relay TOYOTA CAMRY V20 1986 Service Information

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

Integration Relay
INSPECTION OF RELAY
INSPECT RELAY CIRCUIT
Disconnect the relay connector and inspect the connector
on the wire harness side as shown in the chart.
Passenger's side and rear door courtesy switches OFF
(Door closed)
Passenger's side or rear door courtesy switch ON
(Door opened)
Turn headlight dimmer switch to low beam or high beamDriver's side door courtesy switch ON (Door opened)Driver's side door courtesy switch OFF (Door closed)
Turn light control switch to OFF or TAIL
Turn light control switch TAIL or HEADTurn headlight dimmer switch to FlashTurn ignition switch to OFF or ACC
Turn light control switch to HEAD
Turn light control switch OFF
(w/o Fade Out System)
Turn ignition switch ON
Tester
connectionSpecified value
Battery voltageBattery voltageBattery voltage Battery voltage
Battery voltageNo continuity
No continuityNo continuity Condition
No voltageContinuity
No voltageNo voltage
ContinuityContinuityContinuity
Continuity
Continuity Check for
VoltageVoltage
Voltage
AlwaysAlways
± BODY ELECTRICAL SYSTEMLightingBE±21

Room Light Retainer Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is no continuity between terminals
with the switch OFF (Door outside handle released).
(b) Check that there is continuity between terminals with
the switch ON (Door outside handle pulled).
If continuity is not as specified, replace the switch.
Passenger's side and rear door courtesy switches OFF
(Door closed)
Passenger's side or rear door courtesy switch ON
(Door opened)Door room light retainer switch ON
(Door outside handle pulled up on driver's side)
Door room light retainer switch OFF
(Door outside handle released on driver's side)
Turn headlight dimmer switch to low beam or high beamDriver's side door courtesy switch ON (Door opened) Driver's side door courtesy switch OFF (Door closed)
If circuit is as specified, replace the relay.
Turn light control switch to OFF or TAIL
Turn light control switch TAIL or HEADTurn headlight dimmer switch to FlashTurn ignition switch to OFF or ACC
Turn light control switch to HEAD
Turn light control switch OFF
(w/ Fade Out System)
Condition
Turn ignition switch ON Tester
connectionSpecified value
Battery voltage
Battery voltageBattery voltage
Battery voltageBattery voltage
Battery voltageNo continuity
No continuity
No continuityNo continuity
No voltage
No voltageNo voltage
ContinuityContinuity
Continuity ContinuityContinuity
Continuity Continuity
ContinuityContinuity Always . Check for
Voltage
VoltageVoltage
Voltage
Always
AlwaysAlways
± BODY ELECTRICAL SYSTEMLightingBE±22

Current is led from the battery to terminal 12 of the running light relay.
Operation examples of the switch are shown below.
1. IGNITION SWITCH ºONº AND LIGHT CONTROL SWITCH ºOFFº
When the switches are set, current is led from the battery to terminal 1 of the running light relay. Also,
because continuity is made between terminal 3 and the body ground, and 5 and the body ground of
the running light relay, the taillight control relay and headlight control relay are turned on.
Then the taillights and headlights light up.
HINT: Because terminal 14 of the running light relay is not grounded at all times, the headlight dimmer
relay is off, so that the headlights light up at the low beam.
2. LIGHT CONTROL SWITCH IN ºHEADº
When the switch is set, continuity is made between terminal 4 and the body ground, and 2 and the body
ground of the running light relay. Also, because the continuity is made between terminal 5 and the body
ground, and 3 and the body ground of the running light relay at all times, the taillights and headlights
light up.
HINT: When the headlight dimmer switch is set to ºHIGHº, continuity is made between terminal 13 of
the running light relay and the body ground. Also, because continuity is made between terminal 14 of
the running light relay and the body ground, the headlight dimmer relay is turned on. Then the head-
lights go on at the high beam.
3. HEADLIGHT DIMMER SWITCH IN ºFLASHº
When the switch is set, continuity is made between terminal 6 and the body ground, and 13 and the
body ground of the running light relay. Also, because the continuity is made between terminal 5 and
the body ground, and 14 and the body ground of the running light relay, the headlights flash.
4. ENGINE STOPS (IGNITION SWITCH ºONº)
When the engine is stopped, because the continuity between terminal 5 and terminal 10 of the running
light relay remains, so the running lights also remain.
HINT: If ignition switch is turned to ºOFFº, running lights will go off because the continuity between termi-
nal 5 and terminal 10 of the running light relay is cut off.
Light Control Rheostat
INSPECTION OF RHEOSTAT
INSPECT RHEOSTAT OPERATION
(a) Connect the positive (+) lead from the battery to
terminal 1 and the negative (±) lead to terminal 2.
(b) Connect the terminals 1 and 3 through a 3.4 W test bulb.
(c) Gradually turn the rheostat knob from the bright side to
dark side, check that the test bulb brightness changes
from bright to dark.
If operation is not as specified, replace the rheostat.
Daytime Running Light System
(CANADA)
DESCRIPTION
± BODY ELECTRICAL SYSTEMLightingBE±23

