1986 TOYOTA SUPRA heater

229
5. AIR CONDITIONING OPERATION
THE A/C AMPLIFIER RECEIVES VARIOUS SIGNALS, I.E., THE ENGINE RPM FROM THE IGNITER, OUTLET TEMPERATURE SIGNAL
FROM THE A/C THERMISTOR, COOLANT TEMPERATURE FROM THE ENGINE COOLANT TEMP. SENSOR (EFI WATER TEMP. SENSOR)
AND THE LOCK SIGNAL FROM THE A/C COMPRESSOR, ETC.
WHEN THE ENGINE IS STARTED AND THE A/C SW (HEATER CONTROL SW) IS ON, A SIGNAL IS INPUT TO THE A/C AMPLIFIER. AS A
RESULT, THE GROUND CIRCUIT IN A/C AMPLIFIER IS CLOSED AND CURRENT FLOWS FROM HTR FUSE TO TERMINAL 1 OF A/C
MAGNETIC CLUTCH RELAY " TERMINAL 2 " TERMINAL ACMG OF ENGINE CONTROL MODULE (ENGINE ECU) " TERMINAL A/C "
TERMINAL MGC OF A/C AMPLIFIER " TERMINAL GND " GROUND, TURNING THE RELAY ON, SO THAT THE A/C MAGNETIC CLUTCH
IS ON AND THE A/C AMPLIFIER OPERATES.
AT THE SAME TIME, THE ENGINE CONTROL MODULE (ENGINE ECU) DETECTS THE MAGNETIC CLUTCH IS ON AND THE A/C
AMPLIFIER IS OPERATING AND OPENS DIRECTION TO AVOID LOWERING THE ENGINE RPM DURING A/C OPERATING.
WHEN ANY OF THE FOLLOWING SIGNALS ARE INPUT TO THE A/C AMPLIFIER, THE A/C AMPLIFIER OPERATES TO TURN OFF THE
AIR CONDITIONING.
*ENGINE RPM SIGNAL IS HIGH.
*COOLANT TEMP. SIGNAL IS HIGH.
*A SIGNAL THAT THE TEMPERATURE AT THE AIR OUTLET IS LOW.
*A SIGNAL THAT THERE IS A LARGE DIFFERENCE BETWEEN ENGINE SPEED AND COMPRESSOR SPEED.
*A SIGNAL THAT THE REFRIGERANT PRESSURE IS ABNORMALLY HIGH OR LOW.

230
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
7. 5A
HTR
E9
E9
E3E3
E2 2
1A 51K22
22 22265 12
3
52 31
23 41531 42
22 22
1 2 4
M
1 2
M
1 2
M 21 IK 1 3IK12EA1 1
IK1 1 IB 4 1
IF15
IF313 IB23
EB IGEB A 2A3
B 2B1A1 FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
R±L
R±L
R±L
R±L
R±LR±L
W±G
L±W
L
L
II1 10
LL L±W
L L±W
LW±B W±B
R±L B
R±L R±L L±R
L±W W±B
L±R L±R
L B
BR
W±B W±B
L
R±L
L±B
L±BL±B
L±BL±BL
W±B W±B W±B
W±B
W±BW±BL±R W±R LL
W±G
R±L 22 11
(
*1) (
*1)
(
*1)
50A
HTR30A
FAN
RADIATOR FAN
RELAY NO. 2
RADIATOR FAN
RELAY NO. 1
HEATER
RELAY
A/C MAGNETIC
CLUTCH RELAY
A/C SINGLE
PRESSURE SW A/C MAGNETIC
CLUTCH A4
ENGINE COOLANT
TEMP. SW
(
WATER TEMP. SW) E5
RADIATOR
FAN MOTOR R1
A/C CONDENSER
FAN MOTOR A2
B3
BLOWER MOTOR +B SI
M+ M± GNDBLOWER MOTOR
CONTROL RELAYB B4 ,B5AE9:*1
E20 : * 2
E11 : * 1
E26 : * 2R2
R3
A 3
A 2
A3A
EA E5
W±B

232
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
IG1 16 IG113 IG115 IG114 IF1 10
I15
I15
B 8B19 B20 B17 C16 C4C10 C11 C1C2 A 1A6A18 A5B6B3B4 MA 9 W±B
R±L
R±L
R±L
R±L
G±R
G
GR G±R
G
GRR±L R±L R±L
R±L
V
R±Y
BR
Y
BR±W
GW±B
2 534
R±L
IG AIR AIF AIM/AMOUT L±RDEF L±DEF L±F/D L±FOOT L±B/L L±FACEAIR INLET CONTROL SERVO MOTOR A2 4HEATER CONTROL SWB H12 , H13A
A/C AMPLIFIERA A12 , A13CRR±
DEFOG DEF F/D FOOT B/L FACE
RECIRC
FRESH
B ,A14

