Page 929 of 1807
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-641
869 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check operation of open door warning light.
CHECK:
Check that open door warning light comes on when each door is opened, and goes off when all doors are
closed.
NG Check and repair open door warning light
circuit.
OK
2 Check for open in harness and connector between theft deterrent and door lock
ECU and door courtesy switch (See page IN-28).
OK Check and replace theft deterrent ECU. *1
NG
Repair or replace harness or connector.
*
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 930 of 1807
I02556
Engine Hood Courtesy
SwitchTheft Deterrent and
Door Lock ECU
W-BGR
DSWH GR1412V
GR
EAIB6 IF3
2
14
9
T13
DI-642
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
870 Author: Date:
1997 SUPRA (RM502U)
Engine Hood Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The engine hood courtesy switch is built into the engine hood lock assembly and goes on when the engine
hood is opened and goes off when the engine hood is closed.
WIRING DIAGRAM
DI4XC-01
Page 931 of 1807
I02557
1
2
Disconnect
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-643
871 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check engine hood courtesy switch.
PREPARATION:
(a) Remove engine hood lock assembly.
(b) Disconnect engine hood courtesy switch connector.
CHECK:
Check continuity between terminals 1 and 2 when engine hood
lock is locked and unlocked.
OK:
Engine hood lockTerminal No. to continuity
Lock-
Unlock1 - 2
NG Replace engine hood courtesy switch.
OK
2 Check harness and connector between theft deterrent and door lock ECU and
switch, 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 (See page IN-28).
Page 932 of 1807
I02549
Luggage Compartment Door
Key Lock and Unlock SwichTheft Deterrent and Door Lock ECU
LUG
IE1
W-B
BJ
1L4
L
912V T13
2
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-633
861 Author: Date:
1997 SUPRA (RM502U)
Luggage Compartment Door Key Lock and Unlock Switch
Circuit
CIRCUIT DESCRIPTION
The luggage compartment door key lock and unlock switch goes on when the back door key cylinder is
turned to the unlock side with the key.
WIRING DIAGRAM
DI4X8-01
Page 933 of 1807

I02550
1 (+) ON
Connect
I02551
Disconnect
1 2
DI-634
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
862 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check voltage between terminal 1 of luggage compartment door key lock and
unlock switch connector and body ground.
PREPARATION:
(a) Remove deck trim rear cover.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal 1 of luggage compartment
door key lock and unlock switch connector and body ground,
when the key is turned to the unlock side and not turned.
OK:
Key operationVoltage
Turned to the unlock side0 V
Not turnedBattery positive voltage
OK Check and replace theft deterrent and door lock
ECU. *1
NG
2 Check luggage compartment door key lock and unlock switch.
PREPARATION:
Disconnect luggage compartment door key lock and unlock
switch connector.
CHECK:
Check continuity between terminals 1 and 2, when the key is
turned to the unlock side and not turned.
OK:
Key positionTerminal No. to continuity
Turned to unlock side1 - 2
Not turned-
NG Repair or replace luggage compartment door
key lock and unlock switch.
OK
Page 934 of 1807
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-635
863 Author: Date:
1997 SUPRA (RM502U)
3 Check harness and connector between theft deterrent and door lock ECU and
key unlock switch, key unlock 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: 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 935 of 1807
I02558I02558
Theft Deterrent and
Door Lock ECU
BatteryR/B No.2
J/B No.1
DOME
R +B1
W-B E
41 R 5 1
2
B2A
1B1E11
IH
T13
T7
DI-644
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
872 Author: Date:
1997 SUPRA (RM502U)
ECU Power Source-Circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the theft deterrent and door lock ECU.
WIRING DIAGRAM
DI4XD-01
Page 936 of 1807
N09001
Relay Block No.2
DOME Fuse
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-645
873 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check DOME fuse.
PREPARATION:
Remove DOME fuse from R/B No.2.
CHECK:
Check continuity of DOME fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the DOME fuse
(See attached wiring diagram).
OK