Lexus SC300 / Lexus SC400. Manual — part 798
OK
NG
INSPECTION PROCEDURE
1
Preparation.
P
1.
Disconnect battery negative (–) terminal cable, and
wait at least 90 seconds.
2.
Remove steering wheel pad (See page
3.
Disconnect connectors of front passenger airbag
assembly (See page
Caution:
Store the steering wheel pad with the
surface facing upward.
2
Check D squib circuit.
C
OK
Measure resistance between D
+
and D– on spiral cable
side of connector between spiral cable and steering
wheel pad.
Resistance:
1 k
or higher
Go to step
.
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
RS–87
OK
NG
OK
NG
3
Check center airbag sensor assembly.
C
OK
Hint
P
1.
Using a service wire, connect D
+
and D–.
2.
Using a service wire, connect P
+
and P–.
3.
Connect negative (–) terminal cable to battery.
4.
Clear malfunction.
5.
Turn ignition switch LOCK, and wait at least 20 sec-
onds.
6.
Disconnect service wire of D
+
and D–.
7.
Turn ignition switch ACC or ON, and wait at least 20
seconds.
1.
Turn ignition switch LOCK, and wait at least 20 sec-
onds.
2.
Turn ignition switch ACC or ON, and wait at least 20
seconds.
3.
Using SST, connect terminals Tc and E
1
of DLC2.
SST 09842–18020
4.
Check diagnostic trouble code.
Diagnostic trouble code 13 is not output.
Codes other than code 13 may be output at this time, but
this is not relevant to this check.
Replace center airbag sensor assembly.
4
Check D squib.
C
OK
Hint
P
1.
Turn ignition switch LOCK.
2.
Disconnect battery negative (–) terminal cable, and
wait at least 90 seconds.
3.
Connect steering wheel pad (squib) connector.
4.
Connect negative (–) terminal cable to battery.
5.
Clear malfunction.
1.
Turn ignition switch LOCK, and wait at least 20 sec-
onds.
2.
Turn ignition switch ACC or ON, and wait at least 20
seconds.
3.
Using SST, connect terminals Tc and E
1
of DLC2.
SST 09843–18020
4.
Check diagnostic trouble code.
Diagnostic trouble code 13 is not output.
Codes other than code 13 may be output at this time, but
this is not relevant to this check.
Replace steering wheel pad.
RS–88
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
OK
NG
OK
NG
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.
5
Check spiral cable.
C
OK
P
1.
Disconnect connector between center airbag sen-
sor assembly and spiral cable.
2.
Release airbag activation prevention mechanism
on center airbag sensor assembly side of spiral
cable connector (See page
).
Measure resistance between D
+
and D– on spiral cable
side of connector between spiral cable and steering
wheel pad.
Resistance:
1 M
or higher
Repair or replace spiral cable.
6
Check harness between center airbag sensor assembly and spiral cable.
C
OK
P
1.
Disconnect center airbag sensor assembly con-
nector.
2.
Release airbag activation prevention mechanism
on center airbag sensor assembly connector (See
page
Measure resistance between D
+
and D
–
on center air-
bag sensor assembly side of connector between center
airbag sensor assembly and spiral cable.
Resistance:
1 M
or higher.
Repair or replace harness or connector between center
airbag sensor assembly and spiral cable.
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
RS–89
OK
NG
7
Check center airbag sensor assembly.
C
OK
P
Connect center airbag sensor assembly connector.
Measure resistance between D
+
and D– on center air-
bag sensor assembly side of connector between center
airbag sensor assembly and spiral cable.
Resistance:
1 k
or more
Replace center airbag sensor assembly.
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.
RS–90
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
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