233
*
1:2JZ±GTE
*2 : 2JZ±GE
C 6C17 C18 C19 C12 C15 C14 C3C13 B1B4B3B2A8A10 4 A9B11 B 12 B11 A7A15 3 A4A14 A17 A12 A16 B1B10 B9A13 B2B7A11 A2A10
I12
R±B
LG±B
GR
B
LG
P
B±W
P±B
R
LG±R
W±L
R±W
G±W
L±R
Y±B
P±B
V±W
L±B
BR±W V±W
BR±W
V±W A
A
L±MAUTO L±REC L±FRS L±A/C L±HI L±M3 L±M2 L±M1 L±L0 SW7 SW6 SW5 SW4 SW3 SW2 SW1 SG TSET
A/C AMPLIFIERA A12 , A13C AUTOREC/
FRS A/C FAND±FAND+ OFF
WARM COOL HEATER CONTROL SWB H12 , H13A
B ,A14

236
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
A 4 A/C MAGNETIC CLUTCH4 ± GROUND: APPROX. 3.7

A 3(A) A/C DUAL PRESSURE SW [A/C TRIPLE PRESSURE SW] (2JZ±GTE)(A) 1±(A) 4 : OPEN ABOVE APPROX. 225 KPA (33 PSI, 2.3 KG/CM2) OR 3140 KPA (458 PSI, 32 KG/CM2)
A 3(B) A/C DUAL PRESSURE SW (2JZ±GE)(B) 1±(B) 2 : OPEN ABOVE APPROX. 225 KPA (33 PSI, 2.3 KG/CM2) OR 3140 KPA (458 PSI, 32 KG/CM2)
A12(C), A13(A), A14(B) A/C AMPLIFIER+B ± GROUND: ALWAYS APPROX. 10±14 VOLTS
IG ± GROUND: APPROX. 10±14 VOLTS WITH IGNITION SW AT ON POSITION
HR ± GROUND: APPROX. 10±14 VOLTS WITH IGNITION SW AT ON POSITION AND DO NOT TURN THE BLOWER MOTOR
BELOW 1 VOLTS WITH IGNITION SW AT ON POSITION AND TURN THE BLOWER MOTOR
ACC ± GROUND: APPROX. 10±14 VOLTS WITH IGNITION SW AT ACC OR ON POSITION
TW ± GROUND:10±14 VOLTS AT START THE ENGINE AND MAX. COLD POSITION OF A/C TEMP. CONTROL SW
BELOW 1 VOLTS AT START THE ENGINE AND MAX. WARM POSITION OF A/C TEMP. CONTROL SW
MGC ± GROUND: BELOW 1 VOLTS AT START THE ENGINE, PUSH THE A/C AUTO SW AND A/C SW ON POSITION
10±14 VOLTS AT START THE ENGINE, PUSH THE A/C AUTO SW AND A/C SW OFF POSITION
BLW ± GROUND:1.0±3.0 VOLTS WITH THE IGNITION SW ON AND TURN THE BLOWER MOTOR
S5 ± GROUND:4±6 VOLTS WITH THE IGNITION SW ON
SG ± GROUND: ALWAYS CONTINUOUS
AMH ± AMC13±19 VOLTS WITH IGNITION SW OFF
AOF ± GROUND: APPROX. 12 VOLTS WITH FACE SW ON
AOD ± GROUND: APPROX. 12 VOLTS WITH DEF SW ON
GND ± GROUND: ALWAYS CONTINUOUS
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A124 (2JZ±GTE)A1728H12A29A 126 (2JZ±GE)A2428H13B29
A 224A2528I 427
A3A24 (2JZ±GTE)A2628J 129A 3B26 (2JZ±GE)B 328R 125
A424 (2JZ±GTE)B 4A28R 225A 426 (2JZ±GE)B 5B28R 325
A12C28C10A28T 629
A13A28C12B28V1025 (2JZ±GTE)
A14B28E 524V1027 (2JZ±GE)
A1528E1029
A1628E1129
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
423R/B NO. 4 (LEFT KICK PANEL)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A20ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1E20INSTRUMENT PANEL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1H20COWL WIRE AND J/B NO 1 (LEFT KICK PANEL)1K20COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EA132 (2JZ±GTE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE (NEAR THE R/B NO 2)EA134 (2JZ±GE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE (NEAR THE R/B NO. 2)
IB236ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL)
IB436ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)IB636ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)
IF136INSTRUMENT PANEL WIRE AND COWL WIRE (INSTRUMENT PANEL REINFORCEMENT LH)
IF336INSTRUMENT PANEL WIRE AND COWL WIRE (RIGHT KICK PANEL)
IG138INSTRUMENT PANEL WIRE AND COWL NO. 3 WIRE (BEHIND HEATER CONTROL SW)
II138ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
IK138COWL NO. 4 WIRE AND COWL WIRE (RIGHT KICK PANEL)
SERVICE HINTS

