1997 TOYOTA SUPRA airbag off

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 drop
Battery

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 circuit
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
14
(DI-582)

Open in D squib circuit
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
31
(DI-586)
Airbag sensor assembly malfunction
Airbag sensor assemblyON
53
(DI-588)
Short in P squib circuit
Front passenger airbag assembly (P squib)

Airbag sensor assembly

Wire harness
ON
54
(DI-592)
Open in P squib circuit
Front 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.

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

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.

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

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.

1
234
3 SUPRA(
Cont. next page)
2ACC
IG1
ST2IG2 AM1 4
8 6 7AM2
2 1
5 3 5
2 1
2
2 1J 4
22 2 2
224 EA18 EA15EA2
11 IC2 12 IC2
2BP15 4
M 6BP1 9IJ1
4IB1
4IJ1
5IJ1 IC 210
IF17
EA22 1B 4
22 2 2
ED IG 1 2
1 2
1 2
1 2
1 2
1 2
Ri ght kick
p anel Rear side of
int ake manifold
12 0A ALT30A EFI NO. 2
30A AM2
50A AM1(
USA)
60A AM1(
Canada)
15 II113 II1 13 IJ2 1J 51J31J6
1E 12
IJ118
ED Re a r s i de of
intake manif old
10A GAUGE7. 5A IGN7. 5 A ST
B- W
B- RL
W- B
B- RO LG- RR LG- B
L- B
BRL- B
B- R W- B8562
16 23 16
12 1
10 134 14
8
3
G
V- W
LW-BV- WGY
B- R
L- RG
V- W
L
B- R B- R
B- W
B- Y
GR
B- R
B- Y
B- Y
B- Y
L
W- R W- R
W
WB- YB- W B- W B- R
B- O
B- WW- B
3EFI NO. 2 RELAYEFI MAIN RELAY
(
Sh ort Pin) EFPCDIFP
TS
WB
F14
FUEL P UMP
D 5
DATA LI NK
CONN EC TO R 2
D 1
DATA LINK
CONN ECTOR 1T o AB S So le n o i d
Relay< 1 9- 2>
ABA/D OPA TC AB S
Fr om Engine
Con tr ol Module
<15- 5>F rom Cr uis e
Contro l ECU
< 17- 2> From Tra ck Off
Indicato r L igh t
[Telltale Light LH]
<20->1>
W
E1 I1 9
IG NI TI O N SW
F1 5
FU EL PU MP ECU+B
234872
1
L BRR G B- YWR-B
R
R- W
R- G
R- Y
R- L
W- B
W- B
W- B
B#10 #20 #30 #40 #50SDL
S 1
S FI RESI STORI12
INJECTOR NO. 1 I13
INJECTOR NO. 2 I14
INJECTOR NO. 3 I15
INJECTOR NO. 4 I16
INJECTOR NO. 5 I17
INJECTOR NO. 6
BA TTERY+B3 2
BR BR
BR L- B B- O
BT 5
MAL FU NCTION
INDI CA TO R LAMP

3 TE 1 BAT
G R- L R- Y R- G R- WR R- B
B- R V- WG L- BBR
BR L- B
BR
From AB S E CU
< 19- 2>
E1 1
1 111 2
222 21E 81K4 14 IC2
2A 1
P- B11TC
From AB S E CU
< 19- 2>
B- RY
B- W
2 2W
Engine Control(
2JZ- GTE)
Power Source
A
B
C
D
E
G
I
K
M
O
Q
S H
J
L
N
P
R 22
LWA
30A EFI NO. 1
I 7. 5A OBD- I
B- W
14 1C
BILef t quar ter pillar Fr ont si de of
left fenderEB IB1 5
B- W
Left kick
pa nel IEB- R V- WG W- BG
W- B
BR W- B
BR
IJ1 12
6 #605SG
4CG
8 5
AB D1 7
DA TA LINK
CO NNEC TOR 3
From Ai rba g
Sen sor Assembly
<13- 3>
9
ECT
+B 12 B
B- YVF
BRBRL B- O B- W(
A/T) B- R
B- Y
GR
B- W
* En gine Con tro l Mo du le For the connectors of the parts lis ted below. see the next page.
B- Y B- WB- R
B- R
To Throttle ECU
<20- 3>
From Airbag Sensor
Assembly <13-3>
From ABS ECU
<19-2>
From Throttle ECU
<20-2>
From Cruise
Control ECU
<17-1>
From ABS ECU
<19-2>
From ABS ECU <19-2>
From Throttle ECU
<20-2>
From Cruise Control
ECU <17-2>
From Airbag Sensor
Assembly <13-3>
K OVERALL ELECTRICAL WIRING DIAGRAM

RS0OL-01
AB0250Spiral Cable
R06853
RS-2
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
1941 Author
: Date
:
1997 SUPRA (RM502U)
OPERATION
1. STEERING WHEEL PAD (with AIRBAG)
The inflater and bag of the SRS are stored in the steering wheel
pad and cannot be disassembled. The inflater contains a squib,
igniter charge, gas generant, etc., and inflates the bag when
instructed by the airbag sensor assembly.
2. SPIRAL CABLE (in COMBINATION SWITCH)
A spiral cable is used as an electrical joint from the vehicle body
side to the steering wheel.
3. FRONT PASSENGER AIRBAG ASSEMBLY
The inflater and bag of the SRS are stored in the front passen-
ger airbag assembly and cannot be disassembled. The inflater
contains a squib, igniter charge and gas generant, etc., and in-
flates the bag when instructed by the airbag sensor assembly.
4. SRS WARNING LIGHT
The SRS warning light is located on the combination meter. It
goes on to alert the driver of trouble in the system when a mal-
function is detected in the airbag sensor assembly. In normal
operation conditions when the ignition switch is turned to the
ACC or ON position, the light goes on for about 6 seconds and
then goes off.
5. AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
lower center finish panel. The airbag sensor assembly consists
of an airbag sensor, safing sensor, diagnosis circuit and ignition
control, drive circuit, etc. It receives signals from the airbag sen-
sor and judges whether the SRS must be activated or not.