TOYOTA SUPRA 1997 Service Repair Manual

I02562
Door Lock Motor RH
Door Lock Motor LHTheft Deterrent and
Door Lock ECU
L-Y
L-Y L-YL-Y L-R
L-R L-RL-R ACT
+
312V
12V
ACT
-
2 L-YT7
12
IL12
411
IL1
5
ID1 16
ID14
2 DI-650
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
878 Author
: Date
:
1997 SUPRA (RM502U)
Door Lock Motor Circuit
CIRCUIT DESCRIPTION
This door lock motor locks and unlocks the door according to signals from the ECU.
WIRING DIAGRAM
DI4XF-01

N08716
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-651
879 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check operating sound of door lock motor.
CHECK:
Check operating sound of door lock motor, when door lock con-
trol switch is pushed to the lock side and unlock side.
OK:
Can hear operating sound of door lock motor.
HINT:
Inspect the door which is malfunctioning.
OK Repair or replace door lock control link.
NG

N16142 N16142
N16142 N16142I04613
Driver's Side
Passenger's Side
2 (+)2 (-)
2 (-)
2 (+) Lock
Unlock
Passenger's Side Driver's Side
4 (-)4 (+)
4 (+)4 (-)
DI-652
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
880 Author
: Date
:
1997 SUPRA (RM502U)
2 Check door lock motor.
PREPARATION:
(a) Remove the door trim and service hole cover.
(b) Disconnect the door lock motor connector.
CHECK:
(a) Connect positive
lead to terminal 2 (4) and negative 
lead to terminal 4 (2) of door lock motor connector.
(b) Connect positive
lead to terminal 4 (2) and negative 
lead to terminal 2 (4) of door lock motor connector.
( ): Passenger's Side.
OK:
(1) Door lock motor locks door.
(2) Door lock motor unlocks door.
HINT:
This inspection must be carried out within 2 seconds.
OK Replace door lock motor.
NG
3 Check harness and connectors between ECU and door lock motor
(See page IN-28).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page DI-615).

I02563
Door Lock Control Switch LH
(Power Window Master Switch)Theft Deterrent and
Door Lock ECU
Door Lock Control Switch RHT13
12V
R-W
G-RL1
5
UL1
8 J/B No.1
W-B
W-BW-BR-W
G-R
R-W
G-R
G-R R-W
W-B
IL1
IL1IL1 ID1ID17
1 2
1 10 1
16
4
2 310
9 IJ
ID8
IHIE
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-653
881 Author
: Date
:
1997 SUPRA (RM502U)
Door Lock Control Switch Circuit
CIRCUIT DESCRIPTION
When the door lock control switch is pushed to the lock side, Lock terminal of the switch is grounded, and
when the switch is pushed to the unlock side, unlock terminal is grounded (See wiring diagram below).
WIRING DIAGRAM
DI4XG-01

I02564
ON
2 (+)
1 (+)
3 (+)
1 (+) LH
RH
(+) (-)
DI-654
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
882 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check voltage between terminals 2(3), 1(1) of door lock control switch connector
and body ground.
PREPARATION:
Remove the door trim.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals 2(3), 1(1) of door lock
control switch connector and body ground, when door
lock control switch is pressed to the lock side, unlock side
and OFF position.
OK:
Switch positionTerminal 2(3)Terminal 1(1)
Lock sideBelow 1 V8 - 10 V
Unlock side8 - 10 VBelow 1 V
OFF8 - 10 V8 - 10 V
HINT:
The terminal number without brackets is for the LH, the number
with brackets is for the RH.
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-615).
NG

I02565
2
1
8
2 LH
RH
3
4
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-655
883 Author
: Date
:
1997 SUPRA (RM502U)
2 Check door lock control switch.
PREPARATION:
Disconnect the door lock control switch connector.
CHECK:
Check continuity between terminals 2(3), 1(2), 8(4) of door lock
control switch connector, when door lock control switch is
pressed to the lock side, and unlock side and OFF position.
OK:
Switch positionTerminal No. to continuity
Lock side2(3) - 8(4)
Unlock side1(2) - 8(4)
OFF
HINT:
The terminal number without brackets is for the LH, the number
with brackets is for the RH.
NG Replace door lock control switch.
OK
3 Check harness and connectors between ECU and door lock control switch,
switch and body ground (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace ECU. *1
*1: Malfunction of the ECU can be considered possible only when the problem symptom as follows:
Lock and/or unlock using the Door Lock Control Switch cannot be done, neither on the driver's side nor
on the passenger's side.

I02566
Door Key Lock and
Unlock Switch LHTheft Deterrent and
Door Lock ECU
Door Key Lock and
Unlock Switch RH J/B No.1
W-B
W-BT13
W-BW-BG-Y
WW
G-Y
G-YG-Y G
UL3
L2
UL2 W12V
12V
1J1
1D 10
IL1 161
2
2
1 33ID1
ID1
IL1
IL1273 13
6
22
16
IE
IH
DI-656
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
884 Author
: Date
:
1997 SUPRA (RM502U)
Door Key Lock and Unlock Switch Circuit
CIRCUIT DESCRIPTION
The door key lock and unlock switch is built in the door key cylinder.
When the key is turned to the lock side, terminal 3 of the switch is grounded and when the key is turned to
the unlock side, terminal 1 of the switch is grounded.
WIRING DIAGRAM
DI4XH-01

N16147
2
31
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-657
885 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check door key lock and unlock switch.
PREPARATION:
(a) Remove the door trim and service hole cover.
(b) Disconnect the door key lock and unlock switch connec-
tor.
CHECK:
Check continuity between terminals 1, 2 and 3 of door key lock
and unlock switch connector, when door key lock and unlock
switch is turned to the lock side, unlock side and when it is not
turned.
OK:
Switch positionTerminal No. to continuity
Lock side2 - 3
Unlock side1 - 3
OFF-
NG Replace door key lock and unlock switch.
OK
2 Check harness and connectors between ECU and switch, switch and body
ground (See page IN-28).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page DI-615).

I02567I02567
Theft Deterrent and
Door Lock ECU
Key Unlock Warning
SwitchT13
12V
Y
20 KSW
IF1 Y11
2 1 W-B J/B No.1
W-B
1K
1J12
1
IE
DI-658
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
886 Author
: Date
:
1997 SUPRA (RM502U)
Key Unlock Warning Switch Circuit
CIRCUIT DESCRIPTION
The key unlock warning switch goes on when the ignition key is inserted in the key cylinder and goes off when
the ignition key is removed.
The ECU operates the key confinement prevention function while the key unlock warning switch is on.
WIRING DIAGRAM
DI4XI-01

I02712
Disconnect
1
2
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-659
887 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check key unlock warning switch.
PREPARATION:
Disconnect key unlock warning switch connector.
CHECK:
Check continuity between terminal 1 and 2 of key unlock warn-
ing switch connector, when the key is inserted to the key cylin-
der or removed.
OK:
Switch positionTerminal No. to continuity
ON (Key inserted)1 - 2
OFF (Key removed)-
NG Replace key unlock warning switch.
OK
2 Check harness and connectors between ECU and key unlock warning switch,
key unlock warning switch and body ground (See page IN-28).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page DI-615).