1995 TOYOTA SUPRA ignition

DEFOGGER 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.
DEFOGGER WIRE INSPECTION
NOTICE:
wWhen cleaning the glass, use a soft, dry cloth, and
wipe the glass in the direction of the wire. Take care
not to damage the wires.
wDo not use detergents or glass cleaners with
abrasive ingredients.
w When measuring voltage, wind a piece of tin foil
around the top of the negative probe and press the
foil against the wire with your finger, as shown.
(a) Turn the ignition switch ON.
(b) Turn the defogger switch ON.
(c) Inspect the voltage at the center of each heat wire, as shown.
 Voltage Criteria
 Approx. 5V Okay (No break in wire)
 Approx. 10V or 0V Broken wire
HINT: If there is approximately 10 V, the wire is broken be-
tween the center of the wire and the positive (+) end. If there
is no voltage, the wire is broken between the center of the
wire and ground.
(d) Place the voltmeter positive (+) lead against the defogger
positive (+) terminal.
(e) Place the voltmeter negative (±) lead with the foil strip against
the heat wire at the positive (+) terminal end and slide it
toward the negative (±) terminal end.
(f) The point where the voltmeter deflects from zero to several
V is the place where the heat wire is broken.
HINT: If the heat wire is not broken, the voltmeter indicates
O V at the positive (+) end of the heat wire but gradually in-
creases to about 12 V as the meter probe is moved to the oth-
er end.
± BODY ELECTRICAL SYSTEMDEFOGGER SYSTEMBE±65

DEFOGGER WIRE REPAIR
(a) Clean the broken wire tips with a grease, wax and silicone
remover.
(b) Place the masking tape along both sides of the wire to be
repaired.
(c) Thoroughly mix the repair agent (DuPont paste No. 4817).
(d) Using a fine tip brush, apply a small amount to the wire.
(e) After a few minutes, remove the masking tape.
(f) Allow the repair to stand at least 24 hours.
MIRROR DEFOGGER INSPECTION
1. INSPECT MIRROR DEFOGGER OPERATION
(a) Connect the positive (+) lead from the battery to terminal 2
and the negative (±) lead to terminal 1.
(b) Check that the mirror becomes warm.
HINT: It will take a short time for the mirror to become warm.
If the mirror does not become warm, replace the mirror as-
sembly.
2. INSPECT MIRROR DEFOGGER CIRCUIT
Disconnect the connector from the outside mirror and inspect
the connector on the wire harness side, as shown.
 
 
Tester connection to
terminal number 
 Condition
 
 Specified condition
 1±Ground Constant Continuity 
 2±Ground
 
 Ignition switch ON (Defogger switch OFF)
 
 No voltage
 2±Ground Ignition switch ON (Defogger switch ON) Battery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts. BE±66
± BODY ELECTRICAL SYSTEMDEFOGGER 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)
 
 
 
 
 
 
*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

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

A/C noise.Whining noise occurs when A/C is operating.
Fuel gauge noise.
NoiseNOISE PRODUCED WHEN ENGINE STARTS
Whistling noise which becomes high±pitched
when accelerator strongly depressed, disap-
pears shortly after engine stops.
Clicking sound heard when horn button is
pressed, then released. Whirring/grating sound
when pushed continuously.
Scratching noise occurs during sudden accelera-
tion, driving on rough roads or when ignition
switch is turned on.
Alternator noise.
Horn noise.
Ignition noise.
Turn signal noise.
Washer noise.
Murmuring sound, stops when engine stops.
Tick±tock noise, occurs in co±ordination with
blinking of flasher.
Noise occurs during window washer operation.
Scraping noise in time with wiper beat.
Scratching noise occurs while engine is running,
continues a while even after engine stops.
Other type of noise.
Engine coolant temp. gauge noise.
Wiper noise.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±109

Display E:
ANTI±THEFT SYSTEM
operation condition.
(ID number input error
10 times or more.)Display A:
ID Number is set.Display B
Anti±theft
SystemTROUBLESHOOTING FOR ANTI±THEFT SYSTEM
Turn Ignition key from Lock position to ACC position.
Cancel ID number, refer to each malfunction item.
Take to designated radio
service station.
[ISEC] Display Disappears
After 1 Second.
Normal operation
Refer to each
malfunction item.
(Liquid Crystal Display (LCD) for Audio System)
Cancel ID number, refer to each malfunction item.
ANTI±THEFT SYSTEM operation condition.
[ID number input error 9 times or less.]
Input ID number to cancel ANTI±THEFT SYSTEM, and check display.
Radio switch ON.
ANTI±THEFT SYSTEM not
cancelled.
(ID number input error 9
times or less.)
ANTI±THEFT SYSTEM cancelled.
Check audio system again.
Radio Display
Display BDisplay D
Radio switch ON.
Display EDisplay C"ADisplay BDisplay A " B
Display D
Radio switch ON.Take to designated radio
service station.Refer to each
malfunction item.
Normal
operation
Normal operation.
ID number
input error
time
Blank,
No Illumination
Display B
Display E
Display DDisplay ADisplay C
HINT:
a) Refer to O/M for operation details of ANTI±THEFT SYSTEM.
b) When the ID number has been cancelled, reset the same number after completing the operation,
or inform the customer that it has been cancelled.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±111

ANTENNA ROD REMOVAL AND
INSTALLATION
1. REMOVE ANTENNA ROD
HINT: Do this operation with the negative (±) terminal cable
connected to the battery.
(a) Turn the ignition switch to ºLOCKº position.
(b) Remove the antenna nut.
(c) P r e s s t h e º A M º b u t t o n o n t h e r a d i o r e c e i v e r, a n d
simultaneously turn the ignition switch to ºACCº position.
HINT:
wThe rod will extend fully and be released from the motor
antenna.
wAfter removing the antenna rod, leave the ignition switch
at ºACCº.
NOTICE: To prevent body damage when the antenna rod
is released, hold the rod while it comes out.
2. INSTALL ANTENNA ROD
(a) Insert the cable of the rod until it reaches the bottom.
HINT:
wWhen inserting the cable, the teeth on the cable must
face toward the rear of the vehicle.
wInsert the cable approx. 400 mm.
(b) Wind the cable to retract the rod by turning the ignition switch
to ºLOCKº position.
HINT:
wIf the ignition switch is already in ºLOCKº position, do
step 1 (c) first, then turn the ignition switch to ºACCº
position.
wIn case the cable is not wound, twist it as shown in the
illustration.
wEven if the rod has not retracted fully, install the antenna
nut and inspect the antenna rod operation. It will finally
retract fully.
(c) Inspect the antenna rod operation by pushing the radio wave
band select buttons. BE±112
± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

MOTOR ANTENNA CONTROL RELAY
INSPECTION
INSPECT RELAY CIRCUIT
Disconnect the connector from the relay and inspect connec-
tor on wire harness side, as shown in the chart.
 
 
Tester connection to
terminal number 
 Condition 
 Specified condition
 6±Ground Constant Continuity
 2±3 Constant Continuity 
 1±Ground
 
 Constant
 
 Battery positive voltage
 4±Ground Ignition switch position ON Battery positive voltage
 5±Ground Ignition switch position ACC or ON Battery positive voltage
 
 7±Ground
 
 Ignition switch position ACC or ON
and radio switch ON 
 Battery positive voltage
 8±Ground Ignition switch position ACC or ON Battery positive voltage
If circuit is not as specified, replace the relay.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±113