1997 TOYOTA SUPRA warning light

W02760AB0119
H00048
ON
Airbag Sensor Assembly
LA
(-)
(+)
H03185
P squib
Spiral
Cable
Airbag Sensor
Assembly D squib
ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-601
829 Author
: Date
:
1997 SUPRA (RM502U)
3 Check SRS warning light circuit.
PREPARATION:
(a) Connect negative (-) terminal cable to battery.
(b) Turn the ignition switch to ACC or ON.
CHECK:
Measure the voltage LA terminal of harness side connector of
airbag sensor assembly.
OK:
Voltage: 10 - 14 V
NG Check SRS warning light balb/repair SRS warn-
ing light circuit.
OK
4 Does SRS warning light come on?
PREPARATION:
(a) Disconnect negative (-) terminal cable from the battery.
(b) Connect the airbag sensor assembly connector.
(c) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
(d) Turn the ignition switch to ACC or ON.
CHECK:
Check operation of SRS warning light.
NO Check terminal LA of airbag sensor assembly.
If normal, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

DI-602
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
830 Author
: Date
:
1997 SUPRA (RM502U)
5 Is new ECU-B fuse burnt out again?
NO Using simulation method, reproduce malfunc-
tion symptoms (See page IN-18).
YES
Check harness between ECU- B fuse and
SRS warning light.

H03189
Airbag Sensor
Assembly
Tc
7 21
II1 113
Tc
E1DLC1
BR P-B7
1E 1G
Junction Block No.1 P-B
R (*1)
P-B (*2) 3
11
IF1 R
Tc E1
DTC2 BR 18
IJ1 BR
BR
ED
*1: 2JZ-GE
*2: 2JZ-GTE
R-B
4 3P-B
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-603
831 Author
: Date
:
1997 SUPRA (RM502U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of the DLC1 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by the blinking of the SRS warning light.
WIRING DIAGRAM
DI4WU-02

H03186
ACC
ON
or LOCK
AB0118
R14305AB0119
H00030
ACC
ON
or
(-)DLC 1
(+)Tc E
1
DI-604
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
832 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
HINT:
If the DTC is not displayed, perform the following troubleshooting.
1 Does SRS warning light light up for approx. 6 seconds?
CHECK:
Check operation of SRS warning light after ignition switch is
turned from LOCK position to ACC or ON position.
NO Check SRS warning lights system
(See page DI-557).
YES
2 Check voltage between terminals Tc and E1 of DLC1.
PREPARATION:
Turn the ignition switch to ACC or ON.
CHECK:
Measure the voltage between terminals Tc and E1 of DLC1.
OK:
Voltage: 10 - 14 V
OK Go to step 4.
NG

AB0117 AB0118 AB0119W02763
H00049
LOCK
Airbag Sensor Assembly
TcACC
ON
or
DI-606
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
834 Author
: Date
:
1997 SUPRA (RM502U)
4 Check airbag sensor assembly.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c) Remove the steering wheel pad. (See SR section)
(d) Disconnect the connector of front passenger airbag as-
sembly. (See page RS-21)
(e) Disconnect the connector of airbag sensor assembly.
(See page RS-33)
(f) Insert the service wire into terminal Tc from back side as
shown.
(g) Connect the airbag sensor assembly connector with ser-
vice wire.
(h) Connect negative (-) terminal cable to battery.
(i) Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(j) Connect the service wire of terminal Tc to body ground.
CHECK:
Check operation of SRS warning light.
OK:
SRS warning light comes on.
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
OK Check harness between airbag sensor assem-
bly and DLC1.
NG
Replace airbag sensor assembly.

DI4WW-01
THEFT DETERRENT SYSTEM Check Sheet
Inspector 's name:
Customer 's Name
Date of VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading / /km
Mile
Weather Conditions
When Problem
Occurred Frequency Problem OccursWeather
Outdoor temperature
/ /

Constant
Sometimes ( Times per day, month)

Once only Brought in

Theft deterrent system cannot be set.

Indicator light does not flash when the theft deterrent system is set.
(It stays on or does not light at all.)

Theft deterrent system
does not operate.
When unlocked using the
door lock knob.

When the engine hood is
opened.

System cannot be
canceled once set.
When door is unlocked using key or wireless door lock control system.

When the key is inserted in the ignition key cylinder and turned to ACC or ON
position.
(However, only when the system has never operated)

When the luggage compartment door is opened with the key.

System cannot be
canceled during warning
operation.
When door is unlocked using key or wireless door lock control system.

When the key is inserted in the ignition key cylinder and turned to ACC or ON
position.

Warning operation starts when the system is set and the door or luggage compartment door is opened with
the key.

Others.
Date Problem First Occurred

Fine
Cloudy
Rainy
Snowy

Various/Others

Hot
Warm
Cool

Cold (Approx. 5F ( 5C))
Problem Symptom
Malfunction

Horns only

Theft deterrent horn only

Headlights only

Taillights only

Starter cut only

Door lock operation only
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-609
837 Author
: Date
:
1997 SUPRA (RM502U)
CUSTOMER PROBLEM ANALYSIS CHECK