WIRING AND CONNECTOR DIAGRAMS
wDimmer Switch
wLight Control
Switch
wTurn Signal SwitchDaytime Running Light Relay Taillight Control RelayHeadlight
Control Rela
Integration RelayIgnition Switch
Dimmer Relay
± BODY ELECTRICAL SYSTEMLightingBE±24

(Relay Operation)
(a) Connect the positive (+) lead from the voltmeter to ter-
minal 7 and negative (±) lead to terminal 10.
(b) Check that there is battery voltage with light control
switch is turned on.
If operation is not as specified, replace the relay.If continuity is not as specified, replace the relay.
2. INSPECT DAYTIME RUNNING LIGHT RELAY
(Relay Circuit)
Disconnect the connector from the relay and inspect the
connector on the wire harness side as shown in the chart.
INSPECTION OF RELAY
1. INSPECT DIMMER RELAY (Continuity)
If circuit is as specified, inspect relay operation.
Apply battery voltage to
terminals 2 and 4.
Light control switch
position
Light control switch
position
Headlight dimmer
switch positionHeadlight dimmer
switch positionLow beam or High beam
Ignition switch
position 7 ± Ground
10 ± Ground
High beam or Flash 13 ± Ground
3 ± Ground
5 ± Ground
Tester connection
Ground terminal 5
Specified value
Battery voltageBattery voltageBattery voltage
Battery voltage Battery voltageNo continuity
No continuity TAIL or HEADNo continuity
No continuity
14 ± Ground12 ± GroundON or STARTLOCK or ACC
1 ± GroundOFF or TAIL
8 ± Ground2 ± Ground
6 ± Ground4 ± Ground
No voltage
No voltage
No voltageContinuity
Continuity Continuity
Continuity
ContinuityContinuity
Condition
Check for
Low beam Condition
Running
Terminal
Constant
Constant
Constant
Constant
Constant Voltage
EngineHEAD
Flash
StopOFF
± BODY ELECTRICAL SYSTEMLightingBE±25

Front Wiper and Washer Switch
INSPECTION OF SWITCH
1. INSPECT SWITCH CONTINUITY
Inspect the switch continuity between terminals.
WIPERS AND WASHERS
Troubleshooting
Replace fuse and check for short
Check motor
Check switch
Repair as necessary
Washer hose or nozzle clogged
Washer motor faulty
Washer switch faulty
Wiring faultyWIPER fuse blown
Wiper motor faulty
Wiper switch faulty
Wiring or ground faulty
Wiper relay faulty
Wiper switch faulty
Wiper motor faulty
Wiring or ground faulty
Repair as necessary
Replace motor
Check switch
Repair as necessaryCheck relay
Check switch
Check motor
Repair as necessary
If continuity is not as specified, replace the switch.
Wipers do not
operate or return
to off position
Wipers do not operate i n I
NT position
Washers do not
operateBE±29
BE±29
BE±29BE±3
BE±29
BE±29 BE±3
BE±28
BE±26 Possible cause
BE±26
BE±28
Switch
positionMIST
position Terminal Remedy Problem
Washer
Switch
WiperBE±26BE±29 Page
FrontRear
± BODY ELECTRICAL SYSTEMWipers and WashersBE±26

