Chart C Warning Lamp Comes "ON" Steady

CIRCUIT DESCRIPTION
When the ignition switch is first turned "ON," system voltage is applied from the GAUGES fuse to "SIR Indicator High," terminal "B9," and to the "AIR BAG" warning lamp which is connected to "SIR Indicator Low" terminal "A1." The AIR BAG fuse applies system voltage to the "Ignition 1" inputs, terminals "A3" and "B3." The DERM responds by flashing the "AIR BAG" warning lamp 7 to 9 times.

When the engine is being cranked, system voltage is applied from the RLC Fuse to the DERM at the "Crank" input. The DERM responds by grounding the "SIR Indicator Low" output until system voltage is removed from the "Crank" input. This results in the "AIR BAG" warning lamp being "ON" during cranking.

After cranking, the DERM will again flash the "AIR BAG" warning lamp 7 to 9 times.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. An open AIR BAG fuse would cause the "AIR BAG" warning lamp to come "ON" steady.
2. A disconnected DERM harness connector will cause the warning lamp to come "ON" steady via the shorting bar from terminal "A1" to terminal
3. This test checks for an open in the "Ignition 1" circuitry to the DERM.
4. This test checks for a short from the "SIR Indicator Low" circuit to ground.
5. This test checks for a short from the "Crank" input circuit to B+.
6. This test checks whether a short to ground caused AIR BAG fuse to open.
7. This test determines whether the short to ground is due to a malfunctioning arming sensor or a short in the wiring.