1995 TOYOTA SUPRA reset

PRECAUTION
Take care to observe the doing precautions when performing inspections or removal and replacement of
body electrical related parts.
HEADLIGHT SYSTEM
wHalogen bulbs have pressurized gas inside and require special handling. They can burst if scratched or
dropped. Hold a bulb only by its plastic or metal case.
Don't touch the glass part of a bulb with bare hands.
SRS (SUPPLEMENTAL RESTRAINT SYSTEM)
wWork must be started after 90 seconds from the time the ignition switch is turned to the ºLOCKº position
and the negative (±) terminal cable is disconnected from the battery.
wWhen disconnecting any of the connectors in the SRS, be sure to lock the ignition switch and disconnect
the negative (±) terminal cable from the battery first. Since the connectors are twin lock type connectors,
disconnect the connectors only after releasing the first stage lock.
wWhen connecting SRS connectors, be sure to lock them securely. (If the connectors are not locked
securely, the system may not operate when needed.)
wAlways store the steering wheel pad with the pad surface facing upward. (Storing the pad with its metallic
surface up may lead to a serious accident if the SRS inflates for some reason.)
wWhen installing the spiral cable, be sure the vehicle is in the straight ahead condition and confirm that the
spiral cable is in the neutral position when it is installed.
wINFORMATION LABELS (NOTICE) are attached to the periphery of the SRS components. Follow the
NOTICE.
AUDIO SYSTEM
wIf the negative (±) terminal cable is disconnected from the battery, the preset AM, FM 1 and FM 2 stations
stored in memory are erased, so be sure to note the stations and reset them after the battery terminal is
reconnected.
wIf the negative (±) terminal cable is disconnected from the battery, the ºANTI±THEFT SYSTEMº will operate
when the cable is reconnected, but the radio, tape player and CD player will not operate. Be sure to input
the correct ID number so that the radio, tape player and CD player can be operated again.
MOBILE COMMUNICATION SYSTEM
wIf the vehicle is equipped with a mobile communication system, refer to precautions in the IN section. BE±2
± BODY ELECTRICAL SYSTEMPRECAUTION

TROUBLESHOOTING
NOTICE: When replacing the internal mechanism (computer part) of the audio system, be careful
that no part of your body or clothing comes in contact with the terminals of the leads from the IC,
etc. of the replacement part (spare part).
HINT: This inspection procedure is a simple troubleshooting which should be carried out on the vehicle
during system operation and is based on the assumption that the cause of trouble lies with the system com-
ponents (except for the wires and connectors, etc.).
Always inspect the trouble taking the following items into consideration.
w Open or short circuit of the wire harness
w Connector or terminal connection fault
w Troubleshooting items marked *indicate that ºTroubleshooting for ANTI±THEFT SYSTEMº should be
carried out first.
 Problem No.  No power coming in. *1  Power coming in, but radio not operating. 2  Noise present, but AM±FM not operating. 3
  Either speaker does not work. 4
  Woofer speaker does not work. 5
 Radio Either AM or FM does not work. 6
  Reception poor (Volume faint). 6
  Few preset tuning bands. 6
  Sound quality poor. 7
  Cannot set station select button. 8
  Preset memory disappears. 8
  Cassette tape cannot be inserted. 9
Cassette tape inserts, but no power.*10  Power coming in, but tape player not operating. 11  Either speaker does not work. 12 Tape player Woofer speaker does not work. 13 y Sound quality poor (Volume faint). 14  Tape jammed, malfunction with tape speed or auto±reverse. 15  APS, SKIP, RPT buttons not operating. 16
  Cassette tape will not eject. *17
  CD cannot be inserted. 18
  CD inserts, but no power. 19
  Power coming in, but CD player not operating. 20
 CDplayer Sound jumps. 21
 CD player Sound quality poor (Volume faint). 22
  Either speaker does not work. 23
  Woofer speaker does not work. 24
  CD will not eject. 25
No power coming in.26 
Amplifier
 Power coming in, but woofer amplifier (Power amplifier) not operating. 27 Amplifier Either speaker does not work. 28  Woofer speaker does not work. 29
BE±86± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Poor signals, poor location.
Radio assembly faulty.
Power amplifier faulty.
Go to No. 32.
Is tape player operating normally?Radio assembly faulty?
Speaker faulty.
Radio assembly faulty.
Hissing sound from speaker?Power amplifier faulty. Recheck system after repair.
Radio assembly faulty. Recheck system after repair.
Problem with radio wave signals or
location? (See SYSTEM DESCRIPTION)
Are both AM and FM defective?
Is power for the antenna being output
from the radio assembly.
Is power for the antenna being output
from the power amplifier?
Temporarily install another speaker.
Functions OK?
RadioEITHER AM OR FM DOES NOT WORK, RECEPTION
POOR (VOLUME FAINT), FEW PRESET TUNING BANDS
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±93

Replace fuse.
Radio assembly faulty.Can cassette tape be installed in tape player?
Check RAD No. 1 fuse is OK?
Is +B applied to power amplifier?+B wire harness faulty.
GND faulty.
Is +B applied to radio assembly?+B wire harness faulty.
Power amplifier faulty.
GND faulty.
Power amplifier faulty.
Radio assembly faulty.
Check if GND (wire harness side)
to power amplifier.
Check if GND (wire harness side) to radio
assembly?
CANNOT SET STATION SELECT BUTTON, PRESET
MEMORY DISAPPEARSRadio
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±95

