warning lights TOYOTA CAMRY V20 1986 Service Information

Fusible link blown
Headlight control relay faulty
Light control/dimmer switch faulty
Daytime running light relay faulty
(CANADA)
Headlight dimmer relay faulty
(CANADA)
Wiring or ground faulty
Replace fuse and check for short
Replace fusible fink
Check relay
Check switch
Check relay
Repair as necessary TAIL fuse blown
Fusible link blown
Taillight control relay faulty
Light control switch faulty
Daytime running light relay faulty
(CANADA)
Wiring or ground faulty Light control/dimmer switch faulty
Daytime running light relay faulty
(CANADA)
Headlight dimmer relay faulty
(CANADA)
Wiring or ground faultyReplace fusible link
Check relay
Check switch
Check relay
Check relay
Repair as necessary
Replace fuse and check for short
Check flasher
Check switch
Repair as necessary
Replace fuse and check short
Check flasher
Check switch
Repair as necessary HAZ±HORN fuse blown
Turn signal flasher faulty
Hazard warning switch faulty
Wiring or ground faultyCheck switch
Check relay
Check relay
Repair as necessary
Replace fuse and check for short
Adjust or replace switch
Repair as necessary
TURN fuse blown
Turn signal flasher faulty
Turn signal switch faulty
Wiring or ground faulty
LIGHTING
Troubleshooting
STOP fuse blown
Stop light swtich faulty
Wiring or ground faulty Light bulb burned out
Socket, wire or ground faulty
High beam headlights or
headlight flashers do not
operate
Light control rheostat faulty
Wiring or ground faulty Instrument lights do not
light (taillights light)Tail, parking and
license light do not
light
Turn signal switch faulty
Wiring or ground faulty
Hazard warning lights do
not operateReplace bulb
Repair as necessary
Headlights do not light
Check switch
Repair as necessaryCheck rheostat
Repair as necessary Only one light comes
ON
Turn signal does not
flash on one side
Turn signals do not
operateBE±3
BE±3
BE±18
BE±15
BE±25
Adjust or replace switch
Stop light switch faultyBE±3
BE±18
BE±15
BE±25
Stop lights do not light
Stop lights stay on
BE±3
BE±19
BE±19BE±3
BE±19
BE±15
Possible cause
BE±15
BE±25
BE±3
BE±89
RemedyProblem
BE±15BE±23 BE±89BE±25
BE±25Page
± BODY ELECTRICAL SYSTEMLightingBE±14

Turn Signal Flasher
INSPECTION OF FLASHER
INSPECT FLASHER OPERATION
(a) Connect the positive (+) lead from the battery to
terminal 3 and the negative (±) lead to terminal 2.
(b) Connect the two turn signal light bulbs parallel to each
other to terminals 1 and 2, check that the bulbs turn
on and off.
HINT: The turn signal lights should flash 60 to 120 times per
minute.
If one of the front or rear turn signal lights has an open cir±
cuit, the number of flashes will be more than 140 per mi
ute.
If operation is not as specified, replace the flashes. 2. INSPECT RELAY OPERATION
(a) Apply battery voltage to terminals 1 and 3.
(b) Check that there is continuity between terminals 2
and 4.
(c) Check that there is no continuity between terminals
3 and 4.
If operation is not as specified, replace the relay.
Hazard Warning Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
Inspect the switch continuity between terminals.
If continuity is not as specified, replace the switch or
bulb.
Switch position
OFF (Free)
ON (Lock) Terminal0)c
o
N t
o(71
± BODY ELECTRICAL SYSTEMLightingBE±19

Taillight Failure Sensor
INSPECTION OF SENSOR
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the failure sensor and
ground the terminal 3 on the wire harness side.
(b) Remove the CHARGE fuse and turn the ignition
switch ON, check that the bulb lights.
If bulb does not light, inspect the bulb.
2. INSPECT SENSOR CIRCUIT
Disconnect the failure sensor connector and inspect the
connector on the wire harness side as shown in the chart.
If circuit is as specified, replace the relay.
Stop light switch ON (Brake pedal depressed)Stop light switch OFF (Brake pedal released)
Turn light control switch TAIL or HEAD Turn ignition switch to OFF or ACC Turn ignition switch to OFF or ACC
Turn light control switch OFF Turn ignition switch ON
Remove CHARGE fuse
Turn ignition
switch ON
Install CHARGE fuse
Tester
connectionSpecified value
Battery voltage
Battery voltage
Battery voltageBattery voltage
No voltage Continuity
No voltageContinuityNo vottage No voltage Continuity
ContinuityNo voltage
Continuity ContinuityConditionCheck for
Voltage Voltage
VoltageAlways
AlwaysAlways
± BODY ELECTRICAL SYSTEMLightingBE±20

