Lexus SC300 / Lexus SC400. Manual — part 794
DIAGNOSTIC CHART
DIAGNOSTIC CHART
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
RS–71
WIRING DIAGRAM
DIAGNOSTIC CHART (Cont’d)
DIAGNOSTIC CHART (Cont’d)
(See page
RS–72
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
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 front airbag sensor circuit. (Measure resistance between terminals +SR and –SR, +SL
and –SL of center airbag sensor assembly connector.)
C
OK
P
Disconnect center airbag sensor assembly connector.
Measure resistance between terminals +SR and –SR,
+SL and –SL of harness side connector o center airbag
sensor assembly.
Resistance:
755
– 885
Go to step
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
RS–73
OK
NG
OK
NG
3
Check front airbag sensor circuit. (Measure resistance between terminals +SR and +SL of cen-
ter airbag sensor assembly connector and body ground.)
C
OK
Measure resistance between terminals +SR, +SL of
harness side connector of center airbag sensor assem-
bly and body ground.
Resistance:
1 M
or higher
Repair or replace harness or connector between center
airbag sensor assembly and front airbag sensor (See
page
).
4
Check D squib circuit.
C
OK
For the connector (on the spiral cable side) between the
spiral cable and steering wheel pad, measure the resist-
ance between D+, D– and body ground.
Resistance:
1 M
or higher
Go to step
RS–74
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
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