DI4WZ-01
I02536
3
25 21
976411
10
24 23 18 85
22 21 2019 17 16 15 14 13 12 98 7
65432 1 T13
T7
Theft Deterrent and Door Lock Control ECU
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-613
841 Author
: Date
:
1997 SUPRA (RM502U)
TERMINALS OF ECM
TerminalsSymbolsConditionStandard Value
+B2 e Ground
(T7-9 eGround)L-W e GroundAlways.10 - 14 V
ACT- e ACT+ (T7-2 eT7-3)L-Y e L-RIgnition switch is turned to ºOFFº position.Below 50W
RLY e Ground
(T7-6 eGround)Y e GroundIgnition switch is turned to ºONº position.10 - 14 V
IG e Ground
(T7-7 eGround)B-R e GroundIgnition switch is turned to ºONº position.10 - 14 V
ACC e E (T7-8 eT7-4)L-Re W-BIgnition switch is turned to ºACCº position.10 - 14 V
+B1 e Ground
(T13-1 eGround)R e GroundAlways.10 - 14 V
DSWLE (T13 4T7 4)LGWBLuggage compartment door courtesy switch ON (door opened).Below 1 WDSWL e E (T13-4 e T7-4)LG e W-BLuggage compartment door courtesy switch OFF (door closed).1 MW or higher
L1E (T13 5T7 4)RWWBDoor lock control switch ºlockº position.Below 1 WL1 e E (T13-5 e T7-4)R-W e W-BDoor lock control switch OFF or ºunlockº position.1 MW or higher
UL3E (T13 6T7 4)GWBDoor key lock and unlock switch ºunlockº position.Below 1WUL3 e E (T13-6 e T7-4)G e W-BDoor key lock and unlock switch OFF or ºlockº position.1MW or higher
DSWDE (T13 7T7 4)RBWBDoor open detection switch (driver's) ON (door opened).Below 1WDSWD e E (T13-7 e T7-4)R-B e W-BDoor open detection switch (driver's) OFF (door closed).1MW or higher
UL1E (T13 8T7 4)GRWBDoor lock control switch ºunlockº position.Below 1WUL1 e E (T13-8 e T7-4)G-R e W-BDoor lock control switch OFF or ºlockº position.1MW or higher
LUGE (T13 9T7 4)LWBLuggage compartment door key lock and unlock switch ON.Below 1WLUG e E (T13-9 e T7-4)L e W-BLuggage compartment door key lock and unlock switch OFF.1MW or higher
HEAD e E (T13-10eT7-4)R-Y e W-BLight control switch other than ºHEADº position.10 - 14 V
SH e E (T13-11 eT7-4)P-B e W-BAlways.10 - 14 V
IND e Ground
(T13-12 e Ground)W-L e GroundAlways.Below 270 W
DSWHE (T13 14T7 4)GRWBEngine hood courtesy switch ON (hood opened).Below 1WDSWH e E (T13-14 e T7-4)G-R e W-BEngine hood courtesy switch OFF (hood closed).1MW or higher
LSWDE (T13 15T7 4)LWWBDoor unlock detection switch ON (door opened).Below 1WLSWD e E (T13-15 e T7-4)L-W e W-BDoor unlock detection switch OFF (door closed).1MW or higher
UL2E (T13 16T7 4)WWBDoor key lock and unlock switch ºunlockº position.Below 1WUL2 e E (T13-16 e T7-4)W e W-BDoor key lock and unlock switch OFF or ºlockº position.1MW or higher
DSWPE (T13 19T7 4)RLWBDoor open detection switch (passenger's) ON (door opened).Below 1WDSWP e E (T13-19 e T7-4)R-L e W-BDoor open detection switch (passenger's) OFF (door closed).1MW or higher
KSWE (T13 20T7 4)YWBKey unlock warning switch ON.Below 1WKSW e E (T13-20 e T7-4)Y e W-BKey unlock warning switch OFF.1MW or higher

DI4X0-01
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-615
843 Author
: Date
:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
Proceed to the reference page shown in the matrix chart below for each malfunction symptom and trouble-
shoot for each circuit.
HINT:
Troubleshooting of the theft deterrent system is based on the premise that the door lock control system is
operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that
the door lock control system is operating normally.
Theft Deterrent System:
Details of ProblemInspecting Circuit *1See page
1. Indicator light circuitDI-617
2. Luggage compartment door key lock and unlock switch
circuitDI-633
The theft deterrent system cannot be set3. Luggage compartment door courtesy switch circuitDI-636
4. Door courtesy switch circuitDI-640
5. Engine hood courtesy switch circuitDI-642
The indicator light does not blink when system is setIndicator light circuitDI-617

When the system is set

When the back door is opened by a method other than the key

The system does not operate
Luggage compartment door courtesy switch circuitDI-636

When the system is set

When the engine hood is opened

The system does not operate
Engine hood courtesy switch circuitDI-642

While the system is in warning operation

Horns do not soundHorn relay circuitDI-621

While the system is in warning operation

Theft deterrent horn does not soundTheft deterrent horn circuitDI-623

While the system is in warning operation

Headlights do not flashHeadlight control relay circuitDI-626

While the system is in warning operation

Taillights do not flashTaillight control relay circuitDI-628

While the system is in warning operation

The starter cut is not cut offStarter relay circuitDI-619

When the system is set

It is not canceled when the ignition key is turned to ACC or ON
position
Ignition switch circuitDI-630

When the system is set

It still operates when the back door is opened with the keyLuggage compartment door key lock and unlock switch
circuitDI-633
System is still set even when a rear door is openDoor courtesy switch circuitDI-640

Even when the system is not set

Horns soundHorn relay circuitDI-621

Even when the system is not set

Theft deterrent horn soundsTheft deterrent horn circuitDI-623

Even when the system is not set

Headlights stay onHeadlight control relay circuitDI-626

Even when the system is not set

Taillights stay onTaillight control relay circuitDI-628
*1:
If numbers are given to the circuit proceed with troubleshooting in the order indicated by those numbers.