1986 TOYOTA CAMRY V20 heater

Ignition Switch ºONº
Blower Switch º'ONº " Heater Relay ªONº (Blower Motor ºRUNº)
A/C Switch ºONº " A/C Amplifier º'ONº (A/C Amp. Main Power Supply) 1. PRINCIPLE OF A/C ELECTRICAL CIRCUIT
2. HOW IS MAGNETIC CLUTCH ENERGIZED?
The general process until the magnetic clutch is energized is shown below.
Dual Pressure Switch º'ONº:
Refrigerant Condition (2.1 kg/cm2 (30 psi, 206 kPa) less than 27 kg/cm
2 (384 psi, 2,648 kPa))
Thermistor supplies temperature signal of evaporator to A/C amplifier.
VSV ºONº " E/G Idle±Up
Magnetic Clutch Relay º'ONº
Temperature Sensor ºONº:
Temperature of Temperature Sensor is less than 180
°C (356°F).
Magnetic Clutch ºONº
Revolution Detecting Sensor supplies RPM signal of compressor to A/C amplifier.
If compressor is not locked, magnetic clutch is continuously energized.
± AIR CONDITIONING SYSTEMGeneral DescriptionAC±14

Blower does not, operate
(a) GAUGE fuse blown
(b) FL blown
(c) Circuit breaker faulty
(d) HEATER relay faulty
(e) HEATER fuse blown
(f) Blower motor faulty
(g) Blower resistor faulty
(h) Blower switch faulty
(i) Wiring or ground faulty
Magnetic clutch does not engage
(a) FL (30A CDS) blown
(b) Magnetic clutch relay faulty
(c) Magnetic clutch faulty
(d) A/C fuse faulty
(e) A/C switch faulty
(f) Thermistor faulty
(g) A/C amplifier faulty
(h) Revolution detecting sensor faulty
(i) Pressure switch faulty
(j) Wiring or ground faulty
(k) Refrigerant empty
Compressor does not rotate properly
(a) Drive belt loose or broken
(b) Compressor faulty
Expansion valve faulty
Leak i n systemReplace FL and check for short
Check relay
Check magnetic clutch
Replace fuse and check for short
Check switch
Check thermistor
Check amplifier
Check sensor
Check switch
Repair as necessary
Check refrigerant pressure Replace fuse and check for short
Replace FL and check for short
Check circuit breaker
Check relay .
Replace fuse and check for short
Check blower motor
Check blower resistor
Check blower switch
Repair as necessary
Magnetic clutch slipping
Expansion valve faulty
Excessive moisture in the system
Revolution detecting sensor faulty
A/C amplifier faulty
Wiring connection faulty
Condenser clogged
Drive belt slipping
Compressor faulty
Insufficient or too much refrigerant
Air i n systemCheck magnetic clutch
Check expansion valve
Evacuate and charge system
Check sensor
Check amplifier
Repair as necessary
Check condenser
Check or replace drive belt
Check compressor
Check refrigerant volume
Evacuate and charge systemAC±4 to 11
AC±37
AC±23
AC±4 to 11
AC±44
AC±43
AC±45 to 47
AC±24
AC±36
AC±4 to 11
AC±18, 22
Ajust or replace drive belt
Check compressor
Check expansion valve
Test system for leaks
TROUBLESHOOTING
AC±4 to 11
AC±4 to 11
AC±4 to 11
BE±73
AC±4 to 11
Cool air comes out
only at high speedAC±24
AC±45 to 47
AC±4 to 11 Coo! air comes
out intermittently
BE±73
BE±72, 74
AC±4 to 11
AC±33
AC±21
AC±23
AC±22 AC±21
AC±23
AC±39
AC±42
* FL: Fusible LinkPossible cause
AC±23
AC±39 No coolingRemedy Problem
Page
± AIR CONDITIONING SYSTEMTroubleshootingAC±16

HINT: When checking for continuity in circuits which
contain an LED, please observe the following in-
structions.
(a) Use a tester with a power source of 3V or greater to
overcome the circuit resistance.
(b) If a suitable tester is not available, apply battery volt-
age and check that the LED lights up.
If there is no continuity as specified, replace the A/C
switch.
4. INSTALL A/C SWITCH
5. CONNECT NEGATIVE CABLE TO BATTERY
A/C SWITCH (Push Type)
1. DISCONNECT NEGATIVE CABLE FROM BATTERY
2. REMOVE HEATER CONTROL ASSEMBLY
3. DISCONNECT HEATER CONTROL CONNECTOR
4. CHECK A/C SWITCH CONTINUITY
Using an ohmmeter, check continuity between the termi-
nals for each switch position as shown in the table.
AC SWITCH (Lever Type)
(See page AC±12)
ON±VEHICLE INSPECTION
1. DISCONNECT NEGATIVE CABLE FROM BATTERY
2. REMOVE A/C SWITCH
3. CHECK A/C SWITCH FOR CONTINUITY
Using an ohmmeter, check continuity between the termi-
nals for each switch position as shown in the table.
If there in no continuity as specified, replace the A/C
switch.
5. CONNECT HEATER CONTROL CONNECTOR
6. INSTALL HEATER CONTROL ASSEMBLY
7. CONNECT NEGATIVE CABLE TO BATTERYSwitch position
Switch positionIllumination
Terminal
Terminal
A/C
A/C
OFFOFF
± AIR CONDITIONING SYSTEMA C SwitchAC±44

16. REMOVE CENTER LOWER PANEL
(a) (USA)
Remove the two screws and pull out the panel. 15. REMOVE NEATER CONTROL
Remove the four screws and the heater control.
18. REMOVE NUT CONNECTING CENTER BRACKET
AND SAFETY PAD 17. REMOVE SIDE DEFROSTER NOZZLE
HINT: Tape the screwdriver tip before use. (b) (CANADA)
Remove the three screws and panel.
± BODYSafety PadBO±68

21. REMOVE NO.1 HEATER REGISTER DUCT
Pry out the clip and remove the duct.
22. REMOVE NO.3 HEATER REGISTER DUCT
Remove the three screws and duct.
23. REMOVE DEFROSTER NOZZLE
Remove the five screws and nozzle.
24. REMOVE NO.1 INSTRUMENT PANEL REGISTER
Remove the two screws and register.
25. REMOVE NO.3 INSTRUMENT PANEL REGISTER
Remove the three screws and register.
26. REMOVE NO.2 INSTRUMENT PANEL REGISTER
Remove the screws and register.
27. REMOVE SAFETY PAD GARNISH
INSTALLATION OF SAFETY PAD
(See pages BO±62, 63)
INSTALL SAFETY PAD PARTS FOLLOWING REMOVAL
SEQUENCE IN REVERSE
HINT:
wWhen reinstall the speedometer cable, first pull on
the cable guide casing.
wInsert the flange of def±nozzle between the rib (A)
and the safety pad.
± BODYSafety PadBO±70

HEATER
Wiring Diagram (Push Type)
± BODY ELECTRICAL SYSTEMHeaterBE±45

Heater Control Assembly
Connector ºAº
Air Vent Mode Control
Servo Motor RECIRC/FRESH
Control Servo MotorAmplifier
Connector ºAº
Connectors
Air Mix Control Servo Motor
Blower Speed
Control RelayBlower Resistor Connector º6º
Connectorº6º
Blower MotorHeater Relay
± BODY ELECTRICAL SYSTEMHeaterBE±46

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