warning light TOYOTA SUPRA 1995 Service User Guide
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 1995, Model line: SUPRA, Model: TOYOTA SUPRA 1995Pages: 2543, PDF Size: 53.25 MB
Page 653 of 2543
LOW OIL PRESSURE WARNING
INSPECTION
1. INSPECT SWITCH
(a) Check that there is continuity between terminal and ground
with the engine stopped.
(b) Check that there is no continuity between terminal and
ground with the engine running.
HINT: Oil pressure should be over 29 kPa (0.3 kgf/ cm
2, 4.3
psi)
If operation is not as specified, replace the switch.
2. INSPECT WARNING LIGHT
(a) Disconnect the connector from the warning switch and
ground terminal on the wire harness side connector.
(b) Turn the ignition switch ON, check that the warning light lights
up.
If the warning light does not light up, test the bulb or inspect
wire harness.
ENGINE OIL LEVEL WARNING
INSPECTION
1. INSPECT SWITCH
(a) Check that there is continuity between terminal with the
switch in each position.
(b) Heat the switch to above 60°C (140°F) in an oil bath.
(c) Check that there is continuity between terminals with the
switch ON (float up).
(d) Check that there is no continuity between terminals with the
switch OFF (float down).
If operation is not as specified, replace the switch.
2. INSPECT WARNING LIGHT
(a) Disconnect the connector from the switch.
(b) Ground terminal 1 on the wire harness connector.
(c) Turn the ignition switch ON. Check that the warning light
lights up approximately 40 seconds later.
If the warning light does not light up, inspect bulb or wire har-
ness.
± BODY ELECTRICAL SYSTEMCOMBINATION METERBE±51
Page 654 of 2543
BRAKE FLUID LEVEL WARNING
INSPECTION
1. INSPECT SWITCH
(a) Remove the reservoir tank cap and strainer.
(b) Disconnect the connector.
(c) Check that there is no continuity between terminals with the
switch OFF (float up).
(d) Use syphon, etc. to take fluid out of the reservoir tank.
(e) Check that there is continuity between terminals with the
switch ON (float down).
(f) Pour the fluid back in the reservoir tank.
If operation is not as specified, replace the switch.
2. INSPECT WARNING LIGHT
(a) Disconnect the connector from the brake fluid warning
switch.
(b) Release the parking brake pedal.
(c) Connect terminals on the wire harness side of the level
warning switch connector.
(d) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or wire har-
ness.
PARKING BRAKE WARNING
INSPECTION
1. INSPECT SWITCH
(a) Check that there is continuity between terminal and switch
body with the switch ON (switch pin released).
(b) Check that there is no continuity between terminal and switch
body with the switch OFF (switch pin pushed in).
If operation is not as specified, replace the switch or inspect
ground point.
2. INSPECT WARNING LIGHT
(a) Disconnect the connector from the parking brake switch and
the brake fluid warning switch.
(b) Ground terminal on the wire harness side connector.
(c) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or inspect
wire harness. BE±52
± BODY ELECTRICAL SYSTEMCOMBINATION METER
Page 655 of 2543
LIGHT FAILURE SENSOR INSPECTION
1. INSPECT SENSOR CIRCUIT
Disconnect the connector from the sensor and inspect the
connector on the wire harness side, as shown.
Tester connection to
terminal number
Condition
Specified condition
1±Ground Constant Continuity*
2±Ground Constant Continuity*
9±Ground Constant Continuity*
10±Ground
Constant
Continuity*
11±Ground Constant Continuity
12±Ground Constant Continuity*
3±Ground Light control switch position OFF No Voltage 3±Ground Light control switch position TAIL or HEAD Battery positive voltage
4±Ground
Ignition switch position LOCK or ACC
No voltage
4±Ground Ignition switch position ON Battery positive voltage
7±Ground Stop light switch position OFF No voltage
7±Ground Stop light switch position ON Battery positive voltage
8±Ground
Engine condition Stop
No voltage
8±Ground Engine condition Running Battery positive voltage
*: There is resistance because this circuit is grounded
through the bulb.
If circuit is as specified, replace the sensor.
If the circuit is not as specified, inspect the circuits connected
to other parts.
2. INSPECT WARNING LIGHT
(a) Disconnect the connector from the light failure sensor and
ground terminal 4 on the wire harness side connector.
(b) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or inspect
wire harness.
