Page 851 of 1807
DI4WG-01
DI-560
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
788 Author: Date:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
(N l)System normal-OFF(Normal)
(DI-595)Source voltage dropBattery
Airbag sensor assemblyON
11
(DI-564)
Short in squib circuit (to ground)Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
12
(DI-571)
Short in squib circuit (to B+)Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
13
(DI-577)
Short in D squib circuitSteering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
14
(DI-582)
Open in D squib circuitSteering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
31
(DI-586)Airbag sensor assembly malfunctionAirbag sensor assemblyON
53
(DI-588)Short in P squib circuitFront passenger airbag assembly (P squib)
Airbag sensor assembly
Wire harness
ON
54
(DI-592)Open in P squib circuitFront passenger airbag assembly (P squib)
Airbag sensor assembly
Wire harness
ON
HINT:
When the SRS warning light remains lit up and the DTC is the normal code, this means a source voltage
drop.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, after approx. 10 seconds the SRS warning light will automatically go out.
When 2 or more codes are indicated, the codes will be displayed in numeral order starting from the
lowest numbered code.
If a code not listed on the chart is displayed, the airbag sensor assembly is faulty.
Page 853 of 1807
DI4WI-01
W02759
65 43
10921
7 8 BA
DI-562
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
790 Author: Date:
1997 SUPRA (RM502U)
TERMINALS OF ECM
No.SymbolTerminal Name
A-Electrical Connection Check Mechanism
B-Electrical Connection Check Mechanism
1P-Squib (Passenger)
2P+Squib (Passenger)
3LASRS Warning Light
4D-Squib (Driver)
5D+Squib (Driver)
6TcDiagnosis
7E2Ground
8E1Ground
9IG2Power Source (IGN Fuse)
10ACCPower Source (CIG Fuse)
Page 854 of 1807
DI4WJ-01
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-563
791 Author: Date:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
Problem SymptomInspection ItemPage
WIth the ignition switch at ACC or ON, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed.
SRS warning light lights up even when ignition switch is in the
LOCK position.
SRS warning light system malfunction (Always lit up when
ignition switch is in LOCK position.)DI-598
WIth the ignition switch at ACC or ON, the SRS warning light
does not light up.SRS warning light system malfunction (Does not light up
when ignition switch is turned to ACC or ON.)DI-600
DTC not displayed.
SRS warning light is always lit up with a DTC check procedure.
DTC displayed without Tc and E
1 terminal connection.
Tc terminal circuitDI-603
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 888 of 1807
AB0119AB0234H07975
ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-597
825 Author: Date:
1997 SUPRA (RM502U)
3 Does SRS warning light turn off ?
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Connect the steering wheel pad connector.
(c) Connect the front passenger airbag assembly connector.
(d) Connect the airbag sensor assembly connector.
(e) Turn the ignition switch ON.
CHECK:
Operate electric system checked in (defogger, wiper, headlight,
heater blower, etc.) and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, trouble-
shooting for the DTC. If a normal code is output,
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.
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 890 of 1807
AB0117R05902
H07976
LOCK
P squib
Spiral
CableAirbag Sensor
Assembly
D squib
AB0117
W02765H00044
LOCK
Airbag Sensor Assembly
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-599
827 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
1 Preparation.
PREPARATION:
(a) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(b) Remove the steering wheel pad (See SR Section).
(c) Disconnect the connector of front passenger airbag as-
sembly (See page RS-21).
CAUTION:
Store the steering wheel pad with the front surface facing
upward.
2 Does SRS warning light turn off?
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c) Disconnect the airbag sensor assembly connector.
(d) Connect negative (-) terminal cable to battery.
CHECK:
Check operation of SRS warning light.
NG Check SRS warning light circuit or terminal AB
circuit of DLC1.
OK
Replace airbag sensor assembly.
Page 891 of 1807
N14677
Fuse
(+) (-)
DI-600
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
828 Author: Date:
1997 SUPRA (RM502U)
SRS Warning Light System Malfunction (Does not light up, when
ignition switch is in turned to ACC or ON.)
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
Refer to page DI-598 for the WIRING DIAGRAM.
INSPECTION PROCEDURES
1 Check ECU-B Fuse.
PREPARATION:
Remove the ECU-B fuse.
CHECK:
Check the continuity of ECU-B fuse.
OK:
Continuity
HINT:
Fuse may be burnt out even if it appears to be OK during
visual inspection.
If fuse is OK, install it.
NG Go to step 5.
OK
2 Preparation (See step 1 on page DI-595).
DI4WT-01
