1997 TOYOTA SUPRA instrument panel

I02540
START
Disconnect
SPLY (+)
DI-620
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
848 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
This troubleshooting is based on the premise that engine cranking occurs.
If the engine does not crank, proceed to the engine troubleshooting on page DI-3 or DI-141 (Vol. 1).
1 Check voltage between terminal SRLY of theft deterrent and door lock ECU con-
nector and body ground.
PREPARATION:
(a) Remove the instrument panel. (See page BO-50)
(b) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal SRLY of theft deterrent ECU
connector and body ground, when ignition switch is turned to
ST position.
OK:
Voltage: 10 - 14 V
OK Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between starter and theft deterrent and door lock ECU
(See page IN-28).

I02711
LOCK
Disconnect
HORN (+)
DI-622
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
850 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check voltage between terminal HORN of theft deterrent and door lock ECU con-
nector and body ground.
PREPARATION:
(a) Remove the instrument panel. (See page BO-50).
(b) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal HORN of theft deterrent
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 horn
relay (See page IN-28).

I02544
LOCK
Disconnect
HEAD (+)
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-627
855 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the headlights light up normally whenever the light control
switch is operated. If headlight operation is not normal when the light control switch is operated, proceed
to troubleshooting on page BE-2.
1 Check voltage between terminal HEAD of theft deterrent and door lock ECU con-
nector and body ground.
PREPARATION:
(a) Remove the instrument panel. (See page BO-50)
(b) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal HEAD of theft deterrent
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 head-
light control relay (See page IN-28).

I02546
LOCK
Disconnect
TAIL (+)
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-629
857 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check voltage between terminal TAIL of theft deterrent door lock 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 TAIL of theft deterrent and
door lock ECU connector and body ground.
OK:
Voltage: 10 - 14 V
OK Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between theft deterrent and door lock ECU and taillight
control relay (See page IN-28).

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).

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).

5
B
I :Junction Block (The number in the circle is the
J/B No. and the connector code is shown beside
it). Junction Blocks are shaded to clearly
separate them from other parts .
A :System Title
B :Indicates a Relay Block. No shading is used and only the
Relay Block No. is shown to distinguish it from the J/B.
Example: 1 Indicates Relay Block No. 1.
C :Indicates the connector to be connected to a
part (the numeral indicates the pin No.)
Explanation of pin use.J :Indicates the wiring color.
Wire colors are indicated by an alphabetical code.
B = Black
BR = Brown
G = Green
GR = GrayL = Black
LG = Light Green
O = Orange
P = PinkR = Red
V = Violet
W = White
Y = Yellow
The first letter indicates the basic wire color and the second
letter indicates the color of the stripe.
D :Connector Color Connectors not indicated are milky
white in color:
E :( ) is used to indicate different wiring and connector, etc.
when the vehicle model, engine type, or specification is
different.
F :Indicates related system.
G :Indicates the wiring harness and wiring harness
connector. The wiring harness with male terminal is
shown with arrows ( ).
Example: L - Y
K :Indicates a wiring Splice Point (Codes are Eº for
the Engine Room, Iº for the Instrument Panel,
and Bº for the Body).
Example:
The Location of Splice Point I 5 is indicated by the shaded
section.
L :Page No.
M :Indicates a shielded cable.
Example:N :Indicates a ground point.
The first letter of the code for each ground point(s) indicates
the component's location, e.g. Eº for the Engine
Compartment, Iº for the Instrument Panel and Surrounding
area, and Bº for the Body and Surrounding area.
The first letter of the code for each wiring harness and wiring
harness connector(s) indicates thecomponent's location, e.g,
Eº for the Engine Compartment, Iº for the Instrument Panel
and Surrounding area, and Bº for the Body and Surrounding
area.
When more than one code has the first and second letters in
common, followed by numbers (e.g, IH1, IH2), this indicates
the same type of wiring harness and wiring harness connector.
P :When 2 parts both use one connector in common, the parts
connector name used in the wire routing section is shown in
square brackets [ ]. O :Indicates the pin number of the connector.
The numbering system is different for female and male
connectors.
H :Represents a part (all parts are shown in sky
blue). The code is the same as the code used in
parts position.
3B indicates
that it is inside
Junction Block
No. 3. v
v The pins shown are only for the highest grade, or only
include those in the specification.
lower rightlower left
(blue) (yellow)

