TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-67
CHECK AT ECU TERMINAL
12
345
678
9 10111213141516
AC300861AC
Terminal No. Check item Checking requirement Normal condition
1 Rear defogger switch Defogger switch: ON 0 V
Defogger switch: OFF System voltage
2 Inside/outside air selection
damper motor (outside air)When the damper is moved to
the inside air recirculation
position0 V
When the damper is moved to
the outside air inside air intake
positionSystem voltage
3 Inside/outside air selection
damper motor (inside air)When the damper is moved to
the inside air recirculation
positionSystem voltage
When the damper is moved to
the outside air inside air intake
position0 V
4 Output to the engine-A/T-ECU
(A/C1)A/C stopped 0 V
•A/C switch: ON
•Blower switch: ONSystem voltage
5 Output to the engine-A/T-ECU
(A/C2)When the A/C is under low load System voltage
When the A/C is under high
load0 V
6 Power supply to the A/C
illuminationLighting switch: ON System voltage
7---
8 Blower switch (lo) blower switch: lo System voltage
9---
10 Power supply to the ignition
switch (IG2)Ignition switch: ON System voltage
11 Earth to the A/C illumination Always 0 V
12 Earth Always 0 V
13 Air thermo sensor (outlet side) Sensor probe temperature 25°C
(1.5k ohm)2.2 V
14, 15 - - -
16 Earth to the air thermo sensor Always 0 V
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-68
CHECK AT ECU TERMINAL
21
78
6 534
11
10912
AC304990
AB
Terminal No. Check item Checking requirement Normal condition
1 Output to the engine-A/T-ECU
(A/C1)A/C stopped 0 V
•A/C switch: ON
•Blower switch: ONSystem voltage
2 Output to the engine-A/T-ECU
(A/C2)When the A/C is under low load System voltage
When the A/C is under high
load0 V
3 Earth Always 0 V
4 Earth to the air thermo sensor Always 0 V
5 Power supply to the A/C
illuminationLighting switch: ON System voltage
6 Air thermo sensor (outlet side) Sensor probe temperature 25°C
(1.5k ohm)2.2 V
7 Power supply to the ignition
switch (IG2)Ignition switch: ON System voltage
8 Blower switch (lo) blower switch: lo System voltage
9 Rear defogger switch Defogger switch: ON 0 V
Defogger switch: OFF System voltage
10 Inside/outside air selection
damper motor (outside air)When the damper is moved to
the inside air recirculation
position0 V
When the damper is moved to
the outside air inside air intake
positionSystem voltage
11 Inside/outside air selection
damper motor (inside air)When the damper is moved to
the inside air recirculation
positionSystem voltage
When the damper is moved to
the outside air inside air intake
position0 V
12 Earth to the A/C illumination Always 0 V
90-2
TAIL LAMP, POSITION LAMP, LICENCE
PLATE LAMP AND LIGHTING MONITOR
BUZZER
TAIL LAMP, POSITION LAMP, LICENCE
