light TOYOTA T100 1996 Factory Service Manual

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− BODY ELECTRICALBODY ELECTRICAL SYSTEM
BE−1
1801 Author: Date:
1996 TOYOTA T100 (RM449U)
BODY ELECTRICAL SYSTEM
PRECAUTION
Take care to observe the following precautions when performing inspections or removal and replacement
of body electrical related parts.
1. LIGHTING SYSTEM
Halogen bulbs have pressurized gas inside and require special handling.
They can burst or scatter if scratched or dropped. Hold a bulb only by its plastic or metal case.
Don’t touch the glass part of a bulb with bare hands.
2. SRS (SUPPLEMENTAL RESTRAINT SYSTEM)
The TOYOTA T100 is equipped with an SRS (Supplemental Restraint System) such as the driver airbag.
Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy
during servicing, possibly leading to a serious accident. Before servicing (including removal or installation
of parts, inspection or replacement), be sure to read the precautionary notices in the RS section.
3. AUDIO SYSTEM
If the battery negative (−) terminal is disconnected, the preset AM, FM 1 and FM 2 stations stored in
memory are erased, so be sure to note the stations and reset them after the battery terminal is recon-
nected.
If the battery negative (−) terminal is disconnected, the ”ANTI−THEFT SYSTEM” will operate when the
terminal is reconnected, but the radio, tape player and CD player will not operate. Be sure to input the
correct ID number so that the radio, tape player and CD player can be operated again.
4. MOBILE COMMUNICATION SYSTEM
If the vehicle is equipped with a mobile communication system, refer to precautions in the IN section.

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BE−2
− BODY ELECTRICALBODY ELECTRICAL SYSTEM
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
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 re-
place the part when it is found to be faulty.
USA:
HEADLIGHT AND TAILLIGHT SYSTEM
SymptomSuspect AreaSee page
Headlight does not light up
(Taillight is normal)
1. HEAD Fuse (Relay Block)
2. Light Control Switch
3. Headlight Dimmer Switch
4. Headlight BulbBE−14
BE−17
BE−17
BE−17
Headlight does not light up
(Taillight does not light up)
1. Light Control Switch
2. Headlight Dimmer Switch
3. Wire Harness
4. Headlight BulbBE−17
BE−17
−
−
Only one light comes on
1. HEAD Fuse (Relay Block)
2. Wire Harness
3. Headlight BulbBE−14
−
−
”Lo−Beam” does not light up
1. Headlight Control Relay
2. Headlight Dimmer Relay
3. Headlight Dimmer Switch
4. Wire Harness
5. Headlight BulbBE−17
BE−17
BE−17
−
−
”Hi−Beam” does not light up
1. Headlight Control Relay
2. Headlight Dimmer Relay
3. Headlight Dimmer Switch
4. Wire Harness
5. Headlight BulbBE−17
BE−17
BE−17
−
−
”Flash” does not light up
1. Headlight Control Relay
2. Headlight Dimmer Relay
3. Headlight Dimmer Switch
4. Wire Harness
5. Headlight BulbBE−17
BE−17
BE−17
−
−
Taillight does not light up
(Headlight does not light up)
1. TAIL Fuse (Junction Block No.1)
2. Light Control Switch
3. Wire Harness
4. Headlight BulbBE−17
BE−17
−
−
Taillight does not light up
(Headlight is normal)
1. TAIL Fuse (Junction Block No.1)
2. Light Control Switch
3. Taillight Control Relay
4. Wire Harness
5. Taillight BulbBE−14
BE−17
BE−17
−
−
Only one light goes out or does not light up1. Wire Harness
2. Taillight Bulb−
−
Rear Combination light does not light up
1. TAIL Fuse (Junction Block No.1)
2. Wire Harness
3. Taillight BulbBE−14
−
−
”Light−on warning system” does not operate.
1. Integration Relay
2. DOME Fuse (Relay Block)
3. GAUGE Fuse (Junction Block No.1)
4. Door Courtesy Switch
5. Wire HarnessBE−17
BE−14
BE−14
BE−25
−