Rear Wiper Motor and Relay
INSPECTION OF MOTOR AND RELAY
1. INSPECT RELAY AND MOTOR OPERATES
(a) Connect the positive (+) lead from the battery to terminal
1 and negative (±) leads to both terminal 3 and
motor body.
(b) Check that the motor operates.
2. INSPECT INTERMITTENT OPERATION OF RELAY
(a) Connect the positive 1+y lead from the battery to ter-
minal 1 and negative t±) leads to both terminal 2 and
motor body.
(b) Check that the motor operates intermittently for 9
15 seconds.
If operation is not as specified, replace the relay.
3. INSPECT MOTOR OPERATES, STOPPING AT STOP
POSITION
(a) Start motor operation by connecting the positive (+j
lead from the battery to terminal 1 and the negative (±
lead to both terminal 3 and motor body.
Rear Wiper and Washer Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
Inspect the switch continuity between terminals.
If continuity is not as specified, replace the switch.
Switch position
Terminal
Wash ll
Wash IOFF INT
± BODY ELECTRICAL SYSTEMWipers and WashersBE±29

Replace fuse and check for short
Replace bulb
Check switch
Check switch
Check switch
Check relay
Repair a s necessary ºDOMEº fuse blown
Bulb burned out
Door courtesy switch faulty
Unlock warning switch faulty
Buckle switch faulty
Seat belt warning relay faulty
Wiring or ground faultyºGAUGEº fuse blown
Bulb burned out
Brake fluid level warning switch faulty
Parking brake switch faulty
Wiring or ground faultyReplace fuse and check for short
Replace bulb
Check switch
Check switch
Repair as necessary ºGAUGEº fuse blown
Water temperature gauge faulty
Water temperature sender gauge faulty
Wiring or ground faulty
ºGAUGEº fuse blown
Buibburned out
oil pressure warning switch faulty
Wiring or ground faultyºGAUGEº fuse blown
Bulb burned out
Fuel level warning switch faulty
Wiring or ground faulty
Replace fuse and check for short
Replace bulb
Check switch
±Repair as necessaryReplace fuse and check for short
Replace bulb
Check switch
Repair as necessary
Replace fuse and check for short
Replace bulb
Check switch
Repair as necessaryReplace fuse and check for short
Check gauge
Check sender gauge
Repair as necessaryReplace fuse .and check for short
Check gauge
Check sender gauge
Repair as necessary
COMBINATION METER
Troubleshooting
ºGAUGEº fuse blown
Bulb burned out
Door courtesy switch faulty
Wiring or ground faultyReplace fuse and check for short
Check tachometer
Repair as necessary
ºGAUGEº fuse blown
Fuel gauge faulty
Sender gauge faulty
Wiring or ground faultyºGAUGEº fuse blown
Tachometer faulty
Wiring faulty
Low oil pressure warning
light does not lightWater temperature
gauge does not
operate
Seat belt warning
does not operate
(Canada)Tachometer does not
operate
Brake warning light does
not lightFuel gauge does not
operate
Open door warning light
does not lightFuel level warning light
does not light
BE±40
BE±13
BE±41
BE±41BE±3
BE±38
BE±39BE±3
BE±36
BE±37 Possible cause
BE±3
BE±36
BE±40
BE±40 Problem
Remedy
BE±40BE±39BE±37Page
BE±3BE±3
BE±3
BE±3
BE±3
± BODY ELECTRICAL SYSTEMCombination MeterBE±31

Light Control Rheostat
TAIL Fuse
IGN Fuse
Water Temperature Sender Gauge
Ground
Seat Beh Warning Relay
Brake Fluid Level Warning Switch and Parking
Brake Switch
CHARGE Fuse
TCCS ECU
A.B.S. ECU
Cruise Control ECU and ECT ECU
Ground
Fuel Sender Gauge Terminal 3
Fuel Sender Gauge Terminal 2
GAUGE Fuse
DOME Fuse
Door Courtesy Switch
Low Oil Pressure Switch
Light Failure Sensor
Combination Meter and Gauges
(w/o Tachometer)
Turn Signal Switch Terminal 28
Ground
Turn Signal Switch Terminal 25
Turn Signal Switch Terminal 23 (USA)
HEAD±HI (RH) Fuse (CANADA)
A/T Oil Temperature Switch
COMBINATION METER CIRCUIT
Wiring Connector Side
No.
± BODY ELECTRICAL SYSTEMCombination MeterBE±32