fuse TOYOTA CAMRY V20 1986 Service Information

Rear Window Defogger Switch
INSPECTION OF SWITCH
INSPECT SWITCH OPERATION
(a) Connect the positive (+) lead from the battery to
terminal 2 and the negative (±) lead to terminal 3.
(b) Connect terminals 2 and 6 through a 3.4 W test bulb.
(e) Push the defogger switch. Check that the test bulb
lights for 12 to 18 minutes, then the test bulb goes
out.
If operation is not as specified, replace the switch.
Rear Window Defogger Relay
INSPECTION OF RELAY
1. INSPECT RELAY CONTINUITY
(a) Check that there is continuity between terminals 1
and 3.
(b) Check that there is no continuity between terminals 2
and 4.
(e) Check that there is no continuity between terminals 3
and 4.
If continuity is not as specified, replace the relay.
Reset breaker and check for short
Replace fuse and check for short
Check switch
Check relay
Check wires
Repair as necessary
REAR WINDOW DEFOGGER
Troubleshooting
Circuit breaker OFF
GAUGE fuse blown
Defogger switch faulty
Defogger relay faulty
Defogger wire broken
Wiring and ground faulty Rear window defogger
does not work.BE±3
BE±3
BE±42
BE±42
BE±43 Possible cause Problem
Remedy
Page
± BODY ELECTRICAL SYSTEMRear Window DefoggerBE±42

Heater Blower Switch
(Lever Type)
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
Inspect the heater blower switch continuity.
Control cables broken or binding
Servo motor faulty
Heater hoses leaking or clogged
Water valve faulty
Air dampers broken
Air ducts clogged
Heater radiator leaking or clogged
Heater control unit faulty Heater circuit breaker OFF
GAUGE fuse blown
Heater relay faulty
Blower speed control relay faulty
Heater blower switch faulty
Heater blower resistor faulty
Heater blower motor faulty wiring or
ground faultyReset breaker and check for short
Replace fuse and check for short
Check relay
Check control relay
Check switch
Check resistor
Check motor
Repair as necessary
Check cables
Check servo motor
Replace hoses
Replace water valve
Repair air dampers
Repair air ducts
Repair heater radiator
Repair control unit
*For illumination light
If continuity is not as specified, replace the switch.
Troubleshooting
BE±3
BE±3
BE±48
BE±50
BE±49
BE±48 Bolwer does not
work when fan
switch is on
Incorrect temperature
outputBE±3
BE±3
BE±48
Switch position Possible cause
BE±47
BE±48
Terminal Problem
Remedy
Lever
BE±52
Page
BE±54 Push
OFF
± BODY ELECTRICAL SYSTEMHeaterBE±47

1. DEAD RADIO AND TAPE PLAYER
(a) No power to radio or tape player, or power but no sound.
Possible causes:
wBlown RADIO fuse
wShort circuit or broken wire in power source wire harness
,
wLoose connectors behind radio and tape player
wLoose speaker connector
wDefective speaker
wBroken wire in speaker wire harness
wImproperly installed radio or tape player
wDefective radio or tape player
Inspect and repair wire harness
for radio and tape player.Check for short circuit in
power source wire harness.
DESCRIPTION OF SYMBOLS
Replace radio and tape
player. Check RADIO fuse.
Proceed to Test 2.
Does not blow
Replace fuse.
Blows again TEST 1No short
Blown
Short
± BODY ELECTRICAL SYSTEMAudio SystermBE±95

(b) Tape player okay but not sound from either the FM or
AM band.
Possible causes:
wAntenna disconnected
wAntenna plug not properly connected
wDefective antenna
wDefective antenna cable
wDefective radio or tape player
wBlown DOME fuse
wShort circuit or broken wire in wire harness for
backup power source
Are all connectors behind radio and
tape player properly connected
Is there continuity in speaker
wire harness?Inspect and repair power wire
harness to radio and player.
Temporarily install another
speaker.Is there power to radio and
player connectors?
Inspect and repair speaker
wire harness.
IS radio electronic searchAre speaker connectors connected?Are radio and player
properly connected?
Proceed to Test 1 of
following item.Replace radio and
tape player.
Is either AM or FM okay? Connect properly.Properly reinstall. Connect properly.
Proceed to Test 3.Replace speaker. Proceed to Test 3.
Proceed to Test 2. w/o PlayerYe s TEST 2
TEST 3
TEST 1
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± BODY ELECTRICAL SYSTEMAudio SystemBE±96

