1995 TOYOTA SUPRA relay

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) 
 
 
Only one light does not light up.
 
 
 
1. Bulb
2. Wire Harness
 
 
 
Interior light does not light up (All).
 
 
 
1. DOME Fuse (BE±5)
2. Integration Relay (BE±29)
3. Wire Harness
 
 
 
 
ºIlluminated Entry Systemº does not operate.
 
 
 
 
1. Integration Relay (BE±29)
2. Door Courtesy Switch (BE±28)
3. Door Key Lock and Unlock Switch (BE±158)
4. Door Unlock Detection Switch (BE±145)
5. Wire Harness
 
 
 Front personal light does not light up.
 
 
 
1. Bulb
2. Front Personal Light (BE±27)
3. Wire Harness
 
 Luggage room light does not light up.
 
 1. Bulb
2. Luggage Room Light Switch (BE±28)
PERSONAL LIGHT SWITCH INSPECTION
1. INSPECT INTERIOR LIGHT CONTINUITY
 
 Switch position
 
 Tester connection to
terminal number 
 Specified condition
 
 DOOR 
 1±3 
 Continuity
 OFF ± No continuity
2. INSPECT PERSONAL LIGHT CONTINUITY
 
 Switch position
 
 Tester connection to
terminal number 
 Specified condition
 
OFF 
± 
No continuity 
 *ON
 
 1±2
 
 Continuity
* Set the interior light switch to OFF or DOOR.
If continuity is not as specified, replace the light assembly or
bulb.
± BODY ELECTRICAL SYSTEMINTERIOR LIGHT SYSTEMBE±27

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

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

2. INSPECT REAR WIPER MOTOR AND RELAY
OPERATION
(a) Connect the positive (+) lead from the battery to terminal 1,
and the negative (±) lead to terminal 3 and the motor body,
check that the motor operates.
(b) Disconnect the negative (±) lead from terminal 3, check that
the motor stops running at the stop position.
If operation is not as specified, replace the motor and relay.
Intermittent Operation
Connect the positive (+) lead from the battery to terminal 1,
and the negative (±) lead to terminal 2 and the motor body,
check that the motor operates intermittently for 9±15 se-
conds.
If operation is not as specified, replace the motor and relay.
WASHER MOTOR INSPECTION
INSPECT MOTOR OPERATION
Front Washer
Connect the positive (+) lead from the battery to terminal 2
and the negative (±) lead to terminal 1, check that the motor
operates.
NOTICE: These tests must be performed quickly (within
20 seconds) to prevent the coil from burning out.
If operation is not as specified, replace the motor.
Rear Washer
Connect the positive (+) lead from the battery to terminal 2
and the negative (±) lead to terminal 3, check that the motor
operates.
NOTICE: These tests must be performed quickly (within
20 seconds) to prevent the coil from burning out.
If operation is not as specified, replace the motor.
± BODY ELECTRICAL SYSTEMWIPER AND WASHER SYSTEMBE±39

WARNING LIGHTS
 Trouble Parts name (See page)
 
 
 
 
 
Warning lights do not light up
(Except Discharge and Door Open)
 
 
 
 
 
1. Bulb
2. IGN Fuse (BE±6)
3. Ignition Switch (BE±8)
4. Meter Circuit Plate (BE±44)
5. Wire Harness
6. Generator
 
 
 
 
 
 
Brake Warning Light does not light up
 
 
 
 
 
 
1. Bulb
2. Brake Fluid Level Warning Switch (BE±52)
3. Parking Brake Switch (BE±52)
4. Bulb Check Relay
5. Meter Circuit Plate (BE±44)
6. Wire Harness
 
 
 
 
 
Seat Belt Warning Light does not light up
 
 
 
 
 
1. Bulb
2. Seat Belt Buckle Switch (BE±56)
3. Integration Relay (BE±55)
4. Meter Circuit Plate (BE±44)
5. Wire Harness
 
 
 
 
Engine Oil Level Warning Light does not light up
 
 
 
 
1. Bulb
2. Engine Oil Level Switch (BE±51)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
 
 
 
Low Oil Pressure Warning Light does not light up
 
 
 
1. Bulb
2. Low Oil Pressure Warning Switch (BE±51)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
 
 
 
 
 
 
 
Door Open Warning Light does not light up
 
 
 
 
 
 
 
1. Bulb
2. DOME Fuse (BE±5)
3. Door Courtesy Switch (BE±54)
4. Luggage Room Light Switch (BE±28)
5. Integration Relay
6. Meter Circuit Plate (BE±44)
7. Wire Harness
 
