Air Bag Indicator Circuit Malfunction (Driver)
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Air Bag Indicator Circuit Malfunction (Driver)
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Circuit/System Description
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When the ignition is turned ON, during the bulb check, the driver air bag indicator will flash, and then turn OFF after the bulb check. The inflatable restraint sensing and diagnostic module (SDM) performs diagnostic tests on the SIR system during the bulb check. If any malfunction exists the SDM will request the instrument cluster to illuminate the air bag indicator steady, via serial data. If a preexisting malfunction exists, the air bag indicator will illuminate steady immediately after the ignition is turned ON. If the ignition 1 voltage is outside of the normal operating voltage range of 9-16 V, the SDM will command the instrument cluster to illuminate the air bag indicator ON, even with no DTCs present, and then disable all deployment loops.
A DTC B1370 may set if the ignition 1 circuit is outside the 9-16 V range.
Schematic Reference
SIR Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
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1.
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Verify SDM DTCs are not set.
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3.
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With a scan tool command the Instrument Cluster to turn all instrument cluster indicators ON and OFF. The air bag indicators should turn ON and OFF as commanded.
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4.
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If the air bag indicator does not turn ON and OFF as expected, replace the P16 instrument cluster.
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5.
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If all circuits test normal, replace the K36 SDM.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