Display E:
ANTI±THEFT SYSTEM
operation condition.
(ID number input error
10 times or more.)Display A:
ID Number is set.Display B
Anti±theft
SystemTROUBLESHOOTING FOR ANTI±THEFT SYSTEM
Turn Ignition key from Lock position to ACC position.
Cancel ID number, refer to each malfunction item.
Take to designated radio
service station.
[ISEC] Display Disappears
After 1 Second.
Normal operation
Refer to each
malfunction item.
(Liquid Crystal Display (LCD) for Audio System)
Cancel ID number, refer to each malfunction item.
ANTI±THEFT SYSTEM operation condition.
[ID number input error 9 times or less.]
Input ID number to cancel ANTI±THEFT SYSTEM, and check display.
Radio switch ON.
ANTI±THEFT SYSTEM not
cancelled.
(ID number input error 9
times or less.)
ANTI±THEFT SYSTEM cancelled.
Check audio system again.
Radio Display
Display BDisplay D
Radio switch ON.
Display EDisplay C"ADisplay BDisplay A " B
Display D
Radio switch ON.Take to designated radio
service station.Refer to each
malfunction item.
Normal
operation
Normal operation.
ID number
input error
time
Blank,
No Illumination
Display B
Display E
Display DDisplay ADisplay C
HINT:
a) Refer to O/M for operation details of ANTI±THEFT SYSTEM.
b) When the ID number has been cancelled, reset the same number after completing the operation,
or inform the customer that it has been cancelled.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±111

SYSTEM INSPECTION
1. SETTING OF THE THEFT DETERRENT SYSTEM
Setting Conditions
(a) Close all the doors.
(b) Close the engine hood and luggage compartment door.
(c) Remove the ignition key from the ignition key cylinder.
Setting Operation
When any of the following operations (a) or (c) is done, the theft deterrent indicator light will light up as de-
scribed.
(a) Lock the left or right front door using the key.
(All doors are locked by key±interlinked lock operation)
(b) With the rear doors locked and with one of the front doors locked, lock the other front door without
using the key (keyless door lock).
 
 Elapsed time after operation
 
 Indicator light
  Within about 30 seconds  Lights up
  After about 30 seconds  Blinks *1
*1: 1 sec. on, 1 sec. off
HINT: When the theft deterrent system is set, doors cannot be locked or unlocked with the door lock control
switch and the luggage compartment door cannot be unlocked with the luggage compartment door opener
switch.
2. CANCELLING OF THE THEFT DETERRENT SYSTEM IN THE SET CONDITION
Check if the theft deterrent indicator light is blinking.
Cancelling Operation
When any of the following operation (a), (b), (c) or (d) is done, the theft deterrent system is cancelled and
indicator light will go off.
(a) Unlock the left or right front door using the key.
(b) Insert the ignition key in the ignition key cylinder and turn it to the ACC or ON position.
(This is operative only when the theft deterrent system has never operated.)
(c) Unlock the luggage compartment door with the key. *
1
*1: The theft deterrent system is temporarily cancelled only while the luggage compartment door is
open. Approximately 2 seconds after the luggage compartment door is closed, the theft deterrent
system is reset.
± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEMBE±121

3. CHECK OF THE THEFT DETERRENT SYSTEM OPERATION.
Check if the theft deterrent indicator light is blinking.
When any of the following operations (a) or (b) is done, the system sounds the horns and theft deterrent
horn and flashes the headlights and taillights for about one minute to alert. At the same time, the system
disconnects the starter motor circuit and locks all doors (if all doors are not locked, the system repeats door
locking operation every 2 seconds during the one minute alert time).
(a) Open the engine hood using the engine hood opener lever.
(b) Unlock any of the front or rear doors without key operation.
4. CANCELLING OF THE THEFT DETERRENT SYSTEM IN OPERATING CONDITION.
The theft deterrent operation can be cancelled when any of the following conditions is met:
 No. Condition Cancelling Operation 
 1
 
 Unlock left or right door with the key.
 
 
 2 Unlock doors with wireless door lock control system. 
 3 Insert key into ignition key cylinder and turn it to ACC or ON position. *2
 4 About 1 minute passes after theft deterrent operation begins. Automatic stop *1
*1: In this case, the theft deterrent system resets in about 2 seconds after if all doors are closed.
*
2: The alarm will be off, but the engine will not operate. To restart the engine, see No.1.
ECU TERMINAL VALUES MEASUREMENT
USING TOYOTA BREAK±OUT±BOX AND
TOYOTA HAND±HELD TESTER
1. Hook up the TOYOTA break±out box and TOYOTA handheld
tester to the vehicle.
2. Read the ECU input/output values by following the prompts
on the hand±held tester screen.
HINT: TOYOTA hand±held tester has a ºShapshotº func-
tion. This records the measured values and is effective in
the diagnosis of intermittent problems.
Please refer to the TOYOTA hand±held tester/TOYOTA
break±out±box operator's manual for further details. BE±122
± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM

DTC 21 23 Speed Sensor Circuit
The speed sensor signal is sent to cruise control ECU as ve-
hicle speed signal.
The rotor shaft is driven by the gear of the transmission. For
each rotation of the shaft, the speed sensor sends a 4±pulse
signal to the combination meter.
This signal is converted inside the combination meter and
sent as a 4±pulse signal to the cruise control ECU.
The ECU calculates the vehicle speed from this pulse fre-
quency.
CIRCUIT DESCRIPTION
Speed signal is not input to the ECU while
cruise control is set..
Vehicle speed decrease 16 km/h or more
than preset speed.
Vehicle speed sensor pulse is abnormal.
Speed sensor
Combination meter
Harness or connector between speed sen-
sor and combination meter, combination
meter and ECU.
ECU
Actuator
Speed sensor
Harness or connector in OD and SPD cir-
cuit (Open or short intermittently)
ECU
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±177