 
 
 
Master Warning Light does not light up
 
 
 
 
1. Bulb
2. Telltale Light (BE±48)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
BE±42± BODY ELECTRICAL SYSTEMCOMBINATION METER

INDICATOR LIGHTS
TroubleParts name (See page) 
 
 SRS Indicator Light does not light up
 
 
 
1. Bulb
2. Wire Harness
3. Center Air Bag Sensor (RS Section)
 
 
 
ABS Indicator Light does not light up
 
 
 
1. Bulb
2. Wire Harness
3. Traction ECU (BR Section)
 
 
 
Malfunction Indicator Light does not light up
 
 
 
1. Bulb
2. ECM (EG Section)
3. Wire Harness
 
 
 
TRAC OFF Indicator Light does not light up
 
 
 
1. Bulb
2. Traction Solenoid Relay (BR Section)
3. Traction ECU (BR Section)
4. Wire Harness
 
 
 
Security Indicator Light does not light up
 
 
 
1. Light Emitting Diode
2. Theft Deterrent and Door Lock ECU (BE±123)
3. Wire Harness
 
 
 
 
A/T Shift Position Indicator Light does not light up
 
 
 
 
1. Bulb
2. Park/Neutral Position Switch (AT1 Section)
3. Light Control Rheostat (BE±54)
4. Meter Circuit Plate (BE±44)
5. Wire Harness
 
 
 
 
MANU Indicator Light does not light up
 
 
 
 
1. Bulb
2. ECM (EG Section)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
 
 
 
 
O/D OFF Indicator Light does not light up
 
 
 
 
1. Bulb
2. O/D Main Switch
3. ECM (EG Section)
4. Meter Circuit Plate (BE±44)
5. Wire Harness
 
 
 
 
TRAC Indicator Light does not light up
 
 
 
 
1. Bulb
2. ABS and Traction ECU
3. Meter Circuit Plate (BE±44)
4. Wire Harness
 
 
 
Turn Indicator Light does not light up
 
 
 
1. Bulb
2. Turn Signal and Hazard Warning System (BE±20)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
 
 
 
 
High Beam Indicator Light does not light up
 
 
 
 
1. Bulb
2. Headlight System (BE±10)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
 
 
 
CRUISE Indicator Light does not light up
 
 
 
1. Bulb
2. Cruise Control ECU (BE±170)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
± BODY ELECTRICAL SYSTEMCOMBINATION METERBE±43

SEAT BELT WARNING INSPECTION
1. INSPECT INTEGRATION RELAY OPERATION
(a) Connect the positive (+) lead from the battery to terminals 1
and 7.
(b) Connect the positive (+) lead from the battery to terminal 9
through a 3.4W test bulb.
(c) Check that the test bulb lights up and buzzer sounds for 4±8
seconds when the negative (±) lead from the battery is
connected to terminal 10.
(d) Check that the buzzer sounding in (c) stops when the
negative (±) lead from the battery is connected to terminal 8.
If operation is not as specified, replace the integration relay.
2. INSPECT RELAY CIRCUIT
Remove the relay from the junction block No.1 and inspect
the connectors on the junction block side.
 
 Tester connection to
terminal number 
 Condition
 
 Specified condition
 4±Ground Driver's door open Continuity 
 4±Ground
 
 Driver's door close
 
 No continuity
 5±Ground Ignition key Set Continuity
 5±Ground Ignition key remove No continuity
 8±Ground Driver's seat belt fasten Continuity 
 8±Ground
 
 Driver's seat belt unfasten
 
 No continuity
 10±Ground Constant Continuity
 1±Ground Constant Battery positive voltage
 9±Ground Ignition switch position ON Battery positive voltage 
 9±Ground
 
 Ignition switch position LOCK or ACC
 
 No voltage
If circuit is not as specified, try replacing the relay with a new
one.
± BODY ELECTRICAL SYSTEMCOMBINATION METERBE±55

SEAT HEATER RELAY INSPECTION
INSPECT RELAY CONTINUITY
 
 Condition
 
 
Tester connection to
terminal number 
 Specified condition
 Constant 1±3 Continuity 
 Apply B+ between
Terminals 1 and 3.
 
 2±4
 
 Continuity
If continuity is not as specified, replace the relay. BE±60
± BODY ELECTRICAL SYSTEMSEAT HEATER SYSTEM