PLATE LAMP AND LIGHTING MONITOR
BUZZER
FRONT FOG LAMP
FRONT FOG LAMP
ROOM LAMP AND LUGGAGE
COMPARTMENT LAMP
ROOM LAMP AND LUGGAGE
COMPARTMENT LAMP
ROOM LAMP,PERSONAL LAMP
AND LUGGAGE ROOM LAMP
ROOM LAMP,PERSONAL LAMP AND
LUGGAGE ROOM LAMP
REAR FOG LAMP
REAR FOG LAMP
HEADLAMP LEVELLING SYSTEM
HEADLAMP LEVELLING SYSTEM
TURN SIGNAL LAMP AND HAZARD
WARNING LAMP
TURN SIGNAL LAMP AND HAZARD
WARNING LAMP
BACK-UP LAMP
STOP LAMP
STOP LAMP
STOP LAMP
STOP LAMP
HORN . . . . . . . . . . . . . . . . . . . . . . . . .90-86
METER AND GAUGE
METER AND GAUGE
FUEL WARNING LAMP, OIL PRESSURE
WARNING LAMP AND BRAKE WARNING
LAMP
FUEL WARNING LAMP, OIL PRESSURE
WARNING LAMP AND BRAKE WARNING
LAMP
POWER WINDOWS
POWER WINDOWS
CENTRAL DOOR LOCKING SYSTEM
CENTRAL DOOR LOCKING SYSTEM
CENTRAL DOOR LOCKING SYSTEM
CENTRAL DOOR LOCKING SYSTEM
Continued on next page
90-3
CENTRAL DOOR LOCKING SYSTEM
CENTRAL DOOR LOCKING SYSTEM
HEATER
HEATER
MANUAL AIR CONDITIONER
MANUAL AIR CONDITIONER
WINDSHIELD WIPER AND WASHER
WINDSHIELD WIPER AND WASHER
RHD> . . . . . . . . . . . . . . . . . . . . . . . . .90-121
REAR WIPER AND WASHER
REAR WIPER AND WASHER
REAR WINDOW DEFOGGER AND
DOOR MIRROR HEATER
REAR WINDOW DEFOGGER AND
DOOR MIRROR HEATER
REMOTE CONTROLLED MIRROR
HEADLAMP WASHER . . . . . . . . . . . .90-131
SPARE CONNECTOR (FOR AUDIO)
SPARE CONNECTOR (FOR AUDIO)
CLOCK . . . . . . . . . . . . . . . . . . . . . . . .90-134
CIGARETTE LIGHTER AND ASHTRAY
ILLUMINATION LAMP . . . . . . . . . . . .90-135
ACCESSORY SOCKET . . . . . . . . . . .90-136
IMMOBILIZER SYSTEM
IMMOBILIZER SYSTEM
ABS
ABS
HEATED SEAT . . . . . . . . . . . . . . . . . .90-143
RHEOSTAT
RHEOSTAT
SUPPLEMENTAL RESTRAINT SYSTEM
(SRS)
SUPPLEMENTAL RESTRAINT SYSTEM
(SRS)
SPARE CONNECTOR (FOR FRONT
FOG LAMP) . . . . . . . . . . . . . . . . . . . .90-150
J/C
CIRCUIT DIAGRAMS90-6
J/C
M1901014201075
NOTE: IN ACTUAL VEHICLES, ANY OF THE TERMINALS CONNECTED IN J/C
ARE USED. THE TERMINAL ARRANGEMENT DESCRIBED IN THE CIRCUIT
DIAGRAM MAY NOT BE IDENTICAL TO THOSE OF THE VEHICLES.
·CENTRAL DOOR
LOCKING SYSTEM
·FRONT FOG
LAMP
·HEADLAMP
·HEADLAMP
WASHER
·POWER WINDOWS
·REAR FOG LAMP
·ROOM LAMP AND
LUGGAGE
COMPARTMENT
LAMP
·ROOM LAMP
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP ·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND
LIGHTING MONITOR
BUZZER
·TURN-SIGNAL
LAMP AND
HAZARD
WARNING LAMP
·WINDSHIELD
WIPER AND
WASHER
RELAY BOX
(FUSE )·FRONT FOG LAMP
·HEADLAMP
·HEADLAMP WASHER
·REAR FOG LAMP
·TAIL LAMP, POSITION
LAMP, LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·TURN-SIGNAL LAMP AND
HAZARD WARNING LAMP
·WINDSHIELD WIPER
AND WASHER
SPARE
CONNECTOR
(FOR AUDIO)CLOCK
·FUEL WARNING
LAMP
·INVECS-II
4A/T
·METER AND
GAUGE
RELAY BOX