± BODY ELECTRICAL SYSTEMCOMBINATION METERBE±53
Page 656 of 2543
OPEN DOOR WARNING INSPECTION
1. INSPECT DOOR COURTESY SWITCH
Switch Position
Tester connection to
terminal number
Specified condition
ON
(Switch pin released)
1±2
2±3
Continuity
OFF
(Switch pin pushed in)
±
No continuity
If continuity is not as specified, replace the switch.
2. INSPECT WARNING LIGHT
Disconnect the connector from the door courtesy switch, and
ground terminal 1 on the wire harness side connector and
check that the warning light lights up.
If the warning light does not light up, inspect the bulb or wire
harness.
LIGHT CONTROL RHEOSTAT
INSPECTION
INSPECT LIGHT CONTROL RHEOSTAT
(a) Connect the positive (+) lead from the battery to terminal 1
and negative lead (±) to terminal 3.
(b) Connect the positive (+) lead from the voltmeter to terminal
2 and negative lead to terminal 3.
(c) Turn the rheostat knob and check that the voltage changes. BE±54
± BODY ELECTRICAL SYSTEMCOMBINATION METER
Page 657 of 2543
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
Page 725 of 2543
MATRIX CHART OF PROBLEM SYMPTOMS
Proceed to the reference page shown in the matrix chart below for each malfunction symptom and troubleshoot
for each circuit.
HINT: Troubleshooting of the theft deterrent system is based on the premise that the door lock control system
is operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that the
door lock control system is operating normally.
Theft Deterrent System
Details of Problem Inspecting Circuit *1 See Page
1. Indicator light circuit BE±128
Th th ft d t t t t b t
2. Luggage compartment door key
lock and unlock switch circuit
BE±142
The theft deterrent system cannot be set 3. Luggage Room Light switch circuit BE±144
4. Door courtesy switch circuit
BE±147
5. Engine hood courtesy switch circuit BE±148
The indicator light does not blink when system is set Indicator light circuit BE±128
When the
system is
When the back door is
opened by a method other
than the key.
The system
does not
Luggage compartment door courtesy
switch circuit
BE±144
system is
set
When the engine hood is
opened
does not
Operate
Engine hood courtesy switch circuit
BE±148
Horns do not sound
Horn relay circuit
BE±132
While the system
ii i
Theft deterrent horn does not
sound
Theft deterrent horn circuit
BE±134
is in warning
operation Headlights do not flash Headlight control relay circuit BE±136
o eration Taillights do not flash Taillight control relay circuit BE±138
The starter cut is not cut off Starter relay circuit BE±130
When the
System is
It is not cancelled when the
ignition key is Turned to ACC
or ON position
Ignition switch circuit
BE±140
System is
Set
It still operates when the back
door is Opened with the key
Luggage compartment door key lock
and unlock switch circuit
BE±142
System is still set even when a rear door is open Door courtesy switch circuit BE±147
Horns sound Horn relay circuit BE±132
Even when the Theft deterrent horn sounds Theft deterrent horn circuit BE±134
Even when the
System is not set
Headlights stay on
Headlight control relay circuit
BE±136
Taillights stay on
Taillight control relay circuit
BE±138
*1
: If numbers are given to the circuit proceed with troubleshooting in the order indicated by those numbers.
± BODY ELECTRICAL SYSTEMBE±123THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 727 of 2543
TERMINALS OF ECU
No. Symbol Terminal Name No. Symbol Terminal Name
T8±1 +B2 Power Source T9±1 +B1 Power Source
T8±2 ACT± Door Lock Motor T9±2 ± ±
T8±3
ACT+
Door Lock Motor
T9±3
±
±
T8±4 E Ground
T9 4
DSWL
Luggage Compartment Door Courtesy
T8±5 ± ± T9±4 DSWL
Luggage Com artment Door Courtesy
Switch
T8±6 RLY Power Main Relay T9±5 L1 Door Lock Control Switch (Lock)
T8±7
IG
Ignition Switch ºONº
T9±6
UL3
Door Key Lock and Unlock Switch
T8±8 ACC Ignition Switch ºACCº T9±7 DSWD Door Open Detection Switch
T8±9 ± ± T9±8 UL1 Door Lock Control Switch (Unlock)
T9 9
LUG
Luggage Compartment Door Key Lock T9±9 LUG Luggage Com artment Door Key Lock
and Unlock Switch
T9±10 HEAD Headlight Control Relay
T9±11
SH
Theft Deterrent Horn
T9±12 IND Security Indicator Light
T9±13 ± ±
T9±14 FOD Engine Hood Courtesy Switch
LSWD
Door Unlock Detection Switch or Door T9±15 LSWD,
UL2 Door Unlock Detection Switch or Door
K L k d U l k S it h
T9±15
UL2Key Lock and Unlock Switch
T9±16
±
±
T9±17 ± ±
T9±18 ± ±
T9±19 DSWP Door Open Detection Switch
T9±20
KSW
Key Unlock Warning Switch
T9±21 LSWP Door Unlock Detection Switch
T9±22 L2 Door Key Lock and Unlock Switch
T9±23 TAIL Taillight Control Relay
T9±24
HORN
HORN Relay
T9±25 SRLY Ignition Switch ºSTº
± BODY ELECTRICAL SYSTEMBE±125THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 729 of 2543
Terminals Symbols Condition Standard Value
T9±12±Ground
(IND±Ground)
W±L±Ground
Always
Below 270
T9±14±T8±4
VR WB
Engine hood courtesy switch ON (hood opened). Below 1
T9 14 T8 4
(FOD±E)
VR±WB
Engine hood courtesy switch OFF (hood closed).
