1995 TOYOTA SUPRA ignition

Check center airbag sensor assembly.
(1) Connect connector to center airbag sensor as±
sembly.
(2) Using a service wire, connect D
± and D± on spiral
cable side of connector between spiral cable and
steering wheel pad.
(3) Using a service wire, connect P
+ and P± on cen±
ter airbag sensor assembly side of connector
between center airbag sensor assembly and
front passenger airbag assembly.
(4) Connect negative(±) terminal cable to battery,
and wait at least 2 seconds.
(1) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(2) Clear malfunction code stored in memory
(See page RS±47)
(3) Turn ignition switch to LOCK, and wait at least
20 seconds.
(4) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(5) Using SST, connect terminals Tc and E
1 of
DLC1 or DLC2.
SST 09843±18020
(6) Check diagnostic trouble code.
Diagnostic trouble code 11 is not output.
Codes other than code 11 may be output at this time,
but they are not relevant to this check.
Replace center airbag sensor assembly.
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±57

Check D squib.
(1) Turn ignition switch to LOCK.
(2) Disconnect negative (±) terminal cable from the
battery, and wait at least 90 seconds.
(3) Connect steering wheel pad connector.
(4) Connect negative(±) terminal cable to battery,
and wait at least 2 seconds.
(1) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(2) Clear malfunction code stored in memory.
(See page RS±47)
(3) Turn ignition switch to LOCK, and wait at least
20 seconds.
(4) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(5) Using SST, connect terminals Tc and E
1 of
DLC1 or DLC2.
SST 09843±18020
(6) Check diagnostic trouble code.
Diagnostic trouble code 11 is not output.
Codes other than code 11 may be output at this time,
but they are not relevant to this check.
Check P squib.
Replace steering wheel pad.
Replace front passenger airbag assembly.
(1) Turn ignition switch to LOCK.
(2) Disconnect negative (±) terminal cable from the
battery, and wait at least 90 seconds.
(3) Connect front passenger airbag assembly
connector.
(4) Connect negative(±) terminal cable to battery,
and wait at least 2 seconds.
(1) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(2) Clear malfunction code stored in memory.
(See page RS±47)
(3) Turn ignition switch to LOCK, and wait at least
20 seconds.
(4) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(5) Using SST, connect terminals Tc and E1 of
DLC1 or DLC2.
SST 09843±18020
(6) Check diagnostic trouble code.
Diagnostic trouble code 11 is not output.
Codes other than code 11 may be output at this
time, but they are not relevant to this check. RS±58
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

Preparation.
Disconnect center airbag sensor assembly connec-
tor.
Measure resistance between terminals +SR and
±SR, +SL and ±SL of harness side connector of
center airbag sensor assembly.
Resistance: 755
Ð 855

Repair or replace harness or connector between
center airbag sensor assembly and front airbag
sensor (See page RS±36).
Check front airbag sensor circuit. (Measure resistance between terminals
+SR and ±SR, +SL and ±SL of center airbag sensor assembly connector.)
Check front airbag sensor circuit. (Measure resistance between terminals
+SR or +SL of center airbag sensor assembly connector and body ground.)
(1) Disconnect negative (±) terminal cable from the
battery, and wait at least 90 seconds.
(2) Remove steering wheel pad (See page RS±10).
(3) Disconnect connector of front passenger airbag
assembly (See page RS±20).
Store the steering wheel pad with the front surface
facing upward.
Go to code 15.
(1) Connect negative (±) terminal cable to battery.
(2) Turn ignition switch ON.
Measure voltage between terminals +SR or +SL of
harness side connector of center airbag sensor as-
sembly and body ground.
Voltage: 0 Ð 0.1 V
INSPECTION PROCEDURES [P] Preparation [C] Check
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±61

Check center airbag sensor assembly.
(1) Turn ignition switch to LOCK.
(2) Disconnect negative (±) terminal cable from the
battery.
(3) Connect connector to center airbag sensor as±
sembly.
(4) Using a service wire, connect P+ and P± on
center airbag sensor assembly side of connec±
tor between center airbag sensor assembly and
from passenger airbag assembly.
(5) Using a service wire, connect P+ and P± on
center airbag sensor assembly side of connec±
tor between center airbag sensor assembly and
front passenger airbag assembly.
(6) Connect negative (±) terminal cable to battery,
and wait at least 2 seconds.
(1) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(2) Clear malfunction code stored in memory.
(See page RS±47)
(3) Turn ignition switch to LOCK, and wait at least
20 seconds.
(4) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(5) Using SST, connect terminals Tc and E
1 of
DLC1 or DLC2.
SST 09843±18020
(6) Check diagnostic trouble code.
Diagnostic trouble code 12 is not output.
Codes other than code 12 may be output at this
time, but they are not relevant to this check.
Replace center airbag sensor assembly.
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±63