(FUSE )
TURN-SIGNAL
LAMP AND
HAZARD WARNING
LAMP HEATED
SEAT
·HEATER CIGARETTE
LIGHTER AND
ASHTRAY
ILLUMINATION
LAMP
RHEOSTAT
SPARE
CONNECTOR
(FOR AUDIO) HEADLAMP
LEVELLING
SYSTEM
·FRONT
FOG LAMP
·REAR
FOG LAMP
20
22
·REAR WINDOW
DEFOGGER
AND DOOR
MIRROR HEATER ·MANUAL AIR
CONDITIONERREAR WIPER
AND WASHER
·FRONT FOG LAMP
·HEADLAMP
·HEADLAMP WASHER
·REAR FOG LAMP
·TAIL LAMP, POSITION
LAMP, LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·WINDSHIELD WIPER
AND WASHERINVECS-II
4A/T POWER
WINDOWSSTOP
LAMP·INVECS-II
4A/T
·REAR WIPER
AND WASHER
·STOP LAMP
·FRONT FOG LAMP
·HEADLAMP
·HEADLAMP WASHER
·REAR FOG LAMP
·REAR WIPER
AND WASHER
·TAIL LAMP, POSITION
LAMP, LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·TURN-SIGNAL LAMP
AND HAZARD
WARNING LAMP
·WINDSHIELD WIPER
AND WASHER·FRONT FOG LAMP
·HEADLAMP
·HEADLAMP WASHER
·POWER WINDOWS
·REAR FOG LAMP
·REAR WIPER
AND WASHER
·TAIL LAMP, POSITION
LAMP, LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·TURN-SIGNAL LAMP
AND HAZARD
WARNING LAMP
·WINDSHIELD WIPER
AND WASHER·FRONT FOG LAMP
·HEADLAMP
·HEADLAMP LEVELLING
SYSTEM
·HEADLAMP WASHER
·REAR FOG LAMP
·TAIL LAMP, POSITION
LAMP, LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·WINDSHIELD WIPER
AND WASHER
·HEATER
·MANUAL AIR
CONDITIONER
J/B (FUSE ) HEATED
SEAT ·HEADLAMP
LEVELLING
SYSTEM
·WINDSHIELD
WIPER AND
WASHER
REMOTE
CONTROLLED
MIRROR ·HEADLAMP
·HEADLAMP
WASHER
5
J/C
CIRCUIT DIAGRAMS90-7
J/C
J/C
FRONT FOG
LAMP
·FRONT
FOG LAMP·FRONT FOG
LAMP
REAR FOG
LAMP
·REAR FOG
LAMP·REAR FOG
LAMP
HEATED
SEAT
HEATED
SEATIMMOBILIZER
SYSTEM·CLOCK·HEATER TURN-SIGNAL
LAMP AND
HAZARD
WARNING LAMP·TURN-SIGNAL
LAMP AND HAZARD
WARNING LAMP
TURN-SIGNAL
LAMP AND
HAZARD
WARNING LAMP ·MANUAL AIR
CONDITIONER
·HEATER
·MANUAL AIR
CONDITIONER ·HEADLAMP·HEADLAMP
·HEADLAMP
WASHER
ACCESSORY
SOCKET·CENTRAL
DOOR LOCKING
SYSTEM
·POWER WINDOWS
·REAR WIPER
AND WASHER
·ROOM LAMP AND
LUGGAGE
COMPARTMENT
LAMP·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·WINDSHIELD WIPER
AND WASHER
HEADLAMP
LEVELLING
SYSTEM
·INVECS-II 4A/T
·METER AND
GAUGECIGARETTE
LIGHTER AND
ASHTRAY
ILLUMINATION
LAMP
SPARE
CONNECTOR
(FOR AUDIO)·REAR WINDOW
DEFOGGER AND
DOOR MIRROR
HEATERRHEOSTAT
·FRONT FOG
LAMP
·TURN-SIGNAL
LAMP AND HAZARD
WARNING LAMP ·HEADLAMP
·HEADLAMP
WASHER ·CENTRAL
DOOR LOCKING
SYSTEM
·POWER WINDOWS
·REAR WIPER
AND WASHER
·ROOM LAMP AND
LUGGAGE
COMPARTMENT
LAMP·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·WINDSHIELD WIPER
AND WASHER
J/C (6)DIAGNOSIS
CONNECTOR
DIAGNOSIS
CONNECTOR SUPPLEMENTAL
RESTRAINT
SYSTEM (SRS)ABS
·ENGINE
CONTROL
SYSTEM
·IMMOBILIZER
SYSTEM
·INVECS-II
4A/T
·FRONT FOG
LAMP·FRONT FOG
LAMP
FRONT FOG
LAMP
·TURN-SIGNAL
LAMP AND HAZARD
WARNING LAMP ·HEADLAMP
