TOYOTA SUPRA 1997 Service Repair Manual

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).

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

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

- 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).

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

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

I02559
LOCK
E (-)+B1 (+)
DI-646
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
874 Author
: Date
:
1997 SUPRA (RM502U)
2 Check voltage between terminals +B1 and E of ECU connector.
PREPARATION:
(a) Remove the No.1 under cover and heater duct.
(b) Disconnect the theft deterrent and door lock ECU con-
nectors.
CHECK:
Measure voltage between terminals +B1 and E of ECU connec-
tor.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-615).
NG
3 Check for open in harness and connector between ECU and body ground
(See page IN-28).
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween ECU and battery (See page IN-28).

I02560
J/B No.1 DOOR FuseTheft Deterrent and
Door Lock ECU
Door Lock MotorT7
12V L-W L-W
+B2
9 13
IF1 W-L
R/B No.2
R/B No.2
POWER ALT
B W
Battery
1B 1H2
15
2
2
2
2A
1
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-647
875 Author
: Date
:
1997 SUPRA (RM502U)
Actuator Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to drive the door lock motor.
WIRING DIAGRAM
DI4XE-01

N09001
Relay Block No.2
POWER M-Fuse
DI-648
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
876 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check POWER M-fuse.
PREPARATION:
Remove POWER M fuse from R/B No.2.
CHECK:
Check continuity of POWER M-fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the DOOR fusible link
(See attached wiring diagram). *
1
OK

I02561
LOCK
+B2 (+)
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-649
877 Author
: Date
:
1997 SUPRA (RM502U)
2 Check voltage between terminal +B2 of ECU connector and body ground.
PREPARATION:
(a) Remove the instrument panel. (See page BO-50)
(b) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal +B2 of ECU connector and
body ground.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-615).
NG
Check and repair harness and connector be-
tween ECU and battery (See page IN-28).
*1: The power source is supplied to the actuator (door lock motor, through the theft deterrent and door lock
ECU. Accordingly, if a short circuit of the W/H or actuator occurs in the actuator circuit the POWER M-Fuse
may become OPEN, so also inspect the actuator (door lock motor circuit on page DI-647).