TOYOTA SUPRA 1995 Service Repair Manual

DAYTIME RUNNING LIGHT RELAY No.2
INSPECTION
INSPECT RELAY CONTINUITY 
 Condition
 
 Tester connection to
terminal number 
 Specified condition
 Constant 3±4 Continuity 
 Apply B+ between
terminals 3 and 4. 
 1±2
 
 Continuity
If continuity is not as specified, replace the relay.
DAYTIME RUNNING LIGHT RELAY No.3
INSPECTION
INSPECT RELAY CONTINUITY
 
 
Tester connection to
terminal number 
 Condition
 
 Specified condition
 A1±B3 Constant Continuity
 A3±A5 Constant Continuity
 B3±B4 Constant Continuity 
 A2±A5
 
 Apply battery positive voltage
between terminal A1 and B3. 
 Continuity
 
 B1±B2
 
 Apply battery positive voltage
between terminal B3 and B4. 
 Continuity
If continuity is not as specified, replace the relay.
± BODY ELECTRICAL SYSTEMHEADLIGHT AND TAILLIGHT SYSTEMBE±19

TURN SIGNAL AND HAZARD
WARNING SYSTEM
PARTS LOCATION
BE±20± BODY ELECTRICAL SYSTEMTURN SIGNAL AND HAZARD WARNING 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)
 
 
 
ºHazardº and ºTurnº do not light up
 
 
 
1. Hazard Warning Switch (BE±22)
2. Turn Signal Flasher (BE±22)
3. Wire Harness
 
 
 
The flashing frequency is abnormal
 
 
 
1. Bulb
2. Turn Signal Flasher (BE±22)
3. Wire Harness
 Hazard warning light does not light up
(Turn is normal) 1. HAZ±HORN Fuse (BE±5)
2. Wire Harness
 
 Hazard warning light does not light up in one direction
 
 1. Hazard Warning Switch (BE±22)
2. Wire Harness
 
 
 
 
*1 Turn signal does not light up
 
 
 
 
1. Ignition Switch (BE±8)
2. TURN Fuse (BE±6)
3. Turn Signal Switch (BE±21)
4. Wire Harness
 
 
 
*2 Turn signal does not light up
 
 
 
1. TURN Fuse (BE±6)
2. Turn Signal Switch (BE±21)
3. Wire Harness
 
 Turn signal does not light up in one direction
 
 
1. Turn Signal Switch (BE±21)
2. Wire Harness
 
 Only one bulb does not light up
 
 
1. Bulb
2. Wire Harness
*1: Combination Meter, Wiper and Washer do not operate.
*
2: Combination Meter, Wiper and Washer are normal.
TURN SIGNAL SWITCH INSPECTION
INSPECT SWITCH CONTINUITY 
 Switch position
 
 Tester connection to
terminal number
 
 Specified condition
 
 Left turn
 
 A1 ± A5
 
 Continuity 
 Neutral
 
 ±
 
 No continuity
 Right turn A1 ± A8 Continuity
If continuity is not as specified, replace the switch.
± BODY ELECTRICAL SYSTEMTURN SIGNAL AND HAZARD WARNING SYSTEMBE±21

HAZARD WARNING SWITCH
INSPECTION
INSPECT SWITCH CONTINUITY
 
 Condition
 
 Tester connection to
terminal number
 
 Specified condition
 Switch OFF 7±10 Continuity 
 Switch ON
 
 7±8
4±5±6±9
 
 Continuity
 
 Illumination circuit
 
 2±3
 
 Continuity
If continuity is not as specified, replace the switch.
TURN SIGNAL FLASHER INSPECTION
INSPECT FLASHER OPERATION
(a) Connect the terminal 2 to battery positive (+) terminal and the
terminal 3 to battery negative (±) terminal.
(b) Connect the 2 turn signal light bulbs parallel to each other to
terminals 1 and 3, check that the bulbs flash.
HINT: The turn signal lights should flash between 60 and 120
times per minute. BE±22
± BODY ELECTRICAL SYSTEMTURN SIGNAL AND HAZARD WARNING SYSTEM

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

INTERIOR LIGHT SYSTEM
PARTS LOCATION
BE±26± BODY ELECTRICAL SYSTEMINTERIOR 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) 
 
 
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

LUGGAGE ROOM LIGHT INSPECTION
INSPECT ROOM LIGHT CONTINUITY
 
 Switch position
 
 
Tester connection to
terminal number 
 Specified condition
 OFF 1±2 No continuity 
 ON
 
 1±2
 
 Continuity
If continuity is not as specified, replace the light.
DOOR COURTESY SWITCH INSPECTION
INSPECT SWITCH CONTINUITY
 
 Switch position
 
 Tester connection to
terminal number 
 Specified condition
 
 ON
(Switch pin released) 
 1±2±3
 
 Continuity
 
 OFF
(Switch pin pushed in)
 
 ±
 
 No continuity
If continuity is not as specified, replace the switch
LUGGAGE ROOM LIGHT SWITCH
INSPECTION
INSPECT ROOM LIGHT CONTINUITY
 Condition Tester connection Specified condition
 
 ON
(Switch pin released) 
 1±Switch body 
 Continuity
 
 OFF
(Switch pin pushed in) 
 1±Switch body 
 No continuity
If continuity is not as specified, replace the switch. BE±28
± BODY ELECTRICAL SYSTEMINTERIOR LIGHT SYSTEM