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110BODY ELECTRICALÐACCESSORIES
Panic Alarm Operation
When the ªpanicº switch of the transmitter is pushed, the theft deterrent system sounds the horns and flaashes the
headlights and taillights. To stop the alarm of the theft deterrent system that was triggered through this operation, push
the transmitter's ªunlockº switch or ªpanicº switch again.
Operation Verification Light Function
When the doors are locked by the transmitter switch
operation, the parking light and taillight flashes
once to confirm that the operation has been
completed.
Similarly, the parking light and taillight flashes
twice when the doors are unlocked.Light Flash Patterns
Transmitter Recognition code Registration Function
As in the '96 Avalon, the recognition code for each transmitter is registered in an EEPROM contained in the wieless
door lock ECU. Up to 2 different recognition codes can be resistered in teh EEPROM. The procedure for registering
a registration code is the same as that used in the '96 Avalon.
For details of the rrecogition code registration procedure, refer to the 1997 Camry Repair Manual (Pub. No.
RM503U).
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SRS AIRBAG
1. General
The SRS (Supplemental Restraint System) airbag is designed to help lessening the shock to the driver and front
passenger as a supplement to the seat belt. In a collision, the aribag sensor detects the shock and if the front±to±rear
shock is greater than a specified value, the airbags stored in the steering wheel pad for the driver and above the glove
box for the front passenger inflate instantly to help reducing the likelihood of the driver's or front passenger's head
and chest directly hitting the steering wheel or instrument panel.
As in the '96 Avalon, a 1±sensor type airbag system is used, in chich the detection of deceleration during a collision
is accomplished by the airbag sensor enclosed in the airbag snesor assembly.
The airbag system is controlled by the airbag sensor assembly. It has a self±diagnosis function. When it detects a
system malfunction, it lights up the SRS warning light on the combination meter to alert the driver.
The basic construction and operation are the same as in teh '96 Avalon. However, 2 types of the inflator for front
passenger have been adopted in the new Camry: TRW made and Morton made. Also, the construction of airbag sensor
assembly has been changed.
System Diagram
The activation processes of the SRS airbag is as illustrated below.
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2. Layout of Components
The major function of the airbag system are shown below.
3. Wiring Diagram
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4. construction and Operation
Inflator and Bag for Front Passenger
1) General
The inflator and ag for front passenger are inserted inside the case, and located in the passenger side instrument panel.
the bag is made of strong nylon cloth, and becomes inflated by the argon gas flowed from the inflator. Also, 2 types
of the inflator for front passenger have been adopted: TRW made and Morton made.
2) Inflator of TRW Made
The inflator of TRW made is comprised of a squib, propellant grain, burst cup and high pressure argon gas.
If the airbag sensor is turned on by deceleration due to frontal collision, electric current then ignites the squib located
in the inflator. the frame of squib spreads instaneously to the propellant grain. If the internal pressure of the burst cup
increases by the combustion of the propellant grain, the burst cup will be released by making its bulkhead break. With
this, the gas which expanded by the tgeat of the ignition of the propellant grain flows into the airbag via the diffuser,
thus inflating the airbag.
Construction
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Operation
3) Inflator of Morton Made
The inflator of Morton made is comprised of a squib, projectile, orifice disk, propellant grain, hight pressure argon
gas and etc.
If the airbag sensor is turned on by deceleration due to frntal collision, electric current then ignites the squib located
in the inflator. The projectile which fired by the ignition of the squib pierces through the orifice disk and collides with
the action piston, which causes the primer to ignite. The flame wo the primer spreads instantaneously to the ignition
booser and to the propellant grain. The gas which expanded by the heat of the ignition of the propellant grain flows
into the airbag via the gas release hole, thus inflating the airbag.
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Construction
Operation
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CRUISE CONTROL SYSTEM
1. General
Once the system is set to a desired vehicle speed, the engine throttle position is adjusted automatically to maintain
the vehicle speed at that speed without depressing the accelerator pedal.
The basic sonstruction and operation of this system are the same as the previous model. However, on the new model,
the control method for the manual and auto cancel functions have been changed. Also, a new motor type actuator
that is both lightweight and simple in construction has been adopted.
2. Construction and Operation
Actuator
The new Camry has adopted a new motor type actuator. The new motor type actuator consists of a motor, control link
and limit swit h, etc. as shown belwo.
The potentiometer hat measured the opening angle of the control link and transmitted the signals to the cruise control
ECU has been discontinued in the new actuator. The new actuator is equipped it with a compact motor. As a result,
the new actuator is made both lightweight and simple in construction.
Without the potentiometer, the new actuator contnuously regulates the opening angle of the control link.
This is made possible by the ECU, which compares the curent vehiclespeed input with the desired vehicle speed that
is stored in memory, and the result of that comparison is transmitted to the actuator.
Cruise Control ECU
1) Manual Cancel Fucntion
The manual cancel function has been changed as follows:
New
Previous
Transaxle shifted to positions other than ªDº.Transaxle shifted to ªNº position.
ÐPull up the parking brake lever.
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2) Auto Cancel Function
When the vehicle is being driven under cruise control, if any of th econditions listed below is present, the vehicle speed
stored in membor is deleted, the control is lifetd, the current to the actuator is disrupted, and th power indicator ligh
is made to flash. The methods to reactivate the cruise control at that time, in accordance with that particular condition
(malfunction category A or B), are classified in the chart below.
Other auto cancel functions are basically the same as those of the previous model.
Condition
Malfunction CategoryHow to reactivate
Continuous current applied to the motor's accel-
eration output.
The motor did not move.
A
Turn off the ignition switch, and
turn it back on. Then turn on the
main switch.
Excessive current flowed to the motor or
magnetic clutch drive transistor.
Open circuit in magnetic clutch.
The vehicle speed signal is not sent for a
predetermined period of time (approx. 140 msec.)
The vehicle speed is equal to the set speed minus
approximately 16 km/h (10 mph) or below.
Short circuit in the control switch.
An open circuit malfunction of the ªdecreaseº
side of the motor (including open circuit in the
motor).
Abnormal vehicle speed signal.
BTurn the main switch back on.
3) Diagnosis Function
a. Wawrning Indication
The cruise control ECU immediately blinks the power indicator light in the combination meter on and off repeatedly
to alert the driver of a system malfunction.
When the power indicator light is flashing, and the cruise control is released by pressing on the main switch, the power
indicator light will be turned off. When the main switch is turned back on, the power indicator light blinking pattern
as shown on the next page outputs according to the malfunction categories A or B. When a category A malfunction
is occuring, the power indicator ligh will flash again. This indicates that the system cannot operate. But if it is a
category B malfunction, the indicator light will remain on indicating that the system is operating.