1995 TOYOTA SUPRA door lock

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

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

 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 1M
or 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

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

INSPECTION PROCEDURE
(See page BE±123).
Check harness and connector between theft deterrent and door lock ECU
and indicator light, indicator light and body ground (See page IN±30).
(2) Remove instrument panel cluster finish panel.
(3) Disconnect telltale light RH connector.
Connect positive (+) lead to terminal 10 and neg-
ative (±) lead to terminal 9 of indicator light con-
nector.
Indicator light comes on.
Replace telltale light RH.
Repair or replace harness or connector.
Check and replace theft deterrent and door
lock ECU. *1*1: When there is a malfunction that the theft de-
terrent system cannot be set, proceed to the
next numbered circuit inspection shown on
matrix chart (See page BE±123).
Check indicator light
± BODY ELECTRICAL SYSTEMBE±129THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM

Starter Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact (a) in the ECU becomes open, creating an open circuit
in terminal ST circuit and making the starter inoperative (starter cut).
In this condition, if one of the following operations is done, the contact (a) in the ECU is grounded, thus can-
celling the starter cut:
(1) The front LH and RH door is unlocked with a key. BE±130
± BODY ELECTRICAL SYSTEM
THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM

INSPECTION PROCEDURE
HINT: This troubleshooting is based on the premise that engine cranking occurs.
If the engine does not crank, proceed to engine troubleshooting on page EG±381 or 487 (Vol. 1).
(See page IN±30).
(1)Remove instrument panel panel.
(See BO section.)
(2)Disconnect the ECU connector.
Measure voltage between terminal SRLY of theft
deterrent ECU connector and body ground when
ignition switch is turned on.
Voltage: 10 ± 14 V
Check and replace theft deterrent ECU.
Check voltage between terminal SRLY of theft deterrent and door lock
ECU connector and body ground.
Check and repair harness and connector between starter and theft deterrent and door lock ECU
± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEMBE±131

Horn Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off in approximately
0.2 sec. cycles. This switches the horn relay on and off, thus the horns blow (See the wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the horn relay switches
off, thus stopping the horns from blowing:
(1) The front LH or RH door is unlocked with a key.
(2) The ignition switch is turned to ACC or ON position.
(3) Approximately 1 minute elapses.
BE±132± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM