TOYOTA SUPRA 1995 Service Repair Manual

INTEGRATION RELAY INSPECTION
INSPECT RELAY CIRCUIT
Remove the relay from junction block and inspect the con-
nector on the junction block side, as shown in the chart.
 
 Tester connection to
terminal number 
 Condition
 
 Specified condition
 4±Ground Courtesy Switch Position OFF (Door closed) No continuity 
 4±Ground
 
 Courtesy Switch Position ON (Door opened)
 
 Continuity
 10±Ground Constant Continuity
 1±Ground Constant Battery positive voltage
 7±Ground Ignition switch position / LOCK or ACC No voltage 
 7±Ground
 
 Ignition switch position / ON
 
 Battery positive voltage
If circuit is as specified, trying replacing the relay with a new
one.
If the circuit is not as specified, inspect the circuits connected
to other parts.
DOOR KEY LOCK AND UNLOCK
SWITCH INSPECTION
See page BE±158
DOOR UNLOCK DETECTION SWITCH
INSPECTION
See page BE±145
± BODY ELECTRICAL SYSTEMINTERIOR LIGHT SYSTEMBE±29

BACK±UP LIGHT SYSTEM
PARTS LOCATION
BE±30± BODY ELECTRICAL SYSTEMBACK±UP LIGHT 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)
 
 
 
 
 
Back Up Light does not light up
 
 
 
 
 
1. GAUGE Fuse (BE±6)
2. Ignition Switch (BE±8)
3. Back±up Light Switch (M/T) (BE±31)
4. Park/ Neutral Position Switch (A/T) (AT1±Section)
5. Wire Harness
6. Bulb
 Back Up Light remains always on 1. Wire Harness 
 

Only one light does not light up
 
 

1. Wire Harness
2. Bulb
BACK UP LIGHT SWITCH INSPECTION
INSPECT SWITCH CONTINUITY 
 
 
Switch position
 
 
 
Tester connection to
terminal number
 
 
 
Specified condition
 Free 1±2 No continuity
 Push 1±2 Continuity
If continuity is not as specified, replace the switch.
PARK/NEUTRAL POSITION SWITCH
INSPECTION
See AT section
± BODY ELECTRICAL SYSTEMBACK±UP LIGHT SYSTEMBE±31

STOP LIGHT SYSTEM
PARTS LOCATION
BE±32± BODY ELECTRICAL SYSTEMSTOP LIGHT 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)
 
 
 
Stop light does not light up
 
 
 
1. STOP Fuse (BE±6)
2. Stop Light Switch (BE±33)
3. Wire Harness
4. Bulb
 
 
 
Stop light remains always on
 
 
 
1. Stop Light Switch (BE±33)
2. Wire Harness
 
 Only one light does not light up 
 
1. Wire Harness
2. Bulb
STOP LIGHT SWITCH INSPECTION
INSPECT SWITCH CONTINUITY
 
 Switch position
 
 
Tester connection to
terminal number 
 Specified condition
 
 Switch pin free
(Pedal depressed) 
 1±2
 
 Continuity
 
 Switch pin pushed in
(Pedal released) 
 3±4
 
 Continuity
If continuity is not as specified, replace the switch.
± BODY ELECTRICAL SYSTEMSTOP LIGHT SYSTEMBE±33

WIPER AND WASHER SYSTEM
PARTS LOCATION
BE±34± BODY ELECTRICAL SYSTEMWIPER AND WASHER 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)
 
 
 
 
 
 
Wipers and washers do not operate.
 
 
 
 
 
 
1. ALT Fuse (BE±5)
2. AM1 Fuse (BE±5)
3. WIPER Fuse (BE±6)
4. Ignition Switch (BE±8)
5. Wiper and Washer Switch (BE±36)
6. Wire Harness
 
 

Front wiper does not operate.
 
 

1. Front Wiper and Washer Switch (BE±36)
2. Front Wiper Motor (BE±38)
3. Wire Harness
 
 
 Rear wiper does not operate.
 
 
 
1. Rear Wiper and Washer Switch (BE±37)
2. Rear Wiper Motor and Relay (BE±39)
3. Wire Harness
 
 
 Front washer does not operate.
 