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1996 TOYOTA T100 (RM449U)
CANADA:
HEADLIGHT AND TAILLIGHT SYSTEM
SymptomSuspect AreaSee page
Only one side headlight does not light up.1. Headlight Bulb
2. Wire Harness−
−
”Lo−Beam” does not light up. (ALL)
1. D.R.L. Relay
2. Headlight Dimmer Relay
3. Headlight Control Relay
4. Headlight Dimmer Switch
5. Wire HarnessBE−14
BE−17
BE−17
BE−17
−
”Lo−Beam” does not light up. (ONE SIDE)
1. HEAD LH−Lo Fuse (Relay Block)
2. HEAD RH−Lo Fuse (Relay Block)
3. Headlight Bulb
4. Wire HarnessBE−14
BE−14
−
−
”Hi−Beam” does not light up. (ALL)
1. DRL Fuse (Junction Block No.1)
2. Headlight Dimmer Relay
3. Headlight Control Relay
4. Headlight Dimmer Switch
5. Wire HarnessBE−14
BE−17
BE−17
BE−17
−
”Hi−Beam” does not light up. (ONE SIDE)
1. HEAD LH−Hi Fuse (Relay Block)
2. HEAD RH−Hi Fuse (Relay Block)
3. Headlight Bulb
4. Wire HarnessBE−14
BE−14
−
−
”Flash” does not light up.1. Headlight Dimmer Switch
2. Wire HarnessBE−17
−
Headlight does not light up.
(Taillight is normal)
1. Headlight Control Relay
2. D.R.L. Relay
3. D.R.L. No.4 Relay
4. D.R.L. Resistor
5. Headlight Dimmer Switch
6. Light Control Switch
7. Headlight Bulb
8. Wire HarnessBE−17
BE−17
BE−17
BE−17
BE−17
BE−17
−
−
Headlight does not light up.
(Taillight does not light up)
1. Headlight Control Relay
2. D.R.L. Relay
3. D.R.L. No.4 Relay
4. D.R.L. Resistor
5. Headlight Dimmer Switch
6. Light Control Switch
7. Headlight Bulb
8. Wire HarnessBE−17
BE−17
BE−17
BE−17
BE−17
BE−17
−
−
Only one side taillight does not light up.1. Taillight Bulb
2. Wire Harness−
−
Taillight does not light up.
(Headlight is normal)
1. TAIL Fuse (Junction Block No.1)
2. Taillight Control Relay
3. Light Control Switch
4. Taillight Bulb
5. Wire HarnessBE−14
BE−17
BE−17
−
−
Taillight does not light up.
(Headlight does not light up)1. Light Control Switch
2. Taillight Bulb
3. Wire HarnessBE−17
−
−
Headlight does not light up with light control SW in HEAD.
1. Light Control Switch
2. D.R.L. Relay
3. D.R.L. No.4 Relay
4. Wire HarnessBE−17
BE−17
BE−17
−