Fuel Level Warning
INSPECTION OF LEVEL WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the sender gauge.
(b) Connect terminals 1 and 2 on the wire harness side-
connector.
(e) Turn the ignition switch ON, check that the warning
light lights.
If the warning light does not light, test the bulb.
2. INSPECT WARNING SWITCH OPERATION
(a) Apply battery voltage to terminals 1 and 2 through a
3.4W test bulb, check that the bulb lights.
HINT: It will take a short time for the bulb to light.If resistance value is not as specified, replace the receiver
gauge.
3. INSPECT SENDER GAUGE OPERATION
(a) Connect a series of three 1.5V dry cell batterys.
(b) Connect the positive (+) lead from the dry cell batter-
ys to terminal 3 through a 3.4W test bulb and the neg-
ative (±) lead to terminal 4.
(c) Check that the voltage rises between terminals 3 and
4 as the float is moved from the top to bottom posi-
tion. 2. MEASURE RECEIVER GAUGE RESISTANCE
Measure the resistance between terminals.
(d) Measure the resistance between terminals 3 and 4
for each float position.
If operation is not as specified, replace the sender
gauge.
Between terminals
Resistance (W)
Resistance (W)
All±Trac/4WD Float position
mm (in.)
FWD
± BODY ELECTRICAL SYSTEMCombination MeterBE±37

Low Oil Pressure Warning
INSPECTION OF PRESSURE WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the pressure switch
and ground the connector on the wire harness side.
(b) Turn the ignition switch ON, check that t he warning
light lights.
If the warning light does not light, test the bulb.
2. INSPECT PRESSURE SWITCH OPERATION
(a) Disconnect the connector from the switch.
(b) Check that there is continuity between terminal and
ground with the engine stopped.
(c) Check that there is no continuity between terminal
and ground with the engine running.
HINT: Oil pressure should be over 0.3 kg/cm2 (4.3 psi, 29
kPa).
If operation is not as specified, replace the switch.If resistance value is not as specified, replace the send-
er gauge. 3. MEASURE SENDER GAUGE RESISTANCE
Measure the resistance between terminal and ground.
ater temperature oC
(OF)Resistance (
)
N i ppo nde nso Yazaki
± BODY ELECTRICAL SYSTEMCombination MeterBE±39

Brake Warning
INSPECTION OF BRAKE WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connectors from the level warning
switch and parking brake switch.
(b) Connect terminals on the wire harness side of the
level warning switch connector.
(e) Remove the CHARGE fuse and turn the ignition
switch
ON, check that the warning light lights.
If the warning light does not light, test the bulb.
2. INSPECT LEVEL WARNING SWITCH OPERATION
(a) Check that there is no continuity between terminals
with the switch OFF (float up).
(b) Check that there is continuity between terminals with
the switch ON (float down).
If operation is not as specified, replace the switch.
Open Door Warning
INSPECTION OF OPEN DOOR WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the door courtesy switch
and ground it.
(b) Turn the ignition switch ON, check that the warning light
lights.
If the warning light does not light, test the bulb.
2. INSPECT COURTESY SWITCH OPERATION
(a) Check that there is continuity between terminal and
switch body with the switch pin released.
(b) Check that there is no continuity between terminal and
switch body when the switch pin is pushed in.
If operation is not as specified, replace the switch. 3. INSPECT PARKING BRAKE SWITCH OPERATION
(a) Check that there is continuity between terminal and
switch set nut with the switch pin released.
(Parking brake lever pulled up)
(b) Check that there is no continuity between terminal
and switch set nut with the switch pin pushed in.
(Parking brake lever released)
If operation is not as specified, replace the switch.
± BODY ELECTRICAL SYSTEMCombination MeterBE±40

Seat Belt Warning
INSPECTION OF SEAT BELT WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the seat belt warning
relay and ground the terminal 5 on the wire harness
side.
(b) Turn the ignition switch ON, check that the warning
light lights.
If warning light does not light, test the bulb.
2. INSPECT BUCKLE SWITCH OPERATION
(a) Disconnect the connector from the switch.
(b) Check that there is no continuity between terminals
on the switch side connector with the belt fastened.
(c) Check that there is continuity between terminals on
the switch side connector with the belt unfastened.
If operation is not as specified, replace the seat belt inner.
3. INSPECT UNLOCK WARNING SWITCH OPERATION
(See page BE±1 3)
If operation is not as specified, replace the switch.
4. INSPECT SEAT BELT WARNING RELAY CIRCUIT
Disconnect the relay connector and inspect the connector
on the wire harness side as shown in the chart.
Unlock warning switch OFF (Ignition key removed)
If circuit is as specified, replace the relay.
Unlock warning switch ON (Ignition key set)
Buckle switch ON (Seat belt unfastened)Buckle switch OFF (Seat belt fastened)Courtesy switch ON (Door opened)
Turn ignition switch to OFF or ACCTurn ignition switch to OFF or ACC Courtesy switch OFF (Door closed)
Turn ignition switch ONTurn ignition switch ON
6 ± Ground
Tester
connectionSpecified value
Battery voltage
Battery voltage
Battery voltageBattery voltage
No continuity 1 ± Ground
2 ± Ground
3 ± Ground
5 ± Ground4 ± GroundContinuity
Continuity
ContinuityNo voltageNo voltageNo voltage
No voltage
Continuity Condition
Check for
VoltageVoltage
Always
± BODY ELECTRICAL SYSTEMCombination MeterBE±41

