TOYOTA SUPRA 1995 Service Repair Manual
Page 721 of 2543
P. BE±120
P. BE±123
P. IN±24
P. BE±128
Vehicle Brought to Workshop
Customer Problem Analysis
Problem Symptom ConfirmationSymptom Simulation
Problem does
not occur
Matrix Chart of Problem Symptoms
Circuit Inspection
Identification of Problem
Repair
Confirmation Test
EndDiagnostic steps permitting the use of the
TOYOTA hand±held tester or TOYOTA
brake±out±box.
Problem
occursTitles inside are titles of pages in this manual,
with the page number indicated in the bottom por-
tion. See the indicated pages for detailed explana-
tion.
HOW TO PROCEED WITH TROUBLESHOOTING
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.
For troubleshooting using a volt/ohm meter, see page BE±119.
Be sure to use troubleshooting procedure appropriate to the diagnostic tool being used.
Perform troubleshooting in accordance with the procedure on the following page.
± BODY ELECTRICAL SYSTEMBE±119THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 722 of 2543
CUSTOMER PROBLEM ANALYSIS CHECK SHEET
THEFT DETERRENT System Check Sheet
Inspector 's
Name:
Registration No.
Customer 's Name Registration Year //
Frame No.
Date Vehicle
Brought In // Odometer Reading km
Miles
Date Problem First Occurred
//
Frequency of Problem Occurs
Constant Sometimes ( times per day, month)
Once Only
Weather Conditions
When Problem
Weather
Fine Cloudy Rainy Snowy
Various/Others
When Problem
Occurred
Outdoor Temperature
Hot Warm Cool
Cold (Approx.5F (5C))
BE±120± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 723 of 2543
SYSTEM INSPECTION
1. SETTING OF THE THEFT DETERRENT SYSTEM
Setting Conditions
(a) Close all the doors.
(b) Close the engine hood and luggage compartment door.
(c) Remove the ignition key from the ignition key cylinder.
Setting Operation
When any of the following operations (a) or (c) is done, the theft deterrent indicator light will light up as de-
scribed.
(a) Lock the left or right front door using the key.
(All doors are locked by key±interlinked lock operation)
(b) With the rear doors locked and with one of the front doors locked, lock the other front door without
using the key (keyless door lock).
Elapsed time after operation
Indicator light
Within about 30 seconds Lights up
After about 30 seconds Blinks *1
*1: 1 sec. on, 1 sec. off
HINT: When the theft deterrent system is set, doors cannot be locked or unlocked with the door lock control
switch and the luggage compartment door cannot be unlocked with the luggage compartment door opener
switch.
2. CANCELLING OF THE THEFT DETERRENT SYSTEM IN THE SET CONDITION
Check if the theft deterrent indicator light is blinking.
Cancelling Operation
When any of the following operation (a), (b), (c) or (d) is done, the theft deterrent system is cancelled and
indicator light will go off.
(a) Unlock the left or right front door using the key.
(b) Insert the ignition key in the ignition key cylinder and turn it to the ACC or ON position.
(This is operative only when the theft deterrent system has never operated.)
(c) Unlock the luggage compartment door with the key. *
1
*1: The theft deterrent system is temporarily cancelled only while the luggage compartment door is
open. Approximately 2 seconds after the luggage compartment door is closed, the theft deterrent
system is reset.
± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEMBE±121
Page 724 of 2543
3. CHECK OF THE THEFT DETERRENT SYSTEM OPERATION.
Check if the theft deterrent indicator light is blinking.
When any of the following operations (a) or (b) is done, the system sounds the horns and theft deterrent
horn and flashes the headlights and taillights for about one minute to alert. At the same time, the system
disconnects the starter motor circuit and locks all doors (if all doors are not locked, the system repeats door
locking operation every 2 seconds during the one minute alert time).
(a) Open the engine hood using the engine hood opener lever.
(b) Unlock any of the front or rear doors without key operation.
4. CANCELLING OF THE THEFT DETERRENT SYSTEM IN OPERATING CONDITION.
The theft deterrent operation can be cancelled when any of the following conditions is met:
No. Condition Cancelling Operation
1
Unlock left or right door with the key.
2 Unlock doors with wireless door lock control system.
3 Insert key into ignition key cylinder and turn it to ACC or ON position. *2
4 About 1 minute passes after theft deterrent operation begins. Automatic stop *1
*1: In this case, the theft deterrent system resets in about 2 seconds after if all doors are closed.
*
2: The alarm will be off, but the engine will not operate. To restart the engine, see No.1.
ECU TERMINAL VALUES MEASUREMENT
USING TOYOTA BREAK±OUT±BOX AND
TOYOTA HAND±HELD TESTER
1. Hook up the TOYOTA break±out box and TOYOTA handheld
tester to the vehicle.
