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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
Page 794 of 2389
Heater Relay
INSPECTION OF RELAY
1. INSPECT RELAY CONTINUITY
(a) Check that there is continuity between terminals 1
and 3.
(b) Check that there is continuity between terminals 2
and 4.
(e) Check that there is no continuity between terminals
4 and 5.
If continuity is not as specified, replace the relay.
2. INSPECT RELAY OPERATION
(a) Apply battery voltage to terminals 1 and 3.
(b) Check that there is continuity between terminals 4
and 5.
(e) Check that there is no continuity between terminals
2 and 4.
If operation is not as specified, replace the relay.
Heater Blower Resistor
INSPECTION OF RESISTOR
INSPECT RESISTOR CONTINUITY
(Levertype)
Check that there is continuity between terminals 1 and 3.
If there is no continuity, replace the resistor.
(Push type)
Check that there is continuity between terminals 5 and ^.
If there is no continuity, replace the resistor.
± BODY ELECTRICAL SYSTEMHeaterBE±48
Page 795 of 2389

2. INSPECT INDICATOR LIGHT OPERATION
(a) Connect the positive (+) lead from the battery to
terminal A7 and negative (±) lead to terminal Al 7.
(b) With the blower button pushed in, check that the indi-
cator light is lit. (The indicator light will not go on
when the blower button is in the OFF position.)
(c) With the RECIRC button pushed in, check that the
indicator light is lit.
(d) Next, push the FRESH button in, check that the indi-
cator light is lit and the RECIRC indicator light goes
off.
(e) Press each of the mode buttons in and check that
their indicator lights go on.
If operation is not as specified, replace the heater control.
Heater Control Assembly
(Push Type)
INSPECTION OF HEATER CONTROL ASSEMBLY
1. MEASURE TEMPERATURE CONTROL LEVER
RESISTANCE
Measure the resistance between terminals A1 and A9 for each
lever position.
3. INSPECT BLOWER SWITCH CONTINUITY
Inspect the blower switch continuity between terminals.If each resistance value is not as shown in the table
above, replace the heater control assembly.
If continuity is not as specified, replace the heater control.
Resistance (k) Lever position
Switch
position
Max. Warm
Max Coo!
A17 Terminal Middle
OFF
. B6
± BODY ELECTRICAL SYSTEMHeaterBE±49
Page 796 of 2389
Blower Speed Control Relay
(Push Type)
INSPECTION OF RELAY
1. INSPECT RELAY ºAº CONTINUITY
(a) Check that there is continuity between terminals 5
and 7.
(b) Check that there is no continuity between terminals
3 and 4.
If continuity is not as specified, replace the relay. 5. INSEPCT RECIRC/FRESH CONTROL SWITCH
CONTINUITY
Inspect the switch continuity between terminals. 4. INSPECT AIR VENT MODE SWITCH CONTINUITY
Inspect the switch continuity between terminals.
If continuity is not as specified, replace the heater control.
If continuity is not as specified, replace the heater control.
Switch
positionSwitch
position
FOOT/DEFBI±LEVELTerminal
Terminal
RECiRC
FRESH
FA C E
FOOT
Al 7 A10 At 7
A11
DEF
A12
A15
± BODY ELECTRICAL SYSTEMHeaterBE±50
Page 797 of 2389

6. INSPECT RELAY ºCº OPERATION
(a) Apply battery voltage to terminals 5 and 6.
(b) Check that there is continuity between terminals 1
and 3.
If operation is not as specified, replace the relay. 3. INSPECT RELAY ºBº CoNTIN'U1TY
(a) Check that there is continuity between terminals 5
and 8.
(b) Check that there is no continuity between terminals
2 and 3.
If continuity is not as specified, replace the relay.
5. INSPECT RELAY ºCº CONTINUITY
(a) Check that there is continuity between terminals 5
and 6.
(b) Check that there is no continuity between terminals
1 and 3.
If continuity is not as specified, replace the relay. 2. INSPECT RELAY ºAº OPERATION
(a) Apply battery voltage to terminals 5 and 7.
(b) Check that there is continuity between terminals 3
and 4.
If operation is not as specified, replace the relay.
4. INSPECT RELAY ºBº OPERATION
(a) Apply battery voltage to terminals 5 and 8.
(b) Check that there is continuity between terminals 2
and 3.
If operation is not as specified, replace the relay.
± BODY ELECTRICAL SYSTEMHeaterBE±51
Page 798 of 2389

RECIRC/FRESH Control Servo
Motor (Push type)
INSPECTION OF SERVO MOTOR
INSPECT SERVO MOTOR OPERATION
(a) With the positive (+) lead from the battery to terminal
1 and negative (±) lead to terminal 2, check that the
lever moves smoothly from FRESH to RECIRC.
Air Mix Control Servo Motor
(Push Type)
INSPECTION OF SERVO MOTOR
INSPECT SERVO MOTOR OPERATION
(a) With the positive (+) lead from the battery to terminal
8 and negative (±) lead to terminal 2, check that the
lever moves smoothly from WARM to COOL.
The resistance values from COOL to WARM will suc-
cessively decrease.
If operation is not as specified, replace the servo motor.(b) With the positive (+) lead from the battery to terminal
1 and negative (±) lead to terminal 3, check that the
lever moves smoothly from RECIRC to FRESH.
If operation is not as specified, replace the servo motor.
(b) With the positive (+) lead from the battery to terminal
2 and negative (±) lead to terminal 8, check that the
lever moves smoothly from COOL to WARM.
(c) While operating the servo motor from either points
(a) or (b), measure the resistance values of terminals
13 and 15.
Resistance ()
Position
WARM
COOL
± BODY ELECTRICAL SYSTEMHeaterBE±52
Page 799 of 2389
Air Vent Mode Control Servo Motor
(Push Type)
INSPECTION OF SERVO MOTOR
INSPECT SERVO MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to termi-
nal 2 and negative(±) lead to terminal 1, check that the
lever moves smoothly from DEF to FACE.
(b) Connect the positive (+) lead from the battery to ter-
minal 1 and negative (±) lead to terminal 2, check
that the lever moves smoothly from FACE to DEF.
(c) Check for continuity between terminal as shown be-
low.
If operation is not as specified, replace the motor.
Lever position
Foot/DEF
BI±LEVELTerminal
FOOT FACE
DEF
± BODY ELECTRICAL SYSTEMHeaterBE±53
Page 800 of 2389
Heater Control
(Lever Type)
ADJUSTMENT OF HEAT CONTROL
1. SET AIR INLET DAMPER
Set the air inlet damper and control lever to ºRECIRCº.
4. SET WATER VALVE
Set the water valve and control lever to ºCOOLº.
HINT: Place the water valve lever on ºCOOLº and while
pushing the outer cable in the ºCOOLº direction, clamp the
outer cable to the water valve bracket.
5. TEST CONTROL CABLE OPERATION
Move the control levers right and left and check for stiffness
or binding through the full range of the levers. 2. SET MODE SELECTOR DAMPER
Set the mode selector damper and control lever to º'FACEº.
3. SET AIR MIX DAMPER
Set the air mix damper and control lever to ºCOOLº.
± BODY ELECTRICAL SYSTEMHeaterBE±54