1 M or higher
T9±15±T8±4 LW W B Door unlock detection switch ON (door opened). Below 1
T9 15 T8 4
(LSWD±E) LW±WB Door unlock detection switch OFF (door closed). 1 M or higher
T9 15 T8 4
Door key lock and unlock switch ºunlockº position Below 1
T9±15±T8±4
(UL2±E)
W±WB
Door key lock and unlock switch OFF or ºlockº
position
1 M or higher
Door open detection switch (passenger's) ON
Below 1
T9±19±T8±4
RL WB
Door oen detection switch ( assenger s) ON
(door opened).
Below 1
T9 19 T8 4
(DSWP±E)
RL±WB
Door open detection switch (passenger's) OFF 1Mor higher
Door oen detection switch ( assenger s) OFF
(door closed).
1 M or higher
T9±20±T8±4
YWB
Key unlock warning switch ON. Below 1
T9 20 T8 4
(KSW±E) Y±WB Key unlock warning switch OFF. 1 M or higher
T9±21±T8±4
GB WB
Door unlock detection switch ON (door opened). Below 1
T9 21 T8 4
(LSWP±E)
GB±WB
Door unlock detection switch OFF (door closed).
1 M or higher
T9 22 T8 4
Door key lock and unlock switch ºlockº position. Below 1
T9±22±T8±4
(L2±E)
GY±WB
Door key lock and unlock switch OFF or ºunlockº
position.
1 M or higher
T9±23±T8±4
(TAIL±E)
GW±WB
Light control switch ºTAILº position.
10±14 V
T9±24±T8±4
(HORN±E)
LR±WB
Horn switch OFF.
10±14 V
T9±25±Ground
(SRLY±Ground)
L±O±Ground
Ignition switch is turned to ºSTº position.
(When park / neutral position switch ºPº position)
10±14 V
± BODY ELECTRICAL SYSTEMBE±127THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 749 of 2543
Door Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The door courtesy switch goes on when the door is opened and goes off when the door is closed.
INSPECTION PROCEDURE
(See page BE±123).
Check and repair open door warning light circuit
Check and replace theft deterrent ECU. *1.
Check operation of open door warning light.
Check that open door warning light comes on when each door is opened, and goes off when all
doors are closed.
*1: When there is a malfunction that the theft
deterrent system cannot be set, proceed to
the next numbered circuit inspection shown
on matrix chart (See page BE±123).
Check for open in harness and connector between theft deterrent and door
lock ECU and door courtesy switch (See page
IN±30).
Repair or replace harness or connector.
± BODY ELECTRICAL SYSTEMBE±147THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 792 of 2543
(See page BE±42).
BE±169.
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
(1) See input signal check on page BE±169.
(2) Check the indicator light when the parking brake
lever is pulled up.
Check operation of brake warning light.
Check voltage between terminal PKB of cruise control ECU connector and
body ground.
(1) Turn ignition switch ON.
(2) Measure voltage between terminal PKB of cruise
control ECU connector and body ground, when
the parking brake lever is pulled up and released.
Remove cruise control ECU with connectors still con-
nected.
Input signal check.
The indicator light goes off when the parking brake lever
is pulled up.
Check that the brake warning light in the instrument panel comes on when the parking brake lever is
pulled up with the engine running, and the light goes off when the parking brake lever is released.
Check brake warning light circuit
Parking brake lever
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
Voltage
Pulled up
Released
Check for open in harness and connector between cruise control ECU and
brake warning light.
Repair or replace harness or connector.
Check and replace cruise control ECU. BE±190
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM