AIR BAG Indicator Does Not Come ON

AIR BAG INDICATOR DOES NOT COME ON

CIRCUIT DESCRIPTION
The ignition switch supplies battery voltage to the AIR BAG indicator using the F13 fuse. The AIR BAG indicator is controlled by the sensing and diagnostic module (SDM) via universal asynchronous receiver transmitter (UART) data. When the ignition switch is first turned to the ON position, the SDM responds by illuminating the AIR BAG indicator for approximately 6 seconds while performing diagnostic tests on the SIR system.

DIAGNOSTIC AIDS
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.

The following are possible causes of the malfunction:
- An instrument cluster malfunction
- An internal SDM malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections.

TEST DESCRIPTION

Steps 1-5:

The number below refers to the step number on the diagnostic table.
3. This step tests for a SDM malfunction