1995 TOYOTA SUPRA fog light

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

FOG LIGHT SYSTEM
PARTS LOCATION
± BODY ELECTRICAL SYSTEMFOG LIGHT SYSTEMBE±23

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)
 
 
 
 
Fog light does not light with light control SW HEAD
(Headlight is normal).
 
 
 
 
1. HEAD Fuse (BE±5)
2. Fog Light Relay (BE±25)
3. Fog Light Switch (BE±24)
4. Wire Harness
 
 
Fog light does not light with light control SW HEAD
(Headlight does not light). 
 
1. Inspect Headlight system (BE±10)
2. Wire Harness
 Only one light does not light. 1. Bulb
2. Wire Harness
FOG LIGHT AIM ADJUSTMENT
Adjust Screw: Vertical Direction
FOG LIGHT SWITCH INSPECTION
INSPECT SWITCH CONTINUITY
 
 Switch position 
 
Tester connection to
terminal number 
 Specified condition
 OFF ± No continuity
 ON A6±A7 Continuity
If continuity is not as specified, replace the switch. BE±24
± BODY ELECTRICAL SYSTEMFOG LIGHT SYSTEM

FOG LIGHT 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 SYSTEMFOG LIGHT SYSTEMBE±25

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

EQUIPMENT
 Battery specific gravity gauge Except maintenance±free battery
 Torque wrench 
 Vernier calipers Rotor (Slip ring)
ON±VEHICLE INSPECTION
1. CHECK BATTERY ELECTROYTE LEVEL AND VOLTAGE
(a) Check the electrolyte quantity of each cell.
Maintenance±Free Battery:
If under the lower level, replace the battery (or add distilled
water if possible.). Need to check the charging system.
Except Maintenance±Free Battery:
If under the lower level, add distilled water.
(b) Except Maintenance±Free Battery:
Check the specific gravity of each cell.
Standard specific gravity:
1.27±1.29 at 205C (685F)
If the specific gravity is less than specification, charge the
battery.
(c) Maintenance±Free Battery:
Measure the battery voltage between the negative (±) and
positive (+) terminals of the battery.
Standard voltage:
12.7±12.9 V at 205C (685F)
HINT:
wBefore measuring the voltage, turn the ignition switch
OFF and turn off the electrical systems (headlight,
blower motor, rear defogger etc.) for 60 seconds to
remove the surface charge.
wIf the vehicle has been running, wait 5 minutes or more
after the vehicle stops before measuring the battery
voltage.
If the voltage is less than specification, charge the battery.
HINT: Check the indicator as shown in the illustration.
± CHARGING SYSTEMPREPARATIONCH±3

EQUIPMENT
 Battery specific gravity gauge Except maintenance±free battery
 Torque wrench 
 Vernier calipers Rotor (Slip ring)
ON±VEHICLE INSPECTION
1. CHECK BATTERY ELECTROYTE LEVEL AND VOLTAGE
(a) Check the electrolyte quantity of each cell.
Maintenance±Free Battery:
If under the lower level, replace the battery (or add distilled
water if possible.). Need to check the charging system.
Except Maintenance±Free Battery:
If under the lower level, add distilled water.
(b) Except Maintenance±Free Battery:
Check the specific gravity of each cell.
Standard specific gravity:
1.27±1.29 at 205C (685F)
If the specific gravity is less than specification, charge the
battery.
(c) Maintenance±Free Battery:
Measure the battery voltage between the negative (±) and
positive (+) terminals of the battery.
Standard voltage:
12.7±12.9 V at 205C (685F)
HINT:
wBefore measuring the voltage, turn the ignition switch
OFF and turn off the electrical systems (headlight,
blower motor, rear defogger etc.) for 60 seconds to
remove the surface charge.
wIf the vehicle has been running, wait 5 minutes or more
after the vehicle stops before measuring the battery
voltage.
If the voltage is less than specification, charge the battery.
HINT: Check the indicator as shown in the illustration.
± CHARGING SYSTEMON±VEHICLE INSPECTIONCH±3

Heat the component that is the likely cause of the mal-
function with a hair dryer or similar object. Check to see
if the malfunction occurs.
NOTICE:
(1) Do not heat to more than 60°C (140°F). (Temperature
limit that no damage is done to the component).
(2) Do not apply heat directly to parts in the ECU.
HEAT METHOD: When the problem seems to occur when the suspect area is heated
WATER SPRINKLING METHOD: When the malfunction seems to occur on a rainy
day or in a high±humidity condition.
OTHER: When a malfunction seems to occur when electrical load is excessive.
Sprinkle water onto the vehicle and check to see if the
malfunction occurs.
NOTICE:
(1) Never sprinkle water directly into the engine compart-
ment, but indirectly change the temperature and humidity
by applying water spray onto the radiator front surface.
(2) Never apply water directly onto the electronic compo-
nents.
(Service hint)
If a vehicle is subject to water leakage, the leaked water may
contaminate the ECU. When testing a vehicle with a water leak-
age problem, special caution must be used.
Turn on all electrical loads including th3e heater blower,
head lights, rear window defogger, etc. and check to see
if the malfunction occurs.
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMSIN±25