TOYOTA SUPRA 1995 Service Repair Manual

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

POWER MAIN RELAY INSPECTION
INSPECT RELAY CONTINUITY
 
 Condition
 
 
Tester connection to
terminal number 
 Specified condition
 Constant 1±2 Continuity 
 Apply B+ between
terminals 1 and 2.
 
 3±5
 
 Continuity
If continuity is not as specified, replace the relay.
± BODY ELECTRICAL SYSTEMPOWER WINDOW CONTROL SYSTEMBE±73

POWER SEAT CONTROL SYSTEM
PARTS LOCATION
BE±74± BODY ELECTRICAL SYSTEMPOWER SEAT CONTROL SYSTEM

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) 
 
 
 
Power seat does not operate
 
 
 
 
1. POWER Fuse (BE±5)
2. DOOR Fuse (BE±6)
3. Wire Harness
4. Power Seat Switch (BE±75)
 
 
 ºSlide operationº does not operate
 
 
 
1. Power Seat Switch (BE±75)
2. Wire Harness
3. Sliding Motor (BE±76)
 
 
 ºReclining operationº does not operate
 
 
 
1. Power Seat Switch (BE±75)
2. Wire Harness
3. Reclining Motor (BE±77)
POWER SEAT SWITCH INSPECTION
INSPECT SWITCH CONTINUITY
Slide
 
 Switch position
 
 Tester connection to
terminal number
 
 Specified condition
 
 
 
Forward
 
 
 
A1±A3
A2±A4
 
 
 
Continuity
 
 
Off 
 
A1±A3
A1±A4 
 
Continuity
 
 Back 
 
A1±A4
A2±A3 
 Continuity
Reclining 
 
 
Switch position
 
 
 
Tester connection to
terminal number
 
 
 
Specified condition
 
 
Forward 
 
A1±B1
A2±B2 
 
Continuity
 
 Off 
 
A1±B1
A1±B2 
 Continuity
 
 Back 
 
A1±B2
A2±B1 
 Continuity
If continuity is not as specified, replace the switch.
± BODY ELECTRICAL SYSTEMPOWER SEAT CONTROL SYSTEMBE±75

SLIDE MOTOR INSPECTION
1. INSPECT MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal 2
and the negative (±) lead to terminal 1, check that the motor
turns counterclockwise.
(b) Reverse the polarity, check that the motor turns clockwise.
If operation is not as specified, replace the motor.
2. INSPECT PTC THERMISTOR OPERATION
(a) Separate power seat adjuster from front seat.
(b) Connect the positive (+) lead from the battery to terminal 2,
the positive (+) lead from the ammeter to terminal 1, and the
negative (±) lead to battery negative (±) terminal, and move
the seat front end position.
(c) Continue to apply voltage, check the current changes to less
than 1 ampere within 4 to 90 seconds.
(d) Disconnect the lead from terminals.
(e) Approximately 60 seconds later, connect the positive (+) lead
from battery to terminal 1 and the negative (±) lead to terminal
2, check that the seat begins to move backwards.
If operation is not as specified, replace the motor. BE±76
± BODY ELECTRICAL SYSTEMPOWER SEAT CONTROL SYSTEM

RECLINING MOTOR INSPECTION
1. INSPECT MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal 2
and negative (±) lead to terminal 1 and check that the motor
turns counterclockwise.
(b) Reverse the polarity, check that the motor turns clockwise.
If operation is not as specified, replace the motor.
2. INSPECT PTC THERMISTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal 2.
(b) Connect the positive (+) lead from the ammeter to terminal 1
and the negative (±) lead to battery negative (±) terminal.
(c) Check that the seat back is reclined to the most forward
position.
(d) Continue to apply voltage, check the current change to less
than 1 ampere within 4 to 90 seconds.
(e) Disconnect the lead from terminals.
(f) Approximately 60 seconds later, connect the positive (+) lead
from the battery to terminal 1 and the negative (±) lead to
terminal 2, check that the seat back starts to fall backwards.
If operation is not as specified, replace the motor.
± BODY ELECTRICAL SYSTEMPOWER SEAT CONTROL SYSTEMBE±77

POWER MIRROR CONTROL
SYSTEM
PARTS LOCATION
BE±78± BODY ELECTRICAL SYSTEMPOWER MIRROR CONTROL SYSTEM