240
GROUND POINT
FRONT FOG LIGHT AND
PA RKING LIGHT RH
EFI NO. 2 RELAY
EFI MAIN RELAY
HEATER RELAY
FRONT WIPER MOTOR
A/C CONDENSER FAN
MOTOR
BRAKE FLUID LEVEL
WARNING SW
TRACTION PUMP AND
MOTOR
COMBINATION METER
ENGINE OIL
LEVEL SENSOR
NOISE FILTER
IGNITER FRONT FOG LIGHT AND
PARKING LIGHT LH FRONT SIDE MARKER
LIGHT LHDA YTIME
RUNNING
LIGHT RELAY
NO. 3
FRONT SIDE MARKER
LIGHT RH
ENGINE HOOD
COURTESY SW
FRONT TURN SIGNAL
LIGHT LH
FRONT TURN SIGNAL
LIGHT RH
HEADLIGHT LO RH
HEADLIGHT LO LH
ABS RELAY
A /C DUA L PRE SSURE
SW
ABS SOLENOID
RELAY
TRACTION SOLENOID
RELAY
A BS ACTUATOR E2
E5
E8 E8 E2 E2E2 0 2
2
2
5
5
EB EA
HEATED OXYGEN
SENSOR(
SUB)
HEATED OXYGEN
SENSOR(
MAIN)
ED EC II1 24
I17 E16 I 17I11
IJ1 18
(
E1)
(
E01)
(
E02) IC18 W±B
W±B
W±B
W±B W±B
W±B W±BW±B
W±B
W±B
W±B
W±B
W±B
BR
BR
BR
BRBR
BR W±BW±B
(
*4)
W±B
(
*3) W±B
(
*3)W±B
(
*1)
W±B
(
*4)
W±B
W±B
W±B
W±B
W±B
W±B W±BW±B W±B
BR BR
BR
BR
BR
BR
BR BR
BR BRBR
BR
W±B
(
*3)W±B
W±B
(
*3) E7 :*3
E20 : * 4E2:*3
E18 : * 4E2:*3
E18 : * 4
E2:*3
E18 :
*4
E5:*3
E19 : * 4
DAYTIME RUNNING
LIGHT RELAY
NO. 3 RADIATOR FAN MOTOR
E11 : * 3
E24 :
*4W±B
W±B
W±B W±B
W±B
(
*1)E2:*3
E18 : * 4
W±B
(
*3)
(
±S)(
±S)
DATA LINK CONNECTOR 2
(
TDCL)
DATA LINK CONNECTOR 1
(
CHECK CONNECTOR) RADIATOR FAN
RELAY NO. 2 (
E) ENGINE COOLANT TEMP.
SW(
WATER TEMP. SW)
(
±S)
E3
W±B W±B
W± B W± B W±B W±B
W±B
W± B
BR E2:*3
E18 : * 4
(
L)
E8 W±B
(
*1)
(
*3) (
*3)(
*3)
(
*3)
(
*3)(
*3)
(
*3)
(
*3)
(
*3)
ENGINE CONTROL
MODULE
(
ENGI NE AND
ELECTRONICALLY
CONTROLLED
TRANSMI SSION)
W±B

