Chart E Warning Lamp Does Not Come "On" Steady During Crank

Diagnosis Chart:

Electrical Chart:

DESCRIPTION
When the Ignition Switch is first turned "ON" system voltage is applied through Fuse #6 to the "SIR Indicator High" input (B9) and the "INFLATABLE RESTRAINT" warning lamp which is connected to "SIR Indicator Low" input (A1). Fuse #7 also applies system voltage to the "IGNITION 1" inputs (A3 and B3). The DERM responds by blinking the "INFLATABLE RESTRAINT" warning lamp 7 to 9 times.

When the engine is being cranked, system voltage is applied to the DERM at the "CRANK" input. The DERM grounds the warning lamp circuit until system voltage is removed from the "CRANK" input. This results in a steady "INFLATABLE RESTRAINT" warning lamp during cranking.

After cranking the DERM again blinks the "INFLATABLE RESTRAINT" warning lamp 7 to 9 times.

NOTES ON FAULT TREE
1. Checks whether the "CRANK" fuse (Fuse #1) is open due to a short to ground in the "CRANK" input circuit.
2. Checks for a possible internal DERM fault.
3. Checks for system voltage at the DERM's "CRANK" input during cranking.
4. Determines whether the missing "CRANK" signal is due to an open "CRANK" input circuit or an open power feed to the "CRANK" fuse (Fuse #1).