6
B HOW TO USE THIS MANUAL
WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS TO TERMINAL 3 OF THE POWER WINDOW MASTER SW, TERMINAL 2 OF THE POWER WINDOW CONTROL
RELAY AND TERMINAL 8 OF THE POWER WINDOW SW THROUGH THE DOOR FUSE.
1. DRIVER'S WINDOW MANUAL UPº OPERATION BY MASTER SW
HOLDING MANUAL SW (DRIVER'S) ON UPº POSITION LOCATED IN POWER WINDOW MASTER SW, THE CURRENT FLOWS TO TERMINAL 5 OF THE POWER WINDOW CON-
TROL RELAY THROUGH TERMINAL 3 OF THE MASTER SW TERMINAL 2 TO OPERATE A POWER WINDOW CONTROL RELAY. THUS THE CURRENT INSIDE THE RELAY
FLOWS FROM TERMINAL 2 OF THE RELAY TERMINAL 1 TERMINAL 2 OF THE POWER WINDOW MOTOR TERMINAL 1 TERMINAL 4 OF THE RELAY TERMI-
NAL 3 TO GROUND. THE MOTOR TURNS TO ASCENT THE WINDOW. RELEASING THIS SW, THE ROTATION OF MOTOR IS STOPPED AND THE WINDOWS CAN STOP AT
WILL POINT.
(FOR THE MANUAL DOWNº OPERATION, CURRENT FLOWS IN THE REVERSE DIRECTION BECAUSE THE TERMINALS WHERE IT FLOW ARE CHANGED).
2. DRIVER'S WINDOW AUTO DOWNº OPERATION BY MASTER SW
ONCE THE AUTO DOWNº BUTTON OF THE MASTER SW IS PUSHED, THE CURRENT FLOW TERMINAL 9 OF THE POWER WINDOW CONTROL RELAY THROUGH TERMINAL 3
OF THE MASTER SW TERMINALS 8 AND 9 TO OPERATE THE RELAY. THUS THE CURRENT INSIDE THE POWER WINDOW CONTROL RELAY FLOWS FROM TERMINAL 2 OF
THE RELAY TERMINAL 4 TERMINAL 1 OF THE POWER WINDOW MOTOR TERMINAL 2 TERMINAL 1 OF THE RELAY TERMINAL 3 TO GROUND. THE
MOTOR CONTINUES THE ROTATION ENABLING TO DESCENT THE WINDOW.
THE WINDOW DESCENDS TO THE END POSITION. THE CURRENT WILL BE CUT OFF TO RELEASE THE AUTO DOWN FUNCTION BASED ON THE INCREASING CURRENT
BETWEEN TERMINAL 2 OF THE RELAY AND TERMINAL 1 IN RELAY.
3. DRIVER'S WINDOW AUTO DOWN RELEASE OPERATION BY MASTER SW
HOLDING THE MANUAL SW (DRIVER'S) ON UPº POSITION IN OPERATING AUTO DOWN. THE CURRENT FROM TERMINAL 3 OF THE MASTER SW PASSING TERMINAL 2
FLOWS TERMINAL 5 OF THE RELAY AND RELEASES THE AUTO DOWN FUNCTION IN THE POWER WINDOW CONTROL RELAY. RELEASING THE HAND FROM SW, WINDOW
STOPS AND CONTINUING ON TOUCHING SW. THE FUNCTION SWITCHES TO MANUAL UP OPERATION.
4. PASSENGER'S WINDOW UP OPERATION (MASTER SW) AND WINDOW LOCK SW OPERATION
HOLDING PASSENGER'S WINDOW SW (MASTER SW) ON UPº, THE CURRENT FLOWS FROM TERMINAL 3 OF THE MASTER SW PASSING TERMINAL 6 TO TERMINAL 3 OF THE
POWER WINDOW SW (PASSENGER'S) TERMINAL 4 TERMINAL 2 OF THE MOTOR TERMINAL 1 TERMINAL 9 OF THE POWER WINDOW SW TERMINAL 7 
TERMINAL 1 OF THE MASTER SW TERMINAL 4 TO GROUND. THE MOTOR RUNS TO ASCENT THE WINDOW. RELEASING THIS SW, THE ROTATION OF MOTOR IS
STOPPED AND WINDOW CAN STOP AT WILL PLACE. SWITCHING THE WINDOW LOCK SW IN LOCKº POSITION, THE CIRCUIT IS OPENED AND STOPPED THE MOTOR ROTA-
TION.
(FOR THE DOWN OPERATION, CURRENT FLOWS IN THE REVERSE DIRECTION BECAUSE THE TERMINALS WHERE IT FLOWS ARE CHANGED).
P 2 POWER WINDOW CONTROL RELAY
3-GROUND: ALWAYS CONTINUITY
2-GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
5-GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION AND THE MASTER SW AT UP POSITION
8-GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION AND THE MASTER SW AT AUTO DOWN POSITION
9-GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION AND THE MASTER SW AT DOWN OR AUTO DOWN POSITION
P 4 POWER WINDOW MASTER SW
4-GROUND: ALWAYS CONTINUITY
3-GROUND: APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
WINDOW LOCK SW
OPEN WITH THE WINDOW LOCK SW AT LOCK POSITION
: PARTS LOCATION
CODE SEE PAGE CODE SEE PAGE CODE SEE PAGE
P221P421P621
P321P521
: RELAY BLOCKS
CODE SEE PAGE RELAY BLOCK (RELAY BLOCK LOCATION)
116 R/B NO. 1 (INSTRUMENT PANEL LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE SEE PAGE JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
3814 J/B NO. 3 AND COWL WIRE (INSTRUMENT PANEL LEFT SIDE)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE SEE PAGE JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
ID126 FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)
IH126 FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)
: GROUND POINTS
CODE SEE PAGE GROUND POINT LOCATION
IC24 COWL LEFT
: SPLICE POINTS
CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS
I 524 COWL WIREQ
R
S
T
U
V
W
X
SERVICE HINTS
SYSTEM OUTLINE