WASHER·ROOM LAMP AND
LUGGAGE
COMPARTMENT
LAMP
·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·WINDSHIELD WIPER
AND WASHER·WINDSHIELD
WIPER AND
WASHER
WINDSHIELD
WIPER AND
WASHER
DIAGNOSIS
CONNECTOR·METER AND
GAUGE
·METER AND
GAUGEMETER AND
GAUGESPARE
CONNECTOR
(FOR AUDIO)
SPARE
CONNECTOR
(FOR FRONT
FOG LAMP)·SPARE
CONNECTOR
(FOR FRONT
FOG LAMP) CLOCK(FUSE )
23
(FUSE )2
RELAY
BOX
·REAR FOG
LAMP
·REAR WIPER AND
WASHER ·ABS
·BRAKE
WARNING LAMP
·CHARGING
SYSTEM
·ENGINE
CONTROL
SYSTEM
·FUEL WARNING
LAMP
·INVECS-II
4A/T
·SUPPLEMENTAL
RESTRAINT
SYSTEM (SRS) ·OIL PRESSURE
WARNING LAMPJ/B
(FUSE )
11J/B ACCESSORY
SOCKET
REMOTE
CONTROLLED
MIRROR
J/C (4)
ABS
ABSENGINE
CONTROL
SYSTEM
ENGINE
CONTROL
SYSTEM·ENGINE
CONTROL
SYSTEM
·ENGINE
CONTROL
SYSTEMMETER AND
GAUGE
(FUSE )10RELAY
BOX
(FUSE )
8RELAY
BOX INVECS-II
4A/T
IMMOBILIZER
SYSTEM·COOLING
SYSTEM
·METER AND
GAUGE·IGNITION
SYSTEM ·ENGINE
CONTROL
SYSTEM
·METER AND
GAUGE·IGNITION
SYSTEM
J/C
CIRCUIT DIAGRAMS90-8
J/C
M1901014201086
·ROOM LAMP
AND LUGGAGE
COMPARTMENT
LAMP
·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP ·CENTRAL DOOR
LOCKING SYSTEM
·FRONT FOG LAMP
·HEADLAMP
·POWER WINDOWS
·REAR FOG LAMP
·REAR WIPER
AND WASHER·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND
LIGHTING MONITOR
BUZZER
·TURN-SIGNAL
LAMP AND
HAZARD
WARNING LAMP
·WINDSHIELD
WIPER AND WASHER
CLOCKSPARE CONNECTOR
(FOR AUDIO)
·FUEL WARNING
LAMP
·INVECS-II 4A/T
·METER AND GAUGE·FRONT FOG LAMP
·HEADLAMP
·REAR FOG LAMP
·REAR WIPER
AND WASHER
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND
LIGHTING MONITOR
BUZZER
·TURN-SIGNAL
LAMP AND
HAZARD
WARNING LAMP
·WINDSHIELD
WIPER AND WASHER
(FUSE ) RELAY BOX
22
RHEOSTAT
·CIGARETTE
LIGHTER AND
ASHTRAY
ILLUMINATION
LAMP HEADLAMP
LEVELLING
SYSTEM
·HEATER
·MANUAL AIR
CONDITIONER SPARE CONNECTOR
(FOR AUDIO)
·REAR WINDOW
DEFOGGER
AND DOOR
MIRROR
HEATERFRONT FOG
LAMPTURN-SIGNAL
LAMP AND
HAZARD
WARNING LAMP ·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER ·INVECS-II 4A/T
·METER AND GAUGE(FUSE ) RELAY BOX20
NOTE: IN ACTUAL VEHICLES, ANY OF THE TERMINALS CONNECTED IN J/C
ARE USED. THE TERMINAL ARRANGEMENT DESCRIBED IN THE CIRCUIT
DIAGRAM MAY NOT BE IDENTICAL TO THOSE OF THE VEHICLES.
REAR WIPER
AND WASHER
BACK-UP LAMP
INVECS-II 4A/T·INVECS-II 4A/T ·BACK-UP LAMP
·REAR WIPER
AND WASHER
·HEATER
·MANUAL AIR
CONDITIONER·FRONT FOG LAMP
·HEADLAMP
·REAR FOG LAMP
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND
LIGHTING MONITOR
BUZZER
·WINDSHIELD
WIPER AND WASHER ·HEADLAMP
LEVELLING
SYSTEM
(FUSE )
5
POWER
WINDOWSHEADLAMP
LEVELLING
SYSTEM HEADLAMP
REAR FOG
LAMP ACCECSSORY
SOCKET
·FRONT FOG LAMP
·HEADLAMP
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND
LIGHTING
MONITOR
BUZZER
·WINDSHIELD
WIPER AND