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− BODY ELECTRICALBODY ELECTRICAL SYSTEM
1996 TOYOTA T100 (RM449U) Headlight does not go out with light control SW in OFF.
1. Headlight Control Relay
2. Light Control Switch
3. Wire HarnessBE−17
BE−17
−
Taillight does not light up with light control SW in TAIL.
1. Taillight Control Relay
2. Light Control Switch
3. Wire HarnessBE−17
BE−17
−
Taillight does not go out with light control SW in OFF.
1. Taillight Control Relay
2. Light Control Switch
3. Wire HarnessBE−17
BE−17
−
Headlight do not light up with engine running, parking brake SW
and light control SW in OFF.
1. ECU−B Fuse (Junction Block No.1)
2. GAUGE Fuse (Junction Block No.1)
3. DRL Fuse (Junction Block No.1)
4. D.R.L. Relay
5. D.R.L. No.4 Relay
6. D.R.L. Resistor
7. Wire Harness
8. Generator L Terminal
9. Parking Brake SwitchBE−14
BE−14
BE−14
BE−17
BE−17
BE−17
−
−
BE−38
”Light−on warning system” does not operate.
1. Integration Relay
2. DOME Fuse (Relay Block)
3. GAUGE Fuse (Junction Block No.1)
4. Door Courtesy Switch
5. Wire HarnessBE−17
BE−14
BE−14
BE−25
−
TURN SIGNAL AND HAZARD WARNING SYSTEM
SymptomSuspect AreaSee page
”Hazard” and ”Turn” do not light up
1. Hazard Warning Switch
2. Turn Signal Flasher
3. Wire HarnessBE−23
BE−23
−
The flashing frequency is abnormal
1. Bulb
2. Turn Signal Switch
3. Wire Harness−
BE−23
−
Hazard warning light does not light up
(Turn signal is normal)1. HAZ−HORN Fuse (Relay Block)
2. Wire HarnessBE−22
−
Hazard warning light does not light up in one direction1. Hazard Warning Switch
2. Wire HarnessBE−23
−
*1 Turn signal does not light up
1. Ignition Switch
2. TURN Fuse (Junction Block No.1)
3. Turn Signal Switch
4. Wire HarnessBE−12
BE−22
BE−23
−
*2 Turn signal does not light up
1. TURN Fuse (Junction Block No.1)
2. Turn Signal Switch
3. Wire HarnessBE−22
BE−23
−
Turn signal does not light up in one direction1. Turn Signal Switch
2. Wire HarnessBE−23
−
Only one bulb does not light up1. Bulb
2. Wire Harness−
−
*1: Combination Meter, Wiper and Washer do not operate.
*
2: Combination Meter, Wiper and Washer are normal.

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1996 TOYOTA T100 (RM449U)
INTERIOR LIGHT SYSTEM
SymptomSuspect AreaSee page
Room light does not light up
1. DOME Fuse (Relay Block)
2. Room Light Switch
3. Door Courtesy Switch
4. Wire Harness
5. BulbBE−24
BE−25
BE−25
−
−
Room light remains always on
1. Room Light Switch
2. Door Courtesy Switch
3. Wire HarnessBE−25
BE−25
−
BACK−UP LIGHT SYSTEM
SymptomSuspect AreaSee page
Back−Up Light does not light up
1. GAUGE Fuse (Junction Block No.1)
2. Ignition Switch
3. Back−Up Light Relay (Column A/T)
4. Back−Up Light Switch (M/T)
5. PNP Switch (A/T)
6. Bulb
7. Wire HarnessBE−26
BE−12
BE−28
BE−28
DI−306
−
−
Back−Up Light remains always on1.Wire Harness−
Only one light does not light up1. Bulb
2. Wire Harness−
−
STOP LIGHT SYSTEM
SymptomSuspect AreaSee page
Stop light does not light up
1. STOP Fuse (Junction Block No.1)
2. Stop Light Switch
3. Wire Harness
4. BulbBE−29
BE−30
−
−
Stop light remains always on1. Stop Light Switch
2. Wire HarnessBE−30
−
Only one light does not light up1. Wire Harness
2. Bulb−
−
WIPER AND WASHER SYSTEM
SymptomSuspect AreaSee page
Wiper does not operate or turn to off position
1. WIPER Fuse (Junction Block No.1)
2. Ignition Switch
3. Wiper and Washer Switch
4. Wiper Motor
5. Wire HarnessBE−31
BE−12
BE−32
BE−32
−
Wiper does not operate in INT position
1. Wiper and Washer Switch
2. Wiper Motor
3. Wire HarnessBE−32
BE−32
−
Washer does not operate
1. Wiper and Washer Switch
2. Washer Hose and Nozzle
3. Washer Motor
4. Wire HarnessBE−32
−
BE−32
−

