Chart D Air Bag Warn Lamp Does Not Come ON Steady During Crank

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
When the ignition switch is first turned "ON," "Ignition 1" voltage is applied from the "GAUGES/AC" fuse to "Redundant Indicator Ignition 1," terminal "B2," and to the "AIR BAG" warning lamp which is connected to "SIR Indicator," terminal "B1." The "AIR BAG" fuse applies system voltage to the "Ignition 1" inputs, terminals "A9" and "A10." The DERM responds by flashing the "AIR BAG" warning lamp 7 times.

When the engine is being cranked, "Ignition 1" voltage is applied from fusible link "S" 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 6 times.

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks for a proper signal to the "Crank" input during cranking. This test also checks CKT 1879 for an open or short to ground.