1986 TOYOTA CAMRY V20 low beam

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

Light Control Switch, Headlight
Dimmer Switch and Turn Signal
Switch
INSPECTION OF SWITCHES
INSPECT SWITCHES CONTINUITY
Inspect the switch continuity between terminals.
Light control switch
If continuity is not as specified, replace the
switch.
Headlight dimmer switch
Turn signal switch
Switch position
Switch position
Switch positionHigh Beam
Right TurnLow Beam
TerminalTerminal
Terminal
Left Turn
NeutralHEAD
FlashTAIL
OFF
± BODY ELECTRICAL SYSTEMLightingBE±15

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

(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

(b) Check the charging circuit as follows: .
With the engine running from idling to 2,000 rpm,
check the reading on the ammeter and voltmeter.
Standard amperage: 10 A or less
Standard voltage: 13.9 ± 15.1 V at 25
°C (77°F)
13.5 ± 14.3 V at 115°C (2390F)
If the voltmeter reading is greater than standard volt-
age, replace the IC regulator.
7. INSPECT CHARGING CIRCUIT WITH LOAD
(a) With the engine running at 2,000 rpm, turn on the high beam
headlights and place the heater blower switch at ºHlº.
(b) Check the reading on the ammeter.
Standard amperage: 30 A or more
If the ammeter reading is less than standard amperage,
repair the alternator. (See page CH±6)
HINT: With the battery fully charged, the indication will
sometimes be less than standard amperage. If the voltmeter reading is less than standard voltage,
check the IC regulator and alternator as follows:
wWith terminal F grounded, start the engine and check
the voltmeter reading of terminal B.
wIf the voltmeter reading is greater than standard voltage,
replace the IC regulator.
.. If the voltmeter reading is less than standard voltage,
check the alternator.
± CHARGING SYSTEMOn±Vehicle InspectionCH±5