Page 921 of 1807
I02547
Theft Deterrent and
Door Lock ECU J/B No.1
Ignition Switch
R/B No.2
R/B No.2
Battery
AM1 ALT
4CIG
WT7
J/B No.1
W 4
4 232 8
58
7 17 1B
1J
2
2
2
12AW
B
ACC L-R
B-R P-L
B-Y
IG1E
1E 1J
1J
ECU-IG DI-630
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
858 Author: Date:
1997 SUPRA (RM502U)
Ignition Switch Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU. Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to the
terminals ACC and IG of the ECU. When the battery positive voltage is applied to the terminal ACC of the
ECU while the theft deterrent system is activated, the warning stops. Furthermore, power supplied from the
terminals ACC and IG of the ECU is used as power for the door courtesy switch, and position switch, etc.
WIRING DIAGRAM
DI4X7-01
Page 922 of 1807
N08843N14677I04612
ECU-IG
CIG Junciton Block No.1
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-631
859 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check CIG and ECU-IG fuses.
PREPARATION:
Remove CIG and ECU-IG fuses from J/B No.1.
CHECK:
Check continuity of CIG and ECU-IG fuses.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the CIG and ECU-IG fuses
(See attached wiring diagram).
OK
Page 923 of 1807
I02548
ON
Disconnect
IG (+)ACC (+)
DI-632
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
860 Author: Date:
1997 SUPRA (RM502U)
2 Check voltage between terminals IG and ACC of theft deterrent and door lock
ECU and body ground.
PREPARATION:
(a) Remove the instrument panel. (See page BO-50)
(b) Disconnect the ECU connector.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals IG and ACC of theft deter-
rent ECU connector and body ground.
OK:
Voltage: 10 - 14 V
OK Check and replace theft deterrent and door lock
ECU.
NG
Check and repair harness and connector between theft deterrent and door lock ECU and battery
(See page IN-28).
Page 924 of 1807
I02552
Luggage Compartment Door
Courtesy SwitchTheft Deterrent and
Door Lock ECU
8
LG
IE1DSWL
412V
1T13
LG DI-636
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
864 Author: Date:
1997 SUPRA (RM502U)
Luggage Compartment Door Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The luggage compartment door courtesy switch goes on when the back door is opened and goes off when
the back door is closed.
WIRING DIAGRAM
DI4X9-01
Page 925 of 1807
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-637
865 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check operation of luggage room light.
CHECK:
Check that luggage room light goes off when luggage room light switch is pushed, and comes on when switch
is not pushed.
NG Check and repair luggage compartment door
courtesy light circuit (See page DI-636).
OK
2 Check for open in harness and connector between theft deterrent and door lock
ECU and luggage compartment door courtesy switch (See page IN-28).
NG Repair or replace harness or connectors.
OK
Check and replace theft deterrent ECU. *
1
*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 DI-615).
Page 926 of 1807
I02553
Door Lock Motor and Unlock
Detection Switch RHTheft Deterrent and
Door Lock ECU
Door Lock Motor and Unlock
Detection Switch LH W-B W-BL-Y
LSWD
L-W L-W
W-B
IH
IE
IL1
IJIDIL1
ID18
21
1
16
15 110 1642
3
2
412V
12V T13
3 W-BG-B
G-BLSWP DI-638
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
866 Author: Date:
1997 SUPRA (RM502U)
Door Unlock Detection Switch Circuit
CIRCUIT DESCRIPTION
The door unlock detection switch goes off when the door lock knob is operated to the lock position, and
comes on when the door lock knob is operated to the unlock position.
WIRING DIAGRAM
DI4XA-01
Page 927 of 1807

I02554
Disconnect
1
3
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-639
867 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check door unlock detection switch.
PREPARATION:
(a) Remove the door trim.
(b) Disconnect door lock motor and door unlock detection
switch connector.
CHECK:
Check continuity between terminals 1 and 3 of door unlock
detection switch connector, when door lock knob is operated to
the lock side and to the unlock side.
OK:
Switch conditionTerminal No. to continuity
Door unlock1 - 3
Door lock-
NG Replace door unlock detection switch.
OK
2 Check harness and connector between theft deterrent and door lock ECU and
door unlock detection switch, door unlock detection switch and body ground
(See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace theft deterrent and door
lock ECU. *
1
*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 DI-615).
Page 928 of 1807
I02555
Door Courtesy Switch LH
Door Courtesy
Switch RHTheft Deterrent and
Door Lock ECU
W-BR-B R-B R-B DSWD
DSWP R-L R-L
W-B233
3
247 15
19 IC2 IF2
IF312V
12V T13
BI
IG
DI-640
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
868 Author: Date:
1997 SUPRA (RM502U)
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.
WIRING DIAGRAM
DI4XB-01