HINT: Back±up power refers to the storage voltage for
preset tuning. This is applied even when the ignition
switch is OFF.
Is there back±up power to connectors
behind radio?
Inspect antenna and antenna cable,
and replace as necessary. Check for short circuit in back±up
power source wife harness.Inspect and repair back±up power
wire harness.
Inspect and repair wire harness
for back±up power source.
Temporarily install another
antenna. Okay?Check that antenna plug is
secure in radio.Inspect antenna plug.
Does radio alone work?Reinsert plug. Okay?
Replace tape player.Check DOME fuse.Proceed to Test 3.
Proceed to Test 4. Insert properly.
Replace radio.Replace fuse.
Replace radio. Blows again
TEST 3
TEST 4TEST 2
Blown
Loose Short
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± BODY ELECTRICAL SYSTEMAudio SystemBE±97

CLOCK
Troubleshooting
CLOCK WILL NOT OPERATE
Check amount of time the clock loses or gains per day or a week against the allowable error table.
Check to see if there is 11 ± 15V
on terminal6 of connector on clock side.
Check to see if clock adjust-
ing button is sticking i n posi-
tion and has failed to return.
Check to see if there is volt-
age at terminal B or connec-
tor or clock side.
Check to see if clock ground
wire is loose or rusted.Check to see if battery voltage
is over 11 V with no load.Repair if necessary or re-
place clock. Locate trouble and repair or re-
place fuse as necessary.
Locate cause and repair,
or recharge battery. Check to see if connector on
clock side is loose or rusted.
CLOCK LOSES OR GAINS TIME
Adjusting button
not returned Check to see if fuse is blown.
Recharge or replace battery.
Adjust or replace clock.Locate cause and re-
pair.
Exceeds allowable errorLoose or rustedLoose or rusted
Replace clock.No voltageBlown fuse
Below 11 V
Below 11 VRepair
Repair
± BODY ELECTRICAL SYSTEMClockBE±103

wShort circuit in wire harness between ECU±IG
fuse and terminal 3 of main switch.
wInspect main switch.
(See page
BE±89)
INSPECT SWITCH OPERATION
Is there battery voltage between terminal 4 and
body ground with main switch turned on ? INSPECT POWER SOURCE
Is there battery voltage between terminal 3 and
body ground?
INSPECT INDICATOR LIGHT OPERATION
Connect terminal i to body ground. Does indicator light
light with main switch turned on?
wOpen circuit in wire harness between terminal 5
of main switch and body ground.
wBody ground faulty.
INSPECT GROUND CONNECTION
Is there continuity between terminal 5 and
body ground?
Is there battery voltage between terminal 4 and body
ground with main switch turned off?Open circuit in wire harness between ECU±IG fuse and
terminal 3 of main switch.
INSPECTION OF POWER SOURCE CIRCUIT
No
CONTINUED ON PAGE BE±75 Does indicator light light with main switch turned off?Inspect main switch.
(See page BE±89) Inspect main switch.
(See page BE±89)
Inspect main switch.
(See page BE±89)
Inspect main switch.
(See page BE±89) Replace fuse.
Is operation normal? Turn ignition switch on.
Is ECU±IG fuse normal?
MAIN SWITCHFuse faulty
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± BODY ELECTRICAL SYSTEMCruise Control SystemBE±74

INSPECT GROUND CONNECTION
Disconnect connector from stop light switch.
Is there continuity between terminal 3 of wire
harness side connector and body ground?wOpen circuit in wire harness between terminal 3
and body ground.
wBody ground faulty.
INSPECT STOP LIGHT SWITCH OPERATION
Is stop light switch operation normal?
(See page BE±89)
INSPECT STOP FUSE CIRCUIT
Is there battery voltage between terminal 16 and body
ground with brake pedal released?
INSPECT STOP LIGHT SWITCH CIRCUIT
Is there battery voltage between terminal 15 and body
ground with brake pedal depressed?Short circuit in wire harness between terminal
16 of computer or terminal 1 of stop light
switch and fuse.
Open circuit in wire harness between terminal 16 of
computer and STOP fuse.
Open circuit in wire harness between terminal 15 of
computer and terminal 3 of stop light switch. Disconnect connector from computer and inspect
connector on wire harness side as follows.
INSPECTION OF STOP LIGHT SWITCH CIRCUIT
Connect connector to stop light switch.Replace fuse.
Is operation normal?
Replace stop light switch. Turn ignition switch off.
Is STOP fuse normal?
Replace computer.
STOP LIGHT SW
COMPUTER
Fuse faulty. Ye s
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± BODY ELECTRICAL SYSTEMCruise Control SystemBE±81

INSPECT PARKING BRAKE SWITCH OPERATION
Disconnect connector from parking brake switch.
Is parking brake switch operation normal? (See page
BE±90) INSPECT GROUND CONNECTION
Disconnect connector from brake level warning switch.
Is there continuity between terminal 2 of wire harness side
connector and body gronud?
Short circuit in wire harness between terminal 12 of
computer and terminal 1 of parking brake switch,
terminal 1 of brake fluid level warning switch or terminal
2 of alternator. INSPECT BRAKE WARNING SWITCH
Is brake fluid level warning switch operation nomal?
(See page BE±38)
wOpen circuit in wire harness between terminal 2
and body ground.
wBody ground faulty.
INSPECTION OF PARKING BRAKE SWITCH CIRCUIT
Is there no voltage between terminal 12 and body ground
with parking brake pulled up?
!s there battery voltage between terminal 12 and body
ground with parking brake released? Disconnect connector from computer and inspect connector
on wire harness side as follows.
Open circuit in wire harness between terminal 12 of
computer and terminal of parking brake switch. INSPECT ALTERNATOR OPERATION
is alternator operation normal? (See page CH±4)
Remove CHARGE fuse and ignition switch tuned on. Connect the connector to brake warning switch.
Connect connector to parking brake switch.
BRAKE FLUID LEVEL
WARNING SWITCH
Replace brake warning switch.
Replace parking brake switch.
PARKING BRAKE SWITCH
Turn ignition switch off.
Replace computer.Replace alternator.
ALTERNATOR
COMPUTER
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± BODY ELECTRICAL SYSTEMCruise Control SystemBE±82

Cruise Control Computer Circuit
INSPECTION OF COMPUTER CIRCUIT
Disconnect the computer and inspect the connector on
wire harness side as shown in the below.
Remove CHARGE fuse and
ignition switch turned on with
parking brake lever released. Clutch pedal released or shifted
into only range except
ºNº and ºPº range
Remove CHARGE fuse and
ignition switch turned on with
parking brake lever pulled up.
Apply vacuum approx. 170
mmHg (fi.69 in.Hg, 22.7 kPa)Turn ignition switch and main
switch on
Turn ignition switch and main
switch off
Turn ignition switch and main
switch off Turn ignition switch and main
switch on
Clutch pedal depressed or
shifted into ºNº range Clutch Switch
(M/T) or Neutral
Start Switch (A/T)1 pulse each 44 cm
(15.75 in.) Stop Light Switch
and Release Valve
Turn resume/accel switch offTurn resume/accel switch on Control Switch
(indicator circuit)
Connection or
measure rtem
Turn set/coast switch off Turn set/coast switch on
Control Switch
(resunne/accel)Control Switch
(set/coast)
Vehicle moving slowlyBrake pedal depressed
Parking Brake
SwitchBrake pedal releasedBrake pedal released
10 ± Body ground
13 ± Body ground16 ± Body ground
17 ± Body ground
12 ± Body ground11 ± Body ground15 ± Body ground Tester connection
Stop Light Switch
3 ± Body ground
5 ± Body ground
7 ± Body ground
1 ± Body ground 9 ± Body groundBattery voltageSpecified value
Battery voltage
Battery voltageBattery voltage
Battery voltage No continuity
Vacuum SwitchControl Switch
Vacuum PumpNo continuity Approx. 68

Speed Sensor
No continuity Approx. 30

No continuity
Body GroundControl Valve
No voltageNo voltage
Continuity
Continuity ContinuityContinuity Resistance
ContinuityContinuity
Continuity Continuity
ContinuityNo voltage
No vacuum
ContinuityContinuityContinuity
ContinuityNo vohage
Condition
Resistance Stop FuseCheck for
VoltageVoltage Voltage
Voltage
Voltage4±142±14
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±88