Seat Belt. Warning Light
INSPECTION OF WARNING LIGHT
INSPECT WARNING LIGHT OPERATION
(a) Disconnect the computer connector and ground the
terminal 10 of the wire harness side connector.
(b) Turn the ignition switch ON, check that the bulb lights.
If operation is not as specified, check the bulb.
Buckle Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminals with
switch ON (unfasten lap belt).
(b) Check that there is no continuity between terminals
with switch OFF (fasten lap belt).
If continuity is not as specified, replace the switch.
Door Courtesy Switch (Driver's side)
INSPECTION OF SWITCH
INSPECT SWITCH OPERATION
(a) Check that there is continuity between terminal and
body ground with the switch ON (open door).
(b) Check that there is no continuity between terminal
and body ground with the switch OFF (close door).
If operation is not as specified, replace the switch.
Spool Release Switch
INSPECTION OF SWITCH
INSPECTION SWITCH CONTINUITY
(a) Check that there is continuity between terminals with
switch ON (pull up).
(b) Check that there is no continuity between terminals
with switch OFF (push down).
It continuity is not as specified, replace the switch.
Release Lever Warning Light
INSPECTION OF WARNING LIGHT
INSPECT WARNING LIGHT OPERATION
(a) Disconnect the computer connector. Ground the termi-
nal 2 of the wire harness side conne¿¿or.
(b) Turn the ignition switch ON, check that the bulb lights.
If operation is not as specif¿¿d, check the bulb.
± BODY ELECTRICAL SYSTEMAutomatic Shoulder BeltBE±67

From the wheel speed signals from each sensor, it calculates
acceleration, deceleration and slip values and sends signals to
the actuator to control brake fluid pressure. Detects the deceleration speed of the vehicle and sends a signal'
accordingly to the A.6.S. computer.
Controls the brake fluid pressure to each disc brake cylinder
through signals from the computer. Lights up to alert the driver when trouble has occured in the
Anti±lock Brake System. Detects the wheel speed of each of the left and right front
wheels.
Detects the wheel speed of each of the left and right rear wheels.
LOCATION OF SYSTEM PARTS FUNCTION OF COMPONENTS
Anti±lock Brake System Computer Deceleration Sensor (For 4WD)
ANTI LOCK Warning Light Front Speed Sensor
Rear Speed SensorComponentFunction
Actuator
WAGON
± BRAKE SYSTEMAnti±lock Brake System (A.B.S.)BR±58

The ER system is composed of there basic sub±systems: Fuel, Air Induction and Electronic Control Systems.
FUEL SYSTEM
Fuel is supplied under constant pressure to the EFI injectors by an electric fuel pump. The injectors inject a
metered quantity of fuel into the intake manifold in a accordance with signals from the ECU (Electronic Control
Unit).
AIR INDUCTION SYSTEM
The air induction system provides sufficient air for engine operation.
ELECTRONIC CONTROL SYSTEM
The Camry 3S±FE and 2V1±FE engines are equipped with a Toyota Computer Control System (TCCS) which
centrally controls the EFI, ESA, ISC, Diagnosis systems etc. by means of an Electronic Control Unit (ECU±
formerly ER computer) employing a microcomputer.
By means of the ECU, the TCCS controls the following functions:
1. Electronic Fuel Injection (EFI)
The ECU receives signals from various sensors indicating changing engine operation conditions such as:
Intake air volume
Intake air temperature
Coolant temperature
Engine rpm
Acceleration/deceleration
Exhaust oxygen content etc.
The signals are utilized by the ECU to determine the injection duration necessary for an optimum air±fuel ratio.
2. Electronic Spark Advance (ESA)
The ECU is programmed with data for optimum ignition timing under any and all operating conditions.
Using data provided by sensors which monitor various engine functions (rpm, coolant temperature, etc.), the
microcomputer (ECU) triggers the spark at precisely the right instant. (See IG section)
3. Idle Speed Control (ISC)
The ECU is programmed with target idling speed values to respond to different engine conditions (coolant
temperature, air conditioner ON/OFF, etc.). Sensors transmit signals to the ECU which control the flow of air
through the by±pass of the throttle valve and adjust idle speed to the target value. (See page FI±45,115
or 62, 117)
4. Diagnosis
The ECU detects any malfunctions or abnormalities in the sensor network and lights a ºCHECKº engine warn-
ing light on the instrument panel. At the same time, the trouble is identified and a diagnosis code is recorded
by the ECU. The diagnosis code can be read by the number of blinks of the ºCHECKº engine warning light
when terminals TE1 and E1 are connected. The diagnostic codes are refer to the later page.
(See page FI±25 or 27)
5. Fail±safe Function
In the event of the sensor malfunctioning, a back±up circuit will take over to provide minimal drivability, and
the ºCHECKº engine warning light.
± EFI SYSTEMSystem DescriptionFI±4