Page 827 of 1807
BE6653F03395F03396
ON
E01
DI-536
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
764 Author: Date:
1997 SUPRA (RM502U)
2 Check for open and short in harness and connector between terminal +B of
throttle control ECU and throttle control relay (See page IN-28).
NG Repair or replace harness or connector.
OK
3 Check voltage between terminals +B and E01 of throttle control ECU connector.
PREPARATION:
(a) Remove throttle control ECU with connectors still con-
nected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals +B and E01 of throttle con-
trol ECU connector.
OK:
Voltage: 9 - 14 V
OK Check and replace throttle control ECU.
NG
Page 886 of 1807
W00786
Relay Block No.2 Junction Block No.1Airbag Sensor
Assembly
2
21B 1J1J
1J1G 1G6
10 3 8
3
G 4
4
W ALT
AM2
Battery IB1 4
Ignition SwitchJunction Block No.1ACC 16
15
AM16 B-W
72
W-RG-R
B-O
IG2 W
22
2A
Relay Block No.2
W
B
1W-RCIG
IGN
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-595
823 Author: Date:
1997 SUPRA (RM502U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter)functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different to other circuits-when the SRS warning
light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.DTC Detecting ConditionTrouble Area
NormalSource voltage drop.Battery
Airbag sensor assembly
WIRING DIAGRAM
DI4WR-01
Page 889 of 1807
W03534
21E 1G
1E1G II1
IF1
IF1
II1
1E 1B3
7
9
4
2
131211 21
2
Battery
1B
5 11 DLC1
Relay Block No.2
ALT
Power
Power
Airbag Sensor
Assembly
Junction Block No.1
Junction Block No.1
SRS Waring Light215
Junction Block No.1
*1: 2JZ-GE Engine
*2: 2JZ-GTE Engine ECU-BTc
ABB (*1)
(*2) B-Y
LA 12
W-RP-B R (*1)
(*2)
P-B
P-B
2
2A2P-B
7
Tc
W-L
ABTc DLC2
R
4
12B-Y
B B
B
B DI-598
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
826 Author: Date:
1997 SUPRA (RM502U)
SRS Warning Light System Malfunction (Always lit up, when igni-
tion switch is in LOCK position.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E
1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
DI4WS-01
Page 903 of 1807
DI4WY-01
I02535
Theft Deterrent Horn
R/B No.2
Headlight Relay
Horn Relay
Starter Relay
Engine Hood Courtesy
Switch
HornTheft Deterrent Horn
(2JZ-GTE)
(2JZ-GE)
Theft Deterrent and Door
Lock ECU
Door Key Lock and Unlock
Switch
Door Lock Control Switch
Door Lock Motor and Door Unlock
Detection Switch
Door Courtesy SwitchLuggage Room Light Switch Door Key Lock and Unlock
Switch Door Lock Control Switch
Back Door Key Unlock Switch
(Power Window Master Switch)
DI-612
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
840 Author: Date:
1997 SUPRA (RM502U)
PARTS LOCATION
Page 906 of 1807
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.
Page 910 of 1807
N19900
1K
1J
IJ2P2P2
C9C9IJ1
EA122
2IB2IF2
I19I19IB1
2
2A
S2S3 4
6
87 B1365
1223
1
2
3510Theft Deterrent and
Door Lock ECU
EA2
EA3
4Starter Relay MAINL-OSRLY
25
Clutch Start Switch(M/T)
21AM2 J/B No.1 STR/B No.2
2
1
2JZ-GTE
2JZ-GE
Battery1
2 B
BL-O
L-O B-WB-WW-R
W-R W-B
B
B B 1 Ignition
SwitchT13
Park/Neutral Start Switch
1
1 B
(A/T)
12
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-619
847 Author: Date:
1997 SUPRA (RM502U)
Starter Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact ºaº in the ECU becomes open, creating an open circuit
in terminal ST circuit and making the starter inoperative (starter cut).
In this condition, if one of the following operations is done, the contact ºaº in the ECU is grounded, thus can-
celing the starter cut:
(1) The front LH and RH door is unlocked with a key.
WIRING DIAGRAM
DI4X2-01
Page 912 of 1807
I02710
I02710
Theft Deterrent and
Door Lock ECU R/B No.2
HORN Relay
R/B No2.Horn Switch
HornL-R
L-B HAZ-HORN
BatteryHORN
L-BL-R
L-R W
22
2 2
2
2A 11
1116
14
L-R
L-B 3IB2IF2
24
BT13
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-621
849 Author: Date:
1997 SUPRA (RM502U)
Horn Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off in approximately
0.2 sec. cycles. This switches the horn relay on and off, thus the horn blow (See the wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the horn relay
switches off, thus the horns stop blowing:
(1) The front LH or RH door is unlocked with a key.
(2) The ignition switch is turned to the ACC or ON position.
(3) Approximately 1 minute elapses.
WIRING DIAGRAM
DI4X3-01
Page 913 of 1807
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).
