RESTRAINT CONTROL SYSTEM
9J1–9
Chart A SDM Integrity Check
D09RX002
Circuit Description:
When the Sensing and Diagnostic Module (SDM)
recognizes “ignition 1" voltage, applied to terminals “12",
is greater than 9 volts, the “AIR BAG" warning lamp is
flashed 7 times to verify operation. At this time the
SDM performs “Turn–ON" tests followed by “Continuous
Monitoring" tests. When a malfunction is detected, the
SDM sets a current diagnostic trouble code and
illuminates the “AIR BAG" warning lamp. The SDM will
clear current diagnostic trouble codes and move them to
a history file when the malfunction is no longer detected
and/or the ignition switch is cycled, except for
Diagnostic Trouble Codes (DTCs) 51, 53 and 71. DTC
71 can only be cleared using a scan tool “Clear Codes"
command in case that the malfunction on DTC 71 has
been solved and no DTCs 51 and 53 were remained.
DTCs 51, 53 and 71 can not be cleared after a “Clear
Codes" command is issued.
Chart Test Description:
Number(s) below refer to step number(s) on the
diagnostic chart:
1. This test confirms a current malfunction. If no current
malfunction is occurring (history DTC set) the
“Diagnostic Aids" for the appropriate diagnostic
trouble code should be referenced. The SDM should
not be replaced for a history diagnostic trouble code.
2. This test checks for a malfunction introduced into the
SRS during the diagnostic process. It is extremely
unlikely that a malfunctioning SDM would cause a
new malfunction to occur during the diagnostic
process.
3. When all circuitry outside the SDM has been found to
operate properly, as indicated by the appropriate
diagnostic chart, then and only then should the SDM
be replaced.