Check D squib.
(1) Turn ignition switch to LOCK.
(2) Disconnect negative (±) terminal cable from the
battery, and wait at least 90 seconds.
(3) Connect steering wheel pad connector.
(4) Connect negative (±) terminal cable to battery,
and wait at least 2 seconds.
(1) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(2) Clear malfunction code stored in memory.
(See page RS±47)
(3) Turn ignition switch to LOCK, and wait at least
20 seconds.
(4) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(5) Using SST, connect terminals Tc and E
1 of
DLC1 or DLC2.
SST 09843±18020
(6) Check diagnostic trouble code.
Diagnostic trouble code 12 is not output.
Codes other than code 12 may be output at this
time, but they are not relevant to this check.
Check D squib.
(1) Turn ignition switch to LOCK.
(2) Disconnect negative (±) terminal cable from the
battery, and wait at least 90 seconds.
(3) Connect front passenger airbag assembly con±
nectar.
(4) Connect negative (±) terminal cable to battery,
and wait at least 2 seconds.
(1) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(2) Clear malfunction code stored in memory.
(See page RS±47)
(3) Turn ignition switch to LOCK, and wait at least
20 seconds.
(4) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(5) Using SST, connect terminals Tc and E
1 of
DLC1 or DLC2.
SST 09843±18020
(6) Check diagnostic trouble code.
Diagnostic trouble code 12 is not output.
Codes other than code 12 may be output at this
time, but they are not relevant to this check.
Replace steering wheel pad.
Replace front passenger airbag assembly. RS±64
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

 
 
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.
Check spiral cable.
Repair or replace spiral cable.
Repair or replace harness or connector between
center airbag sensor assembly and spiral cable.
(1) Turn ignition switch to LOCK.
(2) Disconnect connector between center airbag
sensor assembly and spiral cable.
(3) Turn ignition switch ON.
Measure voltage at D
+ on spiral cable side of connec-
tor between spiral cable and steering wheel pad.
Voltage: 0 V
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±65

Check center airbag sensor assembly.
(1) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(2) Clear malfunction code stored in memory. (See
page RS±47)
(3) Turn ignition switch to LOCK, and wait at least
20 seconds.
(4) Remove the service wire which connects D
+ and
D± on spiral cable side of connector between
spiral cable and steering wheel pad.
(5) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(6) Using SST, connect terminals Tc and E
1 of DLC1
or DLC2.
SST 09843±18020
(7) Check diagnostic trouble code.
Diagnostic trouble code 13 is not output.
Codes other than code 13 may be output at this
time, but they are not relevant to this check.
Replace center airbag sensor assembly.
(1) Using a service wire, connect D+ and D± on spiral
cable side of connector between spiral cable and
steering wheel pad.
(2) Using a service wire, connect P+ and P± on cen±
ter airbag sensor assembly side of connector
between center airbag sensor assembly and
front passenger airbag assembly.
(3) Connect negative (±) terminal cable to battery, and
wait at least 2 seconds. RS±68
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

(1) Turn ignition switch to LOCK, and wait at
least 20 seconds.
(2) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(3) Clear malfunction code stored in memory. (See
page RS±47)
(4) Turn ignition switch to LOCK, and wait at least
20 seconds.
(5) Turn ignition switch to ACC or ON, and wait at
least 20 seconds.
(6) Using SST, connect terminals Tc and E
1 of DLC1
or DLC2.
SST 09843±18020
(7) Check diagnostic trouble code.
Diagnostic trouble code 13 is not output.
Codes other than code 13 may be output at this
time, but they are not relevant to this check.
Replace steering wheel pad.
Check D squib.
(1) Turn ignition switch to LOCK.
(2) Disconnect negative (±) terminal cable
from the battery, and wait at least 90 sec±
onds.
(3) Connect steering wheel pad connector.
(4) Using a service wire, connect P
+ and P±.
(5) Connect negative (±) terminal cable to battery,
and wait at least 2 seconds.
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.
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±69