TOYOTA SUPRA 1997 Service Repair Manual

I11I11
B 9 I24 BQ1 4
IC1 6
34 12
34 12
221
BQ1 2
BI IGIG Y- R Y- RB
B
Y- R
Y
Y- R
B
Y- R
B L W- BL W- B
W- B
W- B W- B
W- B W- BW- BB
1 462 FROM POWER SOURCE SYSTEM (
SEE PAGE 56)
Y
IC1 7
BQ1 3
B B
S 6
SEAT HEATER SWSEAT HEATER
(
DRIVER' S SEAT)
SEAT HEATER
(
FRONT PASSENGER' S SEAT) S12
S13SEAT HEATER RELAY
(
DRIVER' S SEAT) S14
SEAT HEATER RELAY
(
FRONT PASSENGER' S SEAT) S15
15A
SEAT- HTR
1H 16
1
LH RH
192
SEAT HEATER (CANADA)

193
S6 SEAT HEATER SW
4-GROUND ; APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
1-GROUND : ALWAYS CONTINUITY
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
S629S1331S1531
S1231S1431
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1H20COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IC136FLOOR NO. 2 WIRE AND COWL WIRE (LEFT KICK PANEL)
BQ142FLOOR NO. 2 WIRE AND SEAT WIRE (UNDER THE FRONT LH SEAT)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IG36RIGHT KICK PANEL
BI40LEFT QUARTER PILLAR
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
I1138COWL WIREB942SEAT WIRE
I2438COWL WIRE
12 4 6
12 12 S 6BLACKS14 S15
S13BLUE
S12BLUE
12
3412
34
SERVICE HINTS

1 2
2 1SEAT BELT
WARNING LIGHT
[TELLTALE
LIGHT RH] T 6
Y
W- B
IE BI
R- B R- BY W- B
DOOR COURTESY
SW LH D10
2 3
I 7IC2 15
W- B
W- B W- B
B- W W- B
161
R
R
1B 5
1J 11C12 1I16 1I 15 INTEGRATION RELAY
86 5 17
10
1K 121E 1
Y-
9
1E 12 27. 5A
DO ME10A
GAUGE FROM POWER SOURCE SYSTEM (
SEE PAGE 56)
2 1

UNLOCK
WARNING SWBUCKLE
SW LH B 6 U 1
194
UNLOCK AND SEAT BELT WARNING

195
CURRENT ALWAYS FLOWS TO TERMINAL 1 OF THE INTEGRATION RELAY THROUGH DOME FUSE.
1. SEAT BELT WARNING SYSTEM
WHEN THE IGNITION SW IS TURNED ON, CURRENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 7 OF THE
INTEGRATION RELAY. AT THE SAME TIME, CURRENT FLOWS TO TERMINAL 9 OF THE RELAY FROM THE GAUGE
FUSE THROUGH THE SEAT BELT WARNING LIGHT. THIS CURRENT ACTIVATES THE INTEGRATION RELAY AND
CURRENT FLOWING THROUGH THE WARNING LIGHT FLOW FROM TERMINAL 9 OF THE RELAY " TERMINAL 10 "
GROUND, CAUSING THE WARNING LIGHT TO LIGHT UP. A BUCKLE SW OFF SIGNAL IS INPUT TO TERMINAL 8 OF
THE RELAY, THE CURRENT FLOWING TO TERMINAL 7 OF THE RELAY FLOWS THROUGH TERMINAL 10 " GROUND
AND THE SEAT BELT WARNING BUZZER SOUNDS FOR APPROX. 4-8 SECONDS. HOWEVER, IF THE SEAT BELT IS
PUT ON DURING THIS PERIOD (WHILE THE BUZZER IS SOUNDING), SIGNAL INPUT TO TERMINAL 8 OF RELAY
STOPS AND THE CURRENT FLOW FROM TERMINAL 7 OF THE RELAY "TERMINAL 10 "GROUND IS CUT,
CAUSING THE BUZZER TO STOP.
2. UNLOCK WARNING SYSTEM
WITH THE IGNITION KEY INSERTED IN THE KEY CYLINDER (UNLOCK SW ON), THE IGNITION SW STILL OFF AND
DRIVER'S DOOR OPENS (DOOR COURTESY SW ON), WHEN A SIGNAL IS INPUT TO TERMINAL 6 OF THE RELAY, THE
INTEGRATION RELAY OPERATES, CURRENT FLOWS FROM TERMINAL 7 OF THE RELAY "TERMINAL 10 "
GROUND AND UNLOCK WARNING BUZZER SOUNDS.
B6 BUCKLE SW LH
1-2 : CLOSED WITH THE DRIVER'S SEAT BELT IN USE
D10 DOOR COURTESY SW LH
3-2 : CLOSED WITH THE LH DOOR OPEN
U1 UNLOCK WARNING SW
2-1 : CLOSED WITH THE IGNITION KEY IN CYLINDER
INTEGRATION RELAY
10-GROUND : ALWAYS CONTINUITY
6-GROUND : CONTINUITY WITH THE DRIVER'S DOOR OPEN
5-GROUND : CONTINUITY WITH THE IGNITION KEY IN CYLINDER
8-GROUND : CONTINUITY WITH THE DRIVER'S SEAT BELT IN USE
9-GROUND :0 VOLTS WITH THE IGNITION SW ON AND BUCKLE SW OFF
1-GROUND : ALWAYS APPROX. 12 VOLTS
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
B628T629
D1030U129
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B20ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1C20FLOOR NO. 2 WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1E20INSTRUMENT PANEL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1I
1J20COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1K
()
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IC236FLOOR NO. 2 WIRE AND COWL WIRE (LEFT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IE36LEFT KICK PANEL
BI40LEFT QUARTER PILLAR
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
I738FLOOR NO. 2 WIRE
SYSTEM OUTLINE
SERVICE HINTS

196
UNLOCK AND SEAT BELT WARNING
12231
XX16X B 6 D1 0 T 6 U 1
2 1

12X X
10 X X
16XX X
X13223 C14 R15 W 1
BLACKBLAC K
203
REAR WIPER AND WASHER

IC2 1
BM1 5
BO1 4IC2 13 IC24
BM1 4BM13
BO1 2BO15 IB21
M 23
IE LLG
L
L
L L L L
LG
LG- R
LG- B
W- B LG- B
LG- R LG- R
LG- B LG- R
LG- B
W- B W- BL
2 1 10 16
32 REAR WIPER AND WASHER SW C14
WASHER MOTOR W 1
TO
FRONT WI PER MOTOR
REAR WIPER MOTOR AND RELAY R15 FROM POWER SOURCE SYSTEM (
SEE PAGE 56)
E 9 : 2JZ- GTE
E21 : 2J Z- GE
20A
WIPER
1H 51A1
1J 11K 12
M
R
L
Y
1LS C1
LM +B SM LM L SM +BREAR WIPER RELAY
REAR WIPER
MOTORLC1
B
WASHER1
OFF
INT
ON
WASHER2 [COMB. SW]
204
REAR WIPER AND WASHER

205
WHEN THE IGNITION SW IS TURNED ON, CURRENT FLOWS TO TERMINAL 2 OF THE WASHER MOTOR, TERMINAL 1
OF THE REAR WIPER MOTOR AND RELAY THROUGH THE WIPER FUSE.
1. REAR WIPER NORMAL OPERATION
WITH THE IGNITION SW TURNED ON AND REAR WIPER AND WASHER SW TURNED ON, THE CURRENT FLOWING TO
TERMINAL 1 OF THE REAR WIPER RELAY FLOWS TO TERMINAL 3 OF THE RELAY "TERMINAL 1 OF THE REAR
WIPER AND WASHER SW "TERMINAL 16 "TO GROUND. THUS, THE RELAY COIL IS ACTIVATED AND THE
CURRENT TO TERMINAL 1 OF THE RELAY FLOWS TO "TERMIANL LH " TERMINAL LH OF THE REAR WIPER
MOTOR "MOTOR "TO GROUND AND CAUSES THE MOTOR TO OPERATE THE WIPER.
2. REAR WIPER INTERMITTENT OPERATION
WHEN THE IGNITION SW IS ON AND THE REAR WIPER AND WASHER SW IS TURNED TO INT POSITION, CURRENT
FLOWING TO TERMINAL 1 OF THE REAR WIPER MOTOR AND RELAY FLOWS TO TERMINAL 2 OF THE RELAY "
TERMINAL 10 OF THE REAR WIPER AND WASHER SW "TERMINAL 16 "GROUND.
THIS CAUSES THE MOTOR TO OPERATE (THE POINT CHANGES) AND THE INTERMITTENT CIRCUIT OF THE RELAY
OPERATES. INTERMITTENT OPERATION OF THE CIRCUIT IS CONTROLLED BY THE CHANGING AND DISCHARGING
OF THE CONDENSER INSTALLED INSIDE THE RELAY.
3. WASHER OPERATION
WITH THE IGNITION SW TURNED ON AND THE REAR WIPER AND WASHER SW TURNED TO ON POSITION, WHEN
THE WIPER SW IS TURNED FURTHER, THE CURRENT FLOWING TO TERMINAL 2 OF THE WASHER MOTOR FLOWS
TO TERMINAL 3 OF THE MOTOR "TERMINAL 2 OF THE REAR WIPER AND WASHER SW "TERMINAL 16 "TO
GROUND, SO THAT THE WASHER MOTOR ROTATES AND THE WINDOW WASHER EJECTS THE SPRAY, ONLY WHILE
THE SWITCH IS FULLY TURNED.
WHEN THE WIPER SW IS OFF AND THEN TURNED TO WASHER ON (WIPER OFF SIDE), ONLY THE WASHER
OPERATES.
W1 WASHER MOTOR
2-GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
3-GROUND : CONTINUITY WITH THE WASHER SW TURNED ON
R15 REAR WIPER MOTOR AND RELAY
1-GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
2-GROUND : CONTINUITY WITH THE REAR WIPER SW AT INT POSITION
3-GROUND : CONTINUITY WITH THE REAR WIPER SW AT ON POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C1428W125 (2JZ-GTE)
R1530W127 (2JZ-GE)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A20ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1H
1J20COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1K
()
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IB236ENGINE ROOM MAIN WIRE AND COWL WIRE (LET KICK PANEL)
IC236FLOOR NO. 2 WIRE AND COWL WIRE (LEFT KICK PANEL)
BM140BACK DOOR NO. 1 WIRE AND FLOOR NO. 2 WIRE (LEFT SIDE OF PACKAGE TRAY TRIM)
BO140BACK DOOR NO. 2 WIRE AND BACK DOOR NO. 1 WIRE (BACK DOOR UPPER LEFT)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IE36LEFT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E932ENGINE ROOM MAIN WIREE2134ENGINE ROOM MAIN WIRE
SYSTEM OUTLINE
SERVICE HINTS

197
SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following
precautionary instructions and the procedure and precautions in the Repair Manual for the applicable model year.

Malfunction symptoms of the supplemental restraint system are difficult to confirm, so the diagnostic trouble
codes become the most important source of information when troubleshooting.
When troubleshooting the supplemental restraint system, always inspect the diagnostic trouble codes before
disconnecting the battery.

Work must be started after 90 seconds from the time the Ignition SW is set to the LOCKº position and the
negative (-) terminal cable is disconnected from the battery.
(The supplemental restraint system is equipped with a back-up power source so that if work is started within 90
seconds of disconnecting the negative (-) terminal cable of the battery, the SRS may be activated.)
When the negative (-) terminal cable is disconnected from the battery, memory of the clock and audio systems
will be cancelled. So before starting work, make a record of the contents memorized by each memory system.
When work is finished, reset the clock and audio system as before and adjust the clock.
To avoid erasing the memory of each memory system, never use a back-up power supply from outside the
vehicle.

When removing the steering wheel pad or handling a new steering wheel pad, keep the pad upper surface facing
upward. Also, lock the lock lever of the twin lock type connector at the rear of the pad and take care not to
damage the connector.
(Storing the pad with its metallic surface up may lead to a serious accident if the SRS inflates for some reason.)

Always store a removed or new front passenger airbag assembly with the airbag door facing up. Storing the
airbag assembly with the airbag door facing down could cause a serious accident if the airbag inflates.

Store the steering wheel pad where the ambient temperature remains below 93C (200F), without high humidity
and away from electrical noise.

Never use SRS parts from another vehicle. When replacing SRS parts, replace them with new parts.

Never disassemble and repair the steering wheel pad, front passenger airbag assembly, airbag sensor assembly.

Before repairing the body, remove the airbag sensors if during repair shocks are likely to be applied to the
sensors due to vibration of the body or direct tapping with tools or other parts.

Do not reuse a steering wheel pad.
After evaluating whether the airbag sensor assembly is damaged or not, decide whether or not to reuse it.
(See the Repair Manual for the method for evaluating the airbag sensor assembly.)

When troubleshooting the supplemental restraint system, use a high-impedance (Min. 10 kW/V) tester.

The wire harness of the supplemental restraint system is integrated with the cowl wire harness assembly. The
vehicle wiring harness exclusively for the airbag system is distinguished by corrugated yellow tubing, as are the
connectors.

Do not measure the resistance of the airbag squibs.
(It is possible this will deploy the airbag and is very dangerous.)

If the wire harness used in the supplemental restraint system is damaged, replace the whole wire harness
assembly.

INFORMATION LABELS (NOTICES) are attached to the periphery of the SRS components. Follow the
instructions on the notices.

The SRS has connectors which possess the functions described below:
1. SRS ACTIVATION PREVENTION MECHANISM
Each connector contains a short spring plate. When the
connector is disconnected, the short spring plate automatically
connects the power source and grounding terminals of the
squib to preclude a potential difference between the terminals.
2. ELECTRICAL CONNECTION CHECK MECHANISM
This mechanism is designed to electrically checks if
connectors are connected correctly and completely.
The electrical connection check mechanism is designed so
that the disconnection detection pin connects with the
diagnosis terminals when the connector housing lock is in to
locked condition.
198SRS