2. Read the ECU input/output values by following the prompts
on the hand±held tester screen.
HINT: TOYOTA hand±held tester has a ºShapshotº func-
tion. This records the measured values and is effective in
the diagnosis of intermittent problems.
Please refer to the TOYOTA hand±held tester/TOYOTA
break±out±box operator's manual for further details. BE±122
± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
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 726 of 2543
Door Lock System
Trouble Suspect Area See Page
Whole function of the door lock control system
does not operate.
1. ECU Power Source Circuit
2. Actuator Power Source Circuit
3. Door Lock Motor Circuit
4. Theft Deterrent and Door Lock Control ECU
BE±150
BE±152
BE±154
BE±125
All doors or some doors are not locked and un-
locked with the door lock control switch and
Key lock and unlock switch.
1. Door Lock Control Switch Circuit
2. Door Key Lock and Unlock Switch Circuit
3. Door Lock Motor Circuit
4. Theft Deterrent and Door Lock Control ECU
BE±156
BE±158
BE±154
BE±125
Doors cannot be locked with the door lock con-
trol switch. (Doors lock and unlock normally
With the key lock and unlock switch.)
1. Door Lock Control Switch Circuit
2. Key Unlock Warning Switch Circuit
3. Door Courtesy Switch Circuit
4. Theft Deterrent and Door Lock Control ECU
BE±156
BE±160
BE±147
BE±125
Doors are not locked or unlocked with the door
key Lock and unlock switch. (Doors lock and un-
lock normally with the door lock control switch.)
1. Door Key Lock and Unlock Switch Circuit
2. Theft Deterrent and Door Lock Control ECU
BE±158
BE±125
Key confinement prevention function does not
Operate. (Doors lock and unlock normally with
The door key lock and unlock switch.)
1. Key Unlock Warning Switch Circuit
2. Door Unlock Detection Switch Circuit
3. Theft Deterrent and Door Lock Control ECU
BE±160
BE±145
BE±125
BE±124± BODY ELECTRICAL SYSTEM
THEFT 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 728 of 2543
STANDARD VALUE OF ECU TERMINAL
Terminals Symbols Condition Standard Value
T8±1±Ground
(+B2±Ground)
L±W±Ground
Always
10±14 V
T8±2±T8±3
(ACT±±ACT+)
LR±LY
Ignition Switch is turned to ºOFFº position.
Below 50
T8±6±T8
(RLY±PRLY)
R±L±Ground
Always
10±14 V
T8±7±Ground
(IG±Ground)
B±R±Ground
Ignition switch is turned to ºONº position.
10±14 V
T8±7±T8±4
(ACC±E)
LR±WB
Ignition switch is turned to ºACCº position.
10±14 V
T9±Ground
(+B1±Ground)
R±Ground
Always
10±14 V
T9±4±T8±4
LG WB
Luggage compartment door courtesy switch ON
(door opened).
Below 1
T94T84
(DSWL±E)
LG±WB
Luggage compartment door courtesy switch OFF
(door closed).
1 M or higher
T9±5±T8±4
RW WB
Door lock control switch ºlockº position. Below 1
T95T84
(L1±E)
RW±WB
Door lock control switch OFF or ºunlockº position.
1 M or higher
T9±6±T8±4 GWB Door key lock and unlock switch ºunlockº position. Below 1
T96T84
(UL3±E) G±WB Door key lock and unlock switch OFF or ºlockº position. 1 M or higher
T9±7±T8±4
RB WB
Door open detection switch (driver's) ON
(door opened).
Below 1
T97T84
(DSWD±E)
RB±WB
Door open detection switch (driver's) OFF
(door closed).
1 M or higher
T9±8±T8±4
GR WB
Door lock control switch ºunlockº position.
Below 1
T98T84
(UL1±E)
GR±WB
Door lock control switch OFF or ºlockº position 1 M or higher
T9±9±T8±4
LWB
Luggage compartment door key lock and unlock switch ON Below 1
T99T84
(LUG±E) L±WB Luggage compartment door key lock and unlock switch OFF 1 M or higher
T9±10±T8±4
(HEAD±E)
RY±WB
Light control switch other than ºHEADº position.
10±14 V
T9±11±T8±4
(SH±E)
WL±WB
Always
10±14 V
BE±126± BODY ELECTRICAL SYSTEMTHEFT 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 730 of 2543
CIRCUIT INSPECTION
Indicator Light Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is preparing to set, this circuit lights up the indicator light. When the system
has been set, it continually turns the indicator light on for 1 second and turns it off for 1 second, thus blink-
ing the indicator light.
BE±128± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM