Chart D1 Warning Lamp Does Not Come "On"

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 if high side (power side) of the warning lamp circuit is fault free. This circuit powers the IP cluster. If the IP cluster is operative, then the power supply to the "INFLATABLE RESTRAINT" warning lamp is not suspect.
2. Checks Fuse #6 which is in the high side (power side) of the warning lamp circuit.
3. Checks for short to ground via wiring harness or DERM.
4. Checks for power supply fault.