Airbag Spiral Cable
Sensor
DLC3
Airbag Sensor Assembly
To Seat Belt
Pretensioner
160GE04
6 GENERAL 1999 FEATURES
4. Construction and Operation
Front Airbag Sensor
The front airbag sensor consists of rotor, movable contact point and a stationary contact point.
The rotor is fixed by the initial set load of the movable contact point. At the same time, the movable contact
point restrains the movement of the rotor which is generated during vehicle deceleration, thus preventing
the unintended activation of the system.
If a sudden deceleration that exceeds a predetermined value occurs due to a collision of the vehicle, the rotor
will rotate. The rotational movement of the rotor pushes the movable contact point and causes the movable
and stationary contact points to come into contact. As a result, an ON signal is generated and transmitted
to the airbag sensor assembly.
Deceleration
Rotor
Movable
Contact
Stationary Point
Contact Point
160GE05 160GE06
Normal Condition Activated Condition
5. System Operation
Ignition Judgement and Condition
D When the vehicle collides in the hatched area (Fig. 1) and the shock is larger than a predetermined level,
the airbag and the seat belt pretensioner are activated automatically. The airbag sensor is characteristically
turned in such a way that can judge the need for ignition in collisions within the hatched area.
D The safing sensor is designed to be activated by a smaller deceleration rate than that of the airbag sensor.
As illustrated in Fig. 2 below, ignition is operated when current flows to the squib. This happens when a
safing sensor and the airbag sensor go on simultaneously.
D Airbag sensor assembly judges whether or not to inflate the airbag in accordance with ON/OFF of the front
airbag sensor and the deceleration detected by the airbag sensor.
Front Airbag
Sensor ON / OFF
Safing Sensor
ON
AND Ignition
Airbag Sensor
ON
148BO127
Corolla Range of Operation
141BE65
Fig. 1 Fig. 2
GENERAL 1999 FEATURES 7
JSEAT BELT WARNING SYSTEM
1. General
1
A seat belt warning for the front passenger has been newly provided. When the front passenger seat is occu-
pied but its seat belt is not being worn, this function flashes a warning light to inform the front passenger that
the seat belt is not being worn.
2. Seat Belt Warning for Front Passenger
Construction
The seat belt warning for the front passenger consists of the front passenger seat belt buckle/retractor
switch, occupant detection sensor, seat belt warning light for the front passenger.
1) Belt Warning Occupant Detection Sensor
The occupant detection sensor, which is enclosed in the seat cushion of the front passenger seat, is used
to detect whether or not the front passenger seat is occupied.
This sensor, which is shaped as illustrated below, consists of a construction in which two sheets of elec-
trodes sandwich a spacer. When the occupant is seated, the electrode sheets come in contact with each
other through the hole that is provided in the spacer portion, thus enabling the current to flow.
Thus, the sensor detects whether or not an occupant is seated in the front passenger seat.
Spacer Electrode Sheet
Occupant
Detection Sensor
Electrode Sheet
156BE19
Sensor OFF
Occupant
Front Passenger Seat
156BE18
Land Cruiser
156BE20
Sensor ON
8 GENERAL 1999 FEATURES
2) Front Passenger Seat Belt Buckle/Retractor Switch
The front passenger seat belt buckle/retractor switch is enclosed in the seat belt buckle/retractor of the
front passenger seat to detect whether or not the seat belt for the front passenger is being worn.
3) Seat Belt Warning Light for Front Passenger
The seat belt warning light for front passenger flashes to warn if the front passenger does not have the
seat belt buckled.
Warning Light for
Front Passenger
156BE14
Land Cruiser
Operation
When an occupant is seated in the front passenger seat, the occupant detection sensor activates, thus enab-
ling the system to recognize that the occupant has seated. When the ignition switch is turned ON, a warning
light flashes if the front passenger is not wearing the seat belt. The warning light continues to flash until
the front passenger wears the seat belt.
If the front passenger seat is not occupied, the warning light remains extinct regardless of the condition of
the seat belt.
GENERAL 1999 FEATURES 9
AUDIO
JAVC-LAN
1. General
1
The AVC-LAN (Audio Visual Communication - Local Area Network) is a communication standard that has
been established by the 6 audio manufacturers that produce audio visual units, which are mounted on Toyota's
production vehicles. This standard, which ensures the mutual interchangeability of the manufacturers' units,
facilitates the connection and control of those units.
