1995 TOYOTA SUPRA window

PREPARATION
SST (SPECIAL SERVICE TOOLS)
09843±18020Diagnosis Check Wire
09808±14010Fuel Sender Gauge Tool Assy
09950±50010Puller C Set
RECOMMENDED TOOLS
09082±00050TOYOTA Electrical Tester Set


EQUIPMENT
 
 Voltmeter
 
 
 Ammeter 
 Ohmmeter 
 Test lead 
 Thermometer Engine oil level warning switch, Seat heater
 Syphon Brake fluid level warning switch
 Oil bath Engine oil level warning switch
 Bulb (3.4 W) Fuel sender gauge, Seat belt warning relay Bulb (21 W) Turn signal flasher relay Dry cell battery Fuel sender gauge 
 Heat light
 
 Seat heater
 Torque wrench 
 Masking tape Rear window defogger wire
 Tin foil Rear window defogger wire
SSM (SPECIAL SERVICE MATERIAL)
 

DuPont Paste No. 4817 or
equivalent
 

Rear window defogger
 
 
equivalent 
 
± BODY ELECTRICAL SYSTEMPREPARATIONBE±3

TROUBLESHOOTING
The table below will be useful for you in troubleshooting these electrical problems. The most likely causes
of the malfunction are shown in the order of their probability. Inspect each part in the order shown, and
replace the part when it is found to be faulty.
 Trouble Parts name (See page)
 
 
 
 
 
 
All defogger systems do not operate
 
 
 
 
 
 
1. GAUGE Fuse (BE±6)
2. DEFOG Fuse (BE±6)
3. Defogger Relay (BE±65)
4. Defogger Switch (BE±64)
5. A/C Amplifier (AC Section)
6. Wire Harness
 
 
Rear window defogger does not operate 
 
1. Defogger Wires (BE±65)
2. Wire Harness
 
 
 
Mirror defogger does not operate
 
 
 
1. MIR±HTR Fuse (BE±6)
2. Mirror Defogger (BE±66)
3. Wire Harness
DEFOGGER SWITCH INSPECTION
INSPECT SWITCH OPERATION
(a) Connect the positive (+) lead from the voltmeter to terminal
7 of connector B and the negative (±) lead from voltmeter to
terminal 10 of connector B.
(b) When the switch is off, the voltage should be approx. 12 V.
(c) When the switch is on, check that the indicator light lights up
and that the voltage is less than 1 V.
(d) After 15 minutes, check that the switch is off and the voltage
is approx. 12 V.
A/C AMPLIFIER INSPECTION
See A/C section BE±64
± BODY ELECTRICAL SYSTEMDEFOGGER SYSTEM

POWER WINDOW CONTROL
SYSTEM
PARTS LOCATION
± BODY ELECTRICAL SYSTEMPOWER WINDOW CONTROL SYSTEMBE±67

TROUBLESHOOTING
The table below will be useful for you in troubleshooting these electrical problems. The most likely causes
of the malfunction are shown in the order of their probability. Inspect each part in the order shown, and
replace the part when it is found to be faulty.
 Trouble Parts name (See page)
 
 
 
 
 
 
*1 Power window does not operate.
 
 
 
 
 
 
1. ALT Fuse (BE±5)
2. POWER Fuse (BE±5)
3. AM 1 Fuse (BE±5)
4. DOOR Fuse (BE±6)
5. Ignition Switch (BE±8)
6. Power Window Master Switch (BE±69)
7. Wire Harness
 
 
 
 
 
*2 Power Window does not operate.
 
 
 
 
 
1. GAUGE Fuse (BE±6)
2. Power Main Relay (BE±73)
3. Ignition Switch (BE±8)
4. Power Window Master Switch (BE±69)
5. Wire Harness
 ºOne Touch Power Window Systemº does not operate. 1. Power Window Master Switch (BE±69) 
 
 
 
Only one window glass does not move.
 
 
 
 
1. Power Window Master Switch (BE±69)
2. Power Window Switch (BE±71)
3. Power Window Motor (BE±71)
4. Wire Harness
 ºWindow Lock Systemº does not operate. 1. Power Window Master Switch (BE±69) 
 Illumination does not light up.
 
