Part 2 of 2

Test B: Inflatable Restraint Warning Lamp Comes ON Steady (Part 2 Of 2):

Supplemental Inflatable Restraint (SIR):

OPERATION:
When the ignition switch is first turned "ON," "Ignition 1" voltage is applied from the "IGN" fuse 1D to "Redundant Indicator Ignition 1" terminal "B2" and to the "INFLATABLE RESTRAINT" warning lamp which is connected to "SIR Indicator," terminal "B1." The "AIR BAG" fuse 1C applies system voltage to the "Ignition 1" inputs, terminals "A9" and "A10." The DERM responds by flashing the "INFLATABLE RESTRAINT" warning lamp 7 times. If "Ignition 1" is outside of the normal operating voltage range, the "INFLATABLE RESTRAINT" warning lamp will come "ON" solid with no DTCs set.

When the engine is being cranked, "Ignition 1" voltage is applied from the "CRANK" fuse 1A 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 "INFLATABLE RESTRAINT" warning lamp being "ON" during cranking.

After cranking, the DERM will flash the "INFLATABLE RESTRAINT" warning lamp 6 times.

POSSIBLE CAUSES:
Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.
7. This test checks for a short from the "SIR Indicator" circuit to ground.
8. This test checks for a short from the "Crank" input circuit to B+.