The characteristics of an audio system that supports AVC-LAN are described below.
D An audio system can be created by selecting the units regardless of the audio unit's manufacturer.
D The audio system that was installed in the factory can be freely interchanged or added with commercially
available audio units.
D Because this standard enables the manufacturers to develop and produce the audio unit of their specialty,
a wide variety of products can be provided in the audio lineup.
D The audio units that are newly developed by the manufacturers can be added to the lineup in a timely man-
ner.
D By pre-registering the switch operation of each unit established in the line up into the head unit, each unit
can be controlled by the head unit without adding the transmitter when adding units later.
By adopting the audio system corresponded to the AVC-LAN standard, audio units can be easily added or
changed with the audio system mounted originally on the vehicle as the base. Thus, the expandability of the
audio system is improved.
10 GENERAL 1999 FEATURES
2. Communication Outline
In the audio system that uses AVC-LAN, audio units such as a cassette deck or a CD changer are connected
by a communication bus that establishes communication via serial data signals.
In this system, addresses are used to identify the units with which to establish communication. The addresses
can be broadly divided into two types: the physical address that is assigned to each audio unit such as a cas-
sette deck, CD changer, etc.; and the logical address that is assigned to the function that each unit provides,
such as the radio function or the cassette function. The physical addresses are represented by 3-digit numbers
and the logical addresses are represented by 2-digit numbers.
The signals that are exchanged between the units are the unit's control signal, display data, audio signal, etc.,
which have been rendered into serial data. The configuration of the 4 signals indicated below, which are ren-
dered into serial data and transmitted to the each unit, has been established as a uniform AVC-LAN standard.
D Audio Signal
D Video Signal
D Display Data
D Signal Communication Software
The illustration below shows an example of an audio system configuration using AVC-LAN.
Communication Bus CD Changer
Radio and Cassette Deck
Physical Address : 190 Physical Address: 240
Logical Address : 11 (Mode Control) Logical Address: 43
25 (Command Switch)
60 (Radio Tuner)
61 (Cassette Deck)
160GE01
3. Operation
System Registration
An audio system that uses AVC-LAN performs a registration process to verify the audio units that comprise
the system.
When the ignition switch is turned to the ACC position, the audio units that comprise the system transmit
the logic address in the units, and the physical address is transmitted by the mode control portion that is
integrated in the smallest audio unit (head unit). By receiving these addresses, the mode control portion veri-
fies the units that comprise the system.
By performing this process, all functions can be controlled regardless of the combination of the units that
comprise the system.
GENERAL 1999 FEATURES 11
Switching the System
An audio system that uses AVC-LAN consists of audio units that are connected in parallel as described in
Fig. 1. Each of the audio units has a switch to connect the unit to the communication bus. 1
To control the audio units in accordance with the system to be operated, the mode control portion transmits
output ON and output OFF instructions. In accordance with the instruction signals transmitted by the mode
control portion, the units turn their switches ON or OFF to switch the operating unit and system. Fig. 2 shows
an example of a signal exchange that takes place between the mode control unit and each audio unit during
the switching of the system.
MUTE
Sound CD
VOL Changer
74 IC 43
IC IC (Shielded)
Power Amplifier
Power Supply
Control Cassette Radio
61 60
160GE02
Fig. 1
Command
Mode Control Volume Cassette Radio CD Changer
Switch
CD Play Notice
(Press Switch) Output ON Request
OFF
Output ON Instruction
Output ON Verification
CD Output ON Instruction CD ON
Output ON Verification
Amplifier Power
Supply ON
AMrFM Power On Notice
(Press Switch) Output ON Request
Output OFF Instruction
Output OFF Verification
Output ON Instruction CD OFF
Output ON Verification
Radio
Radio ON
Fig. 2
160GE03
12 GENERAL 1999 FEATURES
4. Diagnosis Function
A diagnostic function that comprises the following 3 functions has been adopted.
D A LAN check mode that displays the code number (physical address) of the tuner and connected equip-
ment.
D A system check mode that displays the malfunction judgment of the tuner and connected equipment and
its results.
D A diagnosis memory mode that displays the malfunction judgment of the tuner and connected equipment
and its results.
For further details on diagnosis function, see the Toyota Service Bulletin (Ref. No. BE-8008).
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