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− BODY ELECTRICALBODY ELECTRICAL SYSTEM
1996 TOYOTA T100 (RM449U)
COMBINATION METER
Meter, Gauge and Illumination:
SymptomSuspect AreaSee page
Tachometer, fuel gauge oil Pressure and water temperature
gauge do not operate
1. GAUGE Fuse (Junction Block No.1)
2. Combination Meter Wiring Circuit
3. Wire Harness
4. Meter Circuit Plate−
BE−36
−
BE−36
Speedometer does not operate1. Vehicle Speed Sensor
2. Speedometer Driven Gear and Drive GearBE−38
−
Tachometer does not operate
1. Combination Meter Wiring Circuit
2. Wire Harness
3. Igniter
4. Meter Circuit PlateBE−36
−
−
−
BE−36
Fuel gauge does not operate or abnormal operation
1. Fuel Receiver Gauge
2. Fuel Sender Gauge
3. Combination Meter Wiring Circuit
4. Wire HarnessBE−38
BE−38
BE−36
−
Engine coolant temperature gauge does not operate
or abnormal operation
1. Engine Coolant Temperature Receiver Gauge
2. Engine Coolant Temperature Sender Gauge
3. Combination Meter Wiring Circuit
4. Wire HarnessBE−38
BE−38
BE−36
−
Oil pressure gauge does not operte or abnormal operation
1. Oil Pressure Receiver Gauge
2. Oil Pressure Sender Gauge
3. Combination Meter Wiring Circuit
4. Wire HarnessBE−38
BE−38
BE−36
−
All illumination lights do not light up
1. TAIL Fuse (Junction Block No.1)
2. Light Control Rheostat
3. Wire Harness−
BE−38
−
Brightness does not change even when rheostat turned1. Bulb
2. Wire Harness−
−
Only one illumination light does not light up1. Bulb
2. Wire Harness−
−
COMBINATION METER
Warning Lights:
SymptomSuspect AreaSee page
Warning light do not light up (Except Discharge)
1. GAUGE Fuse (Junction Block No.1)
2. Combination Meter Wiring Circuit
3. Wire Harness−
BE−36
−
Oil pressure warning light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. Oil Pressure Warning Switch
4. Wire Harness−
BE−36
BE−38
−
Washer Fluid Level Warning light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. Washer Fluid Level Warning Switch
4. Wire Harness−
BE−36
BE−38
−
Fuel level warning light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. Fuel Level Warning Switch
4. Wire Harness−
BE−36
BE−38
−

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1996 TOYOTA T100 (RM449U) A/T Oil temperature warning indicator light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. A/T Oil Temperature Sensor
4. Wire Harness−
BE−36
BE−38
−
SRS warning light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. Center Airbag Sensor Assembly
4. Wire Harness−
BE−36
DI−372
−
Malfunction indicator does not light up
1. Bulb
2. ECM
3. Wire Harness−
−
−
−
Seat belt warning light does not light up
1. Bulb
2. Integration Relay
3. Wiring Harness−
−
−
Discharge warning light does not light up
1. IGN Fuse (Junction Block No.1)
2. Bulb
3. Wire Harness
4. Generator−
−
−
−
Brake warning light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. Parking Brake Switch
4. Brake Fluid Level Warning Switch−
BE−36
BE−38
BE−38
COMBINATION METER
Indicator Lights:
SymptomSuspect AreaSee page
O/D OFF indicator light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. O/D OFF Switch
4. Wire Harness−
BE−36
DI−311
−
High beam indicator light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. Wire Harness
4. Headlight System−
BE−36
−
BE−2
Turn indicator light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. Wire Harness
4. Turn Signal and Hazard Warning System−
BE−36
−
BE−2
Shift indicator lights do not light up (ALL)
1. Bulb
2. Combination Meter Wiring Circuit
3. PNP Switch
4. Wire Harness−
BE−36
DI−306
−
Shift indicator lights do not light up (L, 2, D)
1. Bulb
2. Combination Meter Wiring Circuit
3. PNP Switch
4. Light Control Rheostat
5. Wire Harness−
BE−36
DI−306
BE−38
−
Only one shift indicator does not light up1. Bulb
2. Combination Meter Wiring Circuit−
BE−36

