Chart C1 Warning Lamp Comes On Steady

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. An open "AIRBAG" Fuse #7 results in a loss of "IGNITION 1" voltage at the DERM. The DERM responds by grounding the warning lamp circuit ("SIR Indicator Low") whenever the Ignition Switch is "ON."
2. When the DERM and the SIR harness connector are disconnected the shorting bar between harness connector terminals A1 and B1 ground the warning lamp circuit.
3. Checks for short to voltage in "CRANK" circuit.