Lexus SC300 / Lexus SC400. Manual — part 799
RELEASE METHOD OF AIRBAG ACTIVATION PREVENTION
MECHANISM
An airbag activation prevention mechanism is built into the connector for the squib circuit of the supplemen-
tal restraint system. When release of the airbag activation prevention mechanism is directed in the trouble-
shooting procedure, as shown in the illustration of the connectors 1 and 2 below, insert paper which is the
same thickness as the male terminal, between the terminal and the short spring.
CAUTION:
NEVER RELEASE the airbag activation prevention mechanism on the steering wheel pad connector.
NOTICE:
Do not release the airbag activation prevention mechanism unless specifically directed by the
troubleshooting procedure.
If the paper inserted is too thick the terminal and short spring may be damaged, so always use paper the
same thickness as the male terminal.
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
RS–91
DTC
14
Open in D Squib Circuit
CIRCUIT DESCRIPTION
The squib circuit consists of the center airbag sensor assembly, spiral cable and the steering wheel pad (squib).
It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page
trouble code 14 is recorded when an open is detected in the squib circuit.
DTC No.
Diagnosis
14
Open circuit in D+ wire harness or D– wire harness of squib.
Squib malfunction.
Spiral cable malfunction.
Center airbag sensor assembly malfunction.
RS–92
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
WIRING DIAGRAM
DIAGNOSTIC CHART
DIAGNOSTIC CHART
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
RS–93
NG
OK
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
P
Disconnect center airbag sensor assembly connector.
Measure resistance between D+ and D– on spiral cable
side of connector between spiral cable and steering
wheel pad.
Resistance:
Below 1
Go to Step
.
RS–94
–
SUPPLEMENTAL RESTRAINT SYSTEM
TROUBLESHOOTING
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