241
*
4:2JZ±GE *
2:USA *
1 : CANA DA*
3:2JZ±GTE
SUB HEATED OXYGEN
SENSOR
(
FOR CALIFORNIA)
VOLUME AIR FLOW
(
AIR FLOW METER)
POWER STEERING
PRESSURE SW
DOOR LOCK MOTOR AND
DOOR UNLOCK
DETECTION SW LH
ROOM LIGHT SW
[DOOR KEY LOCK AND
UNLOCK SW LH]
DOOR KEY LOCK AND
UNLOCK SW LH
REMOTE CONTROL
MIRROR AND MIRROR
HEATER LH
POWER WINDOW MASTER
SW
PERSONAL LIGHT
CENTER AIRBAG
SENSOR ASSEMBLY
POWER MAIN RELAY
INTEGRA TION RELAY
LIGHT CONTROL SW
[COMB. SW]
DIMMER SW
[COMB. SW]
DAYTIME RUNNING
LIGHT RELAY NO. 3HEATED OXYGEN
SENSOR
(
FOR CALIFORNIA
ON FRONT SIDE)
HEATED OXYGEN
SENSOR
(
FOR CALIFORNIA
ON REAR SIDE)
(
E1)
CRUISE CONTROL
ECU
KICK DOWN SW
CRUISE CONTROLH SW
[COMB. SW]
UNLOCK W ARNING SW
KEY INTERLOCK
SOLENOID
WIPER AND WASHER SW
[COMB. SW]
RHEOSTAT
REMOTE CONTROL
MIRROR SW
TELLTALE LIGHT LH
TURN SIGNAL
FLASHER I11 I17 E27
E28
I17
I4
I9
I2
I2
I3
I3
I1 B1 B1 B1 B1IJ118
IC18
ED
1H13
1K12
1E18
1J1
1K6 1D10
1F6
1G3
IG4
1K5E28
E27
4
IE(
E01)
(
E02)
W±B
W±B
IB513
W±B
(
*
1) W±B
(
*
1)(
*
4) BR BR BR BR BR BR
BR
BR
BR
BR BR
BR
BR
BR
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B W±BW±B W±B W±B W±B
W±B W±B W±B W±B
W±B W±B
W±B
W±B
W±BBR BR
BR BR BR W±B W±B W±B
(
E1)
(
E2)
W±B W±B
W±B
W±B W±B DATA LINK CONNECTOR 2
(
TDCL)
DATA LINK CONNECTOR 1
(
CHECK CONNECTOR)
ENGINE CONTROL
MODULE
(
ENGINE AND
ELECTRONICALLY
CONTROLLED
TRANSMISSION)
(
A/T)

242
GROUND POINT
STEREO POWER
AMP LIFIER
COMBINATION METER
TEL LTALE L IGHT RH
FUEL SENDER
RADIO AND PLAYER
BLOWER MOTOR
CONTROL RELAY
SEAT HEATER RELAY
(
FOR PASSENGER' S
SEAT)
SEAT HEATER(
FOR
PASSENGER' S SEAT)
BUCKLE SW RH
DOOR COURTESY SW RH
HIGH BEAM INDICATOR
LIGHT [COMB. METER]
TRAC OFF SW
TRACTION ECU
ABS LATERAL
ACCELERATION
SENSOR
SHIFT LOCK ECU
ELECTRONICALLY
CONTROLLED
TRANSMISSION
PATTERN SELECT SW
O/DMAINSWSEAT HEATER SW
DAYTIME RUNNING
LIGHT RELAY(
MAIN) (
EP)
(
GND)
HEATER CONTROL SW
CIGARETTE LIGHTER
CLOCK
GL OVE B OX L IGHT SW
AUTO ANTENNA
CONTROL RELAY
THEFT DETERRENT ECU
PPS ECU
DOOR LOCK CONTROL
SW RH
DOOR KEY LOCK AND
UNLOCK SW RH
DOOR LOCK MOTOR AND
D OOR UNL OC K
DETECTION SW RH
REMOTE CONTROL
MIRROR AND MIRROR
HEATER RH IG
IH I8
I3
I24 I24 I23
I23
I4 I20
I11
I18
I9
I9I21
I21
B2 B2 I15
B2 IL116 IF311
IE13
BP13
IK11
IF114
I18
I18
I18
I11IF
I14(
E2)
(
VER1)COMBINATION
METER
A/C
AMPLIFIER
W±B
(
*
2)W±B
(
*
1)
W±B
(
*
1)
W±B
(
*
2)
W±B
(
*
3)
W±B
(
*
3)
W±B
(
A/T)W±B
(
*
1)
W±B
(
*
1) W±B
(
*
1)W±B
(
*
1)W±B
(
*
1) W±B
(
*
1)
W±B
(
*
1)
W±B
(
*
3)
W±BW±B W±B
W±BR±L W±B W±B W±B
W±B W±B W±B W±B W±B W±BW±B
W±B W±B W±B
W±B
W±B
W±BW±B W±B W±B W±B
W±B
W±B BRBR BRBR
BR BR BR
BRA
A
A
A
A
A
A A
BR
BR
W±B W±BW±B
W±B W±B
W±B W±B
W±B W±B
W±BW±B
JUNCTION
CONNECTOR J1
I11 :*
3
I4:*
4
I11 :*
3
I18 : * 4 (
*
1)(
*
1) (
*
6)
(
*5) BR
(
GND)
(
GND)
(
GND)ABS ECU
(
*
4)
ABS AND
TRACTION
ECU(*
3) I10
W±BW±B
(
A/T)
(
A/T)A