 1. Power Window Master Switch (BE±69)
*1 Power door lock does not operate.
*
2 Power door lock is normal. BE±68
± BODY ELECTRICAL SYSTEMPOWER WINDOW CONTROL SYSTEM

POWER WINDOW MASTER SWITCH
INSPECTION
1. INSPECT SWITCH CONTINUITY
Driver 's Switch
 
 
Switch position 
 
Tester connection to
terminal number 
 
Specified condition
 

UP 

4±10
8±9 

Continuity
 
 OFF
 
 8±10
8±9
 
 Continuity
 
 DOWN
 
 4±9
8±10
 
 Continuity
Passenger 's Switch (Window unlock)
 
 Switch position
 
 
Tester connection to
terminal number 
 Specified condition
 
 UP 
 
4±5
7±8 
 Continuity
 
 OFF 
 
5±8
7±8 
 Continuity
 
 DOWN 
 
4±7
5±8 
 Continuity
Passenger 's Switch (Window lock)
 
 Switch position`
 
 Tester connection to
terminal number 
 Specified condition
 UP 4±5 Continuity OFF 5±7 Continuity DOWN 4±7 Continuity
If continuity is not as specified, replace the switch.
2. INSPECT SWITCH ILLUMINATION
Connect the positive (+) lead from the battery to terminal 4
and the negative (±) lead to terminal 8, check that the illu-
mination lights up.
If operation is not as specified, replace the master switch.
± BODY ELECTRICAL SYSTEMPOWER WINDOW CONTROL SYSTEMBE±69

3. INSPECT ONE TOUCH POWER WINDOW SYSTEM
Using an ammeter.
(a) Disconnect the connector from the master switch.
(b) Connect the positive (+) lead from the ammeter to terminal 9
on the wire harness side connector and the negative (±) lead
to negative terminal of the battery.
(c) Connect the positive (+) lead from the battery to terminal 10
on the wire harness side connector.
(d) As the window goes down, check that the current flow is
approximately 7 A.
(e) Check that the current increases up to approximately 14.5 A
or more when the window stops going down.
HINT: The circuit breaker opens some 4±90 seconds after the
window stops going down, so that check must be made be-
fore the circuit breaker operates.
If the operation is as specified, replace the master switch.
Using an ammeter with a current±measuring probe.
(a) Remove the master switch with connector connected.
(b) Attach a current±measuring probe to terminal 4 of the wire
harness.
(c) Turn the ignition switch ON and set the power window switch
in the down position.
(d) As the window goes down, check that the current flow is
approximately 7 A.
(e) Check that the current increases up to approximately 14.5 A
or more when the window stops going down.
HINT: The circuit breaker opens some 9±90 seconds after the
window stops going down, so that check must be made be-
fore the circuit breaker operates.
If operation is as specified, replace the master switch. BE±70
± BODY ELECTRICAL SYSTEMPOWER WINDOW CONTROL SYSTEM

POWER WINDOW SWITCH INSPECTION
INSPECT SWITCH CONTINUITY
 
 Switch position
 
 
Tester connection to
terminal number 
 Specified condition
 
 UP
 
 
1±4
3±5 
 Continuity
 
 OFF
 
 1±2
3±5 
 Continuity
 
 DOWN
 
 1±2
3±4 
 Continuity
If continuity is not as specified, replace the switch.
POWER WINDOW MOTOR INSPECTION
1. INSPECT MOTOR OPERATION
Driver 's Door
(a) Connect the positive (+) lead from the battery to terminal 1
and the negative (±) lead to terminal 2, check that the motor
turns clockwise.
(b) R e v e r s e t h e p o l a r i t y, c h e c k t h a t t h e m o t o r t u r n s
counterclockwise.
If operation is not as specified, replace the motor.
Passenger 's Door
(a) Connect the positive (+) lead from the battery to terminal 1
and the negative (±) lead to terminal 2, check that the motor
turns clockwise.
± BODY ELECTRICAL SYSTEMPOWER WINDOW CONTROL SYSTEMBE±71

(b) R e v e r s e t h e p o l a r i t y, c h e c k t h a t t h e m o t o r t u r n s
counterclockwise.
If operation is not as specified, replace the motor.
2. INSPECT PTC OPERATION
Driver 's Door
(a) Disconnect the connector from the master switch.
(b) Connect the positive (+) lead from the battery to terminal 9
and the negative (±) lead to terminal 10 on the wire harness
side connector and raise the window to the fully closed
position.
(c) Continue to apply voltage, check that there is a PTC
operation noise within approximately 4 to 90 seconds.
(d) Reverse the polarity, check that the window begins to
descend within approximately 60 seconds.
If operation is not as specified, replace the motor.
Passenger 's Door
(a) Disconnect the connector from the power window switch.
(b) Connect the positive (+) lead from the battery to terminal 2
and the negative (±) lead to terminal 5 on the wire harness
side connector, and raise the window to the fully closed
position.
(c) Continue to apply voltage, check that there is a PTC
operation noise within approximately 4 to 90 seconds.
(d) Reverse the polarity, check that the window begins to
descend within approximately 60 seconds.
If operation is not as specified, replace the motor. BE±72
± BODY ELECTRICAL SYSTEMPOWER WINDOW CONTROL SYSTEM