WASHER·FRONT FOG LAMP
·HEADLAMP
·REAR FOG LAMP
·REAR WIPER
AND WASHER
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND
LIGHTING
MONITOR
BUZZER
·TURN-SIGNAL
LAMP AND
HAZARD
WARNING LAMP
·WINDSHIELD
WIPER AND
WASHER·FRONT FOG LAMP
·HEADLAMP
·POWER WINDOWS
·REAR FOG LAMP
·REAR WIPER
AND WASHER
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND
LIGHTING MONITOR
BUZZER
·TURN-SIGNAL
LAMP AND
HAZARD
WARNING LAMP·REAR FOG LAMP
·WINDSHIELD
WIPER AND
WASHERJ/C(3) J/B
J/C
CIRCUIT DIAGRAMS90-9
J/C
J/C
·METER AND
GAUGESPARE
CONNECTOR
(FOR AUDIO)·REAR FOG
LAMP·INVECS-II
4A/T IMMOBILIZER
SYSTEMFRONT FOG
LAMP CLOCK REMOTE
CONTROLLED
MIRROR
TURN-SIGNAL
LAMP AND HAZARD
WARNING LAMP
TURN-SIGNAL
LAMP AND HAZARD
WARNING LAMP J/C (2)·FRONT FOG LAMP
·TURN-SIGNAL
LAMP AND HAZARD
WARNING LAMP ·HEADLAMP ·CENTRAL
DOOR LOCKING
SYSTEM
·POWER WINDOWS
·REAR WIPER
AND WASHER
·ROOM LAMP AND
LUGGAGE
COMPARTMENT LAMP·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·HEATER
·MANUAL AIR
CONDITIONER
·MANUAL AIR
CONDITIONER HEADLAMP
LEVELLING
SYSTEM
CIGARETTE
LIGHTER AND
ASHTRAY
ILLUMINATION
LAMP·REAR WINDOW
DEFOGGER
AND DOOR
MIRROR HEATERRHEOSTAT ·FRONT FOG LAMP
·REAR FOG LAMP
·TURN-SIGNAL
LAMP AND HAZARD
WARNING LAMP ·HEADLAMP ·CENTRAL
DOOR LOCKING
SYSTEM
·REAR WIPER
AND WASHER
·ROOM LAMP AND
LUGGAGE
COMPARTMENT LAMP·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·WINDSHIELD WIPER
AND WASHER·REAR FOG LAMP
·HEATER·WINDSHIELD WIPER
AND WASHERACCESSORY
SOCKET
·SPARE
CONNECTOR
(FOR FRONT FOG
LAMP)
(FUSE )
11J/B ·WINDSHIELD WIPER
AND WASHER
DIAGNOSIS
CONNECTOR
DIAGNOSIS
CONNECTOR
SUPPLEMENTAL
RESTRAINT
SYSTEM (SRS)ABS
·ENGINE
CONTROL
SYSTEM
·IMMOBILIZER
SYSTEM
·INVECS-II
4A/TFRONT FOG
LAMP REMOTE
CONTROLLED
MIRROR
·ROOM LAMP AND
LUGGAGE
COMPARTMENT
LAMP
·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP·FRONT FOG
LAMP SPARE
CONNECTOR
(FOR FRONT FOG
LAMP)
ABS ·FRONT FOG LAMP
·TURN-SIGNAL
LAMP AND HAZARD
WARNING LAMP ·HEADLAMP ·CENTRAL
DOOR LOCKING
SYSTEM
·POWER WINDOWS
·REAR WIPER
AND WASHER
·ROOM LAMP AND
LUGGAGE
COMPARTMENT LAMP·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMP
·TAIL LAMP,
POSITION LAMP,
LICENCE PLATE
LAMP AND LIGHTING
MONITOR BUZZER
·REAR FOG LAMP
·FRONT FOG
LAMP
REAR FOG
LAMP
·ROOM LAMP AND
LUGGAGE
COMPARTMENT
LAMP
·ROOM LAMP,
PERSONAL LAMP
AND LUGGAGE
ROOM LAMPSPARE
CONNECTOR
(FOR AUDIO) CLOCK
(FUSE )23RELAY
BOX
(FUSE )16J/B
REAR FOG
LAMP
CENTRAL DOOR
LOCKING SYSTEM
J/C (4)ABS
ABSENGINE
CONTROL
SYSTEM
ENGINE
CONTROL
SYSTEM·ENGINE
CONTROL
SYSTEM
·ENGINE
CONTROL
SYSTEMMETER AND
GAUGE·METER AND
GAU GE
·IGNITION
SYSTEM
(FUSE )
10RELAY
BOX(FUSE )8RELAY
BOX
INVECS-II
4A/TIMMOBILIZER
SYSTEM·COOLING
SYSTEM
·ENGINE
CONTROL
SYSTEM
·METER AND
GAUGE·IGNITION
SYSTEM