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
Page 892 of 1807

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.
Page 893 of 1807
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.
Page 894 of 1807
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
Page 895 of 1807
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
Page 896 of 1807
AB0118
R14304AB0119
H00031
ACC
ON
or
(-)DLC 1
(+)Tc
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-605
833 Author: Date:
1997 SUPRA (RM502U)
3 Check voltage between terminal Tc of DLC1 and body ground.
CHECK:
Measure the voltage between terminals Tc of DLC1 and body
ground.
OK:
Voltage: 10 - 14 V
OK Check harness between terminal E
1 of DLC1
and body ground.
NG