Chart C Air Bag Warning Lamp Does Not Comes ON

CIRCUIT DESCRIPTION
When the ignition switch is first turned "ON," "Ignition 1" voltage is applied from the "IGN" fuse to "Redundant Indicator Ignition 1," terminal "B2," and to the "AIR BAG" warning lamp which is connected to "SIR Indicator," terminal "B1". The "SIR" fuse applies system voltage to the "Ignition 1" inputs, terminals "A9" and "A10". The DERM responds by flashing the "AIR BAG" warning lamp seven times.

When the engine is being cranked, "Ignition 1 voltage is applied from the "CRANK" fuse to the DERM at the "Crank" input. The DERM responds by grounding the "SIR" Indicator" output until "Ignition 1" voltage is removed from the "Crank" input. This results in the "AIR BAG" warning lamp being "ON" during cranking.

After cranking, the DERM will flash the "AIR BAG" warning lamp six times.

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks whether the malfunction is in the DERM circuitry or in the instrument panel cluster power feed circuitry.
2. This test confirms the integrity of the "Redundant Indicator Ignition 1" circuit.
3. This test checks for an open in the "SIR Indicator" circuit, instrument panel cluster circuitry, and "AIR BAG" warning lamp bulb.
4. This test checks whether the open is due to a bad bulb.
5. This test determines whether the malfunction is an open in the "SIR Indicator" circuit or an open m the instrument panel cluster.
6. This test determines whether the malfunction is due to a short from the "SIR Indicator" circuit to B+.
7. This test checks whether power is available to the instrument panel cluster power feed circuit.
8. This test checks for a short from the instrument panel cluster power feed circuit to ground.
9. This test determines whether the short to ground is due to a short in the wiring.
10. This test determines whether the malfunction is due to an open power feed circuit from the "IGN" fuse to the instrument panel cluster or an open power feed to the "IGN" fuse.