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− BODY ELECTRICALBODY ELECTRICAL SYSTEM
1996 TOYOTA T100 (RM449U) ndicator lights do not light up (Except. Turn, Hi−beam)
1. GAUGE Fuse (Junction Block No1.)
2. Wire Harness−
−
ABS indicator light does not light up
1. Bulb
2. Combination Meter Wiring Circuit
3. ABS ECU
4. Wire Harness−
BE−36
DI−331
−
POWER WINDOW CONTROL SYSTEM
SymptomSuspect AreaSee page
*1Power window does not operate
1. POWER WINDOW Fuse (Junction Block No.1)
2. GAUGE Fuse (Junction Block No.1)
3. Door Lock Control Relay
4. Ignition Switch
5. Power Window Master Switch
6. Wire HarnessBE−46
BE−46
BE−47
BE−12
BE−47
−
*2Power window does not operate
1. POWER WINDOW Fuse (Junction Block No.1)
2. GAUGE Fuse (Junction Block No.1)
3. Ignition Switch
4. Door Lock Control Relay
5. Power Window Master Switch
6. Wire HarnessBE−46
BE−46
BE−12
BE−47
BE−47
−
”One Touch Power Window System” does not operate1. Power Window Master SwitchBE−47
Only one window glass does not move
1. Power Window Master Switch
2. Power Window Switch
3. Power Window Motor
4. Wire HarnessBE−47
BE−47
BE−47
−
”Window Lock System” does not operate1. Power Window Master SwitchBE−47
”Window Lock Illumination” does not operate1. Power Window Master SwitchBE−47
*1 Power door lock system does not operate
*
2 Power door lock system is normal

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N12608
Junction Block Side
− BODY ELECTRICALIGNITION SWITCH AND KEY UNLOCK WARNING
SWITCHBE−13
1996 TOYOTA T100 (RM449U)
(f) Connect the positive (+) lead from the battery to terminal
3.
(g) Disconnect the negative (−) lead from the battery to termi-
nal 10.
(h) Check that the buzzer stops sounding.
If operation is not as specified, replace the relay.
4. INSPECT INTEGRATION RELAY CIRCUIT
Remove the relay from the junction block No.1 and inspect the
connectors on the junction block side.
Tester connectionConditionSpecified condition
2 − GroundKey unlock warning switch OFFNo continuity
2 − GroundKey unlock warning switch ONContinuity
*4 − GroundConstantContinuity
6 − GroundBuckle switch OFFNo continuity
6 − GroundBuckle switch ONContinuity
7 − GroundConstantContinuity
10 − GroundDriver’s door courtesy switch OFFNo continuity
10 − GroundDriver’s door courtesy switch ONContinuity
12 − GroundPassenger’s door courtesy switch OFFNo continuity
12 − GroundPassenger’s door courtesy switch ONContinuity
1 − GroundIgnition switch LOCKNo voltage
1 − GroundIgnition switch ACC or ONBattery positive voltage
3 − GroundConstantBattery positive voltage
5 − GroundIgnition switch LOCK or ACCNo voltage
5 − GroundIgnition switch ONBattery positive voltage
8 − GroundIgnition switch LOCK or ACCNo voltage
8 − GroundIgnition switch ONBattery positive voltage
9 − GroundIgnition switch LOCK or ACCNo voltage
9 − GroundIgnition switch ONBattery positive voltage
11 − GroundLight control switch OFFNo voltage
11 − GroundLight control switch TAIL or HEADBattery positive voltage
*: SR5 Model
If circuit is as specified, trying replacing the relay with a new
one.
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

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Relay Block
 Headlight Control Relay
*2  Headlight Dimmer Relay
*1  HEAD (RH) Fuse
*2  HEAD (RH−Hi) Fuse
*2  HEAD (RH−Lo) Fuse
*1  HEAD (LH) Fuse
*2  HEAD (LH−Hi) Fuse
*2  HEAD (LH−Lo) Fuse
 DOME Fuse

*1 : USA Models Only
*2 : CANADA Models Only
D.R.L. Daytime Running Light
Headlight *2 D.R.L. Resister
Combination Switch
 Light Control Switch
 Headlight Dimmer SwitchIgnition Switch
D.R.L. Main
Relay
Door Courtesy
Switch
Rear Combination Light
Junction Block No.1
 Taillight Control Relay
*2  D.R.L. No.4 Relay
 Integration Relay
*2  D.R.L. No.4 Fuse
 GAUGE Fuse
 TAIL Fuse
 ECU−B Fuse
BE02Z−03
BE−14
− BODY ELECTRICALHEADLIGHT AND TAILLIGHT SYSTEM
1814 Author: Date:
1996 TOYOTA T100 (RM449U)
HEADLIGHT AND TAILLIGHT SYSTEM
LOCATION