Chart A "Infl" Lamp on

CIRCUIT DESCRIPTION
When the ignition switch is first turned "On," system voltage is applied from the "IGN 1" fuse to the "WLAMPHI," Terminal "B9," and to the "Air Bag" telltale lamp which is connected to the "WLAMPLO," Terminal "A1." The "Air Bag" fuse applies system voltage to the "IGN 1" inputs, Terminals "A3" and "B3." The DERM responds by flashing the "Air Bag" telltale lamp seven times.

When the engine is being cranked, system voltage is applied from the "IGN 3" fuse to the DERM at the "Crank" input. The DERM responds by grounding the "WLAMPLO" output until system voltage is removed from the "Crank" input. This results in the "Air Bag" telltale lamp being "On" during cranking.

After cranking the DERM will again flash the "Air Bag" telltale lamp seven times.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. An open "Air Bag" Fuse would result in a loss of Ignition 1 voltage to the DERM. The DERM will respond by grounding the "WLAMPLO," Circuit 358 whenever the ignition switch is "ON."
2. A disconnected DERM harness connector will cause the telltale lamp to come On" steady by way of the shorting bar from terminal "Alto terminal "B1."
3. This test checks for a short from the "WLAMPLO" circuit to ground.
4. This test checks for an open in the "IGN 1" circuitry to the DERM.
5. This test checks for a short from the "Crank" input circuit to B+.
6. This test checks whether a short to ground caused the "Air Bag" fuse to open.
7. This test determines whether the short to ground is due to a faulty arming sensor or a short in the wiring.