 
 
1. Front Wiper and Washer Switch (BE±36)
2. Washer Motor (BE±39)
3. Wire Harness
 
 
 Rear washer does not operate.
 
 
 
1. Rear Wiper and Washer Switch (BE±37)
2. Washer Motor (BE±39)
3. Wire Harness
± BODY ELECTRICAL SYSTEMWIPER AND WASHER SYSTEMBE±35

INT time control
switch positionVoltage
Approx. 1±3 sec.
SLOW
FAST
Approx. 10 ±15 sec.
Battery positive voltage
0 volt
Battery positive voltage
0 volt
WIPER AND WASHER SWITCH
INSPECTION
1. INSPECT FRONT WIPER AND WASHER SWITCH
CONTINUITY
 
 Switch position
 
 Tester connection to
terminal number 
 Specified condition
 Wiper OFF B4±B7 Continuity 
 Wiper OFF and
MIST 
 B7±B18
 
 Continuity
 Wiper INT B4±B7 Continuity Wiper INT and MIST B7±B18 Continuity Wiper LO B7±B18 Continuity Wiper LO and MIST B7±B18 Continuity 
Wiper HI
 
B13±B18
 
Continuity 
 Wiper HI and MIST
 
 B7±B13
B13±B18
 
 Continuity
 
 Washer ON
 
 B8±B16
 
 Continuity
If continuity is not as specified, replace the switch.
Intermittent Operation
(a) Turn the wiper switch to INT position.
(b) Turn the intermittent time control switch to FAST position.
(c) Connect the positive (+) lead from the battery to terminal B18
and the negative (±) lead to terminal B16.
(d) Connect the positive (+) lead from the voltmeter to terminal
B7 and the negative (±) lead to terminal B16, check that the
meter needle indicates battery voltage.
(e) After connecting terminal B4 to terminal B18, connect it to
terminal B16.
Then, check that the voltage rises from O V to battery positive
voltage within the times, as shown in the table.
If operation is not as specified, replace the wiper and washer
switch. BE±36
± BODY ELECTRICAL SYSTEMWIPER AND WASHER SYSTEM

Washer Linked Operation
(a) Connect the positive (+) lead from the battery to terminal B18
and the negative (±) lead to terminal B16.
(b) Connect the positive (+) lead from the voltmeter to terminal
B7 and the negative (±) lead to terminal B16.
(c) Push in the washer switch, check that the voltage changes
as shown in the table.
If operation is not as specified, replace the wiper and washer
switch.
2. INSPECT REAR WIPER AND WASHER SWITCH
CONTINUITY
 
 Switch position
 
 Tester connection to
terminal number
 
 Specified condition
 
 Washer ON (Lower)
 
 B2±B16
 
 Continuity
 Wiper OFF ± Continuity
 Wiper INT B10±B16 Continuity
 Wiper ON B1±B16 Continuity 
 

Washer ON (Upper)
 
 

B1±B2
B2±B16
 
 

Continuity
If continuity is not as specified, replace the switch.
± BODY ELECTRICAL SYSTEMWIPER AND WASHER SYSTEMBE±37

WIPER MOTOR INSPECTION
1. INSPECT FRONT WIPER MOTOR OPERATION
Low Speed
Connect the positive (+) lead from the battery to terminal 3
and the negative (±) lead to terminal 1, check that the motor
operates at low speed.
If operation is not as specified, replace the motor.
High Speed
Connect the positive (+) lead from the battery to terminal 2
and the negative (±) lead to terminal 1, check that the motor
operates at high speed.
If operation is not as specified, replace the motor.
Stopping at Stop Position
(a) Operate the motor at low speed and stop the motor operation
anywhere by disconnecting positive (+) lead from terminal 3.
(b) Connect terminals 3 and 5.
(c) Connect the positive (+) lead from the battery to terminal 6
and negative (±) lead to terminal 1, check that the motor
stops running at the stop position after the motor operates
again.
If operation is not as specified, replace the motor. BE±38
± BODY ELECTRICAL SYSTEMWIPER AND WASHER SYSTEM